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

## C Specification

GLint `glGetFragDataLocation` 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 binding to query

## Description

`glGetFragDataLocation` retrieves the assigned color number binding for the user-defined varying out variable name for program program. program must have previously been linked. name must be a null-terminated string. If name is not the name of an active user-defined varying out fragment shader variable within program, -1 will be returned.

## Errors

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

## See Also

glCreateProgram, glBindFragDataLocation

## 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/.