mirror of
https://github.com/NoelFB/blah.git
synced 2025-10-31 01:01:33 +08:00
67 lines
2.2 KiB
Markdown
67 lines
2.2 KiB
Markdown
## blah
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a small C++ game framework for 2D games.
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goal is to be simple and use as few dependencies as possible, to maintain easy building and portability.
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this will likely see breaking changes.
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#### building
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- Requires C++17 and CMake
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- Platform Backend
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- [SDL2](https://github.com/NoelFB/blah/blob/master/private/blah/internal/platform_backend_sdl2.cpp) can be enabled in CMake with `SDL2_ENABLED`, and setting `SDL2_INCLUDE_DIRS` and `SDL2_LIBRARIES`
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- Graphics Backend
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- [OpenGL](https://github.com/NoelFB/blah/blob/master/private/blah/internal/graphics_backend_gl.cpp) can be enabled in CMake with `OPENGL_ENABLED`.
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- [D3D11](https://github.com/NoelFB/blah/blob/master/private/blah/internal/graphics_backend_d3d11.cpp) (unfinished) can be enabled in CMake with `D3D11_ENABLED`.
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- Other backends can be added by implementing the [Platform Backend](https://github.com/NoelFB/blah/blob/master/private/blah/internal/platform_backend.h) or [Graphics Backend](https://github.com/NoelFB/blah/blob/master/private/blah/internal/graphics_backend.h).
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#### notes
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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/HLSL. This will need to change.
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- Only floatN/mat3x2/mat4x4 uniforms are supported.
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- There's no Audio API or backend implementation yet.
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- No threaded rendering so it 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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TextureRef tex;
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void startup()
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{
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tex = Texture::create("player.png");
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}
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void render()
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{
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App::backbuffer->clear(Color::black);
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auto center = Vec2(App::backbuffer->width(), App::backbuffer->height()) / 2;
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auto rotation = Time::elapsed * Calc::TAU;
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auto 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), Color::red);
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batch.tex(tex, Vec2(64, 0), Color::white);
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batch.pop_matrix();
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batch.render();
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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_startup = startup;
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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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