Opengl 20 May 2026

The cornerstone of OpenGL 20 is the introduction of the OpenGL Shading Language (GLSL) . For the first time, developers could compile and link small programs called shaders that executed directly on the GPU.

OpenGL 2.0 mandated two essential shader stages:

Crucially, OpenGL 2.0 introduced GLSL (OpenGL Shading Language) — a C-like language compiled at runtime. No more writing GPU assembly (like NVidia's Cg or ARB assembly). A simple GLSL vertex 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;
 opengl 20

And a matching fragment shader:

#version 110
varying vec3 v_color;
void main() 
gl_FragColor = vec4(v_color, 1.0);
 The cornerstone of OpenGL 20 is the introduction

This replaced hundreds of lines of glBegin()/glEnd() and glLightfv() calls.

OpenGL 2.0 is a significant release in the OpenGL API series, marking a substantial improvement over its predecessors. Released in 2004, OpenGL 2.0 introduced the OpenGL Shading Language (GLSL), which enabled developers to write custom shaders, allowing for more complex and realistic graphics rendering. And a matching fragment shader: #version 110 varying

Prior to version 2.0, OpenGL operated on a rigid pipeline. Vertices were transformed, lighting was calculated via the Phong reflection model, and textures were mapped via fixed operations.

This approach presented significant limitations: