2010 Khronos Group
glGetFragDataIndex 3G
glGetFragDataIndex query the bindings of color indices to user-defined varying out variables

## C Specification

GLint `glGetFragDataIndex` GLuint program const char * name

## Parameters

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

## Description

`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.

## Notes

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

## Errors

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

## See Also

glCreateProgram, glBindFragDataLocation, glBindFragDataLocationIndexed, glGetFragDataLocation

## Copyright

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. http://opencontent.org/openpub/.