Programming Shaders
The language in which shaders are programmed depends on the target environment. The official OpenGL and OpenGL ES shading language is OpenGL Shading Language, also known as GLSL, and the official Direct3D shading language is High Level Shader Language, also known as HLSL. However, Cg is a third-party shading language developed by Nvidia that outputs both OpenGL and Direct3D shaders.
Example: GLSL program for shading normals without light or texture
// Vertex Shader varying vec4 color; void main { // Treat the normal (x, y, z) values as (r, g, b) color components. color = vec4(clamp(abs((gl_Normal + 1.0) * 0.5), 0.0, 1.0), 1.0); gl_Position = ftransform; } // Fragment Shader varying vec4 color; void main { gl_FragColor = color; }Read more about this topic: Shader
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