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!