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Built in Constants
There are built-in constants that store the number of variables that can be defined for each data type.
| Built-in Constant | Minimum |
| gl_MaxVertexAttribs | 8 |
| gl_MaxVertexUniformVectors | 128 |
| gl_MaxVaryingVectors | 8 |
| gl_MaxVertexTextureImageUnits | 0 |
| gl_MaxCombinedTextureImageUnits | 8 |
| gl_MaxTextureImageUnits | 8 |
| gl_MaxFragmentUniformVectors | 16 |
| gl_MaxDrawBuffers | 1 |