OpenGL Shader Constants

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The following is a listing of GLSL constants avaliable in the shader

Constants

All the following variables are const

int gl_MaxVertexUniformComponents - The maximum amount of Vertex Uniforms.
int gl_MaxFragmentUniformComponents - The maximum amount of fragment uniforms.
int gl_MaxVertexAttribs - The maximum amount of vertex attributes.
int gl_MaxVaryingFloats - The maximum amount of varying float variables.
int gl_MaxDrawBuffers - The maximum amount of draw buffers.
int gl_MaxTextureCoords - The maximum amount of texture coordinates.
int gl_MaxTextureUnits - The maximum number of texture units.
int gl_MaxVertexTextureUnits - The maximum number of texture units on a vertex.
int gl_MaxCombinedTextureImageUnits - The maximum number of combined texture units.
int gl_MaxLights - The maximum number of lights.
int gl_MaxClipPlanes - The maximum number of clip planes.

These preprocessor functions work in much the same way that C preprocessor commands work.