clarified readme

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Noel Berry 2020-12-24 00:21:38 -08:00 committed by GitHub
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@ -5,18 +5,16 @@ this will likely see breaking changes.
#### prerequisites
- A C++17 compiler and CMake
- 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`
- 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.
- Only an SDL2 `platform backend` [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`
- Only an OpenGL `graphics backend` [is done](https://github.com/NoelFB/blah/blob/master/private/blah/internal/graphics_backend_gl.cpp), so it requires OpenGL.
#### notes
- There are probably lots of small bugs as this is highly untested. Best used as a learning resource for now.
- There's a custom "Vector" and "StackVector" classes that are not full replacements for std::vector.
- 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.
- 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.
- There's no Audio layer implementation yet.
- No threaded rendering so the OpenGL implementation will explode if you try that
#### a sample application
```cpp