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glFast

glFast is a Public Domain C library that uses only 40 modern DSA AZDO OpenGL functions to draw geometry and post-process textures.

The contract:

  • SDL2, desktop OpenGL, Linux and Windows only. Doesn't support OS X, OpenGL ES or WebGL.
  • GPU memory is immutable. Once allocated you can't resize it, but you still can change its content.
  • No multithreaded or asynchronous CPU<->GPU interactions. No barriers and sync points except for glFinish call.
  • CPU sends data to GPU. GPU can't send data back to CPU, with an exception of reading textures from GPU to CPU.
  • Not all modern OpenGL extensions are used, only those which are supported on low-end hardware and Mesa 11.1+.

7 data types:

  • gpu_array_t Array
  • gpu_texture_t Texture
  • gpu_sampler_t Sampler
  • u32 Framebuffer
  • u32 Program
  • u32 ProgramPipeline
  • gpu_cmd_t DrawCommand

7 state changes:

  • glEnable()
  • glDisable()
  • glViewport()
  • glBindTextures()
  • glBindSamplers()
  • glBindFramebuffer()
  • glBindProgramPipeline()

That's it. Check out the examples to see how to use the library.

Special thanks to Nicolas @nlguillemot and Andreas @ands for answering my OpenGL questions and Micha @vurtun for suggestions on how to improve the library!