Technical Q&A QA1679

Deprecated built-in variables in GLSL Shaders

Q: What is the list of deprecated built-in variables in GLSL shaders?

A: What is the list of deprecated built-in variables in GLSL shaders?

Using generic attributes, varyings, and uniforms is preferred to depending on the fixed-function built-in variables, which are not available with OpenGL ES 2.0 on iPhone OS and not recommended for use on Mac OS X. For example, instead of using gl_ModelViewProjectionMatrix, create your own modelViewProjectionMatrix variable.

The following lists the deprecated fixed-function built-in variables in GLSL shaders.

Listing 1 DEPRECATED attributes and varyings

gl_Color
gl_SecondaryColor
gl_Normal
gl_Vertex
gl_MultiTexCoord0
gl_MultiTexCoord1
gl_MultiTexCoord2
gl_MultiTexCoord3
gl_MultiTexCoord4
gl_MultiTexCoord5
gl_MultiTexCoord6
gl_MultiTexCoord7
gl_FogCoord

Listing 2 DEPRECATED uniforms

gl_ModelViewMatrix
gl_ProjectionMatrix
gl_ModelViewProjectionMatrix
gl_TextureMatrix
gl_NormalMatrix
gl_ModelViewMatrixInverse
gl_ProjectionMatrixInverse
gl_ModelViewProjectionMatrixInverse
gl_TextureMatrixInverse
gl_ModelViewMatrixTranspose
gl_ProjectionMatrixTranspose
gl_ModelViewProjectionMatrixTranspose
gl_TextureMatrixTranspose
gl_ModelViewMatrixInverseTranspose
gl_ProjectionMatrixInverseTranspose
gl_ModelViewProjectionMatrixInverseTranspose
gl_TextureMatrixInverseTranspose
gl_NormalScale
gl_ClipPlane
gl_Point
gl_MaterialParameters
gl_LightSource
gl_FrontLightModelProduct
gl_BackLightModelProduct;
gl_FrontLightProduct
gl_BackLightProduct
gl_TextureEnvColor
gl_EyePlaneS
gl_EyePlaneT
gl_EyePlaneR
gl_EyePlaneQ
gl_ObjectPlaneS
gl_ObjectPlaneT
gl_ObjectPlaneR
gl_ObjectPlaneQ
gl_Fog

Document Revision History

Date	Notes
2010-06-04	New document that lists the fixed-function built-in variables discouraged from being used in GLSL shaders.