20 - Opengl

OpenGL 2.0 let Windows, Linux, and macOS (via Apple's implementation) compete with DirectX 9.0c's shader model 3.0. OpenGL 2.0 vs. DirectX 9: The Shader Wars OpenGL 2.0 arrived later than DirectX 9 (late 2002), but it offered cleaner abstraction:

Shaders allowed real-time fluid simulation, fractal rendering, and post-process effects (bloom, depth of field) previously limited to pre-rendered CG. opengl 20

Medical imaging could use fragment shaders for real-time volume ray-casting. GIS applications used vertex shaders to warp satellite imagery over digital elevation models. OpenGL 2

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. Keywords: OpenGL 20, OpenGL 2.0, GLSL, programmable shaders, fixed-function pipeline, graphics API history, legacy OpenGL, shader tutorial Medical imaging could use fragment shaders for real-time