restructured project to match a more standard cmake setup

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();
+	}
+}