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# docs.GL

OpenGL 4
OpenGL 3

# glGetFragDataIndex

## Name

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. https://opencontent.org/openpub/.

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