[billsix]

Nice! PortableGL is also great, OpenGL api that is defined in entirely in C and writes the “framebuffer” into an SDL window

https://github.com/rswinkle/PortableGL

[rswinkle]

Minor correction/clarification, the library doesn't depend on SDL, it just writes into a 32 bit color frame buffer, but all the demos/examples use SDL for getting it to the screen since that's the best option. The test suite just writes frames to disk as png images to compare against expected for example.

[jstimpfle]

It's an implementation, not an API.

[sylware]

... and it is opengl-ish, namely seriously castrated (shaders). Borrowing maths from Mr. Bellard's tinygl.