restructured project to match a more standard cmake setup

src/containers/str.cpp

@@ -0,0 +1,429 @@
+#include <blah/containers/str.h>
+#include <string.h> // for strcpy etc
+#include <stdarg.h> // for format methods
+#include <stdio.h>	// for sprintf
+#include <cctype>	// toupper
+
+using namespace Blah;
+
+const uint16_t UTF8_LEAD_SURROGATE_MIN = 0xd800u;
+const uint16_t UTF8_LEAD_SURROGATE_MAX = 0xdbffu;
+const uint16_t UTF8_TRAIL_SURROGATE_MIN = 0xdc00u;
+const uint16_t UTF8_TRAIL_SURROGATE_MAX = 0xdfffu;
+const uint16_t UTF8_LEAD_OFFSET = UTF8_LEAD_SURROGATE_MIN - (0x10000 >> 10);
+const uint32_t UTF8_SURROGATE_OFFSET = 0x10000u - (UTF8_LEAD_SURROGATE_MIN << 10) - UTF8_TRAIL_SURROGATE_MIN;
+
+char Str::empty_buffer[1] = { '\0' };
+
+bool Str::operator==(const Str& rhs) const
+{
+	return strcmp(cstr(), rhs.cstr()) == 0;
+}
+
+bool Str::operator!=(const Str& rhs) const
+{
+	return strcmp(cstr(), rhs.cstr()) != 0;
+}
+
+bool Str::operator==(const char* rhs) const
+{
+	return strcmp(cstr(), rhs) == 0;
+}
+
+bool Str::operator!=(const char* rhs) const
+{
+	return strcmp(cstr(), rhs) != 0;
+}
+
+void Str::reserve(int size)
+{
+	int buffer_length = size + 1;
+	if (buffer_length > m_capacity)
+	{
+		if (m_capacity <= 0)
+			m_capacity = 16;
+
+		while (m_capacity < buffer_length)
+			m_capacity *= 2;
+
+		// expand from local buffer
+		if (m_buffer == nullptr)
+		{
+			char* local = data();
+			m_buffer = new char[m_capacity];
+			strncpy(m_buffer, local, m_local_size);
+			m_buffer[m_local_size] = '\0';
+		}
+		// expand from empty buffer
+		else if (m_buffer == empty_buffer)
+		{
+			m_buffer = new char[m_capacity];
+			m_buffer[0] = '\0';
+		}
+		// expand from existing heap buffer
+		else
+		{
+			char* new_buffer = new char[m_capacity];
+			memcpy(new_buffer, m_buffer, m_length);
+			new_buffer[m_length] = '\0';
+			delete[] m_buffer;
+			m_buffer = new_buffer;
+		}
+	}
+}
+
+void Str::set_length(int len)
+{
+	reserve(len);
+	data()[len] = '\0';
+	m_length = len;
+}
+
+Str& Str::append(char c)
+{
+	reserve(m_length + 1);
+	data()[m_length++] = c;
+	data()[m_length] = '\0';
+	return *this;
+}
+
+Str& Str::append(uint32_t c)
+{
+	// one octet
+	if (c < 0x80)
+	{
+		append((char)c);
+	}
+	// two octets
+	else if (c < 0x800)
+	{
+		append((char)((c >> 6) | 0xc0));
+		append((char)((c & 0x3f) | 0x80));
+	}
+	// three octets
+	else if (c < 0x10000)
+	{
+		append((char)((c >> 12) | 0xe0));
+		append((char)(((c >> 6) & 0x3f) | 0x80));
+		append((char)((c & 0x3f) | 0x80));
+	}
+	// four octets
+	else
+	{
+		append((char)((c >> 18) | 0xf0));
+		append((char)(((c >> 12) & 0x3f) | 0x80));
+		append((char)(((c >> 6) & 0x3f) | 0x80));
+		append((char)((c & 0x3f) | 0x80));
+	}
+
+	return *this;
+}
+
+Str& Str::append(const char* start, const char* end)
+{
+	if (end == nullptr)
+		end = start + strlen(start);
+	
+	int add = (int)(end - start);
+	if (add <= 0)
+		return *this;
+
+	reserve(m_length + add);
+	memcpy(data() + m_length, start, add);
+	m_length += add;
+	data()[m_length] = '\0';
+
+	return *this;
+}
+
+Str& Str::append(const Str& str, int start, int end)
+{
+	if (end < 0)				end = str.m_length;
+	if (end > str.m_length)		end = str.m_length;
+	if (start < 0)				start = 0;
+	if (start > end)			start = end;
+
+	return append(str.begin() + start, str.begin() + end);
+}
+
+Str& Str::append_fmt(const char* fmt, ...)
+{
+	int add, diff;
+
+	// determine arg m_length
+	va_list args;
+	va_start(args, fmt);
+	add = vsnprintf(NULL, 0, fmt, args);
+	va_end(args);
+
+	// reserve
+	reserve(m_length + add);
+	diff = m_capacity - m_length;
+	if (diff <= 0) diff = 0;
+
+	// print out
+	va_start(args, fmt);
+	vsnprintf(data() + m_length, (size_t)diff, fmt, args);
+	va_end(args);
+
+	// increment size
+	m_length += add;
+	data()[m_length] = '\0';
+
+	return *this;
+}
+
+Str& Str::append_utf16(const uint16_t* start, const uint16_t* end, bool swapEndian)
+{
+	while (start != end)
+	{
+		uint16_t next = (*start++);
+		if (swapEndian)
+			next = ((next & 0xff) << 8 | ((next & 0xff00) >> 8));
+
+		uint32_t cp = 0xffff & next;
+
+		if ((cp >= UTF8_LEAD_SURROGATE_MIN && cp <= UTF8_LEAD_SURROGATE_MAX))
+		{
+			next = (*start++);
+			if (swapEndian)
+				next = ((next & 0xff) << 8 | ((next & 0xff00) >> 8));
+
+			uint32_t trail = 0xffff & next;
+			cp = (cp << 10) + trail + UTF8_SURROGATE_OFFSET;
+		}
+
+		append(cp);
+	}
+
+	return *this;
+}
+
+Str& Str::trim()
+{
+	const char* s = begin();
+	const char* e = end() - 1;
+
+	while (isspace(*s) && s != e)
+		s++;
+	while (isspace(*e) && s != e)
+		e--;
+
+	set(s, e + 1);
+	return *this;
+}
+
+bool Str::starts_with(const char* str, bool ignoreCase) const
+{
+	int len = (int)strlen(str);
+	if (len > m_length || len <= 0)
+		return false;
+
+	const char* a = data();
+	const char* b = str;
+
+	if (ignoreCase)
+	{
+		for (int n = 0; n < len; n++)
+			if (tolower(a[n]) != tolower(b[n]))
+				return false;
+	}
+	else
+	{
+		for (int n = 0; n < len; n++)
+			if (a[n] != b[n])
+				return false;
+	}
+
+	return true;
+}
+
+bool Str::contains(const char* str, bool ignoreCase) const
+{
+	int len = (int)strlen(str);
+	if (len > m_length || len <= 0)
+		return false;
+
+	const char* a = data();
+	const char* b = str;
+
+	for (int start = 0; start < m_length - len + 1; start++)
+	{
+		bool match = true;
+
+		if (ignoreCase)
+		{
+			for (int n = 0; n < len && match; n++)
+				if (tolower(a[start + n]) != tolower(b[n]))
+					match = false;
+		}
+		else
+		{
+			for (int n = 0; n < len && match; n++)
+				if (a[start + n] != b[n])
+					match = false;
+		}
+
+		if (match)
+			return true;
+	}
+
+	return false;
+}
+
+bool Str::ends_with(const char* str, bool ignoreCase) const
+{
+	int len = (int)strlen(str);
+	if (len > m_length || len <= 0)
+		return false;
+
+	const char* a = data();
+	const char* b = str;
+
+	if (ignoreCase)
+	{
+		for (int n = m_length - len, i = 0; n < m_length; n++, i++)
+			if (tolower(a[n]) != tolower(b[i]))
+				return false;
+	}
+	else
+	{
+		for (int n = m_length - len, i = 0; n < m_length; n++, i++)
+			if (a[n] != b[i])
+				return false;
+	}
+
+	return true;
+}
+
+int Str::first_index_of(char ch) const
+{
+	const char* ptr = data();
+	for (int n = 0; n < m_length; n++)
+		if (ptr[n] == ch)
+			return n;
+	return -1;
+}
+
+int Str::last_index_of(char ch) const
+{
+	const char* ptr = data();
+	for (int n = m_length - 1; n >= 0; n--)
+		if (ptr[n] == ch)
+			return n;
+	return -1;
+}
+
+String Str::substr(int start) const
+{
+	if (start < 0) start = 0;
+	if (start > m_length) start = m_length;
+
+	return String(data() + start);
+}
+
+String Str::substr(int start, int end) const
+{
+	if (start < 0)			start = 0;
+	if (start > m_length)	start = m_length;
+	if (end < 0)			end = m_length + end;
+	if (end < start)		end = start;
+	if (end > m_length)		end = m_length;
+
+	return Str(data() + start, data() + end);
+}
+
+Vector<String> Str::split(char ch) const
+{
+	Vector<String> result;
+
+	const char* ptr = data();
+	int last = 0;
+	int index = 1;
+
+	while (index < m_length)
+	{
+		if (ptr[index] == ch)
+		{
+			result.push_back(substr(last, index));
+			last = index + 1;
+		}
+		index++;
+	}
+
+	if (last < index)
+		result.push_back(substr(last, index));
+
+	return result;
+}
+
+Str& Str::replace(const Str& os, const Str& ns)
+{
+	for (int i = 0; i < m_length - os.m_length + 1; i++)
+	{
+		if (strcmp(data() + i, os.data()) == 0)
+		{
+			if (ns.m_length > os.m_length)
+				reserve(ns.m_length - os.m_length);
+
+			memcpy(data() + i + os.m_length, data() + i + ns.m_length, m_length - i - os.m_length);
+			memcpy(data() + i, ns.cstr(), ns.m_length);
+			set_length(m_length + ns.m_length - os.m_length);
+			i += os.m_length - 1;
+		}
+	}
+
+	return *this;
+}
+
+Str& Str::replace(char c, char r)
+{
+	char* ptr = data();
+	for (int n = 0; n < m_length; n++)
+		if (ptr[n] == c)
+			ptr[n] = r;
+	return *this;
+}
+
+void Str::clear()
+{
+	if (m_capacity > 0)
+		data()[0] = '\0';
+	m_length = 0;
+}
+
+void Str::dispose()
+{
+	if (m_buffer != nullptr && m_buffer != empty_buffer)
+		delete[] m_buffer;
+
+	if (m_local_size > 0)
+	{
+		m_buffer = nullptr;
+		m_capacity = m_local_size;
+		data()[0] = '\0';
+	}
+	else
+	{
+		m_buffer = empty_buffer;
+		m_capacity = 0;
+	}
+
+	m_length = 0;
+}
+
+void Str::set(const char* start, const char* end)
+{
+	// find the end
+	if (end == nullptr)
+		end = start + strlen(start);
+
+	// reserve
+	m_length = (int)(end - start);
+	reserve(m_length);
+
+	// copy the data over
+	char* ptr = data();
+	memcpy(ptr, start, m_length);
+	ptr[m_length] = '\0';
+}

src/core/app.cpp

@@ -0,0 +1,296 @@
+#include <blah/core/app.h>
+#include <blah/core/log.h>
+#include <blah/core/time.h>
+#include <blah/math/point.h>
+#include <blah/graphics/framebuffer.h>
+#include "../internal/platform_backend.h"
+#include "../internal/graphics_backend.h"
+#include "../internal/input_backend.h"
+
+using namespace Blah;
+
+namespace
+{
+	Config app_config;
+	bool app_is_running = false;
+	bool app_is_exiting = false;
+}
+
+Config::Config()
+{
+	name = nullptr;
+	width = 0;
+	height = 0;
+	target_framerate = 60;
+	max_updates = 5;
+
+	on_startup = nullptr;
+	on_shutdown = nullptr;
+	on_update = nullptr;
+	on_render = nullptr;
+	on_exit_request = App::exit;
+	on_info = nullptr;
+	on_warn = nullptr;
+	on_error = nullptr;
+}
+
+bool App::run(const Config* c)
+{
+	BLAH_ASSERT(!app_is_running, "The Application is already running");
+	BLAH_ASSERT(c != nullptr, "The Application requires a valid Config");
+	BLAH_ASSERT(c->name != nullptr, "The Application Name cannot be null");
+	BLAH_ASSERT(c->width > 0 && c->height > 0, "The Width and Height must be larget than 0");
+	BLAH_ASSERT(c->max_updates > 0, "Max Updates must be >= 1");
+	BLAH_ASSERT(c->target_framerate > 0, "Target Framerate must be >= 1");
+
+	app_config = *c;
+	app_is_running = true;
+	app_is_exiting = false;
+
+	Log::print("Starting Up ...");
+
+	// initialize the system
+	if (!PlatformBackend::init(&app_config))
+	{
+		Log::error("Failed to initialize Platform module");
+		return false;
+	}
+
+	// initialize graphics
+	if (!GraphicsBackend::init())
+	{
+		Log::error("Failed to initialize Graphics module");
+		return false;
+	}
+
+	// input
+	InputBackend::init();
+
+	// startup
+	if (app_config.on_startup != nullptr)
+		app_config.on_startup();
+
+	uint64_t time_last = PlatformBackend::time();
+	uint64_t time_accumulator = 0;
+
+	// display window
+	PlatformBackend::ready();
+
+	while (!app_is_exiting)
+	{
+		// poll system events
+		PlatformBackend::frame();
+
+		// update at a fixed timerate
+		// TODO: allow a non-fixed step update?
+		{
+			uint64_t time_target = (uint64_t)((1.0f / app_config.target_framerate) * 1000);
+			uint64_t time_curr = PlatformBackend::time();
+			uint64_t time_diff = time_curr - time_last;
+			time_last = time_curr;
+			time_accumulator += time_diff;
+
+			// do not let us run too fast
+			while (time_accumulator < time_target)
+			{
+				PlatformBackend::sleep((int)(time_target - time_accumulator));
+
+				time_curr = PlatformBackend::time();
+				time_diff = time_curr - time_last;
+				time_last = time_curr;
+				time_accumulator += time_diff;
+			}
+
+			// Do not allow us to fall behind too many updates
+			// (otherwise we'll get spiral of death)
+			uint64_t time_maximum = app_config.max_updates * time_target;
+			if (time_accumulator > time_maximum)
+				time_accumulator = time_maximum;
+
+			// do as many updates as we can
+			while (time_accumulator >= time_target)
+			{
+				time_accumulator -= time_target;
+
+				Time::delta = (1.0f / app_config.target_framerate);
+
+				if (Time::pause_timer > 0)
+				{
+					Time::pause_timer -= Time::delta;
+					if (Time::pause_timer <= -0.0001f)
+						Time::delta = -Time::pause_timer;
+					else
+						continue;
+				}
+
+				Time::milliseconds += time_target;
+				Time::previous_elapsed = Time::elapsed;
+				Time::elapsed += Time::delta;
+
+				InputBackend::frame();
+				GraphicsBackend::frame();
+
+				if (app_config.on_update != nullptr)
+					app_config.on_update();
+			}
+		}
+
+		// render
+		{
+			GraphicsBackend::before_render();
+
+			if (app_config.on_render != nullptr)
+				app_config.on_render();
+
+			GraphicsBackend::after_render();
+			PlatformBackend::present();
+		}
+
+	}
+
+	Log::print("Shutting down ...");
+
+	// shutdown
+	if (app_config.on_shutdown != nullptr)
+		app_config.on_shutdown();
+
+	GraphicsBackend::shutdown();
+	PlatformBackend::shutdown();
+
+	// clear static state
+	Log::print("Exited");
+	app_is_running = false;
+	app_is_exiting = false;
+	Time::milliseconds = 0;
+	Time::elapsed = 0;
+	Time::delta = 0;
+
+	return true;
+}
+
+bool App::is_running()
+{
+	return app_is_running;
+}
+
+void App::exit()
+{
+	if (!app_is_exiting && app_is_running)
+		app_is_exiting = true;
+}
+
+const Config* App::config()
+{
+	return &app_config;
+}
+
+const char* App::path()
+{
+	return PlatformBackend::app_path();
+}
+
+const char* App::user_path()
+{
+	return PlatformBackend::user_path();
+}
+
+int App::width()
+{
+	int w, h;
+	PlatformBackend::get_size(&w, &h);
+	return w;
+}
+
+int App::height()
+{
+	int w, h;
+	PlatformBackend::get_size(&w, &h);
+	return h;
+}
+
+int App::draw_width()
+{
+	int w, h;
+	PlatformBackend::get_draw_size(&w, &h);
+	return w;
+}
+
+int App::draw_height()
+{
+	int w, h;
+	PlatformBackend::get_draw_size(&w, &h);
+	return h;
+}
+
+float App::content_scale()
+{
+	return PlatformBackend::get_content_scale();
+}
+
+void App::fullscreen(bool enabled)
+{
+	PlatformBackend::set_fullscreen(enabled);
+}
+
+Renderer App::renderer()
+{
+	return GraphicsBackend::renderer();
+}
+
+const RendererFeatures& Blah::App::renderer_features()
+{
+	return GraphicsBackend::features();
+}
+
+namespace
+{
+	// A dummy Frame Buffer that represents the Back Buffer
+	// it doesn't actually contain any textures or details.
+	class BackBuffer final : public FrameBuffer
+	{
+		Attachments empty_attachments;
+		TextureRef empty_texture;
+
+		virtual Attachments& attachments() override
+		{
+			BLAH_ASSERT(false, "Backbuffer doesn't have any attachments");
+			return empty_attachments;
+		}
+
+		virtual const Attachments& attachments() const override
+		{
+			BLAH_ASSERT(false, "Backbuffer doesn't have any attachments");
+			return empty_attachments;
+		}
+
+		virtual TextureRef& attachment(int index) override
+		{
+			BLAH_ASSERT(false, "Backbuffer doesn't have any attachments");
+			return empty_texture;
+		}
+
+		virtual const TextureRef& attachment(int index) const override
+		{
+			BLAH_ASSERT(false, "Backbuffer doesn't have any attachments");
+			return empty_texture;
+		}
+
+		virtual int width() const override
+		{
+			return App::draw_width();
+		}
+
+		virtual int height() const override
+		{
+			return App::draw_height();
+		}
+
+		virtual void clear(Color color) override
+		{
+			GraphicsBackend::clear_backbuffer(color);
+		}
+	};
+
+}
+
+extern const FrameBufferRef App::backbuffer = FrameBufferRef(new BackBuffer());

src/core/filesystem.cpp

@@ -0,0 +1,136 @@
+#include <blah/core/filesystem.h>
+#include "../internal/platform_backend.h"
+
+using namespace Blah;
+
+bool File::exists(const FilePath& path)
+{
+	return PlatformBackend::file_exists(path.cstr());
+}
+
+bool File::remove(const FilePath& path)
+{
+	return PlatformBackend::file_delete(path.cstr());
+}
+
+bool Directory::create(const FilePath& path)
+{
+	return PlatformBackend::dir_create(path.cstr());
+}
+
+bool Directory::exists(const FilePath& path)
+{
+	return PlatformBackend::dir_exists(path.cstr());
+}
+
+bool Directory::remove(const FilePath& path)
+{
+	return PlatformBackend::dir_delete(path.cstr());
+}
+
+Vector<FilePath> Directory::enumerate(const FilePath& path, bool recursive)
+{
+	Vector<FilePath> list;
+
+	// get files
+	PlatformBackend::dir_enumerate(list, path.cstr(), recursive);
+
+	// normalize path names
+	for (auto& it : list)
+		it.replace('\\', '/');
+
+	return list;
+}
+
+void Directory::explore(const FilePath& path)
+{
+	PlatformBackend::dir_explore(path);
+}
+
+FilePath Path::get_file_name(const FilePath& path)
+{
+	const char* cstr = path.cstr();
+	for (int n = path.length() - 2; n >= 0; n --)
+		if (*(cstr + n) == '/')
+		{
+			return FilePath(cstr + n + 1);
+		}
+
+	return path;
+}
+
+FilePath Path::get_file_name_no_ext(const FilePath& path)
+{
+	FilePath filename = get_file_name(path);
+	return get_path_no_ext(filename);
+}
+
+FilePath Path::get_path_no_ext(const FilePath& path)
+{
+	const char* cstr = path.cstr();
+	for (int n = 0; n < path.length(); n++)
+		if (*(cstr + n) == '.')
+			return FilePath(cstr, cstr + n);
+	return path;
+}
+
+FilePath Path::get_directory_name(const FilePath& path)
+{
+	FilePath directory = path;
+	while (directory.ends_with("/"))
+		directory = directory.substr(0, -1);
+	int last = directory.last_index_of('/');
+	if (last >= 0)
+		directory = directory.substr(0, last + 1);
+	return directory;
+}
+
+FilePath Path::get_path_after(const FilePath& path, const FilePath& after)
+{
+	for (int i = 0; i < path.length(); i++)
+	{
+		FilePath substr(path.begin() + i, path.end());
+		if (substr.starts_with(after, false))
+			return FilePath(path.begin() + i + after.length(), path.end());
+	}
+
+	return path;
+}
+
+FilePath Path::normalize(const FilePath& path)
+{
+	FilePath normalized;
+
+	int len = path.length();
+	for (int n = 0; n < len; n++)
+	{
+		// normalize slashes
+		if (path[n] == '\\' || path[n] == '/')
+		{
+			if (normalized.length() == 0 || normalized[normalized.length() - 1] != '/')
+				normalized.append('/');
+		}
+		// move up a directory
+		else if (path[n] == '.' && n < len - 1 && path[n + 1] == '.')
+		{
+			// search backwards for last /
+			bool couldMoveUp = false;
+			for (int k = normalized.length() - 2; k >= 0; k--)
+				if (normalized[k] == '/')
+				{
+					normalized = normalized.substr(0, k);
+					couldMoveUp = true;
+					break;
+				}
+
+			if (!couldMoveUp)
+				normalized.append('.');
+			else
+				n++;
+		}
+		else
+			normalized.append(path[n]);
+	}
+
+	return normalized;
+}

src/core/log.cpp

@@ -0,0 +1,60 @@
+#include <blah/core/log.h>
+#include <blah/core/app.h>
+#include <stdarg.h> // for logging methods
+#include <stdio.h>  // for sprintf
+
+using namespace Blah;
+
+void Log::print(const char* format, ...)
+{
+	char msg[BLAH_MESSAGE];
+	va_list ap;
+	va_start(ap, format);
+	vsnprintf(msg, sizeof(char) * BLAH_MESSAGE, format, ap);
+	va_end(ap);
+
+	if (App::is_running() && App::config()->on_info != nullptr)
+	{
+		App::config()->on_info(msg);
+	}
+	else
+	{
+		printf("%s\n", msg);
+	}
+}
+
+void Log::warn(const char* format, ...)
+{
+	char msg[BLAH_MESSAGE];
+	va_list ap;
+	va_start(ap, format);
+	vsnprintf(msg, sizeof(char) * BLAH_MESSAGE, format, ap);
+	va_end(ap);
+
+	if (App::is_running() && App::config()->on_warn != nullptr)
+	{
+		App::config()->on_warn(msg);
+	}
+	else
+	{
+		printf("\033[01;33mWARN:\033[0m\t%s\n", msg);
+	}
+}
+
+void Log::error(const char* format, ...)
+{
+	char msg[BLAH_MESSAGE];
+	va_list ap;
+	va_start(ap, format);
+	vsnprintf(msg, sizeof(char) * BLAH_MESSAGE, format, ap);
+	va_end(ap);
+
+	if (App::is_running() && App::config()->on_error != nullptr)
+	{
+		App::config()->on_error(msg);
+	}
+	else
+	{
+		printf("\033[1;31mERROR:\033[0m\t%s\n", msg);
+	}
+}

src/core/time.cpp

@@ -0,0 +1,54 @@
+#include <blah/core/time.h>
+#include <math.h>
+
+using namespace Blah;
+
+namespace
+{
+	float modf(float x, float m)
+	{
+		return x - (int)(x / m) * m;
+	}
+}
+
+uint64_t Time::milliseconds = 0;
+float Time::elapsed = 0;
+float Time::delta = 0;
+float Time::previous_elapsed = 0;
+float Time::pause_timer = 0;
+
+void Time::pause_for(float time)
+{
+	if (time >= pause_timer)
+		pause_timer = time;
+}
+
+bool Time::on_interval(float time, float delta, float interval, float offset)
+{
+	return floor((time - offset - delta) / interval) < floor((time - offset) / interval);
+}
+
+bool Time::on_interval(float delta, float interval, float offset)
+{
+	return Time::on_interval(Time::elapsed, delta, interval, offset);
+}
+
+bool Time::on_interval(float interval, float offset)
+{
+	return Time::on_interval(Time::elapsed, Time::delta, interval, offset);
+}
+
+bool Time::on_time(float time, float timestamp)
+{
+	return time >= timestamp && time - Time::delta < timestamp;
+}
+
+bool Time::between_interval(float time, float interval, float offset)
+{
+	return modf(time - offset, interval * 2) >= interval;
+}
+
+bool Time::between_interval(float interval, float offset)
+{
+	return between_interval(Time::elapsed, interval, offset);
+}

src/drawing/spritefont.cpp

@@ -0,0 +1,258 @@
+#include <blah/drawing/spritefont.h>
+#include <blah/images/font.h>
+#include <blah/images/packer.h>
+#include <blah/core/log.h>
+
+using namespace Blah;
+
+SpriteFont::SpriteFont()
+{
+	size = 0;
+	ascent = 0;
+	descent = 0;
+	line_gap = 0;
+}
+
+const uint32_t ascii[]{ 32, 128, 0 };
+const uint32_t* SpriteFont::ASCII = ascii;
+
+SpriteFont::SpriteFont(const char* file, float size)
+{
+	build(file, size, ASCII);
+}
+
+SpriteFont::SpriteFont(const char* file, float size, const uint32_t* charset)
+{
+	build(file, size, charset);
+}
+
+SpriteFont::SpriteFont(const Font& font, float size)
+{
+	build(font, size, ASCII);
+}
+
+SpriteFont::SpriteFont(const Font& font, float size, const uint32_t* charset)
+{
+	build(font, size, charset);
+}
+
+SpriteFont::SpriteFont(SpriteFont&& src) noexcept
+{
+	name = src.name;
+	size = src.size;
+	ascent = src.ascent;
+	descent = src.descent;
+	line_gap = src.line_gap;
+	m_characters = std::move(src.m_characters);
+	m_kerning = std::move(src.m_kerning);
+	m_atlas = std::move(src.m_atlas);
+}
+
+SpriteFont::~SpriteFont()
+{
+	dispose();
+}
+
+void SpriteFont::dispose()
+{
+	m_atlas.clear();
+	m_characters.clear();
+	m_kerning.clear();
+	name.dispose();
+}
+
+SpriteFont& SpriteFont::operator=(SpriteFont && src) noexcept
+{
+	name = src.name;
+	size = src.size;
+	ascent = src.ascent;
+	descent = src.descent;
+	line_gap = src.line_gap;
+	m_characters = std::move(src.m_characters);
+	m_kerning = std::move(src.m_kerning);
+	m_atlas = std::move(src.m_atlas);
+	return *this;
+}
+
+float SpriteFont::width_of(const String& text) const
+{
+	float width = 0;
+	float lineWidth = 0;
+	for (auto it = text.begin(); it != text.end(); it++)
+	{
+		if (*it == '\n')
+			lineWidth = 0;
+
+		// TODO: this doesn't account for Unicode values!
+		uint32_t codepoint = *it;
+
+		lineWidth += this->operator[](codepoint).advance;
+		if (lineWidth > width)
+			width = lineWidth;
+	}
+
+	return width;
+}
+
+float SpriteFont::width_of_line(const String& text, int start) const
+{
+	if (start < 0) return 0;
+	if (start >= text.length()) return 0;
+
+	float lineWidth = 0;
+	for (auto it = text.begin() + start; it != text.end(); it++)
+	{
+		if (*it == '\n')
+			return lineWidth;
+
+		// TODO: this doesn't account for Unicode values!
+		uint32_t codepoint = *it;
+
+		lineWidth += this->operator[](codepoint).advance;
+	}
+
+	return lineWidth;
+}
+
+float SpriteFont::height_of(const String& text) const
+{
+	if (text.length() <= 0)
+		return 0;
+
+	float height = line_height();
+	for (auto it = text.begin(); it != text.end(); it++)
+	{
+		if (*it == '\n')
+			height += line_height();
+	}
+
+	return height - line_gap;
+}
+
+void SpriteFont::build(const char* file, float sz, const uint32_t* charset)
+{
+	dispose();
+
+	Font font(file);
+	if (font.is_valid())
+		build(font, sz, charset);
+}
+
+void SpriteFont::build(const Font& font, float size, const uint32_t* charset)
+{
+	dispose();
+
+	float scale = font.get_scale(size);
+
+	name = font.family_name();
+	ascent = font.ascent() * scale;
+	descent = font.descent() * scale;
+	line_gap = font.line_gap() * scale;
+	this->size = size;
+
+	Packer packer;
+	packer.spacing = 0;
+	packer.padding = 1;
+	packer.max_size = 8192;
+	packer.power_of_two = true;
+	
+	std::unordered_map<uint32_t, int> glyphs;
+	Vector<Color> buffer;
+
+	auto ranges = charset;
+	while (*ranges != 0)
+	{
+		auto from = *ranges;
+		auto to = *(ranges + 1);
+
+		BLAH_ASSERT(to >= from, "Charset Range must be in pairs of [min,max]");
+
+		for (auto i = from; i < to; i++)
+		{
+			auto glyph = font.get_glyph(i);
+			if (glyph <= 0)
+				continue;
+
+			glyphs[i] = glyph;
+
+			// add character
+			Font::Char ch = font.get_character(glyph, scale);
+			m_characters[i].advance = ch.advance;
+			m_characters[i].offset = Vec2(ch.offset_x, ch.offset_y);
+
+			// pack glyph
+			if (ch.has_glyph)
+			{
+				if (buffer.size() < ch.width * ch.height)
+					buffer.resize(ch.width * ch.height);
+
+				if (font.get_image(ch, buffer.data()))
+					packer.add(i, ch.width, ch.height, buffer.data());
+			}
+		}
+
+		ranges += 2;
+	}
+
+	buffer.clear();
+	packer.pack();
+
+	for (auto& it : packer.pages)
+		m_atlas.push_back(Texture::create(it));
+
+	// add character subtextures
+	for (auto& it : packer.entries)
+		if (!it.empty)
+			m_characters[(uint32_t)it.id].subtexture = Subtexture(m_atlas[it.page], it.packed, it.frame);
+
+	// add kerning
+	for (auto a = glyphs.begin(); a != glyphs.end(); a++)
+		for (auto b = glyphs.begin(); b != glyphs.end(); b++)
+		{
+			auto kern = font.get_kerning(a->second, b->second, scale);
+			if (kern != 0)
+				set_kerning(a->first, b->first, kern);
+		}
+}
+
+float SpriteFont::get_kerning(uint32_t codepoint0, uint32_t codepoint1) const
+{
+	uint64_t index = ((uint64_t)codepoint0 << 32) | codepoint1;
+
+	auto it = m_kerning.find(index);
+	if (it != m_kerning.end())
+		return it->second;
+	return 0.0f;
+}
+
+void SpriteFont::set_kerning(uint32_t codepoint0, uint32_t codepoint1, float value)
+{
+	uint64_t index = ((uint64_t)codepoint0 << 32) | codepoint1;
+
+	if (value == 0)
+	{
+		m_kerning.erase(index);
+	}
+	else
+	{
+		m_kerning[index] = value;
+	}
+}
+
+const SpriteFont::Character& SpriteFont::get_character(uint32_t codepoint) const
+{
+	static const Character empty;
+	auto it = m_characters.find(codepoint);
+	if (it != m_characters.end())
+		return it->second;
+	return empty;
+}
+
+const SpriteFont::Character& SpriteFont::operator[](uint32_t codepoint) const
+{
+	static const Character empty;
+	auto it = m_characters.find(codepoint);
+	if (it != m_characters.end())
+		return it->second;
+	return empty;
+}

src/drawing/subtexture.cpp

@@ -0,0 +1,64 @@
+#include <blah/drawing/subtexture.h>
+#include <blah/math/calc.h>
+
+using namespace Blah;
+
+Subtexture::Subtexture() {}
+
+Subtexture::Subtexture(const TextureRef& texture)
+	: Subtexture(texture, Rect(0, 0, (float)texture->width(), (float)texture->height())) {}
+
+Subtexture::Subtexture(const TextureRef& texture, Rect source)
+	: Subtexture(texture, source, Rect(0, 0, source.w, source.h)) {}
+
+Subtexture::Subtexture(const TextureRef& texture, Rect source, Rect frame)
+	: texture(texture), source(source), frame(frame)
+{
+	update();
+}
+
+void Subtexture::update()
+{
+	draw_coords[0].x = -frame.x;
+	draw_coords[0].y = -frame.y;
+	draw_coords[1].x = -frame.x + source.w;
+	draw_coords[1].y = -frame.y;
+	draw_coords[2].x = -frame.x + source.w;
+	draw_coords[2].y = -frame.y + source.h;
+	draw_coords[3].x = -frame.x;
+	draw_coords[3].y = -frame.y + source.h;
+
+	if (texture)
+	{
+		float uvx = 1.0f / (float)texture->width();
+		float uvy = 1.0f / (float)texture->height();
+
+		tex_coords[0].x = source.x * uvx;
+		tex_coords[0].y = source.y * uvy;
+		tex_coords[1].x = (source.x + source.w ) * uvx;
+		tex_coords[1].y = source.y * uvy;
+		tex_coords[2].x = (source.x + source.w) * uvx;
+		tex_coords[2].y = (source.y + source.h) * uvy;
+		tex_coords[3].x = source.x * uvx;
+		tex_coords[3].y = (source.y + source.h) * uvy;
+	}
+}
+
+void Subtexture::crop_info(const Rect& clip, Rect* dest_source, Rect* dest_frame) const
+{
+	*dest_source = (clip + source.top_left() + frame.top_left()).overlap_rect(source);
+
+	dest_frame->x = Calc::min(0.0f, frame.x + clip.x);
+	dest_frame->y = Calc::min(0.0f, frame.y + clip.y);
+	dest_frame->w = clip.w;
+	dest_frame->h = clip.h;
+}
+
+Subtexture Subtexture::crop(const Rect& clip) const
+{
+	Subtexture dst;
+	dst.texture = texture;
+	crop_info(clip, &dst.source, &dst.frame);
+	dst.update();
+	return dst;
+}

src/graphics/blend.cpp

@@ -0,0 +1,25 @@
+#include <blah/graphics/blend.h>
+
+using namespace Blah;
+
+const BlendMode BlendMode::Normal = BlendMode(
+	BlendOp::Add,
+	BlendFactor::One,
+	BlendFactor::OneMinusSrcAlpha,
+	BlendOp::Add,
+	BlendFactor::One,
+	BlendFactor::OneMinusSrcAlpha,
+	BlendMask::RGBA,
+	0xffffffff
+);
+
+const BlendMode BlendMode::Subtract = BlendMode(
+	BlendOp::ReverseSubtract,
+	BlendFactor::One,
+	BlendFactor::One,
+	BlendOp::Add,
+	BlendFactor::One,
+	BlendFactor::One,
+	BlendMask::RGBA,
+	0xffffffff
+);

src/graphics/framebuffer.cpp

@@ -0,0 +1,35 @@
+#include <blah/graphics/framebuffer.h>
+#include "../internal/graphics_backend.h"
+
+using namespace Blah;
+
+FrameBufferRef FrameBuffer::create(int width, int height)
+{
+	static const TextureFormat attachment = TextureFormat::RGBA;
+	return create(width, height, &attachment, 1);
+}
+
+FrameBufferRef FrameBuffer::create(int width, int height, const TextureFormat* attachments, int attachment_count)
+{
+	BLAH_ASSERT(width > 0 && height > 0, "FrameBuffer width and height must be larger than 0");
+	BLAH_ASSERT(attachment_count <= BLAH_ATTACHMENTS, "Exceeded maximum attachment count");
+	BLAH_ASSERT(attachment_count > 0, "At least one attachment must be provided");
+
+	int color_count = 0;
+	int depth_count = 0;
+
+	for (int i = 0; i < attachment_count; i++)
+	{
+		BLAH_ASSERT((int)attachments[i] > (int)TextureFormat::None && (int)attachments[i] < (int)TextureFormat::Count, "Invalid texture format");
+
+		if (attachments[i] == TextureFormat::DepthStencil)
+			depth_count++;
+		else
+			color_count++;
+	}
+
+	BLAH_ASSERT(depth_count <= 1, "FrameBuffer can only have 1 Depth/Stencil Texture");
+	BLAH_ASSERT(color_count <= BLAH_ATTACHMENTS - 1, "Exceeded maximum Color attachment count");
+
+	return GraphicsBackend::create_framebuffer(width, height, attachments, attachment_count);
+}

src/graphics/material.cpp

@@ -0,0 +1,355 @@
+#include <blah/graphics/material.h>
+#include <blah/core/log.h>
+
+using namespace Blah;
+
+namespace
+{
+	int calc_uniform_size(const UniformInfo& uniform)
+	{
+		int components = 0;
+
+		switch (uniform.type)
+		{
+		case UniformType::Float: components = 1; break;
+		case UniformType::Float2: components = 2; break;
+		case UniformType::Float3: components = 3; break;
+		case UniformType::Float4: components = 4; break;
+		case UniformType::Mat3x2: components = 6; break;
+		case UniformType::Mat4x4: components = 16; break;
+		default:
+			BLAH_ERROR("Unespected Uniform Type");
+			break;
+		}
+
+		return components * uniform.array_length;
+	}
+}
+
+MaterialRef Material::create(const ShaderRef& shader)
+{
+	BLAH_ASSERT(shader, "The provided shader is invalid");
+
+	if (shader)
+		return MaterialRef(new Material(shader));
+
+	return MaterialRef();
+}
+
+Material::Material(const ShaderRef& shader)
+{
+	BLAH_ASSERT(shader, "Material is being created with an invalid shader");
+	m_shader = shader;
+
+	auto& uniforms = shader->uniforms();
+	int float_size = 0;
+
+	for (auto& uniform : uniforms)
+	{
+		if (uniform.type == UniformType::None)
+			continue;
+
+		if (uniform.type == UniformType::Texture2D)
+		{
+			for (int i = 0; i < uniform.array_length; i ++)
+				m_textures.push_back(TextureRef());
+			continue;
+		}
+
+		if (uniform.type == UniformType::Sampler2D)
+		{
+			for (int i = 0; i < uniform.array_length; i++)
+				m_samplers.push_back(TextureSampler());
+			continue;
+		}
+
+		float_size += calc_uniform_size(uniform);
+	}
+
+	m_data.expand(float_size);
+}
+
+const ShaderRef Material::shader() const
+{
+	return m_shader;
+}
+
+void Material::set_texture(const char* name, const TextureRef& texture, int index)
+{
+	BLAH_ASSERT(m_shader, "Material Shader is invalid");
+
+	int offset = 0;
+	for (auto& uniform : m_shader->uniforms())
+	{
+		if (uniform.type != UniformType::Texture2D)
+			continue;
+
+		if (strcmp(uniform.name, name) == 0)
+		{
+			m_textures[offset + index] = texture;
+			return;
+		}
+
+		offset += uniform.array_length;
+		if (offset + index >= m_textures.size())
+			break;
+	}
+
+	Log::warn("No Texture Uniform '%s' at index [%i] exists", name, index);
+}
+
+void Material::set_texture(int slot, const TextureRef& texture, int index)
+{
+	BLAH_ASSERT(m_shader, "Material Shader is invalid");
+
+	int s = 0;
+	int offset = 0;
+	for (auto& uniform : m_shader->uniforms())
+	{
+		if (uniform.type != UniformType::Texture2D)
+			continue;
+
+		if (s == slot)
+		{
+			if (index > uniform.array_length)
+				break;
+
+			m_textures[offset + index] = texture;
+			break;
+		}
+
+		offset += uniform.array_length;
+		s++;
+	}
+}
+
+TextureRef Material::get_texture(const char* name, int index) const
+{
+	BLAH_ASSERT(m_shader, "Material Shader is invalid");
+
+	int offset = 0;
+	for (auto& uniform : m_shader->uniforms())
+	{
+		if (uniform.type != UniformType::Texture2D)
+			continue;
+
+		if (strcmp(uniform.name, name) == 0)
+			return m_textures[offset + index];
+
+		offset += uniform.array_length;
+		if (offset + index >= m_textures.size())
+			break;
+	}
+
+	Log::warn("No Texture Uniform '%s' at index [%i] exists", name, index);
+	return TextureRef();
+}
+
+TextureRef Material::get_texture(int slot, int index) const
+{
+	BLAH_ASSERT(m_shader, "Material Shader is invalid");
+
+	int s = 0;
+	int offset = 0;
+	for (auto& uniform : m_shader->uniforms())
+	{
+		if (uniform.type != UniformType::Texture2D)
+			continue;
+
+		if (s == slot)
+		{
+			if (index > uniform.array_length)
+				break;
+
+			return m_textures[offset + index];
+		}
+
+		offset += uniform.array_length;
+		if (offset + index >= m_textures.size())
+			break;
+
+		s++;
+	}
+
+	Log::warn("No Texture Uniform ['%i'] at index [%i] exists", slot, index);
+	return TextureRef();
+}
+
+void Material::set_sampler(const char* name, const TextureSampler& sampler, int index)
+{
+	BLAH_ASSERT(m_shader, "Material Shader is invalid");
+
+	int offset = 0;
+	for (auto& uniform : m_shader->uniforms())
+	{
+		if (uniform.type != UniformType::Sampler2D)
+			continue;
+
+		if (strcmp(uniform.name, name) == 0)
+		{
+			m_samplers[offset + index] = sampler;
+			return;
+		}
+
+		offset += uniform.array_length;
+		if (offset + index >= m_samplers.size())
+			break;
+	}
+
+	Log::warn("No Sampler Uniform '%s' at index [%i] exists", name, index);
+}
+
+void Material::set_sampler(int slot, const TextureSampler& sampler, int index)
+{
+	BLAH_ASSERT(m_shader, "Material Shader is invalid");
+
+	int s = 0;
+	int offset = 0;
+	for (auto& uniform : m_shader->uniforms())
+	{
+		if (uniform.type != UniformType::Sampler2D)
+			continue;
+
+		if (s == slot)
+		{
+			if (index > uniform.array_length)
+				break;
+
+			m_samplers[offset + index] = sampler;
+			break;
+		}
+
+		offset += uniform.array_length;
+		s++;
+	}
+}
+
+TextureSampler Material::get_sampler(const char* name, int index) const
+{
+	BLAH_ASSERT(m_shader, "Material Shader is invalid");
+
+	int offset = 0;
+	for (auto& uniform : m_shader->uniforms())
+	{
+		if (uniform.type != UniformType::Sampler2D)
+			continue;
+
+		if (strcmp(uniform.name, name) == 0)
+			return m_samplers[offset + index];
+
+		offset += uniform.array_length;
+		if (offset + index >= m_samplers.size())
+			break;
+	}
+
+	Log::warn("No Sampler Uniform '%s' at index [%i] exists", name, index);
+	return TextureSampler();
+}
+
+TextureSampler Material::get_sampler(int slot, int index) const
+{
+	BLAH_ASSERT(m_shader, "Material Shader is invalid");
+
+	int s = 0;
+	int offset = 0;
+	for (auto& uniform : m_shader->uniforms())
+	{
+		if (uniform.type != UniformType::Sampler2D)
+			continue;
+
+		if (s == slot)
+		{
+			if (index > uniform.array_length)
+				break;
+
+			return m_samplers[offset + index];
+		}
+
+		offset += uniform.array_length;
+		if (offset + index >= m_samplers.size())
+			break;
+
+		s++;
+	}
+
+	Log::warn("No Sampler Uniform ['%i'] at index [%i] exists", slot, index);
+	return TextureSampler();
+}
+
+void Material::set_value(const char* name, const float* value, int64_t length)
+{
+	BLAH_ASSERT(m_shader, "Material Shader is invalid");
+	BLAH_ASSERT(length >= 0, "Length must be >= 0");
+
+	int index = 0;
+	int offset = 0;
+	for (auto& uniform : m_shader->uniforms())
+	{
+		if (uniform.type == UniformType::Texture2D ||
+			uniform.type == UniformType::Sampler2D ||
+			uniform.type == UniformType::None)
+			continue;
+
+		if (strcmp(uniform.name, name) == 0)
+		{
+			auto max = calc_uniform_size(uniform);
+			if (length > max)
+			{
+				Log::warn("Exceeding length of Uniform '%s' (%i / %i)", name, length, max);
+				length = max;
+			}
+
+			memcpy(m_data.begin() + offset, value, sizeof(float) * length);
+			return;
+		}
+
+		offset += calc_uniform_size(uniform);
+		index++;
+	}
+
+	Log::warn("No Uniform '%s' exists", name);
+}
+
+const float* Material::get_value(const char* name, int64_t* length) const
+{
+	BLAH_ASSERT(m_shader, "Material Shader is invalid");
+
+	int index = 0;
+	int offset = 0;
+	for (auto& uniform : m_shader->uniforms())
+	{
+		if (uniform.type == UniformType::Texture2D ||
+			uniform.type == UniformType::Sampler2D ||
+			uniform.type == UniformType::None)
+			continue;
+
+		if (strcmp(uniform.name, name) == 0)
+		{
+			if (length != nullptr)
+				*length = calc_uniform_size(uniform);
+			return m_data.begin() + offset;
+		}
+
+		index++;
+		offset += calc_uniform_size(uniform);
+	}
+
+	*length = 0;
+	return nullptr;
+	Log::warn("No Uniform '%s' exists", name);
+}
+
+const Vector<TextureRef>& Material::textures() const
+{
+	return m_textures;
+}
+
+const Vector<TextureSampler>& Material::samplers() const
+{
+	return m_samplers;
+}
+
+const float* Material::data() const
+{
+	return m_data.begin();
+}

src/graphics/mesh.cpp

@@ -0,0 +1,40 @@
+#include <blah/graphics/mesh.h>
+#include "../internal/graphics_backend.h"
+
+using namespace Blah;
+
+
+MeshRef Mesh::create()
+{
+	return GraphicsBackend::create_mesh();
+}
+
+VertexFormat::VertexFormat(std::initializer_list<VertexAttribute> attributes, int stride)
+{
+	for (auto& it : attributes)
+		this->attributes.push_back(it);
+
+	if (stride <= 0)
+	{
+		stride = 0;
+
+		for (auto& it : attributes)
+		{
+			switch (it.type)
+			{
+			case VertexType::Float: stride += 4; break;
+			case VertexType::Float2: stride += 8; break;
+			case VertexType::Float3: stride += 12; break;
+			case VertexType::Float4: stride += 16; break;
+			case VertexType::Byte4: stride += 4; break;
+			case VertexType::UByte4: stride += 4; break;
+			case VertexType::Short2: stride += 4; break;
+			case VertexType::UShort2: stride += 4; break;
+			case VertexType::Short4: stride += 8; break;
+			case VertexType::UShort4: stride += 8; break;
+			}
+		}
+	}
+
+	this->stride = stride;
+}

src/graphics/renderpass.cpp

@@ -0,0 +1,94 @@
+#include <blah/graphics/renderpass.h>
+#include <blah/core/log.h>
+#include "../internal/graphics_backend.h"
+
+using namespace Blah;
+
+RenderPass::RenderPass()
+{
+	blend = BlendMode::Normal;
+	target = App::backbuffer;
+	mesh = MeshRef();
+	material = MaterialRef();
+	has_viewport = false;
+	has_scissor = false;
+	viewport = Rect();
+	scissor = Rect();
+	index_start = 0;
+	index_count = 0;
+	instance_count = 0;
+	depth = Compare::None;
+	cull = Cull::None;
+}
+
+void RenderPass::perform()
+{
+	BLAH_ASSERT(material, "Trying to draw with an invalid Material");
+	BLAH_ASSERT(material->shader(), "Trying to draw with an invalid Shader");
+	BLAH_ASSERT(mesh, "Trying to draw with an invalid Mesh");
+
+	// copy call
+	RenderPass pass = *this;
+
+	// Validate Backbuffer
+	if (!pass.target)
+	{
+		pass.target = App::backbuffer;
+		Log::warn("Trying to draw with an invalid Target; falling back to Back Buffer");
+	}
+
+	// Validate Index Count
+	int64_t index_count = pass.mesh->index_count();
+	if (pass.index_start + pass.index_count > index_count)
+	{
+		Log::warn(
+			"Trying to draw more indices than exist in the index buffer (%i-%i / %i); trimming extra indices",
+			pass.index_start,
+			pass.index_start + pass.index_count,
+			index_count);
+
+		if (pass.index_start > pass.index_count)
+			return;
+
+		pass.index_count = pass.index_count - pass.index_start;
+	}
+
+	// Validate Instance Count
+	int64_t instance_count = pass.mesh->instance_count();
+	if (pass.instance_count > instance_count)
+	{
+		Log::warn(
+			"Trying to draw more instances than exist in the index buffer (%i / %i); trimming extra instances",
+			pass.instance_count,
+			instance_count);
+
+		pass.instance_count = instance_count;
+	}
+
+	// get the total drawable size
+	Vec2 draw_size;
+	if (!pass.target)
+		draw_size = Vec2(App::draw_width(), App::draw_height());
+	else
+		draw_size = Vec2(pass.target->width(), pass.target->height());
+
+	// Validate Viewport
+	if (!pass.has_viewport)
+	{
+		pass.viewport.x = 0;
+		pass.viewport.y = 0;
+		pass.viewport.w = draw_size.x;
+		pass.viewport.h = draw_size.y;
+	}
+	else
+	{
+		pass.viewport = pass.viewport.overlap_rect(Rect(0, 0, draw_size.x, draw_size.y));
+	}
+
+	// Validate Scissor
+	if (pass.has_scissor)
+		pass.scissor = pass.scissor.overlap_rect(Rect(0, 0, draw_size.x, draw_size.y));
+
+	// perform render
+	GraphicsBackend::render(pass);
+}

src/graphics/shader.cpp

@@ -0,0 +1,39 @@
+#include <blah/graphics/shader.h>
+#include <blah/core/app.h>
+#include "../internal/graphics_backend.h"
+
+using namespace Blah;
+
+ShaderRef Shader::create(const ShaderData& data)
+{
+	BLAH_ASSERT(data.vertex.length() > 0, "Must provide a Vertex Shader");
+	BLAH_ASSERT(data.fragment.length() > 0, "Must provide a Fragment Shader");
+	BLAH_ASSERT(data.hlsl_attributes.size() > 0 || App::renderer() != Renderer::D3D11, "D3D11 Shaders must have hlsl_attributes assigned");
+
+	auto shader = GraphicsBackend::create_shader(&data);
+	
+	// validate the shader
+	if (shader)
+	{
+		auto& uniforms = shader->uniforms();
+
+		// make sure its uniforms are valid
+		for (auto& it : uniforms)
+			if (it.type == UniformType::None)
+			{
+				BLAH_ERROR_FMT("Uniform '%s' has an invalid type!\n\tOnly Float/Float2/Float3/Float4/Mat3x2/Mat4x4/Texture are allowed!", it.name.cstr());
+				return ShaderRef();
+			}
+
+		// make sure uniform names don't overlap
+		for (int i = 0; i < uniforms.size(); i ++)
+			for (int j = i + 1; j < uniforms.size(); j ++)
+				if (uniforms[i].name == uniforms[j].name)
+				{
+					BLAH_ERROR_FMT("Shader Uniform names '%s' overlap! All Names must be unique.", uniforms[0].name.cstr());
+					return ShaderRef();
+				}
+	}
+
+	return shader;
+}

src/graphics/texture.cpp

@@ -0,0 +1,61 @@
+#include <blah/graphics/texture.h>
+#include <blah/images/image.h>
+#include <blah/streams/stream.h>
+#include <blah/core/log.h>
+#include "../internal/graphics_backend.h"
+
+using namespace Blah;
+
+TextureRef Texture::create(const Image& image)
+{
+	auto tex = create(image.width, image.height, TextureFormat::RGBA);
+	if (tex)
+		tex->set_data((unsigned char*)image.pixels);
+	return tex;
+}
+
+TextureRef Texture::create(int width, int height, unsigned char* rgba)
+{
+	auto tex = create(width, height, TextureFormat::RGBA);
+	if (tex)
+		tex->set_data(rgba);
+	return tex;
+}
+
+TextureRef Texture::create(int width, int height, TextureFormat format)
+{
+	BLAH_ASSERT(width > 0 && height > 0, "Texture width and height must be larger than 0");
+	BLAH_ASSERT((int)format > (int)TextureFormat::None && (int)format < (int)TextureFormat::Count, "Invalid texture format");
+
+	return GraphicsBackend::create_texture(width, height, format);
+}
+
+TextureRef Texture::create(Stream& stream)
+{
+	Image img = Image(stream);
+
+	if (img.pixels && img.width > 0 && img.height > 0)
+	{
+		auto tex = create(img.width, img.height, TextureFormat::RGBA);
+		if (tex)
+			tex->set_data((unsigned char*)img.pixels);
+		return tex;
+	}
+
+	return TextureRef();
+}
+
+TextureRef Texture::create(const char* file)
+{
+	Image img = Image(file);
+
+	if (img.pixels)
+	{
+		auto tex = create(img.width, img.height, TextureFormat::RGBA);
+		if (tex)
+			tex->set_data((unsigned char*)img.pixels);
+		return tex;
+	}
+
+	return TextureRef();
+}

src/images/aseprite.cpp

@@ -0,0 +1,471 @@
+#include <blah/images/aseprite.h>
+#include <blah/streams/filestream.h>
+#include <blah/core/filesystem.h>
+#include <blah/core/log.h>
+
+#define STBI_NO_STDIO
+#define STBI_ONLY_ZLIB
+#include "../third_party/stb_image.h"
+
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#define MUL_UN8(a, b, t) \
+	((t) = (a) * (uint16_t)(b) + 0x80, ((((t) >> 8) + (t) ) >> 8))
+
+using namespace Blah;
+
+Aseprite::Aseprite()
+{
+
+}
+
+Aseprite::Aseprite(const char* path)
+{
+	FileStream fs(path, FileMode::Read);
+	parse(fs);
+}
+
+Aseprite::Aseprite(Stream& stream)
+{
+	parse(stream);
+}
+
+Aseprite::Aseprite(const Aseprite& src)
+{
+	mode = src.mode;
+	width = src.width;
+	height = src.height;
+	layers = src.layers;
+	frames = src.frames;
+	tags = src.tags;
+	slices = src.slices;
+	palette = src.palette;
+}
+
+Aseprite::Aseprite(Aseprite&& src) noexcept
+{
+	mode = src.mode;
+	width = src.width;
+	height = src.height;
+	layers = std::move(src.layers);
+	frames = std::move(src.frames);
+	tags = std::move(src.tags);
+	slices = std::move(src.slices);
+	palette = std::move(src.palette);
+}
+
+Aseprite& Aseprite::operator=(const Aseprite& src)
+{
+	mode = src.mode;
+	width = src.width;
+	height = src.height;
+	layers = src.layers;
+	frames = src.frames;
+	tags = src.tags;
+	slices = src.slices;
+	palette = src.palette;
+	return *this;
+}
+
+Aseprite& Aseprite::operator=(Aseprite&& src) noexcept
+{
+	mode = src.mode;
+	width = src.width;
+	height = src.height;
+	layers = std::move(src.layers);
+	frames = std::move(src.frames);
+	tags = std::move(src.tags);
+	slices = std::move(src.slices);
+	palette = std::move(src.palette);
+	return *this;
+}
+
+Aseprite::~Aseprite()
+{
+
+}
+
+void Aseprite::parse(Stream& stream)
+{
+	if (!stream.is_readable())
+	{
+		BLAH_ERROR("Stream is not readable");
+		return;
+	}
+
+	int frame_count = 0;
+
+	// header
+	{
+		// filesize
+		stream.read<uint32_t>(Endian::Little);
+
+		// magic number
+		auto magic = stream.read<uint16_t>(Endian::Little);
+		if (magic != 0xA5E0)
+		{
+			BLAH_ERROR("File is not a valid Aseprite file");
+			return;
+		}
+
+		// main info
+		frame_count = stream.read<uint16_t>(Endian::Little);
+		width = stream.read<uint16_t>(Endian::Little);
+		height = stream.read<uint16_t>(Endian::Little);
+		mode = static_cast<Aseprite::Modes>(stream.read<uint16_t>(Endian::Little) / 8);
+
+		// don't care about other info
+		stream.read<uint32_t>(Endian::Little);		// Flags
+		stream.read<uint16_t>(Endian::Little);		// Speed (deprecated)
+		stream.read<uint32_t>(Endian::Little);		// Should be 0
+		stream.read<uint32_t>(Endian::Little);		// Should be 0
+		stream.read<uint8_t>(Endian::Little);		// Palette entry
+		stream.seek(stream.position() + 3);			// Ignore these bytes
+		stream.read<uint16_t>(Endian::Little);		// Number of colors (0 means 256 for old sprites)
+		stream.read<int8_t>(Endian::Little);		// Pixel width
+		stream.read<int8_t>(Endian::Little);		// Pixel height
+		stream.seek(stream.position() + 92);		// For Future
+	}
+
+	frames.resize(frame_count);
+
+	// frames
+	for (int i = 0; i < frame_count; i++)
+	{
+		auto frameStart = stream.position();
+		auto frameEnd = frameStart + stream.read<uint32_t>(Endian::Little);
+		unsigned int chunks = 0;
+
+		// frame header
+		{
+			auto magic = stream.read<uint16_t>(Endian::Little); // magic number
+			if (magic != 0xF1FA)
+			{
+				BLAH_ERROR("File is not a valid Aseprite file");
+				return;
+			}
+
+			auto old_chunk_count = stream.read<uint16_t>(Endian::Little);
+			frames[i].duration = stream.read<uint16_t>(Endian::Little);
+			stream.seek(stream.position() + 2); // for future
+			auto new_chunk_count = stream.read<uint32_t>(Endian::Little);
+
+			if (old_chunk_count == 0xFFFF)
+				chunks = new_chunk_count;
+			else
+				chunks = old_chunk_count;
+		}
+
+		// make frame image
+		frames[i].image = Image(width, height);
+
+		// frame chunks
+		for (unsigned int j = 0; j < chunks; j++)
+		{
+			auto chunkStart = stream.position();
+			auto chunkEnd = chunkStart + stream.read<uint32_t>(Endian::Little);
+			auto chunkType = static_cast<Chunks>(stream.read<uint16_t>(Endian::Little));
+
+			switch (chunkType)
+			{
+			case Chunks::Layer: parse_layer(stream, i); break;
+			case Chunks::Cel: parse_cel(stream, i, chunkEnd); break;
+			case Chunks::Palette: parse_palette(stream, i); break;
+			case Chunks::UserData: parse_user_data(stream, i); break;
+			case Chunks::FrameTags: parse_tag(stream, i); break;
+			case Chunks::Slice: parse_slice(stream, i); break;
+			default: break;
+			}
+
+			stream.seek(chunkEnd);
+		}
+
+		stream.seek(frameEnd);
+	}
+}
+
+void Aseprite::parse_layer(Stream& stream, int frame)
+{
+	layers.emplace_back();
+
+	auto& layer = layers.back();
+	layer.flag = static_cast<LayerFlags>(stream.read<uint16_t>(Endian::Little));
+	layer.visible = ((int)layer.flag & (int)LayerFlags::Visible) == (int)LayerFlags::Visible;
+	layer.type = static_cast<LayerTypes>(stream.read<uint16_t>(Endian::Little));
+	layer.child_level = stream.read<uint16_t>(Endian::Little);
+	stream.read<uint16_t>(Endian::Little); // width
+	stream.read<uint16_t>(Endian::Little); // height
+	layer.blendmode = stream.read<uint16_t>(Endian::Little);
+	layer.alpha = stream.read<uint8_t>(Endian::Little);
+	stream.seek(stream.position() + 3); // for future
+
+	layer.name.set_length(stream.read<uint16_t>(Endian::Little));
+	stream.read(layer.name.cstr(), layer.name.length());
+
+	layer.userdata.color = 0xffffff;
+	layer.userdata.text = "";
+	m_last_userdata = &(layer.userdata);
+}
+
+void Aseprite::parse_cel(Stream& stream, int frameIndex, size_t maxPosition)
+{
+	Frame& frame = frames[frameIndex];
+
+	frame.cels.emplace_back();
+	auto& cel = frame.cels.back();
+	cel.layer_index = stream.read<uint16_t>(Endian::Little);
+	cel.x = stream.read<uint16_t>(Endian::Little);
+	cel.y = stream.read<uint16_t>(Endian::Little);
+	cel.alpha = stream.read<uint8_t>(Endian::Little);
+	cel.linked_frame_index = -1;
+
+	auto celType = stream.read<uint16_t>(Endian::Little);
+	stream.seek(stream.position() + 7);
+
+	// RAW or DEFLATE
+	if (celType == 0 || celType == 2)
+	{
+		auto width = stream.read<uint16_t>(Endian::Little);
+		auto height = stream.read<uint16_t>(Endian::Little);
+		auto count = width * height * (int)mode;
+
+		cel.image = Image(width, height);
+
+		// RAW
+		if (celType == 0)
+		{
+			stream.read(cel.image.pixels, count);
+		}
+		// DEFLATE (zlib)
+		else
+		{
+			// this could be optimized to use a buffer on the stack if we only read set chunks at a time
+			// stbi's zlib doesn't have that functionality though
+			auto size = maxPosition - stream.position();
+			if (size > INT32_MAX)
+				size = INT32_MAX;
+
+			char* buffer = new char[size];
+			stream.read(buffer, size);
+
+			int olen = width * height * sizeof(Color);
+			int res = stbi_zlib_decode_buffer((char*)cel.image.pixels, olen, buffer, (int)size);
+
+			delete[] buffer;
+
+			if (res < 0)
+			{
+				BLAH_ERROR("Unable to parse Aseprite file");
+				return;
+			}
+		}
+
+		// convert to pixels
+		// note: we work in-place to save having to store stuff in a buffer
+		if (mode == Modes::Grayscale)
+		{
+			auto src = (unsigned char*)cel.image.pixels;
+			auto dst = cel.image.pixels;
+			for (int d = width * height - 1, s = (width * height - 1) * 2; d >= 0; d--, s -= 2)
+				dst[d] = Color(src[s], src[s], src[s], src[s + 1]);
+		}
+		else if (mode == Modes::Indexed)
+		{
+			auto src = (unsigned char*)cel.image.pixels;
+			auto dst = cel.image.pixels;
+			for (int i = width * height - 1; i >= 0; i--)
+				dst[i] = palette[src[i]];
+		}
+
+	}
+	// REFERENCE
+	// this cel directly references a previous cel
+	else if (celType == 1)
+	{
+		cel.linked_frame_index = stream.read<uint16_t>(Endian::Little);
+	}
+
+	// draw to frame if visible
+	if ((int)layers[cel.layer_index].flag & (int)LayerFlags::Visible)
+	{
+		render_cel(&cel, &frame);
+	}
+
+	cel.userdata.color = 0xffffff;
+	cel.userdata.text = "";
+	m_last_userdata = &(cel.userdata);
+}
+
+void Aseprite::parse_palette(Stream& stream, int frame)
+{
+	/* size */ stream.read<uint32_t>(Endian::Little);
+	auto start = stream.read<uint32_t>(Endian::Little);
+	auto end = stream.read<uint32_t>(Endian::Little);
+	stream.seek(stream.position() + 8);
+
+	palette.resize(palette.size() + (end - start + 1));
+
+	for (int p = 0, len = static_cast<int>(end - start) + 1; p < len; p++)
+	{
+		auto hasName = stream.read<uint16_t>(Endian::Little);
+
+		palette[start + p] = stream.read<Color>(Endian::Little);
+
+		if (hasName & 0xF000)
+		{
+			int len = stream.read<uint16_t>(Endian::Little);
+			stream.seek(stream.position() + len);
+		}
+	}
+}
+
+void Aseprite::parse_user_data(Stream& stream, int frame)
+{
+	if (m_last_userdata != nullptr)
+	{
+		auto flags = stream.read<uint32_t>(Endian::Little);
+
+		// has text
+		if (flags & (1 << 0))
+		{
+			m_last_userdata->text.set_length(stream.read<uint16_t>(Endian::Little));
+			stream.read(m_last_userdata->text.cstr(), m_last_userdata->text.length());
+		}
+
+		// has color
+		if (flags & (1 << 1))
+			m_last_userdata->color = stream.read<Color>(Endian::Little);
+	}
+}
+
+void Aseprite::parse_tag(Stream& stream, int frame)
+{
+	auto count = stream.read<uint16_t>(Endian::Little);
+	stream.seek(stream.position() + 8);
+
+	for (int t = 0; t < count; t++)
+	{
+		Tag tag;
+		tag.from = stream.read<uint16_t>(Endian::Little);
+		tag.to = stream.read<uint16_t>(Endian::Little);
+		tag.loops = static_cast<LoopDirections>(stream.read<int8_t>(Endian::Little));
+
+		stream.seek(stream.position() + 8);
+		tag.color = Color(stream.read<int8_t>(), stream.read<int8_t>(), stream.read<int8_t>(Endian::Little), 255);
+		stream.seek(stream.position() + 1);
+
+		tag.name.set_length(stream.read<uint16_t>(Endian::Little));
+		stream.read(tag.name.cstr(), tag.name.length());
+
+		tags.push_back(tag);
+	}
+}
+
+void Aseprite::parse_slice(Stream& stream, int frame)
+{
+	int count = stream.read<uint32_t>(Endian::Little);
+	int flags = stream.read<uint32_t>(Endian::Little);
+	stream.read<uint32_t>(Endian::Little); // reserved
+
+	String name;
+	name.set_length(stream.read<uint16_t>(Endian::Little));
+	stream.read(name.cstr(), name.length());
+
+	for (int s = 0; s < count; s++)
+	{
+		slices.emplace_back();
+
+		auto& slice = slices.back();
+		slice.name = name;
+		slice.frame = stream.read<uint32_t>(Endian::Little);
+		slice.origin.x = stream.read<int32_t>(Endian::Little);
+		slice.origin.y = stream.read<int32_t>(Endian::Little);
+		slice.width = stream.read<uint32_t>(Endian::Little);
+		slice.height = stream.read<uint32_t>(Endian::Little);
+
+		// 9 slice (ignored atm)
+		if (flags & (1 << 0))
+		{
+			stream.read<int32_t>(Endian::Little);
+			stream.read<int32_t>(Endian::Little);
+			stream.read<uint32_t>(Endian::Little);
+			stream.read<uint32_t>(Endian::Little);
+		}
+
+		// pivot point
+		slice.has_pivot = false;
+		if (flags & (1 << 1))
+		{
+			slice.has_pivot = true;
+			slice.pivot.x = stream.read<uint32_t>(Endian::Little);
+			slice.pivot.y = stream.read<uint32_t>(Endian::Little);
+		}
+
+		slice.userdata.color = 0xffffff;
+		slice.userdata.text = "";
+		m_last_userdata = &(slice.userdata);
+	}
+}
+
+void Aseprite::render_cel(Cel* cel, Frame* frame)
+{
+	Layer& layer = layers[cel->layer_index];
+
+	while (cel->linked_frame_index >= 0)
+	{
+		auto& frame = frames[cel->linked_frame_index];
+		for (auto& it : frame.cels)
+			if (it.layer_index == cel->layer_index)
+			{
+				cel = &it;
+				break;
+			}
+	}
+
+	int t;
+	unsigned char opacity = MUL_UN8(cel->alpha, layer.alpha, t);
+	if (opacity <= 0)
+		return;
+
+	auto src = cel->image.pixels;
+	auto srcX = cel->x;
+	auto srcY = cel->y;
+	auto srcW = cel->image.width;
+	auto srcH = cel->image.height;
+	auto dst = frame->image.pixels;
+	auto dstW = frame->image.width;
+	auto dstH = frame->image.height;
+
+	// blit pixels
+	int left = MAX(0, srcX);
+	int right = MIN(dstW, srcX + srcW);
+	int top = MAX(0, srcY);
+	int bottom = MIN(dstH, srcY + srcH);
+
+	if (layer.blendmode == 0)
+	{
+		for (int dx = left, sx = -MIN(srcX, 0); dx < right; dx++, sx++)
+		{
+			for (int dy = top, sy = -MIN(srcY, 0); dy < bottom; dy++, sy++)
+			{
+				Color* srcColor = (src + sx + sy * srcW);
+				Color* dstColor = (dst + dx + dy * dstW);
+
+				if (srcColor->a != 0)
+				{
+					auto sa = MUL_UN8(srcColor->a, opacity, t);
+					auto ra = dstColor->a + sa - MUL_UN8(dstColor->a, sa, t);
+
+					dstColor->r = (unsigned char)(dstColor->r + (srcColor->r - dstColor->r) * sa / ra);
+					dstColor->g = (unsigned char)(dstColor->g + (srcColor->g - dstColor->g) * sa / ra);
+					dstColor->b = (unsigned char)(dstColor->b + (srcColor->b - dstColor->b) * sa / ra);
+					dstColor->a = (unsigned char)ra;
+				}
+			}
+		}
+	}
+	else
+	{
+		BLAH_ERROR("Aseprite blendmodes aren't implemented");
+	}
+}

src/images/font.cpp

@@ -0,0 +1,245 @@
+#include <blah/images/font.h>
+#include <blah/streams/filestream.h>
+#include <blah/math/calc.h>
+#include <blah/core/log.h>
+
+using namespace Blah;
+
+#define STBTT_STATIC
+#define STB_TRUETYPE_IMPLEMENTATION
+#include "../third_party/stb_truetype.h"
+
+String GetName(stbtt_fontinfo* font, int nameId)
+{
+	int length = 0;
+
+	// get the name
+	const uint16_t* ptr = (const uint16_t*)stbtt_GetFontNameStr(font, &length,
+		STBTT_PLATFORM_ID_MICROSOFT,
+		STBTT_MS_EID_UNICODE_BMP,
+		STBTT_MS_LANG_ENGLISH,
+		nameId);
+
+	// we want the size in wide chars
+	length /= 2;
+
+	String str;
+	if (length > 0)
+		str.append_utf16(ptr, ptr + length, Calc::is_little_endian());
+	return str;
+}
+
+Font::Font()
+{
+	m_font = nullptr;
+	m_data = nullptr;
+	m_ascent = 0;
+	m_descent = 0;
+	m_line_gap = 0;
+	m_valid = false;
+}
+
+Font::Font(Stream& stream) : Font()
+{
+	load(stream);
+}
+
+Font::Font(const char* path) : Font()
+{
+	FileStream fs(path, FileMode::Read);
+	if (fs.is_readable())
+		load(fs);
+}
+
+Font::Font(Font&& src) noexcept
+{
+	m_font = src.m_font;
+	m_data = src.m_data;
+	m_family_name = src.m_family_name;
+	m_style_name = src.m_style_name;
+	m_ascent = src.m_ascent;
+	m_descent = src.m_descent;
+	m_line_gap = src.m_line_gap;
+	m_valid = src.m_valid;
+
+	src.m_family_name.clear();
+	src.m_style_name.clear();
+	src.m_valid = false;
+	src.m_font = nullptr;
+	src.m_data = nullptr;
+}
+
+Font& Font::operator=(Font&& src) noexcept
+{
+	m_font = src.m_font;
+	m_data = src.m_data;
+	m_family_name = src.m_family_name;
+	m_style_name = src.m_style_name;
+	m_ascent = src.m_ascent;
+	m_descent = src.m_descent;
+	m_line_gap = src.m_line_gap;
+	m_valid = src.m_valid;
+
+	src.m_family_name.clear();
+	src.m_style_name.clear();
+	src.m_valid = false;
+	src.m_font = nullptr;
+	src.m_data = nullptr;
+	return *this;
+}
+
+Font::~Font()
+{
+	dispose();
+}
+
+void Font::load(Stream& stream)
+{
+	dispose();
+
+	if (!stream.is_readable())
+	{
+		BLAH_ERROR("Unable to load a font as the Stream was not readable");
+		return;
+	}
+
+	// create data buffer
+	auto size = stream.length();
+	m_data = new unsigned char[size];
+	stream.read(m_data, size);
+
+	// init font
+	m_font = new stbtt_fontinfo();
+	auto fn = (stbtt_fontinfo*)m_font;
+	stbtt_InitFont(fn, m_data, 0);
+	m_family_name = GetName(fn, 1);
+	m_style_name = GetName(fn, 2);
+	
+	// properties
+	stbtt_GetFontVMetrics(fn, &m_ascent, &m_descent, &m_line_gap);
+	m_valid = true;
+}
+
+void Font::dispose()
+{
+	delete (stbtt_fontinfo*)m_font;
+	delete[] m_data;
+	m_font = nullptr;
+	m_data = nullptr;
+	m_family_name.dispose();
+	m_style_name.dispose();
+}
+
+const char* Font::family_name() const
+{
+	return m_family_name.cstr();
+}
+
+const char* Font::style_name() const
+{
+	return m_style_name.cstr();
+}
+
+int Font::ascent() const
+{
+	return m_ascent;
+}
+
+int Font::descent() const
+{
+	return m_descent;
+}
+
+int Font::line_gap() const
+{
+	return m_line_gap;
+}
+
+int Font::height() const
+{
+	return m_ascent - m_descent;
+}
+
+int Font::line_height() const
+{
+	return m_ascent - m_descent + m_line_gap;
+}
+
+int Font::get_glyph(Codepoint codepoint) const
+{
+	if (!m_font)
+		return 0;
+	return stbtt_FindGlyphIndex((stbtt_fontinfo*)m_font, codepoint);
+}
+
+float Font::get_scale(float size) const
+{
+	if (!m_font)
+		return 0;
+	
+	return stbtt_ScaleForMappingEmToPixels((stbtt_fontinfo*)m_font, size);
+}
+
+float Font::get_kerning(int glyph1, int glyph2, float scale) const
+{
+	if (!m_font)
+		return 0;
+	return stbtt_GetGlyphKernAdvance((stbtt_fontinfo*)m_font, glyph1, glyph2) * scale;
+}
+
+Font::Char Font::get_character(int glyph, float scale) const
+{
+	Char ch;
+
+	if (!m_font)
+		return ch;
+
+	int advance, offsetX, x0, y0, x1, y1;
+
+	stbtt_GetGlyphHMetrics((stbtt_fontinfo*)m_font, glyph, &advance, &offsetX);
+	stbtt_GetGlyphBitmapBox((stbtt_fontinfo*)m_font, glyph, scale, scale, &x0, &y0, &x1, &y1);
+
+	int w = (x1 - x0);
+	int h = (y1 - y0);
+
+	// define character
+	ch.glyph = glyph;
+	ch.width = w;
+	ch.height = h;
+	ch.advance = advance * scale;
+	ch.offset_x = offsetX * scale;
+	ch.offset_y = (float)y0;
+	ch.scale = scale;
+	ch.has_glyph = (w > 0 && h > 0 && stbtt_IsGlyphEmpty((stbtt_fontinfo*)m_font, glyph) == 0);
+
+	return ch;
+}
+
+bool Font::get_image(const Font::Char& ch, Color* pixels) const
+{
+	if (ch.has_glyph)
+	{
+		// we actually use the image buffer as our temporary buffer, and fill the pixels out backwards after
+		// kinda weird but it works & saves creating more memory
+		unsigned char* src = (unsigned char*)pixels;
+		stbtt_MakeGlyphBitmap((stbtt_fontinfo*)m_font, src, ch.width, ch.height, ch.width, ch.scale, ch.scale, ch.glyph);
+
+		int len = ch.width * ch.height;
+		for (int a = (len - 1) * 4, b = (len - 1); b >= 0; a -= 4, b -= 1)
+		{
+			src[a + 0] = src[b];
+			src[a + 1] = src[b];
+			src[a + 2] = src[b];
+			src[a + 3] = src[b];
+		}
+
+		return true;
+	}
+
+	return false;
+}
+
+bool Font::is_valid() const
+{
+	return m_valid;
+}

src/images/image.cpp

@@ -0,0 +1,301 @@
+#include <blah/images/image.h>
+#include <blah/streams/stream.h>
+#include <blah/streams/filestream.h>
+#include <blah/core/log.h>
+
+using namespace Blah;
+
+#define STB_IMAGE_IMPLEMENTATION
+#define STBI_ONLY_JPEG
+#define STBI_ONLY_PNG
+#define STBI_ONLY_BMP
+#include "../third_party/stb_image.h"
+
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "../third_party/stb_image_write.h"
+
+namespace
+{
+	int Blah_STBI_Read(void* user, char* data, int size)
+	{
+		int64_t read = ((Stream*)user)->read(data, size);
+		return (int)read;
+	}
+
+	void Blah_STBI_Skip(void* user, int n)
+	{
+		((Stream*)user)->seek(((Stream*)user)->position() + n);
+	}
+
+	int Blah_STBI_Eof(void* user)
+	{
+		int64_t position = ((Stream*)user)->position();
+		int64_t length = ((Stream*)user)->length();
+
+		if (position >= length)
+			return 1;
+
+		return 0;
+	}
+
+	void Blah_STBI_Write(void* context, void* data, int size)
+	{
+		((Stream*)context)->write((char*)data, size);
+	}
+}
+
+Image::Image()
+{
+	width = height = 0;
+	pixels = nullptr;
+	m_stbi_ownership = false;
+}
+
+Image::Image(Stream& stream)
+{
+	width = height = 0;
+	pixels = nullptr;
+	m_stbi_ownership = false;
+	from_stream(stream);
+}
+
+Image::Image(const char* file)
+{
+	width = height = 0;
+	pixels = nullptr;
+	m_stbi_ownership = false;
+
+	FileStream fs(file, FileMode::Read);
+	if (fs.is_readable())
+		from_stream(fs);
+}
+
+Image::Image(int w, int h)
+{
+	BLAH_ASSERT(w >= 0 && h >= 0, "Image width and height must be larger than 0");
+
+	width = w;
+	height = h;
+	pixels = new Color[width * height];
+	m_stbi_ownership = false;
+	memset(pixels, 0, (size_t)width * (size_t)height * sizeof(Color));
+}
+
+Image::Image(const Image& src)
+{
+	width = src.width;
+	height = src.height;
+	m_stbi_ownership = src.m_stbi_ownership;
+	pixels = nullptr;
+
+	if (src.pixels != nullptr && width > 0 && height > 0)
+	{
+		pixels = new Color[width * height];
+		memcpy(pixels, src.pixels, sizeof(Color) * width * height);
+	}
+}
+
+Image& Image::operator=(const Image& src)
+{
+	width = src.width;
+	height = src.height;
+	m_stbi_ownership = src.m_stbi_ownership;
+	pixels = nullptr;
+
+	if (src.pixels != nullptr && width > 0 && height > 0)
+	{
+		pixels = new Color[width * height];
+		memcpy(pixels, src.pixels, sizeof(Color) * width * height);
+	}
+
+	return *this;
+}
+
+Image::Image(Image&& src) noexcept
+{
+	width = src.width;
+	height = src.height;
+	pixels = src.pixels;
+	m_stbi_ownership = src.m_stbi_ownership;
+	src.width = src.height = 0;
+	src.pixels = nullptr;
+	src.m_stbi_ownership = false;
+}
+
+Image& Image::operator=(Image&& src) noexcept
+{
+	width = src.width;
+	height = src.height;
+	pixels = src.pixels;
+	m_stbi_ownership = src.m_stbi_ownership;
+	src.width = src.height = 0;
+	src.pixels = nullptr;
+	src.m_stbi_ownership = false;
+	return *this;
+}
+
+Image::~Image()
+{
+	dispose();
+}
+
+void Image::from_stream(Stream& stream)
+{
+	dispose();
+
+	if (!stream.is_readable())
+	{
+		BLAH_ERROR("Unable to load image as the Stream was not readable");
+		return;
+	}
+
+	stbi_io_callbacks callbacks;
+	callbacks.eof = Blah_STBI_Eof;
+	callbacks.read = Blah_STBI_Read;
+	callbacks.skip = Blah_STBI_Skip;
+
+	int x, y, comps;
+	uint8_t* data = stbi_load_from_callbacks(&callbacks, &stream, &x, &y, &comps, 4);
+
+	if (data == nullptr)
+	{
+		BLAH_ERROR("Unable to load image as the Stream's data was not a valid image");
+		return;
+	}
+
+	m_stbi_ownership = true;
+	pixels = (Color*)data;
+	width = x;
+	height = y;
+}
+
+void Image::dispose()
+{
+	if (m_stbi_ownership)
+		stbi_image_free(pixels);
+	else
+		delete[] pixels;
+	pixels = nullptr;
+	width = height = 0;
+	m_stbi_ownership = false;
+}
+
+void Image::premultiply()
+{
+	if (pixels != nullptr)
+	{
+		for (int n = 0; n < width * height; n ++)
+		{
+			pixels[n].r = (uint8_t)(pixels[n].r * pixels[n].a / 255);
+			pixels[n].g = (uint8_t)(pixels[n].g * pixels[n].a / 255);
+			pixels[n].b = (uint8_t)(pixels[n].b * pixels[n].a / 255);
+		}
+	}
+}
+
+void Image::set_pixels(const RectI& rect, Color* data)
+{
+	for (int y = 0; y < rect.h; y++)
+	{
+		int to = rect.x + ((rect.y + y) * width);
+		int from = (y * rect.w);
+		memcpy(pixels + to, data + from, sizeof(Color) * rect.w);
+	}
+}
+
+bool Image::save_png(const char* file) const
+{
+	FileStream fs(file, FileMode::Write);
+	return save_png(fs);
+}
+
+bool Image::save_png(Stream& stream) const
+{
+	BLAH_ASSERT(pixels != nullptr, "Image Pixel data cannot be null");
+	BLAH_ASSERT(width > 0 && height > 0, "Image Width and Height must be larger than 0");
+	
+	if (stream.is_writable())
+	{
+		stbi_write_force_png_filter = 0;
+		stbi_write_png_compression_level = 0;
+
+		if (stbi_write_png_to_func(Blah_STBI_Write, &stream, width, height, 4, pixels, width * 4) != 0)
+			return true;
+		else
+			Log::error("stbi_write_png_to_func failed");
+	}
+	else
+	{
+		Log::error("Cannot save Image, the Stream is not writable");
+	}
+
+	return false;
+}
+
+bool Image::save_jpg(const char* file, int quality) const
+{
+	FileStream fs(file, FileMode::Write);
+	return save_jpg(fs, quality);
+}
+
+bool Image::save_jpg(Stream& stream, int quality) const
+{
+	BLAH_ASSERT(pixels != nullptr, "Image Pixel data cannot be null");
+	BLAH_ASSERT(width > 0 && height > 0, "Image Width and Height must be larger than 0");
+
+	if (quality < 1)
+	{
+		Log::warn("jpg quality value should be between 1 and 100; input was %i", quality);
+		quality = 1;
+	}
+	else if (quality > 100)
+	{
+		Log::warn("jpg quality value should be between 1 and 100; input was %i", quality);
+		quality = 100;
+	}
+
+	if (stream.is_writable())
+	{
+		if (stbi_write_jpg_to_func(Blah_STBI_Write, &stream, width, height, 4, pixels, quality) != 0)
+			return true;
+		else
+			Log::error("stbi_write_jpg_to_func failed");
+	}
+	else
+	{
+		Log::error("Cannot save Image, the Stream is not writable");
+	}
+
+	return false;
+}
+
+
+
+void Image::get_pixels(Color* dest, const Point& destPos, const Point& destSize, RectI sourceRect)
+{
+	// can't be outside of the source image
+	if (sourceRect.x < 0) sourceRect.x = 0;
+	if (sourceRect.y < 0) sourceRect.y = 0;
+	if (sourceRect.x + sourceRect.w > width) sourceRect.w = width - sourceRect.x;
+	if (sourceRect.y + sourceRect.h > height) sourceRect.h = height - sourceRect.y;
+
+	// can't be larger than our destination
+	if (sourceRect.w > destSize.x - destPos.x)
+		sourceRect.w = destSize.x - destPos.x;
+	if (sourceRect.h > destSize.y - destPos.y)
+		sourceRect.h = destSize.y - destPos.y;
+
+	for (int y = 0; y < sourceRect.h; y++)
+	{
+		int to = destPos.x + (destPos.y + y) * destSize.x;
+		int from = sourceRect.x + (sourceRect.y + y) * width;
+		memcpy(dest + to, pixels + from, sizeof(Color) * (int)sourceRect.w);
+	}
+}
+
+Image Image::get_sub_image(const RectI& sourceRect)
+{
+	Image img(sourceRect.w, sourceRect.h);
+	get_pixels(img.pixels, Point::zero, Point(img.width, img.height), sourceRect);
+	return img;
+}

src/images/packer.cpp

@@ -0,0 +1,334 @@
+#include <blah/images/packer.h>
+#include <blah/core/log.h>
+#include <algorithm>
+#include <cstring>
+
+using namespace Blah;
+
+Packer::Packer()
+	: max_size(8192), power_of_two(true), spacing(1), padding(1), m_dirty(false) { }
+
+Packer::Packer(int max_size, int spacing, bool power_of_two)
+	: max_size(max_size), power_of_two(power_of_two), spacing(spacing), padding(1), m_dirty(false) { }
+
+Packer::Packer(Packer&& src) noexcept
+{
+	max_size = src.max_size;
+	power_of_two = src.power_of_two;
+	spacing = src.spacing;
+	padding = src.padding;
+	m_dirty = src.m_dirty;
+	pages = std::move(src.pages);
+	entries = std::move(src.entries);
+	m_buffer = std::move(src.m_buffer);
+}
+
+Packer& Packer::operator=(Packer&& src) noexcept
+{
+	max_size = src.max_size;
+	power_of_two = src.power_of_two;
+	spacing = src.spacing;
+	padding = src.padding;
+	m_dirty = src.m_dirty;
+	pages = std::move(src.pages);
+	entries = std::move(src.entries);
+	m_buffer = std::move(src.m_buffer);
+	return *this;
+}
+
+Packer::~Packer()
+{
+	dispose();
+}
+
+void Packer::add(uint64_t id, int width, int height, const Color* pixels)
+{
+	add_entry(id, width, height, pixels);
+}
+
+void Packer::add(uint64_t id, const Image& image)
+{
+	add_entry(id, image.width, image.height, image.pixels);
+}
+
+void Packer::add(uint64_t id, const String& path)
+{
+	add(id, Image(path.cstr()));
+}
+
+void Packer::add_entry(uint64_t id, int w, int h, const Color* pixels)
+{
+	m_dirty = true;
+
+	Entry entry(id, RectI(0, 0, w, h));
+
+	// trim
+	int top = 0, left = 0, right = w, bottom = h;
+
+	// TOP:
+	for (int y = 0; y < h; y++)
+		for (int x = 0, s = y * w; x < w; x++, s++)
+			if (pixels[s].a > 0)
+			{
+				top = y;
+				goto JUMP_LEFT;
+			}
+	JUMP_LEFT:
+	for (int x = 0; x < w; x++)
+		for (int y = top, s = x + y * w; y < h; y++, s += w)
+			if (pixels[s].a > 0)
+			{
+				left = x;
+				goto JUMP_RIGHT;
+			}
+	JUMP_RIGHT:
+	for (int x = w - 1; x >= left; x--)
+		for (int y = top, s = x + y * w; y < h; y++, s += w)
+			if (pixels[s].a > 0)
+			{
+				right = x + 1;
+				goto JUMP_BOTTOM;
+			}
+	JUMP_BOTTOM:
+	for (int y = h - 1; y >= top; y--)
+		for (int x = left, s = x + y * w; x < right; x++, s++)
+			if (pixels[s].a > 0)
+			{
+				bottom = y + 1;
+				goto JUMP_END;
+			}
+	JUMP_END:;
+
+	// pixels actually exist in this source
+	if (right >= left && bottom >= top)
+	{
+		entry.empty = false;
+
+		// store size
+		entry.frame.x = -left;
+		entry.frame.y = -top;
+		entry.packed.w = (right - left);
+		entry.packed.h = (bottom - top);
+
+		// create pixel data
+		entry.memory_index = m_buffer.position();
+
+		// copy pixels over
+		if (entry.packed.w == w && entry.packed.h == h)
+		{
+			m_buffer.write((char*)pixels, sizeof(Color) * w * h);
+		}
+		else
+		{
+			for (int i = 0; i < entry.packed.h; i++)
+				m_buffer.write((char*)(pixels + left + (top + i) * entry.frame.w), sizeof(Color) * entry.packed.w);
+		}
+	}
+
+	entries.push_back(entry);
+}
+
+void Packer::pack()
+{
+	if (!m_dirty)
+		return;
+
+	m_dirty = false;
+	pages.clear();
+
+	// only if we have stuff to pack
+	auto count = entries.size();
+	if (count > 0)
+	{
+		// get all the sources sorted largest -> smallest
+		Vector<Entry*> sources;
+		{
+			sources.resize(count);
+			int index = 0;
+
+			for (int i = 0; i < entries.size(); i++)
+				sources[index++] = &entries[i];
+
+			std::sort(sources.begin(), sources.end(), [](Packer::Entry* a, Packer::Entry* b)
+			{
+				return a->packed.w * a->packed.h > b->packed.w * b->packed.h;
+			});
+		}
+
+		// make sure the largest isn't too large
+		if (sources[0]->packed.w + padding * 2 > max_size || sources[0]->packed.h + padding * 2 > max_size)
+		{
+			BLAH_ERROR("Source image is larger than max atlas size");
+			return;
+		}
+
+		// we should never need more nodes than source images * 3
+		// if this causes problems we could change it to use push_back I suppose
+		Vector<Node> nodes;
+		nodes.resize(count * 4);
+
+		int packed = 0, page = 0;
+		while (packed < count)
+		{
+			if (sources[packed]->empty)
+			{
+				packed++;
+				continue;
+			}
+
+			int from = packed;
+			int index = 0;
+			Node* root = nodes[index++].Reset(RectI(0, 0, sources[from]->packed.w + padding * 2 + spacing, sources[from]->packed.h + padding * 2 + spacing));
+
+			while (packed < count)
+			{
+				if (sources[packed]->empty)
+				{
+					packed++;
+					continue;
+				}
+
+				int w = sources[packed]->packed.w + padding * 2 + spacing;
+				int h = sources[packed]->packed.h + padding * 2 + spacing;
+
+				Node* node = root->Find(w, h);
+
+				// try to expand
+				if (node == nullptr)
+				{
+					bool canGrowDown = (w <= root->rect.w) && (root->rect.h + h < max_size);
+					bool canGrowRight = (h <= root->rect.h) && (root->rect.w + w < max_size);
+					bool shouldGrowRight = canGrowRight && (root->rect.h >= (root->rect.w + w));
+					bool shouldGrowDown = canGrowDown && (root->rect.w >= (root->rect.h + h));
+
+					if (canGrowDown || canGrowRight)
+					{
+						// grow right
+						if (shouldGrowRight || (!shouldGrowDown && canGrowRight))
+						{
+							Node* next = nodes[index++].Reset(RectI(0, 0, root->rect.w + w, root->rect.h));
+							next->used = true;
+							next->down = root;
+							next->right = node = nodes[index++].Reset(RectI(root->rect.w, 0, w, root->rect.h));
+							root = next;
+						}
+						// grow down
+						else
+						{
+							Node* next = nodes[index++].Reset(RectI(0, 0, root->rect.w, root->rect.h + h));
+							next->used = true;
+							next->down = node = nodes[index++].Reset(RectI(0, root->rect.h, root->rect.w, h));
+							next->right = root;
+							root = next;
+						}
+					}
+				}
+
+				// doesn't fit
+				if (node == nullptr)
+					break;
+
+				// add
+				node->used = true;
+				node->down = nodes[index++].Reset(RectI(node->rect.x, node->rect.y + h, node->rect.w, node->rect.h - h));
+				node->right = nodes[index++].Reset(RectI(node->rect.x + w, node->rect.y, node->rect.w - w, h));
+
+				sources[packed]->packed.x = node->rect.x + padding;
+				sources[packed]->packed.y = node->rect.y + padding;
+				packed++;
+			}
+
+			// get page size
+			int pageWidth, pageHeight;
+			if (power_of_two)
+			{
+				pageWidth = 2;
+				pageHeight = 2;
+				while (pageWidth < root->rect.w)
+					pageWidth *= 2;
+				while (pageHeight < root->rect.h)
+					pageHeight *= 2;
+			}
+			else
+			{
+				pageWidth = root->rect.w;
+				pageHeight = root->rect.h;
+			}
+
+			// create each page
+			{
+				pages.emplace_back(pageWidth, pageHeight);
+
+				// copy image data to image
+				for (int i = from; i < packed; i++)
+				{
+					sources[i]->page = page;
+					if (!sources[i]->empty)
+					{
+						RectI dst = sources[i]->packed;
+						Color* src = (Color*)(m_buffer.data() + sources[i]->memory_index);
+
+						// TODO:
+						// Optimize this?
+						if (padding > 0)
+						{
+							pages[page].set_pixels(RectI(dst.x - padding, dst.y, dst.w, dst.h), src);
+							pages[page].set_pixels(RectI(dst.x + padding, dst.y, dst.w, dst.h), src);
+							pages[page].set_pixels(RectI(dst.x, dst.y - padding, dst.w, dst.h), src);
+							pages[page].set_pixels(RectI(dst.x, dst.y + padding, dst.w, dst.h), src);
+						}
+
+						pages[page].set_pixels(dst, src);
+
+					}
+				}
+			}
+
+			page++;
+		}
+	}
+}
+
+void Packer::clear()
+{
+	pages.clear();
+	entries.clear();
+	m_dirty = false;
+}
+
+void Packer::dispose()
+{
+	pages.clear();
+	entries.clear();
+	m_buffer.close();
+	max_size = 0;
+	power_of_two = 0;
+	spacing = 0;
+	m_dirty = false;
+}
+
+Packer::Node::Node()
+	: used(false), rect(0, 0, 0, 0), right(nullptr), down(nullptr) { }
+
+Packer::Node* Packer::Node::Find(int w, int h)
+{
+	if (used)
+	{
+		Packer::Node* r = right->Find(w, h);
+		if (r != nullptr)
+			return r;
+		return down->Find(w, h);
+	}
+	else if (w <= rect.w && h <= rect.h)
+		return this;
+	return nullptr;
+}
+
+Packer::Node* Packer::Node::Reset(const RectI& rect)
+{
+	used = false;
+	this->rect = rect;
+	right = nullptr;
+	down = nullptr;
+	return this;
+}

src/input/input.cpp

@@ -0,0 +1,403 @@
+#include <blah/input/input.h>
+#include <blah/core/app.h>
+#include <blah/core/time.h>
+#include <blah/core/log.h>
+#include <blah/math/point.h>
+#include "../internal/input_backend.h"
+#include <string.h>
+
+using namespace Blah;
+
+namespace
+{
+	InputState g_last_state;
+	InputState g_curr_state;
+	InputState g_next_state;
+	InputState g_empty_state;
+	ControllerState g_empty_controller;
+}
+
+void InputBackend::init()
+{
+	g_empty_controller.name = "Disconnected";
+	for (int i = 0; i < Blah::Input::max_controllers; i++)
+		g_empty_state.controllers[i].name = g_empty_controller.name;
+
+	g_last_state = g_empty_state;
+	g_curr_state = g_empty_state;
+	g_next_state = g_empty_state;
+}
+
+void InputBackend::frame()
+{
+	// cycle states
+	g_last_state = g_curr_state;
+	g_curr_state = g_next_state;
+
+	// copy state, clear pressed / released values
+	{
+		for (int i = 0; i < Blah::Input::max_keyboard_keys; i++)
+		{
+			g_next_state.keyboard.pressed[i] = false;
+			g_next_state.keyboard.released[i] = false;
+		}
+
+		for (int i = 0; i < Blah::Input::max_mouse_buttons; i++)
+		{
+			g_next_state.mouse.pressed[i] = false;
+			g_next_state.mouse.released[i] = false;
+		}
+		g_next_state.mouse.wheel = Point::zero;
+
+		for (int i = 0; i < Blah::Input::max_text_input; i++)
+			g_next_state.keyboard.text[i] = 0;
+
+		for (int i = 0; i < Blah::Input::max_controllers; i++)
+		{
+			ControllerState* controller = &(g_next_state.controllers[i]);
+
+			if (!controller->is_connected)
+				controller->name = nullptr;
+
+			for (int j = 0; j < Blah::Input::max_controller_buttons; j++)
+			{
+				controller->pressed[j] = false;
+				controller->released[j] = false;
+			}
+		}
+	}
+}
+
+void InputBackend::on_mouse_move(float x, float y)
+{
+	g_next_state.mouse.position.x = x;
+	g_next_state.mouse.position.y = y;
+
+	Point size = Point(App::width(), App::height());
+	Point draw = Point(App::draw_width(), App::draw_height());
+
+	g_next_state.mouse.draw_position.x = (x / (float)size.x) * draw.x;
+	g_next_state.mouse.draw_position.y = (y / (float)size.y) * draw.y;
+}
+
+void InputBackend::on_mouse_screen_move(float x, float y)
+{
+	g_next_state.mouse.screen_position.x = x;
+	g_next_state.mouse.screen_position.y = y;
+}
+
+void InputBackend::on_mouse_down(MouseButton button)
+{
+	int i = (int)button;
+	if (i >= 0 && i < Blah::Input::max_mouse_buttons)
+	{
+		g_next_state.mouse.down[i] = true;
+		g_next_state.mouse.pressed[i] = true;
+		g_next_state.mouse.timestamp[i] = Time::milliseconds;
+	}
+}
+
+void InputBackend::on_mouse_up(MouseButton button)
+{
+	int i = (int)button;
+	if (i >= 0 && i < Blah::Input::max_mouse_buttons)
+	{
+		g_next_state.mouse.down[i] = false;
+		g_next_state.mouse.released[i] = true;
+	}
+}
+
+void InputBackend::on_key_down(Key key)
+{
+	int i = (int)key;
+	if (i >= 0 && i < Blah::Input::max_keyboard_keys)
+	{
+		g_next_state.keyboard.down[i] = true;
+		g_next_state.keyboard.pressed[i] = true;
+		g_next_state.keyboard.timestamp[i] = Time::milliseconds;
+	}
+}
+
+void InputBackend::on_mouse_wheel(Point wheel)
+{
+	g_next_state.mouse.wheel = wheel;
+}
+
+void InputBackend::on_key_up(Key key)
+{
+	int i = (int)key;
+	if (i >= 0 && i < Blah::Input::max_keyboard_keys)
+	{
+		g_next_state.keyboard.down[i] = false;
+		g_next_state.keyboard.released[i] = true;
+	}
+}
+
+void InputBackend::on_text_utf8(const char* text)
+{
+	strncat(g_next_state.keyboard.text, text, Blah::Input::max_text_input);
+}
+
+void InputBackend::on_controller_connect(int index, const char* name, int is_gamepad, int button_count, int axis_count, uint16_t vendor, uint16_t product, uint16_t version)
+{
+	if (index < Blah::Input::max_controllers)
+	{
+		ControllerState* controller = &(g_next_state.controllers[index]);
+		*controller = g_empty_controller;
+		controller->name = name;
+		controller->is_connected = 1;
+		controller->is_gamepad = is_gamepad;
+		controller->button_count = button_count;
+		controller->axis_count = axis_count;
+		controller->vendor = vendor;
+		controller->product = product;
+		controller->version = version;
+	}
+}
+
+void InputBackend::on_controller_disconnect(int index)
+{
+	if (index < Blah::Input::max_controllers)
+		g_next_state.controllers[index] = g_empty_controller;
+}
+
+void InputBackend::on_button_down(int index, int button)
+{
+	if (index < Blah::Input::max_controllers &&
+		button < Blah::Input::max_controller_buttons &&
+		g_next_state.controllers[index].is_connected &&
+		button < g_next_state.controllers[index].button_count)
+	{
+		g_next_state.controllers[index].down[button] = 1;
+		g_next_state.controllers[index].pressed[button] = 1;
+		g_next_state.controllers[index].button_timestamp[button] = Time::milliseconds;
+	}
+}
+
+void InputBackend::on_button_up(int index, int button)
+{
+	if (index < Blah::Input::max_controllers &&
+		button < Blah::Input::max_controller_buttons &&
+		g_next_state.controllers[index].is_connected &&
+		button < g_next_state.controllers[index].button_count)
+	{
+		g_next_state.controllers[index].down[button] = 0;
+		g_next_state.controllers[index].released[button] = 1;
+	}
+}
+
+void InputBackend::on_axis_move(int index, int axis, float value)
+{
+	if (index < Blah::Input::max_controllers &&
+		axis < Blah::Input::max_controller_axis &&
+		g_next_state.controllers[index].is_connected &&
+		axis < g_next_state.controllers[index].axis_count)
+	{
+		g_next_state.controllers[index].axis[axis] = value;
+		g_next_state.controllers[index].axis_timestamp[axis] = Time::milliseconds;
+	}
+}
+
+const InputState* Input::state()
+{
+	return &g_curr_state;
+}
+
+const InputState* Input::last_state()
+{
+	return &g_last_state;
+}
+
+Vec2 Input::mouse()
+{
+	return g_curr_state.mouse.position;
+}
+
+
+Vec2 Input::mouse_draw()
+{
+	return Vec2(g_curr_state.mouse.draw_position);
+}
+
+Vec2 Input::mouse_screen()
+{
+	return Vec2(g_curr_state.mouse.screen_position);
+}
+
+bool Input::pressed(MouseButton button)
+{
+	int i = (int)button;
+	return i >= 0 && i < Blah::Input::max_mouse_buttons&& g_curr_state.mouse.pressed[i];
+}
+
+bool Input::down(MouseButton button)
+{
+	int i = (int)button;
+	return i >= 0 && i < Blah::Input::max_mouse_buttons&& g_curr_state.mouse.down[i];
+}
+
+bool Input::released(MouseButton button)
+{
+	int i = (int)button;
+	return i >= 0 && i < Blah::Input::max_mouse_buttons&& g_curr_state.mouse.released[i];
+}
+
+Point Input::mouse_wheel()
+{
+	return g_curr_state.mouse.wheel;
+}
+
+bool Input::pressed(Key key)
+{
+	int i = (int)key;
+	return i > 0 && i < Blah::Input::max_keyboard_keys&& g_curr_state.keyboard.pressed[i];
+}
+
+bool Input::down(Key key)
+{
+	int i = (int)key;
+	return i > 0 && i < Blah::Input::max_keyboard_keys&& g_curr_state.keyboard.down[i];
+}
+
+bool Input::released(Key key)
+{
+	int i = (int)key;
+	return i > 0 && i < Blah::Input::max_keyboard_keys&& g_curr_state.keyboard.released[i];
+}
+
+bool Input::ctrl()
+{
+	return down(Key::LeftControl) || down(Key::RightControl);
+}
+
+bool Input::shift()
+{
+	return down(Key::LeftShift) || down(Key::RightShift);
+}
+
+bool Input::alt()
+{
+	return down(Key::LeftAlt) || down(Key::RightAlt);
+}
+
+const char* Input::text()
+{
+	return g_curr_state.keyboard.text;
+}
+
+const ControllerState* Input::controller(int controllerIndex)
+{
+	if (controllerIndex >= Blah::Input::max_controllers)
+	{
+		Log::warn("Trying to access a out-of-range controller at %i", controllerIndex);
+		return &g_empty_controller;
+	}
+	else if (!g_curr_state.controllers[controllerIndex].is_connected)
+	{
+		return &g_empty_controller;
+	}
+	else
+	{
+		return &g_curr_state.controllers[controllerIndex];
+	}
+}
+
+bool Input::pressed(int controllerIndex, Button button)
+{
+	int i = (int)button;
+	if (controllerIndex < Blah::Input::max_controllers && i >= 0 && i < Blah::Input::max_controller_buttons)
+		return g_curr_state.controllers[controllerIndex].pressed[i];
+	return false;
+}
+
+bool Input::down(int controllerIndex, Button button)
+{
+	int i = (int)button;
+	if (controllerIndex < Blah::Input::max_controllers && i >= 0 && i < Blah::Input::max_controller_buttons)
+		return g_curr_state.controllers[controllerIndex].down[i];
+	return false;
+}
+
+bool Input::released(int controllerIndex, Button button)
+{
+	int i = (int)button;
+	if (controllerIndex < Blah::Input::max_controllers && i >= 0 && i < Blah::Input::max_controller_buttons)
+		return g_curr_state.controllers[controllerIndex].released[i];
+	return false;
+}
+
+float Input::axis_check(int controllerIndex, Axis axis)
+{
+	int i = (int)axis;
+	if (controllerIndex < Blah::Input::max_controllers && i >= 0 && i < Blah::Input::max_controller_axis)
+		return g_curr_state.controllers[controllerIndex].axis[i];
+	return 0;
+}
+
+int Input::axis_check(int fallback, Key negative, Key positive)
+{
+	if (Input::pressed(positive))
+		return 1;
+	else if (Input::pressed(negative))
+		return -1;
+	else
+	{
+		bool pos = Input::down(positive);
+		bool neg = Input::down(negative);
+
+		if (pos && neg)
+			return fallback;
+		else if (pos)
+			return 1;
+		else if (neg)
+			return -1;
+		else
+			return 0;
+	}
+}
+
+int Input::axis_check(int fallback, int controllerIndex, Button negative, Button positive)
+{
+	if (Input::pressed(controllerIndex, positive))
+		return 1;
+	else if (Input::pressed(controllerIndex, negative))
+		return -1;
+	else
+	{
+		bool pos = Input::down(controllerIndex, positive);
+		bool neg = Input::down(controllerIndex, negative);
+
+		if (pos && neg)
+			return fallback;
+		else if (pos)
+			return 1;
+		else if (neg)
+			return -1;
+		else
+			return 0;
+	}
+}
+
+const char* Input::name_of(Key key)
+{
+	switch (key)
+	{
+		#define DEFINE_KEY(name, value) case Key::name: return #name;
+		BLAH_KEY_DEFINITIONS
+		#undef DEFINE_KEY
+	}
+
+	return "Unknown";
+}
+
+const char* Input::name_of(Button button)
+{
+	switch (button)
+	{
+		#define DEFINE_BTN(name, value) case Button::name: return #name;
+		BLAH_BUTTON_DEFINITIONS
+		#undef DEFINE_BTN
+	}
+
+	return "Unknown";
+}

src/input/virtual_axis.cpp

@@ -0,0 +1,166 @@
+#include <blah/input/virtual_axis.h>
+#include <blah/core/time.h>
+#include <blah/core/log.h>
+
+using namespace Blah;
+
+VirtualAxis& VirtualAxis::add_keys(Key negative, Key positive)
+{
+	if (m_axes_len >= Input::max_virtual_nodes)
+		BLAH_ERROR("VirtualAxis Keys out of bounds!");
+	else
+	{
+		m_keys[m_keys_len].init(negative, positive);
+		m_keys_len++;
+	}
+
+	return *this;
+}
+
+VirtualAxis& VirtualAxis::add_buttons(int gamepad_id, Button negative, Button positive)
+{
+	if (m_axes_len >= Input::max_virtual_nodes)
+		BLAH_ERROR("VirtualAxis Buttons out of bounds!");
+	else
+	{
+		m_buttons[m_buttons_len].init(gamepad_id, negative, positive);
+		m_buttons_len++;
+	}
+
+	return *this;
+}
+
+VirtualAxis& VirtualAxis::add_axis(int gamepad_id, Axis axis, float deadzone)
+{
+	if (m_axes_len >= Input::max_virtual_nodes)
+		BLAH_ERROR("VirtualAxis Axes out of bounds!");
+	else
+	{
+		m_axes[m_axes_len].init(gamepad_id, axis, deadzone);
+		m_axes_len++;
+	}
+
+	return *this;
+}
+
+VirtualAxis& VirtualAxis::repeat(float m_repeat_delay, float m_repeat_interval)
+{
+	this->m_repeat_delay = m_repeat_delay;
+	this->m_repeat_interval = m_repeat_interval;
+	return *this;
+}
+
+VirtualAxis& VirtualAxis::press_buffer(float duration)
+{
+	this->m_press_buffer = duration;
+	return *this;
+}
+
+VirtualAxis& VirtualAxis::release_buffer(float duration)
+{
+	this->m_release_buffer = duration;
+	return *this;
+}
+
+void VirtualAxis::update()
+{
+	m_last_value = m_value;
+	m_value = 0;
+
+	for (int i = 0; i < m_keys_len; i++)
+	{
+		m_keys[i].update();
+		if (m_value == 0)
+			m_value = (float)m_keys[i].value;
+	}
+
+	for (int i = 0; i < m_buttons_len; i++)
+	{
+		m_buttons[i].update();
+		if (m_value == 0)
+			m_value = (float)m_buttons[i].value;
+	}
+
+	for (int i = 0; i < m_axes_len; i++)
+	{
+		m_axes[i].update();
+		if (m_value == 0)
+			m_value = m_axes[i].value;
+	}
+
+	//Valuei
+	m_last_value_i = m_value_i;
+	if (m_value > 0)
+		m_value_i = 1;
+	else if (m_value < 0)
+		m_value_i = -1;
+	else
+		m_value_i = 0;
+
+	//pressed?
+	m_pressed = false;
+	if (m_value_i != 0 && m_last_value_i != m_value_i)
+	{
+		m_pressed = true;
+		m_last_press_time = m_repeat_press_time = Time::elapsed;
+	}
+	else if (m_value_i == m_last_value_i && m_value_i != 0)
+	{
+		if (Time::elapsed - m_last_press_time <= m_press_buffer)
+			m_pressed = true;
+		else if (m_repeat_interval > 0 && Time::elapsed >= m_repeat_press_time + m_repeat_delay)
+		{
+			int prev = (int)((Time::previous_elapsed - m_repeat_press_time - m_repeat_delay) / m_repeat_interval);
+			int cur = (int)((Time::elapsed - m_repeat_press_time - m_repeat_delay) / m_repeat_interval);
+			m_pressed = prev < cur;
+		}
+	}
+
+	//released?
+	if (m_last_value_i != 0 && m_value_i != m_last_value_i)
+	{
+		m_released = true;
+		m_last_release_time = Time::elapsed;
+	}
+	else if (Time::elapsed - m_last_release_time <= m_release_buffer)
+		m_released = true;
+	else
+		m_released = false;
+}
+
+void VirtualAxis::KeysNode::init(Key negative, Key positive)
+{
+	this->negative = negative;
+	this->positive = positive;
+}
+
+void VirtualAxis::KeysNode::update()
+{
+	value = Input::axis_check(value, negative, positive);
+}
+
+void VirtualAxis::ButtonsNode::init(int gamepad_id, Button negative, Button positive)
+{
+	this->gamepad_id = gamepad_id;
+	this->negative = negative;
+	this->positive = positive;
+}
+
+void VirtualAxis::ButtonsNode::update()
+{
+	value = Input::axis_check(value, gamepad_id, negative, positive);
+}
+
+void VirtualAxis::AxisNode::init(int gamepad_id, Axis axis, float deadzone)
+{
+	this->gamepad_id = gamepad_id;
+	this->axis = axis;
+	this->deadzone = deadzone;
+}
+
+void VirtualAxis::AxisNode::update()
+{
+	value = Input::axis_check(gamepad_id, axis);
+	if (value < deadzone && value > -deadzone)
+		value = 0;
+}

src/input/virtual_button.cpp

@@ -0,0 +1,174 @@
+#include <blah/input/virtual_button.h>
+#include <blah/core/time.h>
+#include <blah/core/log.h>
+
+using namespace Blah;
+
+VirtualButton& VirtualButton::add_key(Key key)
+{
+	if (m_keys_len >= Input::max_virtual_nodes)
+		BLAH_ERROR("VirtualButton Keys out of bounds!");
+	else
+	{
+		m_keys[m_keys_len].init(key);
+		m_keys_len++;
+	}
+
+	return *this;
+}
+
+VirtualButton& VirtualButton::add_button(int gamepad_id, Button button)
+{
+	if (m_buttons_len >= Input::max_virtual_nodes)
+		BLAH_ERROR("VirtualButton Buttons out of bounds!");
+	else
+	{
+		m_buttons[m_buttons_len].init(gamepad_id, button);
+		m_buttons_len++;
+	}
+
+	return *this;
+}
+
+VirtualButton& VirtualButton::add_axis(int gamepad_id, Axis axis, float threshold, bool greater_than)
+{
+	if (m_axes_len >= Input::max_virtual_nodes)
+		BLAH_ERROR("VirtualButton Axes out of bounds!");
+	else
+	{
+		m_axes[m_axes_len].init(gamepad_id, axis, threshold, greater_than);
+		m_axes_len++;
+	}
+
+	return *this;
+}
+
+VirtualButton& VirtualButton::repeat(float m_repeat_delay, float m_repeat_interval)
+{
+	this->m_repeat_delay = m_repeat_delay;
+	this->m_repeat_interval = m_repeat_interval;
+	return *this;
+}
+
+VirtualButton& VirtualButton::press_buffer(float duration)
+{
+	this->m_press_buffer = duration;
+	return *this;
+}
+
+VirtualButton& VirtualButton::release_buffer(float duration)
+{
+	this->m_release_buffer = duration;
+	return *this;
+}
+
+void VirtualButton::update()
+{
+	m_down = false;
+	m_pressed = false;
+	m_released = false;
+
+	//Keys
+	for (int i = 0; i < m_keys_len; i++)
+	{
+		m_keys[i].update();
+
+		m_down = m_down || m_keys[i].down;
+		m_pressed = m_pressed || m_keys[i].pressed;
+		m_released = m_released || m_keys[i].released;
+	}
+
+	//Buttons
+	for (int i = 0; i < m_buttons_len; i++)
+	{
+		m_buttons[i].update();
+
+		m_down = m_down || m_buttons[i].down;
+		m_pressed = m_pressed || m_buttons[i].pressed;
+		m_released = m_released || m_buttons[i].released;
+	}
+
+	//Axes
+	for (int i = 0; i < m_axes_len; i++)
+	{
+		m_axes[i].update();
+
+		m_down = m_down || m_axes[i].down;
+		m_pressed = m_pressed || m_axes[i].pressed;
+		m_released = m_released || m_axes[i].released;
+	}
+
+	//pressed?
+	if (m_pressed)
+	{
+		m_repeat_press_time = m_last_press_time = Time::elapsed;
+	}
+	else if (Time::elapsed - m_last_press_time <= m_press_buffer)
+	{
+		m_pressed = true;
+	}
+	else if (m_down && m_repeat_interval > 0 && Time::elapsed >= m_repeat_press_time + m_repeat_delay)
+	{
+		int prev = (int)((Time::previous_elapsed - m_repeat_press_time - m_repeat_delay) / m_repeat_interval);
+		int cur = (int)((Time::elapsed - m_repeat_press_time - m_repeat_delay) / m_repeat_interval);
+		m_pressed = prev < cur;
+	}
+
+	//released?
+	if (m_released)
+		m_last_release_time = Time::elapsed;
+	else
+		m_released = Time::elapsed - m_last_release_time <= m_release_buffer;
+}
+
+void VirtualButton::KeyNode::init(Key key)
+{
+	this->key = key;
+}
+
+void VirtualButton::KeyNode::update()
+{
+	down = Input::down(key);
+	pressed = Input::pressed(key);
+	released = Input::released(key);
+}
+
+void VirtualButton::ButtonNode::init(int gamepad_id, Button button)
+{
+	this->gamepad_id = gamepad_id;
+	this->button = button;
+}
+
+void VirtualButton::ButtonNode::update()
+{
+	down = Input::down(gamepad_id, button);
+	pressed = Input::pressed(gamepad_id, button);
+	released = Input::released(gamepad_id, button);
+}
+
+void VirtualButton::AxisNode::init(int gamepad_id, Axis axis, float threshold, bool greater_than)
+{
+	this->gamepad_id = gamepad_id;
+	this->axis = axis;
+	this->threshold = threshold;
+	this->greater_than = greater_than;
+}
+
+void VirtualButton::AxisNode::update()
+{
+	float curr = Input::state()->controllers[gamepad_id].axis[(int)axis];
+	float prev = Input::last_state()->controllers[gamepad_id].axis[(int)axis];
+
+	if (greater_than)
+	{
+		down = curr >= threshold;
+		pressed = down && prev < threshold;
+		released = !down && prev >= threshold;
+	}
+	else
+	{
+		down = curr <= threshold;
+		pressed = down && prev > threshold;
+		released = !down && prev <= threshold;
+	}
+}

src/input/virtual_stick.cpp

@@ -0,0 +1,191 @@
+#include <blah/input/virtual_stick.h>
+#include <blah/core/time.h>
+#include <blah/core/log.h>
+
+using namespace Blah;
+
+VirtualStick::VirtualStick()
+{
+	this->m_i_deadzone = 0;
+}
+
+VirtualStick::VirtualStick(float iDeadzone)
+{
+	this->m_i_deadzone = iDeadzone;
+}
+
+VirtualStick& VirtualStick::add_keys(Key left, Key right, Key up, Key down)
+{
+	if (m_keys_len >= Input::max_virtual_nodes)
+		BLAH_ERROR("VirtualStick Keys out of bounds!");
+	else
+	{
+		m_keys[m_keys_len].init(left, right, up, down);
+		m_keys_len++;
+	}
+
+	return *this;
+}
+
+VirtualStick& VirtualStick::add_buttons(int gamepad_id, Button left, Button right, Button up, Button down)
+{
+	if (m_buttons_len >= Input::max_virtual_nodes)
+		BLAH_ERROR("VirtualStick Buttons out of bounds!");
+	else
+	{
+		m_buttons[m_buttons_len].init(gamepad_id, left, right, up, down);
+		m_buttons_len++;
+	}
+
+	return *this;
+}
+
+VirtualStick& VirtualStick::add_axes(int gamepad_id, Axis horizontal, Axis vertical, float deadzone)
+{
+	if (m_axes_len >= Input::max_virtual_nodes)
+		BLAH_ERROR("VirtualStick Axes out of bounds!");
+	else
+	{
+		m_axes[m_axes_len].init(gamepad_id, horizontal, vertical, deadzone);
+		m_axes_len++;
+	}
+
+	return *this;
+}
+
+VirtualStick& VirtualStick::repeat(float repeat_delay, float repeat_interval)
+{
+	this->m_repeat_delay = repeat_delay;
+	this->m_repeat_interval = repeat_interval;
+	return *this;
+}
+
+VirtualStick& VirtualStick::press_buffer(float duration)
+{
+	m_press_buffer = duration;
+	return *this;
+}
+
+VirtualStick& VirtualStick::release_buffer(float duration)
+{
+	m_release_buffer = duration;
+	return *this;
+}
+
+void VirtualStick::update()
+{
+	m_last_value = m_value;
+	m_value = Vec2::zero;
+
+	for (int i = 0; i < m_keys_len; i++)
+	{
+		m_keys[i].update();
+		if (m_value == Vec2::zero)
+			m_value = m_keys[i].value;
+	}
+
+	for (int i = 0; i < m_buttons_len; i++)
+	{
+		m_buttons[i].update();
+		if (m_value == Vec2::zero)
+			m_value = m_buttons[i].value;
+	}
+
+	for (int i = 0; i < m_axes_len; i++)
+	{
+		m_axes[i].update();
+		if (m_value == Vec2::zero)
+			m_value = m_axes[i].value;
+	}
+
+	//Valuei
+	m_last_value_i = m_value_i;
+	if (m_value.x > m_i_deadzone)
+		m_value_i.x = 1;
+	else if (m_value.x < -m_i_deadzone)
+		m_value_i.x = -1;
+	else
+		m_value_i.x = 0;
+	if (m_value.y > m_i_deadzone)
+		m_value_i.y = 1;
+	else if (m_value.y < -m_i_deadzone)
+		m_value_i.y = -1;
+	else
+		m_value_i.y = 0;
+
+	//pressed?
+	m_pressed = false;
+	if (m_value_i != Point::zero && m_last_value_i != m_value_i)
+	{
+		m_pressed = true;
+		m_last_press_time = m_repeat_press_time = Time::elapsed;
+	}
+	else if (m_value_i == m_last_value_i && m_value_i != Point::zero)
+	{
+		if (Time::elapsed - m_last_press_time <= m_press_buffer)
+			m_pressed = true;
+		else if (m_repeat_interval > 0 && Time::elapsed >= m_repeat_press_time + m_repeat_delay)
+		{
+			int prev = (int)((Time::previous_elapsed - m_repeat_press_time - m_repeat_delay) / m_repeat_interval);
+			int cur = (int)((Time::elapsed - m_repeat_press_time - m_repeat_delay) / m_repeat_interval);
+			m_pressed = prev < cur;
+		}
+	}
+
+	//released?
+	if (m_last_value_i != Point::zero && m_value_i != m_last_value_i)
+	{
+		m_released = true;
+		m_last_release_time = Time::elapsed;
+	}
+	else if (Time::elapsed - m_last_release_time <= m_release_buffer)
+		m_released = true;
+	else
+		m_released = false;
+}
+
+void VirtualStick::KeysNode::init(Key left, Key right, Key up, Key down)
+{
+	this->left = left;
+	this->right = right;
+	this->up = up;
+	this->down = down;
+}
+
+void VirtualStick::KeysNode::update()
+{
+	value.x = Input::axis_check(value.x, left, right);
+	value.y = Input::axis_check(value.y, up, down);
+}
+
+void VirtualStick::ButtonsNode::init(int gamepad_id, Button left, Button right, Button up, Button down)
+{
+	this->gamepad_id = gamepad_id;
+	this->left = left;
+	this->right = right;
+	this->up = up;
+	this->down = down;
+}
+
+void VirtualStick::ButtonsNode::update()
+{
+	value.x = Input::axis_check(value.x, gamepad_id, left, right);
+	value.y = Input::axis_check(value.y, gamepad_id, up, down);
+}
+
+void VirtualStick::AxesNode::init(int gamepad_id, Axis horizontal, Axis vertical, float deadzone)
+{
+	this->gamepad_id = gamepad_id;
+	this->horizontal = horizontal;
+	this->vertical = vertical;
+	this->deadzone = deadzone;
+}
+
+void VirtualStick::AxesNode::update()
+{
+	value.x = Input::axis_check(gamepad_id, horizontal);
+	value.y = Input::axis_check(gamepad_id, vertical);
+
+	if (value.length() < deadzone)
+		value = Vec2::zero;
+}

src/internal/graphics_backend.h

@@ -0,0 +1,60 @@
+#pragma once
+#include <blah/core/app.h>
+#include <blah/graphics/renderpass.h>
+#include <blah/graphics/texture.h>
+#include <blah/graphics/framebuffer.h>
+#include <blah/graphics/shader.h>
+#include <blah/graphics/mesh.h>
+#include <blah/graphics/material.h>
+#include <blah/math/color.h>
+
+namespace Blah
+{
+	// Graphics backend API used for rendering.
+	// All rendering ends up going through here.
+	namespace GraphicsBackend
+	{
+		// Initializes the graphics backend
+		bool init();
+
+		// Shuts down the graphics backend
+		void shutdown();
+
+		// Returns info about the renderer
+		const RendererFeatures& features();
+
+		// Returns the renderer type
+		Renderer renderer();
+
+		// Called once per frame
+		void frame();
+
+		// Called before rendering begins
+		void before_render();
+
+		// Called after renderings ends
+		void after_render();
+
+		// Performs a draw call
+		void render(const RenderPass& pass);
+
+		// Clears the backbuffer
+		void clear_backbuffer(Color color);
+
+		// Creates a new Texture.
+		// if the Texture is invalid, this should return an empty reference.
+		TextureRef create_texture(int width, int height, TextureFormat format);
+
+		// Creates a new FrameBuffer.
+		// if the FrameBuffer is invalid, this should return an empty reference.
+		FrameBufferRef create_framebuffer(int width, int height, const TextureFormat* attachments, int attachment_count);
+
+		// Creates a new Shader.
+		// if the Shader is invalid, this should return an empty reference.
+		ShaderRef create_shader(const ShaderData* data);
+
+		// Creates a new Mesh.
+		// if the Mesh is invalid, this should return an empty reference.
+		MeshRef create_mesh();
+	}
+}

src/internal/graphics_backend_dummy.cpp

@@ -0,0 +1,235 @@
+#if !(defined(BLAH_USE_OPENGL) || defined(BLAH_USE_D3D11))
+
+#include "../internal/graphics_backend.h"
+#include "../internal/platform_backend.h"
+#include <blah/core/log.h>
+
+namespace Blah
+{
+	class Dummy_Texture : public Texture
+	{
+	private:
+		int m_width;
+		int m_height;
+		TextureFormat m_format;
+		bool m_framebuffer;
+
+	public:
+
+		Dummy_Texture(int width, int height, TextureFormat format, bool framebuffer)
+		{
+			m_width = width;
+			m_height = height;
+			m_format = format;
+			m_framebuffer = framebuffer;
+		}
+
+		virtual int width() const override
+		{
+			return m_width;
+		}
+
+		virtual int height() const override
+		{
+			return m_height;
+		}
+
+		virtual TextureFormat format() const override
+		{
+			return m_format;
+		}
+
+		virtual void set_data(unsigned char* data) override
+		{
+
+		}
+
+		virtual void get_data(unsigned char* data) override
+		{
+
+		}
+
+		virtual bool is_framebuffer() const override
+		{
+			return m_framebuffer;
+		}
+
+	};
+
+	class Dummy_FrameBuffer : public FrameBuffer
+	{
+	private:
+		Attachments m_attachments;
+
+	public:
+
+		Dummy_FrameBuffer(int width, int height, const TextureFormat* attachments, int attachmentCount)
+		{
+			for (int i = 0; i < attachmentCount; i++)
+			{
+				m_attachments.push_back(
+					TextureRef(new Dummy_Texture(width, height, attachments[i], true))
+				);
+			}
+		}
+
+		virtual Attachments& attachments() override
+		{
+			return m_attachments;
+		}
+
+		virtual const Attachments& attachments() const override
+		{
+			return m_attachments;
+		}
+
+		virtual TextureRef& attachment(int index) override
+		{
+			return m_attachments[index];
+		}
+
+		virtual const TextureRef& attachment(int index) const override
+		{
+			return m_attachments[index];
+		}
+
+		virtual int width() const override
+		{
+			return m_attachments[0]->width();
+		}
+
+		virtual int height() const override
+		{
+			return m_attachments[0]->height();
+		}
+
+		virtual void clear(Color color) override
+		{
+
+		}
+	};
+
+	class Dummy_Shader : public Shader
+	{
+	private:
+		Vector<UniformInfo> m_uniforms;
+
+	public:
+		Dummy_Shader(const ShaderData* data)
+		{
+
+		}
+
+		virtual Vector<UniformInfo>& uniforms() override
+		{
+			return m_uniforms;
+		}
+
+		virtual const Vector<UniformInfo>& uniforms() const override
+		{
+			return m_uniforms;
+		}
+	};
+
+	class Dummy_Mesh : public Mesh
+	{
+	private:
+		int64_t m_index_count = 0;
+		int64_t m_vertex_count = 0;
+		int64_t m_instance_count = 0;
+	public:
+
+		Dummy_Mesh()
+		{
+
+		}
+
+		virtual void index_data(IndexFormat format, const void* indices, int64_t count) override
+		{
+			m_index_count = count;
+		}
+
+		virtual void vertex_data(const VertexFormat& format, const void* vertices, int64_t count) override
+		{
+			m_vertex_count = count;
+		}
+
+		virtual void instance_data(const VertexFormat& format, const void* instances, int64_t count) override
+		{
+			m_instance_count = count;
+		}
+
+		virtual int64_t index_count() const override
+		{
+			return m_index_count;
+		}
+
+		virtual int64_t vertex_count() const override
+		{
+			return m_vertex_count;
+		}
+
+		virtual int64_t instance_count() const override
+		{
+			return m_instance_count;
+		}
+	};
+
+	bool GraphicsBackend::init()
+	{
+		Log::print("Dummy Renderer");
+		return true;
+	}
+
+	Renderer GraphicsBackend::renderer()
+	{
+		return Renderer::None;
+	}
+
+	void GraphicsBackend::shutdown()
+	{
+
+	}
+
+	const RendererFeatures& GraphicsBackend::features()
+	{
+		static const RendererFeatures features { false, true, 4096 };
+		return features;
+	}
+
+	void GraphicsBackend::frame() {}
+	void GraphicsBackend::before_render() {}
+	void GraphicsBackend::after_render() {}
+
+	TextureRef GraphicsBackend::create_texture(int width, int height, TextureFormat format)
+	{
+		return TextureRef(new Dummy_Texture(width, height, format, false));
+	}
+
+	FrameBufferRef GraphicsBackend::create_framebuffer(int width, int height, const TextureFormat* attachments, int attachmentCount)
+	{
+		return FrameBufferRef(new Dummy_FrameBuffer(width, height, attachments, attachmentCount));
+	}
+
+	ShaderRef GraphicsBackend::create_shader(const ShaderData* data)
+	{
+		return ShaderRef(new Dummy_Shader(data));
+	}
+
+	MeshRef GraphicsBackend::create_mesh()
+	{
+		return MeshRef(new Dummy_Mesh());
+	}
+
+	void GraphicsBackend::render(const RenderPass& pass)
+	{
+
+	}
+
+	void GraphicsBackend::clear_backbuffer(Color color)
+	{
+
+	}
+}
+
+#endif // !(defined(BLAH_USE_OPENGL) || defined(BLAH_USE_D3D11))

src/internal/input_backend.h

@@ -0,0 +1,54 @@
+#pragma once
+#include <blah/input/input.h>
+
+namespace Blah
+{
+	namespace InputBackend
+	{
+		// This is called internally by the app, and initializes the input state
+		void init();
+
+		// This is called internally by the app, and updates the input state
+		void frame();
+
+		// Call this when the Mouse moves relative to the window
+		void on_mouse_move(float x, float y);
+
+		// Call this when the Mouse moves relative to the screen
+		void on_mouse_screen_move(float x, float y);
+
+		// Call this when a Mouse Button is pressed
+		void on_mouse_down(MouseButton button);
+
+		// Call this when a Mouse Button is released
+		void on_mouse_up(MouseButton button);
+
+		// Call this when the Mouse Wheel moves
+		void on_mouse_wheel(Point wheel);
+
+		// Call this when a keyboard key is pressed
+		void on_key_down(Key key);
+
+		// Call this when a keyboard key is released
+		void on_key_up(Key key);
+
+		// Call this on Text Input
+		void on_text_utf8(const char* text);
+
+		// Call this when a Controller is connected. Note that the Name parameter must be kept valid
+		// until on_controller_disconnect is called with the same index.
+		void on_controller_connect(int index, const char* name, int isGamepad, int buttonCount, int axisCount, uint16_t vendor, uint16_t product, uint16_t version);
+
+		// Call this when a controller is disconnected
+		void on_controller_disconnect(int index);
+
+		// Call this when a controller button is pressed
+		void on_button_down(int index, int button);
+
+		// Call this when a controller button is released
+		void on_button_up(int index, int button);
+
+		/// Call this when a controller axis is moved
+		void on_axis_move(int index, int axis, float value);
+	}
+}

src/internal/platform_backend.h

@@ -0,0 +1,120 @@
+#pragma once
+#include <inttypes.h>
+#include <blah/core/filesystem.h>
+#include <blah/containers/vector.h>
+
+namespace Blah
+{
+	struct Config;
+	enum class FileMode;
+
+	namespace PlatformBackend
+	{
+		typedef void* FileHandle;
+
+		// Initialize the System
+		bool init(const Config* config);
+
+		// Called after the on_startup callback, but before the update loop begins
+		void ready();
+
+		// Called during shutdown
+		void shutdown();
+
+		// The time, in milliseconds, since the Application was started
+		uint64_t time();
+
+		// Called every frame
+		void frame();
+
+		// Sleeps the current thread
+		void sleep(int milliseconds);
+
+		// Called to present the window contents
+		void present();
+
+		// Gets the Application Window Title in UTF-8
+		const char* get_title();
+
+		// Sets the Application Window Title in UTF-8
+		void set_title(const char* title);
+
+		// Gets the Application Window Position, in Screen Coordinates
+		void get_position(int* x, int* y);
+
+		// Sets the Application Window Position, in Screen Coordinates
+		void set_position(int x, int y);
+
+		// Sets the Window Fullscreen if enabled is not 0
+		void set_fullscreen(bool enabled);
+
+		// Gets the Application Window Size, in Screen Coordinates
+		void get_size(int* width, int* height);
+
+		// Sets the Application Window Size, in Screen Coordinates
+		void set_size(int width, int height);
+
+		// Gets the Application Window Drawing Size, in Pixels. This may differ from the Window Size on hi-dpi displays.
+		void get_draw_size(int* width, int* height);
+
+		// Gets the Desktop Content Scale. Gui should be scaled by this value
+		float get_content_scale();
+
+		// Returns the absoluate path to the directory that the application was started from
+		const char* app_path();
+
+		// Returns the absolute path to the user directory where save data and settings should be stored
+		const char* user_path();
+
+		// Returns true if a file with the given path exists
+		bool file_exists(const char* path);
+
+		// Returns true if a file with the given path was deleted
+		bool file_delete(const char* path);
+
+		// Returns true if a directory with the given path was successfully created
+		bool dir_create(const char* path);
+
+		// Returns true if a directory with the given path exists
+		bool dir_exists(const char* path);
+
+		// Returns true if a directory with the given path was deleted
+		bool dir_delete(const char* path);
+
+		// enumerates a directory and appends each file to the given list
+		void dir_enumerate(Vector<FilePath>& list, const char* path, bool recursive);
+
+		// opens a directory in the OS file explorer / finder
+		void dir_explore(const char* path);
+
+		// Opens a file and sets the handle. returns true if the file was successfully opened
+		bool file_open(const char* path, FileHandle* handle, FileMode mode);
+
+		// Returns the length of the file
+		int64_t file_length(FileHandle file);
+
+		// Returns the Position of the file
+		int64_t file_position(FileHandle file);
+
+		// Seeks the Position of the file and returns the new position from the start of the file
+		int64_t file_seek(FileHandle file, int64_t seekTo);
+
+		// Reads a specific number of elements of a given size from the file into ptr
+		int64_t file_read(FileHandle file, void* ptr, int64_t size);
+
+		// Writes a specific number of elements of the given size from ptr to the file
+		int64_t file_write(FileHandle file, const void* ptr, int64_t size);
+
+		// Closes a file
+		void file_close(FileHandle file);
+
+		// OpenGL Methods
+		void* gl_get_func(const char* name);
+		void* gl_context_create();
+		void gl_context_make_current(void* context);
+		void gl_context_destroy(void* context);
+
+		// D3D11 Methods
+		void* d3d11_get_hwnd();
+	}
+}

src/internal/platform_backend_sdl2.cpp

@@ -0,0 +1,660 @@
+#ifdef BLAH_USE_SDL2
+
+#include "../internal/platform_backend.h"
+#include "../internal/input_backend.h"
+#include "../internal/graphics_backend.h"
+#include <blah/input/input.h>
+#include <blah/core/app.h>
+#include <blah/core/filesystem.h>
+#include <blah/core/log.h>
+
+#include <SDL.h>
+#include <SDL_vulkan.h>
+#include <SDL_syswm.h>
+
+#if _WIN32
+// on Windows we're using the C++ <filesystem> API for now
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <winuser.h>	// for SetProcessDPIAware
+#include <filesystem>	// for File Reading/Writing
+#include <shellapi.h>	// for file explore
+namespace fs = std::filesystem;
+#else
+// on non-Windows we use POSIX standard file system stuff
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#endif
+
+using namespace Blah;
+
+namespace
+{
+	SDL_Window* window = nullptr;
+	SDL_Joystick* joysticks[Blah::Input::max_controllers];
+	SDL_GameController* gamepads[Blah::Input::max_controllers];
+	char* basePath = nullptr;
+	char* userPath = nullptr;
+	bool displayed = false;
+
+	void sdl_log(void* userdata, int category, SDL_LogPriority priority, const char* message)
+	{
+		if (priority <= SDL_LOG_PRIORITY_INFO)
+			Log::print(message);
+		else if (priority <= SDL_LOG_PRIORITY_WARN)
+			Log::warn(message);
+		else
+			Log::error(message);
+	}
+}
+
+bool PlatformBackend::init(const Config* config)
+{
+	// Required to call this for Windows
+	// I'm not sure why SDL2 doesn't do this on Windows automatically?
+#if _WIN32
+	SetProcessDPIAware();
+#endif
+
+	// TODO:
+	// control this via some kind of config flag
+	SDL_LogSetAllPriority(SDL_LOG_PRIORITY_VERBOSE);
+	SDL_LogSetOutputFunction(sdl_log, nullptr);
+
+	// Get SDL version
+	SDL_version version;
+	SDL_GetVersion(&version);
+	Log::print("SDL v%i.%i.%i", version.major, version.minor, version.patch);
+
+	// initialize SDL
+	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_EVENTS | SDL_INIT_JOYSTICK | SDL_INIT_GAMECONTROLLER) != 0)
+	{
+		Log::error("Failed to initialize SDL2");
+		return false;
+	}
+
+	int flags = SDL_WINDOW_ALLOW_HIGHDPI | SDL_WINDOW_HIDDEN | SDL_WINDOW_RESIZABLE;
+
+	// enable OpenGL
+	if (App::renderer() == Renderer::OpenGL)
+	{
+		flags |= SDL_WINDOW_OPENGL;
+
+		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
+		SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+		SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);
+		SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+
+		// TODO:
+		// This should be controlled via the gfx api somehow?
+		SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
+		SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
+		SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
+		SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 4);
+	}
+	// enable DirectX
+	else if (App::renderer() == Renderer::D3D11)
+	{
+
+	}
+
+	// create the window
+	window = SDL_CreateWindow(config->name, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, config->width, config->height, flags);
+	if (window == nullptr)
+	{
+		Log::error("Failed to create a Window");
+		return false;
+	}
+
+	// Scale Window to monitor for High DPI displays
+	// Other platforms do this automatically ... Windows we need to explitely do so
+#if _WIN32
+	{
+		// find the display index
+		int display = SDL_GetWindowDisplayIndex(window);
+		float ddpi, hdpi, vdpi;
+		if (SDL_GetDisplayDPI(display, &ddpi, &hdpi, &vdpi) == 0)
+		{
+			// scale the window up basesd on the display DPI
+			float hidpiRes = 96;
+			float dpi = (ddpi / hidpiRes);
+			if (dpi != 1)
+			{
+				SDL_DisplayMode mode;
+				SDL_GetDesktopDisplayMode(display, &mode);
+				SDL_SetWindowPosition(window, (int)(mode.w - config->width * dpi) / 2, (int)(mode.h - config->height * dpi) / 2);
+				SDL_SetWindowSize(window, (int)(config->width * dpi), (int)(config->height * dpi));
+			}
+		}
+	}
+#endif
+
+	// set window properties
+	SDL_SetWindowResizable(window, SDL_TRUE);
+	SDL_SetWindowMinimumSize(window, 256, 256);
+
+	return true;
+}
+
+void PlatformBackend::ready()
+{
+	// enable V-Sync
+	if (App::renderer() == Renderer::OpenGL)
+		SDL_GL_SetSwapInterval(1);
+}
+
+void PlatformBackend::shutdown()
+{
+	if (window != nullptr)
+		SDL_DestroyWindow(window);
+	window = nullptr;
+	displayed = false;
+
+	if (basePath != nullptr)
+		SDL_free(basePath);
+
+	if (userPath != nullptr)
+		SDL_free(userPath);
+
+	SDL_Quit();
+}
+
+uint64_t PlatformBackend::time()
+{
+	return (uint64_t)SDL_GetTicks();
+}
+
+void PlatformBackend::frame()
+{
+	// update the mouse every frame
+	{
+		int winX, winY, x, y;
+		SDL_GetWindowPosition(window, &winX, &winY);
+		SDL_GetGlobalMouseState(&x, &y);
+
+		InputBackend::on_mouse_move((float)(x - winX), (float)(y - winY));
+		InputBackend::on_mouse_screen_move((float)x, (float)y);
+	}
+
+	// poll normal events
+	SDL_Event event;
+	while (SDL_PollEvent(&event))
+	{
+		if (event.type == SDL_QUIT)
+		{
+			auto config = App::config();
+			if (config->on_exit_request != nullptr)
+				config->on_exit_request();
+		}
+		// Mouse
+		else if (event.type == SDL_MOUSEBUTTONDOWN)
+		{
+			MouseButton btn = MouseButton::None;
+			if (event.button.button == SDL_BUTTON_LEFT)
+				btn = MouseButton::Left;
+			else if (event.button.button == SDL_BUTTON_RIGHT)
+				btn = MouseButton::Right;
+			else if (event.button.button == SDL_BUTTON_MIDDLE)
+				btn = MouseButton::Middle;
+			InputBackend::on_mouse_down(btn);
+		}
+		else if (event.type == SDL_MOUSEBUTTONUP)
+		{
+			MouseButton btn = MouseButton::None;
+			if (event.button.button == SDL_BUTTON_LEFT)
+				btn = MouseButton::Left;
+			else if (event.button.button == SDL_BUTTON_RIGHT)
+				btn = MouseButton::Right;
+			else if (event.button.button == SDL_BUTTON_MIDDLE)
+				btn = MouseButton::Middle;
+			InputBackend::on_mouse_up(btn);
+		}
+		else if (event.type == SDL_MOUSEWHEEL)
+		{
+			InputBackend::on_mouse_wheel(Point(event.wheel.x, event.wheel.y));
+		}
+		// Keyboard
+		else if (event.type == SDL_KEYDOWN)
+		{
+			if (event.key.repeat == 0)
+				InputBackend::on_key_down((Key)event.key.keysym.scancode);
+		}
+		else if (event.type == SDL_KEYUP)
+		{
+			if (event.key.repeat == 0)
+				InputBackend::on_key_up((Key)event.key.keysym.scancode);
+		}
+		else if (event.type == SDL_TEXTINPUT)
+		{
+			InputBackend::on_text_utf8(event.text.text);
+		}
+		// Joystick Controller
+		else if (event.type == SDL_JOYDEVICEADDED)
+		{
+			Sint32 index = event.jdevice.which;
+
+			if (SDL_IsGameController(index) == SDL_FALSE)
+			{
+				SDL_Joystick* ptr = joysticks[index] = SDL_JoystickOpen(index);
+				const char* name = SDL_JoystickName(ptr);
+				int button_count = SDL_JoystickNumButtons(ptr);
+				int axis_count = SDL_JoystickNumAxes(ptr);
+				uint16_t vendor = SDL_JoystickGetVendor(ptr);
+				uint16_t product = SDL_JoystickGetProduct(ptr);
+				uint16_t version = SDL_JoystickGetProductVersion(ptr);
+
+				InputBackend::on_controller_connect(index, name, 0, button_count, axis_count, vendor, product, version);
+			}
+		}
+		else if (event.type == SDL_JOYDEVICEREMOVED)
+		{
+			Sint32 index = event.jdevice.which;
+
+			if (SDL_IsGameController(index) == SDL_FALSE)
+			{
+				InputBackend::on_controller_disconnect(index);
+				SDL_JoystickClose(joysticks[index]);
+			}
+		}
+		else if (event.type == SDL_JOYBUTTONDOWN)
+		{
+			Sint32 index = event.jdevice.which;
+			if (SDL_IsGameController(index) == SDL_FALSE)
+				InputBackend::on_button_down(index, event.jbutton.button);
+		}
+		else if (event.type == SDL_JOYBUTTONUP)
+		{
+			Sint32 index = event.jdevice.which;
+			if (SDL_IsGameController(index) == SDL_FALSE)
+				InputBackend::on_button_up(index, event.jbutton.button);
+		}
+		else if (event.type == SDL_JOYAXISMOTION)
+		{
+			Sint32 index = event.jaxis.which;
+			if (SDL_IsGameController(index) == SDL_FALSE)
+			{
+				float value;
+				if (event.jaxis.value >= 0)
+					value = event.jaxis.value / 32767.0f;
+				else
+					value = event.jaxis.value / 32768.0f;
+				InputBackend::on_axis_move(index, event.jaxis.axis, value);
+			}
+		}
+		// Gamepad Controller
+		else if (event.type == SDL_CONTROLLERDEVICEADDED)
+		{
+			Sint32 index = event.cdevice.which;
+			SDL_GameController* ptr = gamepads[index] = SDL_GameControllerOpen(index);
+			const char* name = SDL_GameControllerName(ptr);
+			uint16_t vendor = SDL_GameControllerGetVendor(ptr);
+			uint16_t product = SDL_GameControllerGetProduct(ptr);
+			uint16_t version = SDL_GameControllerGetProductVersion(ptr);
+
+			InputBackend::on_controller_connect(index, name, 1, 15, 6, vendor, product, version);
+		}
+		else if (event.type == SDL_CONTROLLERDEVICEREMOVED)
+		{
+			Sint32 index = event.cdevice.which;
+			InputBackend::on_controller_disconnect(index);
+			SDL_GameControllerClose(gamepads[index]);
+		}
+		else if (event.type == SDL_CONTROLLERBUTTONDOWN)
+		{
+			Sint32 index = event.cbutton.which;
+
+			int button = (int)Button::None;
+			if (event.cbutton.button >= 0 && event.cbutton.button < 15)
+				button = event.cbutton.button; // NOTE: These map directly to Engine Buttons enum!
+
+			InputBackend::on_button_down(index, button);
+		}
+		else if (event.type == SDL_CONTROLLERBUTTONUP)
+		{
+			Sint32 index = event.cbutton.which;
+
+			int button = (int)Button::None;
+			if (event.cbutton.button >= 0 && event.cbutton.button < 15)
+				button = event.cbutton.button; // NOTE: These map directly to Engine Buttons enum!
+
+			InputBackend::on_button_up(index, button);
+		}
+		else if (event.type == SDL_CONTROLLERAXISMOTION)
+		{
+			Sint32 index = event.caxis.which;
+
+			int axis = (int)Axis::None;
+			if (event.caxis.axis >= 0 && event.caxis.axis < 6)
+				axis = event.caxis.axis; // NOTE: These map directly to Engine Axis enum!
+
+			float value;
+			if (event.caxis.value >= 0)
+				value = event.caxis.value / 32767.0f;
+			else
+				value = event.caxis.value / 32768.0f;
+
+			InputBackend::on_axis_move(index, axis, value);
+		}
+	}
+}
+
+void PlatformBackend::sleep(int milliseconds)
+{
+	if (milliseconds >= 0)
+		SDL_Delay((uint32_t)milliseconds);
+}
+
+void PlatformBackend::present()
+{
+	if (App::renderer() == Renderer::OpenGL)
+	{
+		SDL_GL_SwapWindow(window);
+	}
+
+	// display the window
+	// this avoids a short black screen on macoS
+	if (!displayed)
+	{
+		SDL_ShowWindow(window);
+		displayed = true;
+	}
+}
+
+const char* PlatformBackend::get_title()
+{
+	return nullptr;
+}
+
+void PlatformBackend::set_title(const char* title)
+{
+	SDL_SetWindowTitle(window, title);
+}
+
+void PlatformBackend::get_position(int* x, int* y)
+{
+	SDL_GetWindowPosition(window, x, y);
+}
+
+void PlatformBackend::set_position(int x, int y)
+{
+	SDL_SetWindowPosition(window, x, y);
+}
+
+void PlatformBackend::set_fullscreen(bool enabled)
+{
+	if (enabled)
+		SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN_DESKTOP);
+	else
+		SDL_SetWindowFullscreen(window, 0);
+}
+
+void PlatformBackend::get_size(int* width, int* height)
+{
+	SDL_GetWindowSize(window, width, height);
+}
+
+void PlatformBackend::set_size(int width, int height)
+{
+	SDL_SetWindowSize(window, width, height);
+}
+
+void PlatformBackend::get_draw_size(int* width, int* height)
+{
+	if (App::renderer() == Renderer::OpenGL)
+	{
+		SDL_GL_GetDrawableSize(window, width, height);
+	}
+	else
+	{
+		SDL_GetWindowSize(window, width, height);
+	}
+}
+
+float PlatformBackend::get_content_scale()
+{
+	// TODO:
+	// This is incorrect! but for some reason the scale
+	// is HUGE if I use the Display DPI on macOS :/
+#if __APPLE__
+	return 2.0f;
+#endif
+
+#if _WIN32
+	float hidpiRes = 96;
+#else
+	float hidpiRes = 72;
+#endif
+
+	int index = SDL_GetWindowDisplayIndex(window);
+	if (index < 0)
+		Log::error(SDL_GetError());
+
+	float ddpi, x, y;
+	if (SDL_GetDisplayDPI(index, &ddpi, &x, &y) != 0)
+		Log::error(SDL_GetError());
+
+	return (ddpi / hidpiRes);
+}
+
+// FILE IO
+
+const char* PlatformBackend::app_path()
+{
+	if (basePath == nullptr)
+		basePath = SDL_GetBasePath();
+	return basePath;
+}
+
+const char* PlatformBackend::user_path()
+{
+	if (userPath == nullptr)
+	{
+		const Config* config = App::config();
+		userPath = SDL_GetPrefPath(nullptr, config->name);
+	}
+
+	return userPath;
+}
+
+// Windows File System methods
+#if _WIN32
+
+bool PlatformBackend::file_exists(const char* path)
+{
+	return fs::is_regular_file(path);
+}
+
+bool PlatformBackend::file_delete(const char* path)
+{
+	return fs::remove(path);
+}
+
+bool PlatformBackend::dir_create(const char* path)
+{
+	std::error_code error;
+	return fs::create_directories(path, error);
+}
+
+bool PlatformBackend::dir_exists(const char* path)
+{
+	return fs::is_directory(path);
+}
+
+bool PlatformBackend::dir_delete(const char* path)
+{
+	BLAH_ERROR("not implemented");
+	return false;
+}
+
+void PlatformBackend::dir_enumerate(Vector<FilePath>& list, const char* path, bool recursive)
+{
+	if (fs::is_directory(path))
+	{
+		if (recursive)
+		{
+			for (auto& p : fs::recursive_directory_iterator(path))
+				list.emplace_back(p.path().string().c_str());
+		}
+		else
+		{
+			for (auto& p : fs::directory_iterator(path))
+				list.emplace_back(p.path().string().c_str());
+		}
+	}
+}
+
+void PlatformBackend::dir_explore(const char* path)
+{
+	ShellExecute(NULL, "open", path, NULL, NULL, SW_SHOWDEFAULT);
+}
+
+// Non-Windows File System Methods
+#else
+
+bool PlatformBackend::file_exists(const char* path)
+{
+	struct stat buffer;
+	return (stat(path, &buffer) == 0) && S_ISREG(buffer.st_mode);
+}
+
+bool PlatformBackend::file_delete(const char* path)
+{
+	BLAH_ERROR("not implemented");
+	return false;
+}
+
+bool PlatformBackend::dir_create(const char* path)
+{
+	char tmp[265];
+	char* p = NULL;
+	size_t len;
+
+	snprintf(tmp, sizeof(tmp), "%s", path);
+	len = strlen(tmp);
+	if (tmp[len - 1] == '/')
+		tmp[len - 1] = 0;
+	for (p = tmp + 1; *p; p++)
+		if (*p == '/') {
+			*p = 0;
+			mkdir(tmp, S_IRWXU);
+			*p = '/';
+		}
+	return mkdir(tmp, S_IRWXU) == 0;
+}
+
+bool PlatformBackend::dir_exists(const char* path)
+{
+	struct stat buffer;
+	return (stat(path, &buffer) == 0) && S_ISDIR(buffer.st_mode);
+}
+
+bool PlatformBackend::dir_delete(const char* path)
+{
+	BLAH_ERROR("not implemented");
+	return false;
+}
+
+void PlatformBackend::dir_enumerate(Vector<FilePath>& list, const char* path, bool recursive)
+{
+	DIR* dirp = opendir(path);
+	if (dirp != NULL)
+	{
+		struct dirent* dp;
+		while ((dp = readdir(dirp)) != NULL)
+		{
+			if (dp->d_name[0] == '.')
+				continue;
+
+			FilePath subpath = FilePath(path).append(dp->d_name);
+			list.push_back(subpath);
+
+			if (recursive && dp->d_type == DT_DIR)
+				dir_enumerate(list, subpath + "/", true);
+		}
+		closedir(dirp);
+	}
+}
+
+void PlatformBackend::dir_explore(const char* path)
+{
+	BLAH_ERROR("'dir_explore' Not Implemented");
+}
+
+#endif
+
+bool PlatformBackend::file_open(const char* path, PlatformBackend::FileHandle* handle, FileMode mode)
+{
+	const char* sdlMode = "rb";
+	if (mode == FileMode::Write)
+		sdlMode = "wb";
+
+	auto ptr = SDL_RWFromFile(path, sdlMode);
+	*handle = (PlatformBackend::FileHandle)ptr;
+	return ptr != nullptr;
+}
+
+int64_t PlatformBackend::file_length(PlatformBackend::FileHandle stream)
+{
+	return SDL_RWsize((SDL_RWops*)stream);
+}
+
+int64_t PlatformBackend::file_position(PlatformBackend::FileHandle stream)
+{
+	return SDL_RWtell((SDL_RWops*)stream);
+}
+
+int64_t PlatformBackend::file_seek(PlatformBackend::FileHandle stream, int64_t seekTo)
+{
+	return SDL_RWseek((SDL_RWops*)stream, seekTo, RW_SEEK_SET);
+}
+
+int64_t PlatformBackend::file_read(PlatformBackend::FileHandle stream, void* ptr, int64_t length)
+{
+	return SDL_RWread((SDL_RWops*)stream, ptr, sizeof(char), length);
+}
+
+int64_t PlatformBackend::file_write(PlatformBackend::FileHandle stream, const void* ptr, int64_t length)
+{
+	return SDL_RWwrite((SDL_RWops*)stream, ptr, sizeof(char), length);
+}
+
+void PlatformBackend::file_close(PlatformBackend::FileHandle stream)
+{
+	if (stream != nullptr)
+		SDL_RWclose((SDL_RWops*)stream);
+}
+
+void* PlatformBackend::gl_get_func(const char* name)
+{
+	return SDL_GL_GetProcAddress(name);
+}
+
+void* PlatformBackend::gl_context_create()
+{
+	void* pointer = SDL_GL_CreateContext(window);
+	if (pointer == nullptr)
+		Log::error("SDL_GL_CreateContext failed: %s", SDL_GetError());
+	return pointer;
+}
+
+void PlatformBackend::gl_context_make_current(void* context)
+{
+	SDL_GL_MakeCurrent(window, context);
+}
+
+void PlatformBackend::gl_context_destroy(void* context)
+{
+	SDL_GL_DeleteContext(context);
+}
+
+void* PlatformBackend::d3d11_get_hwnd()
+{
+	SDL_SysWMinfo info;
+	SDL_VERSION(&info.version);
+	SDL_GetWindowWMInfo(window, &info);
+	return info.info.win.window;
+}
+
+#endif // BLAH_USE_SDL2

src/math/calc.cpp

@@ -0,0 +1,156 @@
+#include <blah/math/calc.h>
+#include <math.h>
+#include <stdlib.h>
+
+using namespace Blah;
+
+float Calc::rand_float(float min, float maxExc)
+{
+	return min + rand_float(maxExc - min);
+}
+
+float Calc::rand_float(float maxExc)
+{
+	return (rand() / (float)RAND_MAX) * maxExc;
+}
+
+int Calc::rand_int(int min, int maxExc)
+{
+	return min + rand_int(maxExc - min);
+}
+
+int Calc::rand_int(int maxExc)
+{
+	if (maxExc <= 0)
+		return 0;
+	return rand() % maxExc;
+}
+
+int Calc::rand_int()
+{
+	return rand();
+}
+
+float Calc::approach(float t, float target, float maxDelta)
+{
+	return t < target ? min(t + maxDelta, target) : max(t - maxDelta, target);
+}
+
+float Calc::clamp(float t, float min, float max)
+{
+	return t < min ? min : (t > max ? max : t);
+}
+
+int Calc::clamp_int(int t, int min, int max)
+{
+	return t < min ? min : (t > max ? max : t);
+}
+
+float Calc::map(float t, float old_min, float old_max, float new_min, float new_max)
+{
+	return new_min + ((t - old_min) / (old_max - old_min)) * (new_max - new_min);
+}
+
+float Calc::clamped_map(float t, float old_min, float old_max, float new_min, float new_max)
+{
+	return map(Calc::clamp(t, old_min, old_max), old_min, old_max, new_min, new_max);
+}
+
+int Calc::sign(int x)
+{
+	return (x < 0 ? -1 : (x > 0 ? 1 : 0));
+}
+
+float Calc::sign(float x)
+{
+	return (x < 0 ? -1.0f : (x > 0 ? 1.0f : 0.0f));
+}
+
+int Calc::abs(int x)
+{
+	return x < 0 ? -x : x;
+}
+
+float Calc::abs(float x)
+{
+	return x < 0 ? -x : x;
+}
+
+float Calc::round(float x)
+{
+	return roundf(x);
+}
+
+float Calc::floor(float x)
+{
+	return floorf(x);
+}
+
+float Calc::ceiling(float x)
+{
+	return ceilf(x);
+}
+
+float Calc::mod(float x, float m)
+{
+	return x - (int)(x / m) * m;
+}
+
+float Calc::sin(float x)
+{
+	return sinf(x);
+}
+
+float Calc::cos(float x)
+{
+	return cosf(x);
+}
+
+float Calc::atan2(float y, float x)
+{
+	return atan2f(y, x);
+}
+
+float Calc::pow(float x, float n)
+{
+	return powf(x, n);
+}
+
+float Calc::sqrt(float x)
+{
+	return sqrtf(x);
+}
+
+float Calc::snap(float val, float interval)
+{
+	if (val > 0)
+		return ((int)((val + interval / 2) / interval)) * interval;
+	else
+		return ((int)((val - interval / 2) / interval)) * interval;
+}
+
+float Calc::angle_diff(float radians_a, float radians_b)
+{
+	return mod((radians_b - radians_a) + PI, TAU) - PI;
+}
+
+float Calc::angle_lerp(float radians_a, float radians_b, float p)
+{
+	const auto shortest_angle = mod(mod(radians_b - radians_a, TAU) + (TAU + PI), TAU) - PI;
+	return radians_a + mod(shortest_angle * p, TAU);
+}
+
+float Calc::lerp(float a, float b, float t)
+{
+	return a + (b - a) * t;
+}
+
+bool Calc::is_big_endian()
+{
+	return (*((short*)"AB") == 0x4243);
+}
+
+bool Calc::is_little_endian()
+{
+	return (*((short*)"AB") != 0x4243);
+}

src/math/circle.cpp

@@ -0,0 +1,11 @@
+#include <blah/math/circle.h>
+#include <blah/math/calc.h>
+
+using namespace Blah;
+
+
+void Circle::project(const Vec2& axis, float* min, float* max) const
+{
+	*min = Vec2::dot(center - axis * radius, axis);
+	*max = Vec2::dot(center + axis * radius, axis);
+}

src/math/color.cpp

@@ -0,0 +1,156 @@
+#include <blah/math/color.h>
+#include <blah/math/vec4.h>
+
+using namespace Blah;
+
+char const hex[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
+#define LT_HEX_VALUE(n) ((n >= '0' && n <= '9') ? (n - '0') : ((n >= 'A' && n <= 'F') ? (10 + n - 'A') : ((n >= 'a' && n <= 'f') ? (10 + n - 'a') : 0)))
+
+Color::Color()
+	: r(0), g(0), b(0), a(0) {}
+
+Color::Color(int rgb) :
+	r((uint8_t)((rgb & 0xFF0000) >> 16)),
+	g((uint8_t)((rgb & 0x00FF00) >> 8)),
+	b((uint8_t)(rgb & 0x0000FF)),
+	a(255) {}
+
+Color::Color(int rgb, float alpha) :
+	r((int)(((uint8_t)((rgb & 0xFF0000) >> 16)) * alpha)),
+	g((int)(((uint8_t)((rgb & 0x00FF00) >> 8)) * alpha)),
+	b((int)(((uint8_t)(rgb & 0x0000FF)) * alpha)),
+	a((int)(255 * alpha)) {}
+
+Color::Color(uint8_t r, uint8_t g, uint8_t b)
+	: r(r), g(g), b(b), a(255) {}
+
+Color::Color(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
+	: r(r), g(g), b(b), a(a) {}
+
+Color::Color(const char* value) : r(0), g(0), b(0), a(255)
+{
+	int length = 0;
+	while (value[length] != '\0' && length < 10)
+		length ++;
+
+	int offset = 0;
+	if (length > 0 && value[0] == '#')
+		offset = 1;
+	else if (length >= 1 && value[0] == '0' && (value[1] == 'x' || value[1] == 'X'))
+		offset = 2;
+
+	if (length - offset >= 8)
+		a = (LT_HEX_VALUE(value[offset + 6]) << 4) + LT_HEX_VALUE(value[offset + 7]);
+
+	if (length - offset >= 6)
+	{
+		r = (LT_HEX_VALUE(value[offset + 0]) << 4) + LT_HEX_VALUE(value[offset + 1]);
+		g = (LT_HEX_VALUE(value[offset + 2]) << 4) + LT_HEX_VALUE(value[offset + 3]);
+		b = (LT_HEX_VALUE(value[offset + 4]) << 4) + LT_HEX_VALUE(value[offset + 5]);
+	}
+}
+
+void Color::premultiply()
+{
+	r = r * a / 255;
+	g = g * a / 255;
+	b = b * a / 255;
+}
+
+uint32_t Color::to_rgba() const
+{
+	return
+		((uint32_t)r << 24) |
+		((uint32_t)g << 16) |
+		((uint32_t)b << 8) |
+		(uint32_t)a;
+}
+
+Vec4 Color::to_vec4() const
+{
+	return Vec4(r / 255.0f, g / 255.0f, b / 255.0f, a / 255.0f);
+}
+
+void Color::to_hex_rgba(char* buffer) const
+{
+	buffer[0] = hex[(r & 0xF0) >> 4];
+	buffer[1] = hex[(r & 0x0F) >> 0];
+	buffer[2] = hex[(g & 0xF0) >> 4];
+	buffer[3] = hex[(g & 0x0F) >> 0];
+	buffer[4] = hex[(b & 0xF0) >> 4];
+	buffer[5] = hex[(b & 0x0F) >> 0];
+	buffer[6] = hex[(a & 0xF0) >> 4];
+	buffer[7] = hex[(a & 0x0F) >> 0];
+}
+
+void Color::to_hex_rgb(char* buffer) const
+{
+	buffer[0] = hex[(r & 0xF0) >> 4];
+	buffer[1] = hex[(r & 0x0F) >> 0];
+	buffer[2] = hex[(g & 0xF0) >> 4];
+	buffer[3] = hex[(g & 0x0F) >> 0];
+	buffer[4] = hex[(b & 0xF0) >> 4];
+	buffer[5] = hex[(b & 0x0F) >> 0];
+}
+
+Color Color::from_rgba(uint32_t value)
+{
+	return
+	{
+		(uint8_t)((value & 0xFF000000) >> 24),
+		(uint8_t)((value & 0x00FF0000) >> 16),
+		(uint8_t)((value & 0x0000FF00) >> 8),
+		(uint8_t)((value & 0x000000FF))
+	};
+}
+
+Color Color::from_rgb(uint32_t value)
+{
+	return
+	{
+		(uint8_t)((value & 0xFF0000) >> 16),
+		(uint8_t)((value & 0x00FF00) >> 8),
+		(uint8_t)((value & 0x0000FF))
+	};
+}
+
+Color Color::lerp(Color a, Color b, float amount)
+{
+	if (amount < 0) amount = 0;
+	if (amount > 1) amount = 1;
+
+	return Color(
+		(uint8_t)(a.r + (b.r - a.r) * amount),
+		(uint8_t)(a.g + (b.g - a.g) * amount),
+		(uint8_t)(a.b + (b.b - a.b) * amount),
+		(uint8_t)(a.a + (b.a - a.a) * amount)
+	);
+}
+
+Color Color::operator*(float multiply) const
+{
+	return Color(
+		(int)(r * multiply),
+		(int)(g * multiply),
+		(int)(b * multiply),
+		(int)(a * multiply));
+}
+
+Color& Color::operator= (const int rgb)
+{
+	r = (uint8_t)((rgb & 0xFF0000) >> 16);
+	g = (uint8_t)((rgb & 0x00FF00) >> 8);
+	b = (uint8_t)(rgb & 0x0000FF);
+	a = 255;
+	return *this;
+}
+
+const Color Color::transparent = Color(0, 0, 0, 0);
+const Color Color::white = Color(255, 255, 255, 255);
+const Color Color::black = Color(0, 0, 0, 255);
+const Color Color::red = Color(255, 0, 0, 255);
+const Color Color::green = Color(0, 255, 0, 255);
+const Color Color::blue = Color(0, 0, 255, 255);
+const Color Color::yellow = Color(255, 255, 0, 255);
+const Color Color::purple = Color(255, 0, 255, 255);
+const Color Color::teal = Color(0, 255, 255, 255);

src/math/line.cpp

@@ -0,0 +1,157 @@
+#include <blah/math/line.h>
+#include <blah/math/rect.h>
+#include <blah/math/vec2.h>
+#include <blah/math/calc.h>
+
+using namespace Blah;
+
+Line::Line(float x0, float y0, float x1, float y1)
+{
+	a.x = x0;
+	a.y = y0;
+	b.x = x1;
+	b.y = y1;
+}
+
+Line::Line(const Vec2& start, const Vec2& end)
+	: a(start), b(end) {}
+
+Rect Line::bounds() const
+{
+	Vec2 pos = Vec2(Calc::min(a.x, b.x), Calc::min(a.y, b.y));
+
+	return Rect(
+		pos,
+		Vec2(Calc::max(a.x, b.x) - pos.x, Calc::max(a.y, b.y) - pos.y)
+	);
+}
+
+Vec2 Line::closest_point(const Vec2& pt) const
+{
+	Vec2 v = b - a;
+	Vec2 w = pt - a;
+	float t = Vec2::dot(w, v) / Vec2::dot(v, v);
+	t = Calc::clamp(t, 0, 1);
+
+	return v * t + a;
+}
+
+bool Line::intersects(const Rect& rect) const
+{
+	char ca = rect.get_sector(a);
+	char cb = rect.get_sector(b);
+
+	if (ca == cb || (ca & cb) != 0)
+		return false;
+
+	char both = ca | cb;
+
+	// top
+	if ((both & 0b0100) != 0 && intersects(rect.top_line()))
+		return true;
+
+	// bottom
+	if ((both & 0b1000) != 0 && intersects(rect.bottom_line()))
+		return true;
+
+	// left
+	if ((both & 0b0001) != 0 && intersects(rect.left_line()))
+		return true;
+
+	// right
+	if ((both & 0b0010) != 0 && intersects(rect.right_line()))
+		return true;
+
+	return false;
+}
+
+bool Line::intersects(const Rect& rect, Vec2* out_intersection_point) const
+{
+	char ca = rect.get_sector(a);
+	char cb = rect.get_sector(b);
+
+	if (ca == cb || (ca & cb) != 0)
+		return false;
+
+	char both = ca | cb;
+
+	// top
+	if ((both & 0b0100) != 0 && intersects(rect.top_line(), out_intersection_point))
+		return true;
+
+	// bottom
+	if ((both & 0b1000) != 0 && intersects(rect.bottom_line(), out_intersection_point))
+		return true;
+
+	// left
+	if ((both & 0b0001) != 0 && intersects(rect.left_line(), out_intersection_point))
+		return true;
+
+	// right
+	if ((both & 0b0010) != 0 && intersects(rect.right_line(), out_intersection_point))
+		return true;
+
+	return false;
+}
+
+bool Line::intersects(const Line& line) const
+{
+	Vec2 e = b - a;
+	Vec2 d = line.b - line.a;
+	float e_dot_d_perp = e.x * d.y - e.y * d.x;
+
+	// if e dot d == 0, it means the lines are parallel
+	// so have infinite intersection points
+	if (e_dot_d_perp < 0.0001 && e_dot_d_perp > -0.0001)
+		return false;
+
+	Vec2 c = line.a - a;
+	float t = (c.x * d.y - c.y * d.x) / e_dot_d_perp;
+	if (t < 0 || t > 1)
+		return false;
+
+	float u = (c.x * e.y - c.y * e.x) / e_dot_d_perp;
+	if (u < 0 || u > 1)
+		return false;
+
+	return true;
+}
+
+bool Line::intersects(const Line& line, Vec2* intersection_point) const
+{
+	Vec2 e = b - a;
+	Vec2 d = line.b - line.a;
+	float e_dot_d_perp = e.x * d.y - e.y * d.x;
+
+	// if e dot d == 0, it means the lines are parallel
+	// so have infinite intersection points
+	if (e_dot_d_perp < 0.0001 && e_dot_d_perp > -0.0001)
+		return false;
+
+	Vec2 c = line.a - a;
+	float t = (c.x * d.y - c.y * d.x) / e_dot_d_perp;
+	if (t < 0 || t > 1)
+		return false;
+
+	float u = (c.x * e.y - c.y * e.x) / e_dot_d_perp;
+	if (u < 0 || u > 1)
+		return false;
+
+	Vec2 i = (e * t) + a;
+	intersection_point->x = i.x;
+	intersection_point->y = i.y;
+	return true;
+}
+
+void Line::project(const Vec2& axis, float* min, float* max) const
+{
+	float dot = a.x * axis.x + a.y * axis.y;
+	*min = dot;
+	*max = dot;
+	dot = b.x * axis.x + b.y * axis.y;
+	*min = Calc::min(dot, *min);
+	*max = Calc::max(dot, *max);
+}
+
+Line Line::operator +(const Vec2& rhs) const { return Line(a + rhs, b + rhs); }
+Line Line::operator -(const Vec2& rhs) const { return Line(a - rhs, b - rhs); }

src/math/mat3x2.cpp

@@ -0,0 +1,187 @@
+#include <blah/math/mat3x2.h>
+#include <blah/math/vec2.h>
+#include <string.h>
+#include <math.h>
+
+using namespace Blah;
+
+Mat3x2::Mat3x2()
+	: m11(0), m12(0), m21(0), m22(0), m31(0), m32(0) {}
+
+Mat3x2::Mat3x2(float m11, float m12, float m21, float m22, float m31, float m32)
+	: m11(m11), m12(m12), m21(m21), m22(m22), m31(m31), m32(m32) {}
+
+Mat3x2 Mat3x2::invert() const
+{
+	auto det = (m11 * m22) - (m21 * m12);
+	auto invDet = 1.0f / det;
+
+	return Mat3x2
+	{
+		m22 * invDet,
+		-m12 * invDet,
+		-m21 * invDet,
+		m11 * invDet,
+		(m21 * m32 - m31 * m22) * invDet,
+		(m31 * m12 - m11 * m32) * invDet
+	};
+}
+
+float Mat3x2::scaling_factor() const
+{
+	return (float)sqrt((double)m11 * m11 + (double)m12 * m12);
+}
+
+const Mat3x2 Mat3x2::identity = Mat3x2(1, 0, 0, 1, 0, 0);
+
+Mat3x2 Mat3x2::operator *(const Mat3x2& rhs) const { return multiply(*this, rhs); }
+Mat3x2 Mat3x2::operator +(const Mat3x2& rhs) const { return add(*this, rhs); }
+Mat3x2 Mat3x2::operator -(const Mat3x2& rhs) const { return subtract(*this, rhs); }
+
+Mat3x2& Mat3x2::operator*=(const Mat3x2& rhs)
+{
+	*this = multiply(*this, rhs);
+	return *this;
+}
+
+bool Mat3x2::operator ==(const Mat3x2& rhs)
+{
+	return memcmp(this, &rhs, sizeof(Mat3x2));
+}
+
+bool Mat3x2::operator !=(const Mat3x2& rhs)
+{
+	return !(*this == rhs);
+}
+
+Mat3x2 Mat3x2::create_translation(const Vec2& Vec2)
+{
+	return create_translation(Vec2.x, Vec2.y);
+}
+
+Mat3x2 Mat3x2::create_translation(float x, float y)
+{
+	return Mat3x2(1, 0, 0, 1, x, y);
+}
+
+Mat3x2 Mat3x2::create_scale(float scale)
+{
+	return create_scale(scale, scale);
+}
+
+Mat3x2 Mat3x2::create_scale(Vec2 Vec2)
+{
+	return create_scale(Vec2.x, Vec2.y);
+}
+
+Mat3x2 Mat3x2::create_scale(float x, float y)
+{
+	return Mat3x2(x, 0, 0, y, 0, 0);
+}
+
+Mat3x2 Mat3x2::create_scale(float scale, Vec2 centerPoint)
+{
+	Mat3x2 result;
+
+	float tx = centerPoint.x * (1 - scale);
+	float ty = centerPoint.y * (1 - scale);
+
+	result.m11 = scale;
+	result.m12 = 0.0f;
+	result.m21 = 0.0f;
+	result.m22 = scale;
+	result.m31 = tx;
+	result.m32 = ty;
+
+	return result;
+}
+
+Mat3x2 Mat3x2::create_scale(Vec2 scale, Vec2 centerPoint)
+{
+	Mat3x2 result;
+
+	float tx = centerPoint.x * (1 - scale.x);
+	float ty = centerPoint.y * (1 - scale.y);
+
+	result.m11 = scale.x;
+	result.m12 = 0.0f;
+	result.m21 = 0.0f;
+	result.m22 = scale.y;
+	result.m31 = tx;
+	result.m32 = ty;
+
+	return result;
+}
+
+Mat3x2 Mat3x2::create_scale(float scaleX, float scaleY, Vec2 centerPoint)
+{
+	Mat3x2 result;
+
+	float tx = centerPoint.x * (1 - scaleX);
+	float ty = centerPoint.y * (1 - scaleY);
+
+	result.m11 = scaleX;
+	result.m12 = 0.0f;
+	result.m21 = 0.0f;
+	result.m22 = scaleY;
+	result.m31 = tx;
+	result.m32 = ty;
+
+	return result;
+}
+
+Mat3x2 Mat3x2::create_rotation(float radians)
+{
+	float c = cosf(radians);
+	float s = sinf(radians);
+
+	return Mat3x2(c, s, -s, c, 0, 0);
+}
+
+Mat3x2 Mat3x2::create_transform(const Vec2& position, const Vec2& origin, const Vec2& scale, float rotation)
+{
+	Mat3x2 matrix = identity;
+
+	if (origin.x != 0 || origin.y != 0)
+		matrix = create_translation(-origin.x, -origin.y);
+	if (scale.x != 1 || scale.y != 1)
+		matrix = matrix * create_scale(scale);
+	if (rotation != 0)
+		matrix = matrix * create_rotation(rotation);
+	if (position.x != 0 || position.y != 0)
+		matrix = matrix * create_translation(position);
+	
+	return matrix;
+}
+
+Mat3x2 Mat3x2::add(const Mat3x2& a, const Mat3x2& b)
+{
+	return Mat3x2(
+		a.m11 + b.m11,
+		a.m12 + b.m12,
+		a.m21 + b.m21,
+		a.m22 + b.m22,
+		a.m31 + b.m31,
+		a.m32 + b.m32);
+}
+
+Mat3x2 Mat3x2::subtract(const Mat3x2& a, const Mat3x2& b)
+{
+	return Mat3x2(
+		a.m11 - b.m11,
+		a.m12 - b.m12,
+		a.m21 - b.m21,
+		a.m22 - b.m22,
+		a.m31 - b.m31,
+		a.m32 - b.m32);
+}
+
+Mat3x2 Mat3x2::multiply(const Mat3x2& a, const Mat3x2& b)
+{
+	return Mat3x2(a.m11 * b.m11 + a.m12 * b.m21,
+		a.m11 * b.m12 + a.m12 * b.m22,
+		a.m21 * b.m11 + a.m22 * b.m21,
+		a.m21 * b.m12 + a.m22 * b.m22,
+		a.m31 * b.m11 + a.m32 * b.m21 + b.m31,
+		a.m31 * b.m12 + a.m32 * b.m22 + b.m32);
+}

src/math/mat4x4.cpp

@@ -0,0 +1,109 @@
+#include <blah/math/mat4x4.h>
+
+using namespace Blah;
+
+Mat4x4::Mat4x4() :
+	m11(0.0f), m12(0.0f), m13(0.0f), m14(0.0f),
+	m21(0.0f), m22(0.0f), m23(0.0f), m24(0.0f),
+	m31(0.0f), m32(0.0f), m33(0.0f), m34(0.0f),
+	m41(0.0f), m42(0.0f), m43(0.0f), m44(0.0f) {}
+
+Mat4x4::Mat4x4(
+	float m11, float m12, float m13, float m14,
+	float m21, float m22, float m23, float m24,
+	float m31, float m32, float m33, float m34,
+	float m41, float m42, float m43, float m44) :
+	m11(m11), m12(m12), m13(m13), m14(m14),
+	m21(m21), m22(m22), m23(m23), m24(m24),
+	m31(m31), m32(m32), m33(m33), m34(m34),
+	m41(m41), m42(m42), m43(m43), m44(m44) {}
+
+const Mat4x4 Mat4x4::identity = Mat4x4(
+	1.0f, 0.0f, 0.0f, 0.0f,
+	0.0f, 1.0f, 0.0f, 0.0f,
+	0.0f, 0.0f, 1.0f, 0.0f,
+	0.0f, 0.0f, 0.0f, 1.0f);
+
+Mat4x4 Mat4x4::create_ortho(float width, float height, float z_near_plane, float z_far_plane)
+{
+	Mat4x4 result = identity;
+
+	result.m11 = 2.0f / width;
+	result.m12 = result.m13 = result.m14 = 0.0f;
+	result.m22 = -2.0f / height;
+	result.m21 = result.m23 = result.m24 = 0.0f;
+	result.m33 = 1.0f / (z_near_plane - z_far_plane);
+	result.m31 = result.m32 = result.m34 = 0.0f;
+	result.m41 = result.m42 = 0.0f;
+	result.m43 = z_near_plane / (z_near_plane - z_far_plane);
+	result.m44 = 1.0f;
+
+	return result;
+}
+
+Mat4x4 Mat4x4::create_ortho_offcenter(float left, float right, float bottom, float top, float z_near_plane, float z_far_plane)
+{
+	Mat4x4 result = identity;
+
+	result.m11 = 2.0f / (right - left);
+	result.m12 = result.m13 = result.m14 = 0.0f;
+	result.m22 = 2.0f / (top - bottom);
+	result.m21 = result.m23 = result.m24 = 0.0f;
+	result.m33 = 1.0f / (z_near_plane - z_far_plane);
+	result.m31 = result.m32 = result.m34 = 0.0f;
+	result.m41 = (left + right) / (left - right);
+	result.m42 = (top + bottom) / (bottom - top);
+	result.m43 = z_near_plane / (z_near_plane - z_far_plane);
+	result.m44 = 1.0f;
+
+	return result;
+}
+
+Mat4x4 Mat4x4::create_translation(float x, float y, float z)
+{
+	Mat4x4 result = identity;
+
+	result.m41 = x;
+	result.m42 = y;
+	result.m43 = z;
+
+	return result;
+}
+
+Mat4x4 Mat4x4::create_scale(float x, float y, float z)
+{
+	Mat4x4 result = identity;
+
+	result.m11 = x;
+	result.m22 = y;
+	result.m33 = z;
+
+	return result;
+}
+
+Mat4x4 Mat4x4::operator*(const Mat4x4& rhs)
+{
+	Mat4x4 m;
+
+	m.m11 = m11 * rhs.m11 + m12 * rhs.m21 + m13 * rhs.m31 + m14 * rhs.m41;
+	m.m12 = m11 * rhs.m12 + m12 * rhs.m22 + m13 * rhs.m32 + m14 * rhs.m42;
+	m.m13 = m11 * rhs.m13 + m12 * rhs.m23 + m13 * rhs.m33 + m14 * rhs.m43;
+	m.m14 = m11 * rhs.m14 + m12 * rhs.m24 + m13 * rhs.m34 + m14 * rhs.m44;
+
+	m.m21 = m21 * rhs.m11 + m22 * rhs.m21 + m23 * rhs.m31 + m24 * rhs.m41;
+	m.m22 = m21 * rhs.m12 + m22 * rhs.m22 + m23 * rhs.m32 + m24 * rhs.m42;
+	m.m23 = m21 * rhs.m13 + m22 * rhs.m23 + m23 * rhs.m33 + m24 * rhs.m43;
+	m.m24 = m21 * rhs.m14 + m22 * rhs.m24 + m23 * rhs.m34 + m24 * rhs.m44;
+
+	m.m31 = m31 * rhs.m11 + m32 * rhs.m21 + m33 * rhs.m31 + m34 * rhs.m41;
+	m.m32 = m31 * rhs.m12 + m32 * rhs.m22 + m33 * rhs.m32 + m34 * rhs.m42;
+	m.m33 = m31 * rhs.m13 + m32 * rhs.m23 + m33 * rhs.m33 + m34 * rhs.m43;
+	m.m34 = m31 * rhs.m14 + m32 * rhs.m24 + m33 * rhs.m34 + m34 * rhs.m44;
+
+	m.m41 = m41 * rhs.m11 + m42 * rhs.m21 + m43 * rhs.m31 + m44 * rhs.m41;
+	m.m42 = m41 * rhs.m12 + m42 * rhs.m22 + m43 * rhs.m32 + m44 * rhs.m42;
+	m.m43 = m41 * rhs.m13 + m42 * rhs.m23 + m43 * rhs.m33 + m44 * rhs.m43;
+	m.m44 = m41 * rhs.m14 + m42 * rhs.m24 + m43 * rhs.m34 + m44 * rhs.m44;
+
+	return m;
+}

src/math/point.cpp

@@ -0,0 +1,51 @@
+#include <blah/math/vec2.h>
+#include <blah/math/mat3x2.h>
+#include <math.h>
+
+using namespace Blah;
+
+Point::Point()
+{
+	x = y = 0;
+}
+
+Point::Point(int px, int py)
+{
+	x = px;
+	y = py;
+}
+
+Point Point::operator +(const Point rhs) const { return Point(x + rhs.x, y + rhs.y); }
+Point Point::operator -(const Point rhs) const { return Point(x - rhs.x, y - rhs.y); }
+Point Point::operator /(const int rhs) const { return Point(x / rhs, y / rhs); }
+Point Point::operator *(const int rhs) const { return Point(x * rhs, y * rhs); }
+Point Point::operator-() const { return Point(-x, -y); }
+
+Point& Point::operator +=(const Point& rhs) { x += rhs.x; y += rhs.y; return *this; }
+Point& Point::operator -=(const Point& rhs) { x -= rhs.x; y -= rhs.y; return *this; }
+Point& Point::operator /=(const Point& rhs) { x /= rhs.x; y /= rhs.y; return *this; }
+Point& Point::operator *=(const Point& rhs) { x *= rhs.x; y *= rhs.y; return *this; }
+Point& Point::operator /=(int rhs) { x /= rhs; y /= rhs; return *this; }
+Point& Point::operator *=(int rhs) { x *= rhs; y *= rhs; return *this; }
+
+bool Point::operator ==(const Point& rhs) { return x == rhs.x && y == rhs.y; }
+bool Point::operator !=(const Point& rhs) { return x != rhs.x || y != rhs.y; }
+
+float Point::length() const
+{
+	return sqrtf((float)(x * x + y * y));
+}
+
+int Point::length_squared() const
+{
+	return x * x + y * y;
+}
+
+const Point Point::unitX = Point(1, 0);
+const Point Point::unitY = Point(0, 1);
+const Point Point::right = Point(1, 0);
+const Point Point::up = Point(0, -1);
+const Point Point::down = Point(0, 1);
+const Point Point::left = Point(-1, 0);
+const Point Point::zero = Point(0, 0);
+const Point Point::one = Point(1, 1);

src/math/quad.cpp

@@ -0,0 +1,21 @@
+#include <blah/math/quad.h>
+#include <blah/math/calc.h>
+
+namespace Blah
+{
+	void Quad::project(const Vec2& axis, float* min, float* max) const
+	{
+		float dot = Vec2::dot(a, axis);
+		*min = dot;
+		*max = dot;
+		dot = Vec2::dot(b, axis);
+		*min = Calc::min(dot, *min);
+		*max = Calc::max(dot, *max);
+		dot = Vec2::dot(c, axis);
+		*min = Calc::min(dot, *min);
+		*max = Calc::max(dot, *max);
+		dot = Vec2::dot(d, axis);
+		*min = Calc::min(dot, *min);
+		*max = Calc::max(dot, *max);
+	}
+}

src/math/rect.cpp

@@ -0,0 +1,275 @@
+#include <blah/math/rect.h>
+#include <blah/math/point.h>
+#include <blah/math/rectI.h>
+#include <blah/math/vec2.h>
+#include <blah/math/calc.h>
+#include <blah/math/mat3x2.h>
+
+using namespace Blah;
+
+Rect::Rect()
+{
+	x = y = w = h = 0;
+};
+
+Rect::Rect(float rx, float ry, float rw, float rh)
+{
+	x = rx;
+	y = ry;
+	w = rw;
+	h = rh;
+}
+
+Rect::Rect(Vec2 pos, Vec2 size)
+{
+	x = pos.x;
+	y = pos.y;
+	w = size.x;
+	h = size.y;
+}
+
+Rect::Rect(RectI r)
+{
+	x = (float)r.x;
+	y = (float)r.y;
+	w = (float)r.w;
+	h = (float)r.h;
+}
+
+Rect Rect::scale(float s)
+{
+	x = (x * s);
+	y = (y * s);
+	w = (w * s);
+	h = (h * s);
+	return *this;
+}
+
+Rect Rect::scale(float sx, float sy)
+{
+	x = (x * sx);
+	y = (y * sy);
+	w = (w * sx);
+	h = (h * sy);
+	return *this;
+}
+
+float Rect::left() const
+{
+	return x;
+}
+
+float Rect::right() const
+{
+	return x + w;
+}
+
+float Rect::top() const
+{
+	return y;
+}
+
+float Rect::bottom() const
+{
+	return y + h;
+}
+
+Vec2 Rect::center() const
+{
+	return Vec2(x + w / 2, y + h / 2);
+}
+
+float Rect::center_x() const
+{
+	return x + w / 2;
+}
+
+float Rect::center_y() const
+{
+	return y + h / 2;
+}
+
+Vec2 Rect::top_left() const
+{
+	return Vec2(x, y);
+}
+
+Vec2 Rect::top_right() const
+{
+	return Vec2(x + w, y);
+}
+
+Vec2 Rect::bottom_right() const
+{
+	return Vec2(x + w, y + h);
+}
+
+Vec2 Rect::bottom_left() const
+{
+	return Vec2(x, y + h);
+}
+
+Vec2 Rect::center_left() const
+{
+	return Vec2(x, y + h / 2);
+}
+
+Vec2 Rect::center_right() const
+{
+	return Vec2(x + w, y + h / 2);
+}
+
+Vec2 Rect::middle_top() const
+{
+	return Vec2(x + w / 2, y);
+}
+
+Vec2 Rect::middle_bottom() const
+{
+	return Vec2(x + w / 2, y + h);
+}
+
+Line Rect::left_line() const
+{
+	return Line(left(), top(), left(), bottom());
+}
+Line Rect::right_line() const
+{
+	return Line(right(), top(), right(), bottom());
+}
+Line Rect::top_line() const
+{
+	return Line(left(), top(), right(), top());
+}
+Line Rect::bottom_line() const
+{
+	return Line(left(), bottom(), right(), bottom());
+}
+
+bool Rect::contains(const Point& pt) const
+{
+	return pt.x >= x && pt.x < x + w && pt.y >= y && pt.y < y + h;
+}
+
+bool Rect::contains(const Vec2& pt) const
+{
+	return pt.x >= x && pt.x < x + w && pt.y >= y && pt.y < y + h;
+}
+
+bool Rect::overlaps(const Rect& rect) const
+{
+	return x + w >= rect.x && y + h >= rect.y && x < rect.x + rect.w && y < rect.y + rect.h;
+}
+
+Rect Rect::overlap_rect(const Rect& against) const
+{
+	Rect result(0, 0, 0, 0);
+
+	if (x + w >= against.x && x < against.x + against.w)
+	{
+		result.x = Calc::max(x, against.x);
+		result.w = Calc::min(x + w, against.x + against.w) - result.x;
+	}
+
+	if (y + h >= against.y && y < against.y + against.h)
+	{
+		result.y = Calc::max(y, against.y);
+		result.h = Calc::min(y + h, against.y + against.h) - result.y;
+	}
+
+	return result;
+}
+
+bool Rect::intersects(const Line& line) const
+{
+	return line.intersects(*this);
+}
+
+bool Rect::intersects(const Line& line, Vec2* out_intersection_point) const
+{
+	return line.intersects(*this, out_intersection_point);
+}
+
+bool Rect::intersects(const Vec2& line_from, const Vec2& line_to) const
+{
+	return intersects(Line(line_from, line_to));
+}
+
+bool Rect::intersects(const Vec2& line_from, const Vec2& line_to, Vec2* out_intersection_point) const
+{
+	return intersects(Line(line_from, line_to), out_intersection_point);
+}
+
+Vec2 Rect::intersection_point(const Line& line) const
+{
+	Vec2 ret;
+	if (line.intersects(*this, &ret))
+		return ret;
+	else
+		return Vec2::zero;
+}
+
+Vec2 Rect::intersection_point(const Vec2& line_from, const Vec2& line_to) const
+{
+	Vec2 ret;
+	if (Line(line_from, line_to).intersects(*this, &ret))
+		return ret;
+	else
+		return Vec2::zero;
+}
+
+Rect Rect::inflate(float amount) const
+{
+	return Rect(x - amount, y - amount, w + amount * 2, h + amount * 2);
+}
+
+Rect Rect::operator+(const Vec2& rhs) const { return Rect(x + rhs.x, y + rhs.y, w, h); }
+Rect Rect::operator-(const Vec2& rhs) const { return Rect(x - rhs.x, y - rhs.y, w, h); }
+Rect& Rect::operator+=(const Vec2& rhs) { x += rhs.x; y += rhs.y; return *this; }
+Rect& Rect::operator-=(const Vec2& rhs) { x -= rhs.x; y -= rhs.y; return *this; }
+
+Rect Rect::transform(const Rect& rect, const Mat3x2& matrix)
+{
+	return Rect(
+		(rect.x * matrix.m11) + (rect.y * matrix.m21) + matrix.m31,
+		(rect.x * matrix.m12) + (rect.y * matrix.m22) + matrix.m32,
+		(rect.w * matrix.m11) + (rect.h * matrix.m21),
+		(rect.w * matrix.m12) + (rect.h * matrix.m22));
+}
+
+Rect Rect::transform(float x, float y, float w, float h, const Mat3x2& matrix)
+{
+	return Rect(
+		(x * matrix.m11) + (y * matrix.m21) + matrix.m31,
+		(x * matrix.m12) + (y * matrix.m22) + matrix.m32,
+		(w * matrix.m11) + (h * matrix.m21),
+		(w * matrix.m12) + (h * matrix.m22));
+}
+
+Rect Rect::from_points(Vec2& from, Vec2& to)
+{
+	Vec2 min = Vec2(Calc::min(from.x, to.x), Calc::min(from.y, to.y));
+	Vec2 max = Vec2(Calc::max(from.x, to.x), Calc::max(from.y, to.y));
+	return Rect(min.x, min.y, max.x - min.x, max.y - min.y);
+}
+
+char Rect::get_sector(const Vec2& pt) const
+{
+	char h;
+	if (pt.x < left())
+		h = 0b0001;
+	else if (pt.x >= right())
+		h = 0b0010;
+	else
+		h = 0;
+
+	char v;
+	if (pt.y < top())
+		v = 0b0100;
+	else if (pt.y >= bottom())
+		v = 0b1000;
+	else
+		v = 0;
+
+	return h | v;
+}

src/math/rectI.cpp

@@ -0,0 +1,90 @@
+#include <blah/math/rectI.h>
+#include <blah/math/rect.h>
+#include <blah/math/point.h>
+#include <blah/math/vec2.h>
+
+using namespace Blah;
+
+RectI::RectI()
+{
+	x = y = w = h = 0;
+}
+
+RectI::RectI(int rx, int ry, int rw, int rh)
+{
+	x = rx;
+	y = ry;
+	w = rw;
+	h = rh;
+}
+
+RectI::RectI(Point pos, Point size)
+{
+	x = pos.x;
+	y = pos.y;
+	w = size.x;
+	h = size.y;
+}
+
+Point RectI::center() const { return Point(centerX(), centerY()); }
+Point RectI::top_left() const { return Point(left(), top()); }
+Point RectI::top_right() const { return Point(right(), top()); }
+Point RectI::bottom_left() const { return Point(left(), bottom()); }
+Point RectI::bottom_right() const { return Point(right(), bottom()); }
+
+bool RectI::contains(const Point& point) const
+{
+	return point.x >= x && point.x < x + w && point.y >= y && point.y < y + h;
+}
+
+bool RectI::contains(const Vec2& point) const
+{
+	return point.x >= x && point.x < x + w && point.y >= y && point.y < y + h;
+}
+
+char RectI::get_sector(const Point& pt) const
+{
+	char h;
+	if (pt.x < left())
+		h = 0b0001;
+	else if (pt.x >= right())
+		h = 0b0010;
+	else
+		h = 0;
+
+	char v;
+	if (pt.y < top())
+		v = 0b0100;
+	else if (pt.y >= bottom())
+		v = 0b1000;
+	else
+		v = 0;
+
+	return h | v;
+}
+
+char RectI::get_sector(const Vec2& pt) const
+{
+	char h;
+	if (pt.x < left())
+		h = 0b0001;
+	else if (pt.x >= right())
+		h = 0b0010;
+	else
+		h = 0;
+
+	char v;
+	if (pt.y < top())
+		v = 0b0100;
+	else if (pt.y >= bottom())
+		v = 0b1000;
+	else
+		v = 0;
+
+	return h | v;
+}
+
+RectI RectI::operator+(const Point& rhs) const { return RectI(x + rhs.x, y + rhs.y, w, h); }
+RectI RectI::operator-(const Point& rhs) const { return RectI(x - rhs.x, y - rhs.y, w, h); }
+RectI& RectI::operator+=(const Point& rhs) { x += rhs.x; y += rhs.y; return *this; }
+RectI& RectI::operator-=(const Point& rhs) { x -= rhs.x; y -= rhs.y; return *this; }

src/math/stopwatch.cpp

@@ -0,0 +1,26 @@
+#include <blah/math/stopwatch.h>
+#include <chrono>
+
+using namespace std::chrono;
+using namespace Blah;
+
+Stopwatch::Stopwatch()
+{
+	reset();
+}
+
+void Stopwatch::reset()
+{
+	start_time = std::chrono::duration_cast<std::chrono::microseconds>(system_clock::now().time_since_epoch()).count();
+}
+
+uint64_t Stopwatch::milliseconds()
+{
+	return microseconds() / 1000;
+}
+
+
+uint64_t Stopwatch::microseconds()
+{
+	return std::chrono::duration_cast<std::chrono::microseconds>(system_clock::now().time_since_epoch()).count() - start_time;
+}

src/math/vec2.cpp

@@ -0,0 +1,133 @@
+#include <blah/math/vec2.h>
+#include <blah/math/mat3x2.h>
+#include <blah/math/calc.h>
+#include <math.h>
+
+using namespace Blah;
+
+Vec2::Vec2() { x = y = 0; }
+Vec2::Vec2(float vx, float vy) { x = vx; y = vy; }
+Vec2::Vec2(int vx, float vy) { x = (float)vx; y = vy; }
+Vec2::Vec2(float vx, int vy) { x = vx; y = (float)vy; }
+Vec2::Vec2(int vx, int vy) { x = (float)vx; y = (float)vy; }
+Vec2::Vec2(Point p) { x = (float)p.x; y = (float)p.y; }
+
+Vec2 Vec2::operator +(const Vec2 rhs) const { return Vec2(x + rhs.x, y + rhs.y); }
+Vec2 Vec2::operator -(const Vec2 rhs) const { return Vec2(x - rhs.x, y - rhs.y); }
+Vec2 Vec2::operator /(const float rhs) const { return Vec2(x / rhs, y / rhs); }
+Vec2 Vec2::operator *(const float rhs) const { return Vec2(x * rhs, y * rhs); }
+Vec2 Vec2::operator-() const { return Vec2(-x, -y); }
+
+Vec2& Vec2::operator +=(const Vec2& rhs) { x += rhs.x; y += rhs.y; return *this; }
+Vec2& Vec2::operator -=(const Vec2& rhs) { x -= rhs.x; y -= rhs.y; return *this; }
+Vec2& Vec2::operator /=(const Vec2& rhs) { x /= rhs.x; y /= rhs.y; return *this; }
+Vec2& Vec2::operator *=(const Vec2& rhs) { x *= rhs.x; y *= rhs.y; return *this; }
+Vec2& Vec2::operator/=(float rhs) { x /= rhs; y /= rhs; return *this; }
+Vec2& Vec2::operator*=(float rhs) { x *= rhs; y *= rhs; return *this; }
+
+bool Vec2::operator ==(const Vec2& rhs) { return x == rhs.x && y == rhs.y; }
+bool Vec2::operator !=(const Vec2& rhs) { return x != rhs.x || y != rhs.y; }
+
+Vec2 Vec2::normal() const
+{
+	if (x == 0 && y == 0)
+		return zero;
+	float length = this->length();
+	return Vec2(x / length, y / length);
+}
+
+Vec2 Vec2::turn_right() const
+{
+	return Vec2(y, -x);
+}
+
+Vec2 Vec2::turn_left() const
+{
+	return Vec2(-y, x);
+}
+
+float Vec2::length() const { return sqrtf(x * x + y * y); }
+float Vec2::length_squared() const { return x * x + y * y; }
+
+Vec2 Vec2::perpendicular() const
+{
+	return Vec2(-y, x);
+}
+
+float Vec2::angle() const
+{
+	return Calc::atan2(y, x);
+}
+
+float Vec2::dot(Vec2 a, Vec2 b) { return (a.x * b.x + a.y * b.y); }
+float Vec2::dot(float x, float y, Vec2 b) { return (x * b.x + y * b.y); }
+float Vec2::dot(float x1, float y1, float x2, float y2) { return (x1 * x2 + y1 * y2); }
+
+Vec2 Vec2::transform(const Vec2& vec, const Mat3x2& matrix)
+{
+	return Vec2(
+		(vec.x * matrix.m11) + (vec.y * matrix.m21) + matrix.m31,
+		(vec.x * matrix.m12) + (vec.y * matrix.m22) + matrix.m32);
+}
+
+Vec2 Vec2::transform(float x, float y, const Mat3x2& matrix)
+{
+	return Vec2(
+		(x * matrix.m11) + (y * matrix.m21) + matrix.m31,
+		(x * matrix.m12) + (y * matrix.m22) + matrix.m32);
+}
+
+Vec2 Vec2::from_angle(float radians, float length)
+{
+	return Vec2((float)cos(radians) * length, (float)sin(radians) * length);
+}
+
+Vec2 Vec2::from_angle(float radians)
+{
+	return from_angle(radians, 1);
+}
+
+Vec2 Vec2::lerp(Vec2 a, Vec2 b, float t)
+{
+	if (t == 0)
+		return a;
+	else if (t == 1)
+		return b;
+	else
+		return a + (b - a) * t;
+}
+
+Vec2 Vec2::bezier_lerp(Vec2 start, Vec2 b, Vec2 end, float t)
+{
+	return lerp(lerp(start, b, t), lerp(b, end, t), t);
+}
+
+Vec2 Vec2::bezier_lerp(Vec2 start, Vec2 b, Vec2 c, Vec2 end, float t)
+{
+	return bezier_lerp(lerp(start, b, t), lerp(b, c, t), lerp(c, end, t), t);
+}
+
+Vec2 Vec2::reflect(const Vec2& vector, const Vec2& normal)
+{
+	float dot = vector.x * normal.x + vector.y * normal.y;
+
+	return Vec2(
+		vector.x - 2.0f * dot * normal.x,
+		vector.y - 2.0f * dot * normal.y);
+}
+
+const Vec2 Vec2::unit_x = Vec2(1, 0);
+const Vec2 Vec2::unit_y = Vec2(0, 1);
+const Vec2 Vec2::right = Vec2(1, 0);
+const Vec2 Vec2::up = Vec2(0, -1);
+const Vec2 Vec2::down = Vec2(0, 1);
+const Vec2 Vec2::left = Vec2(-1, 0);
+const Vec2 Vec2::zero = Vec2(0, 0);
+const Vec2 Vec2::one = Vec2(1, 1);
+
+#define DIAGONAL_UNIT 0.70710678118f
+const Vec2 Vec2::up_right = Vec2(DIAGONAL_UNIT, -DIAGONAL_UNIT);
+const Vec2 Vec2::up_left = Vec2(-DIAGONAL_UNIT, -DIAGONAL_UNIT);
+const Vec2 Vec2::down_right = Vec2(DIAGONAL_UNIT, DIAGONAL_UNIT);
+const Vec2 Vec2::down_left = Vec2(-DIAGONAL_UNIT, DIAGONAL_UNIT);
+#undef DIAGONAL_UNIT

src/streams/bufferstream.cpp

@@ -0,0 +1,107 @@
+#include <blah/streams/bufferstream.h>
+#include <string.h>
+
+using namespace Blah;
+
+BufferStream::BufferStream()
+	: m_buffer(nullptr), m_capacity(0), m_length(0), m_position(0) {}
+
+BufferStream::BufferStream(int capacity)
+	: m_buffer(nullptr), m_capacity(0), m_length(0), m_position(0)
+{
+	if (capacity > 0)
+	{
+		m_buffer = new char[capacity];
+		m_capacity = capacity;
+	}
+}
+
+BufferStream::BufferStream(BufferStream&& src) noexcept
+{
+	m_buffer = src.m_buffer;
+	m_length = src.m_length;
+	m_capacity = src.m_capacity;
+	m_position = src.m_position;
+	src.m_buffer = nullptr;
+	src.m_position = src.m_length = src.m_capacity = 0;
+}
+
+BufferStream& BufferStream::operator=(BufferStream&& src) noexcept
+{
+	m_buffer = src.m_buffer;
+	m_length = src.m_length;
+	m_capacity = src.m_capacity;
+	m_position = src.m_position;
+	src.m_buffer = nullptr;
+	src.m_position = src.m_length = src.m_capacity = 0;
+	return *this;
+}
+
+BufferStream::~BufferStream()
+{
+	delete[] m_buffer;
+}
+
+int64_t BufferStream::read_into(void* ptr, int64_t len)
+{
+	if (m_buffer == nullptr || ptr == nullptr)
+		return 0;
+
+	if (len < 0)
+		return 0;
+
+	if (len > m_length - m_position)
+		len = m_length - m_position;
+
+	memcpy(ptr, m_buffer + m_position, (size_t)len);
+	m_position += len;
+	return len;
+}
+
+int64_t BufferStream::write_from(const void* ptr, int64_t len)
+{
+	if (len < 0)
+		return 0;
+
+	// resize
+	if (m_position + len >= m_capacity)
+	{
+		auto last_capacity = m_capacity;
+
+		if (m_capacity <= 0)
+			m_capacity = 16;
+		while (m_position + len >= m_capacity)
+			m_capacity *= 2;
+
+		char* new_buffer = new char[m_capacity];
+		
+		if (m_buffer != nullptr)
+		{
+			memcpy(new_buffer, m_buffer, last_capacity);
+			delete[] m_buffer;
+		}
+
+		m_buffer = new_buffer;
+	}
+
+	// copy data
+	if (ptr != nullptr)
+		memcpy(m_buffer + m_position, ptr, (size_t)len);
+
+	// increment position
+	m_position += len;
+	if (m_position > m_length)
+		m_length = m_position;
+
+	// return the amount we wrote
+	return len;
+}
+
+void BufferStream::close()
+{
+	delete[] m_buffer;
+	m_buffer = nullptr;
+	m_position = 0;
+	m_length = 0;
+	m_capacity = 0;
+}

src/streams/filestream.cpp

@@ -0,0 +1,97 @@
+#include <blah/streams/filestream.h>
+#include <blah/core/log.h>
+#include "../internal/platform_backend.h"
+#include <string.h>
+
+using namespace Blah;
+
+FileStream::FileStream()
+{
+	m_handle = nullptr;
+	m_mode = FileMode::None;
+}
+
+FileStream::FileStream(const char* path, FileMode mode)
+	: m_mode(mode)
+{
+	if (!PlatformBackend::file_open(path, &m_handle, mode))
+		m_handle = nullptr;
+}
+
+FileStream::FileStream(FileStream&& src) noexcept
+{
+	m_handle = src.m_handle;
+	m_mode = src.m_mode;
+	src.m_handle = nullptr;
+}
+
+FileStream& FileStream::operator=(FileStream&& src) noexcept
+{
+	m_handle = src.m_handle;
+	m_mode = src.m_mode;
+	src.m_handle = nullptr;
+	return *this;
+}
+
+FileStream::~FileStream()
+{
+	if (m_handle != nullptr)
+		PlatformBackend::file_close(m_handle);
+}
+
+int64_t FileStream::length() const
+{
+	if (m_handle == nullptr)
+		return 0;
+
+	return PlatformBackend::file_length(m_handle);
+}
+
+int64_t FileStream::position() const
+{
+	if (m_handle == nullptr)
+		return 0;
+
+	return PlatformBackend::file_position(m_handle);
+}
+
+int64_t FileStream::seek(int64_t seek_to)
+{
+	if (m_handle == nullptr)
+		return 0;
+
+	return PlatformBackend::file_seek(m_handle, seek_to);
+}
+
+int64_t FileStream::read_into(void* ptr, int64_t length)
+{
+	if (m_handle == nullptr)
+	{
+		BLAH_ERROR("Unable to read from Stream");
+		return 0;
+	}
+
+	return PlatformBackend::file_read(m_handle, ptr, length);
+}
+
+int64_t FileStream::write_from(const void* ptr, int64_t length)
+{
+	if (length <= 0)
+		return 0;
+
+	if (m_handle == nullptr)
+	{
+		BLAH_ERROR("Unable to write to Stream");
+		return 0;
+	}
+
+	return PlatformBackend::file_write(m_handle, ptr, length);
+}
+
+void FileStream::close()
+{
+	if (m_handle != nullptr)
+		PlatformBackend::file_close(m_handle);
+	m_handle = nullptr;
+	m_mode = FileMode::None;
+}

src/streams/memorystream.cpp

@@ -0,0 +1,55 @@
+#include <blah/streams/memorystream.h>
+#include <string.h>
+
+using namespace Blah;
+
+MemoryStream::MemoryStream()
+	: m_data(nullptr), m_length(0), m_position(0) {}
+
+MemoryStream::MemoryStream(char* data, int64_t length)
+	: m_data(data), m_length(length), m_position(0) {}
+
+MemoryStream::MemoryStream(MemoryStream&& src) noexcept
+{
+	m_data = src.m_data;
+	m_position = src.m_position;
+	m_length = src.m_length;
+	src.m_data = nullptr;
+	src.m_length = src.m_position = 0;
+}
+
+MemoryStream& MemoryStream::operator=(MemoryStream&& src) noexcept
+{
+	m_data = src.m_data;
+	m_position = src.m_position;
+	m_length = src.m_length;
+	src.m_data = nullptr;
+	src.m_length = src.m_position = 0;
+	return *this;
+}
+
+int64_t MemoryStream::read_into(void* ptr, int64_t len)
+{
+	if (len < 0 || ptr == nullptr)
+		return 0;
+
+	if (len > m_length - m_position)
+		len = m_length - m_position;
+
+	memcpy(ptr, m_data + m_position, (size_t)len);
+	m_position += len;
+	return len;
+}
+
+int64_t MemoryStream::write_from(const void* ptr, int64_t len)
+{
+	if (len < 0 || ptr == nullptr)
+		return 0;
+
+	if (len > m_length - m_position)
+		len = m_length - m_position;
+
+	memcpy(m_data + m_position, ptr, (size_t)len);
+	m_position += len;
+	return len;
+}

src/streams/stream.cpp

@@ -0,0 +1,29 @@
+#include <blah/streams/stream.h>
+#include <blah/containers/str.h>
+#include <string.h>
+
+using namespace Blah;
+
+int64_t Stream::pipe(Stream& stream, int64_t length)
+{
+	const int BUFFER_LENGTH = 4096;
+	int64_t result = 0;
+
+	char buffer[BUFFER_LENGTH];
+	while (length > 0)
+	{
+		auto step = length;
+		if (step > BUFFER_LENGTH)
+			step = BUFFER_LENGTH;
+
+		auto count = read(buffer, step);
+		auto wrote = stream.write(buffer, count);
+		result += wrote;
+		length -= step;
+
+		if (count < step || wrote < count)
+			break;
+	}
+
+	return result;
+}