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7 Cards in this Set

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gl_Position?
Vertex shader mandatory output variable.

Represent a transformed position of the current vertex. (for example, the vertex in the camera frame)
gl_FragColor
Fragment shader special output variable. Either gl_FragColor or gl_FragData must be written
gl_Vertex
Vertex coordinates (x,y,z,w) in the global frame.
gl_MultiTexCoordX?
Vertex shader input variable. Coordinates of the texture unit X
gl_TexCoord[N] ?
Interpolated texture coordinates of texture N for current pixel (I'm not sure)
uniform variable?
shader read only input variable which value is set in the openGL program.
sampler1D,2D,3D?
qualifier to declare a texture handler.