Opengl 20 ((free)) Official

If you're diving into shader programming for the first time, start with OpenGL 2.0 / GLSL 1.20. It strips away compute shaders and indirect draws, leaving only the elegant core: vertices, fragments, and the code that connects them. Then, when you move to OpenGL 4.6 or Vulkan, you'll recognize every shader-based concept as a direct descendant of the revolution that began in 2004.

OpenGL 2.0 was more than GLSL. It also bundled several proven extensions into the core spec: opengl 20

The ARB convened at the Siggraph conference in San Antonio. The air in the cramped hotel conference room smelled of stale coffee and desperation. The debate raged for two days. If you're diving into shader programming for the

: Many older "GPU-bound" tools, such as the FurMark stress test, still list OpenGL 2.0 compliance as a minimum requirement for operation . OpenGL 2