glGetFragDataIndex.3G man page

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

C Specification

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.

Version Support

OpenGL Version
Function / Feature Name 2.0 2.1 3.0 3.1 3.2 3.3 4.0 4.1 4.2 4.3 4.4 4.5
glGetFragDataIndex - - - -

See Also

glCreateProgram(), glBindFragDataLocation(), glBindFragDataLocationIndexed(), glGetFragDataLocation()


07/13/2018 [FIXME: source] [FIXME: manual]