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Core in version 4.6
Core since version 3.3
Core ARB extension ARB_blend_func_extended

glGetFragDataIndex: query the bindings of color indices to user-defined varying out variables

Function Definition

 GLint glGetFragDataIndex(GLuint program​, const char * name​);
The name of the program containing varying out variable whose binding to query
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.

See Also

glLinkProgram, glBindFragDataLocation, glBindFragDataLocationIndexed, glGetFragDataLocation, glGetProgramResource, glGetProgramResourceLocationIndex


Copyright © 2010 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.