Shaders allowed real-time fluid simulation, fractal rendering, and post-process effects (bloom, depth of field) previously limited to pre-rendered CG.
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
When developers or students search for "OpenGL 20," they are typically referring to OpenGL 2.0 —a watershed moment in graphics programming history. Released in September 2004, OpenGL 2.0 didn't just add a few extensions; it fundamentally rewired how developers interact with GPU hardware.
And a matching fragment shader:
#version 110 attribute vec4 a_position; attribute vec3 a_color; varying vec3 v_color; uniform mat4 u_mvpMatrix; void main() v_color = a_color; gl_Position = u_mvpMatrix * a_position;
Today, you can run an OpenGL 2.0 program on a Raspberry Pi, a Windows 11 PC with Intel integrated graphics, or an Android device via GLES 2.0 (which is based heavily on OpenGL 2.0). It is the of modern graphics APIs—outdated as a living tongue, but foundational to everything that followed.
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 20
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