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Query the bindings of color indices to user-defined varying out variables.

C Specification[edit]

GLint glGetFragDataIndex( GLuint program, const char * name );


program - The name of the program containing varying out variable whose binding to query
name - The name of the user-defined varying out variable whose index to query


 glGetFragDataIndex returns the index of the fragment color to which the variable name was bound when the program object program was last linked. If name is not a varying out variable of program , or if an error occurs, -1 will be returned.


 glGetFragDataIndex is available only if the GL version is 3.3 or greater.


 GL_INVALID_OPERATION is generated if program is not the name of a program object.

Version Support[edit]

 glGetFragDataIndex  3.2+

See Also[edit]

 glCreateProgram , glBindFragDataLocation , glBindFragDataLocationIndexed , glGetFragDataLocation 


Copyright© 2010-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999.