rswinkle/PortableGL

Health v2 · maintenance only

Adoption not part of the score

1279 stars · 60 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

PortableGL is a software implementation of OpenGL 3.x core written in clean C99 as a single-header library in the style of the stb libraries. It renders to arbitrary 32- or 16-bit framebuffers, using C/C++ functions instead of GLSL for shaders.

Use cases

• render 3D graphics without GPU or OpenGL drivers
• add OpenGL-style rendering to any codebase via a single header
• learn how an OpenGL rendering pipeline works internally
• write shaders as plain C functions instead of GLSL
• render to offscreen framebuffers or image files
• port OpenGL applications to platforms without native GL support

When to choose

• you need portable software rendering with no GPU dependency
• you want a small, easy-to-integrate single-header C library
• you want readable source code to study or modify the rendering pipeline
• you need to match OpenGL 3.x features in pure C/C++

When to avoid

• you need maximum rendering performance or hardware acceleration
• you require exact OpenGL API compliance or a GLSL compiler
• you are building a production game that should use the real GPU driver

Facets

library · maturity active

graphics game-engine simulation graphics cross-platform cross-platform windows cpp c opengl software-rendering rasterizer single-header c99 shaders 3d-graphics sdl2 game-development linux macos

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