mirror of
https://github.com/NoelFB/blah.git
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57 lines
1.9 KiB
Markdown
57 lines
1.9 KiB
Markdown
## blah
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a small C++ game framework for 2D games.
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this will likely see breaking changes.
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#### prerequisites
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- A C++17 compiler and CMake
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- Only an SDL2 `platform` [is done](https://github.com/NoelFB/blah/blob/master/private/blah/internal/platform_backend_sdl2.cpp). CMake will need to find SDL2 via `SDL2_INCLUDE_DIRS` and `SDL2_LIBRARIES`
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- Only an OpenGL `graphics` [is done](https://github.com/NoelFB/blah/blob/master/private/blah/internal/graphics_backend_gl.cpp), so it currently requires OpenGL.
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#### notes
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- There are probably lots of small bugs as this is highly untested. Best used as a learning resource for now.
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- There's a custom "Vector" and "StackVector" classes that are not full replacements for std::vector.
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- There's no Shader abstraction, so the [Sprite Batcher](https://github.com/NoelFB/blah/blob/master/public/blah/drawing/batch.h) has hard-coded GLSL. This will need to change.
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- The rendering layer may be replaced with [FNA3D](https://github.com/FNA-XNA/FNA3D), [BGFX](https://github.com/bkaradzic/bgfx), [Sokol](https://github.com/floooh/sokol), or something else.
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- There's no Audio layer implementation yet.
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- No threaded rendering so the OpenGL implementation will explode if you try that
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#### a sample application
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```cpp
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#include <blah.h>
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using namespace Blah;
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Batch batch;
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void render()
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{
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Graphics::clear(Graphics::backbuffer, 0x00000000);
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Vec2 center = Vec2(App::draw_width(), App::draw_height()) / 2;
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float rotation = Time::elapsed * Calc::TAU;
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Mat3x2 transform = Mat3x2::create_transform(center, Vec2::zero, Vec2::one, rotation);
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batch.push_matrix(transform);
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batch.rect(Rect(-32, -32, 64, 64), 0xff0000);
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batch.pop_matrix();
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batch.render(Graphics::backbuffer);
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batch.clear();
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}
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int main()
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{
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Config config;
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config.name = "blah app";
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config.width = 1280;
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config.height = 720;
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config.on_render = render;
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App::run(&config);
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return 0;
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}
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```
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