query the bindings of color numbers to user-defined varying out variables
The name of the program containing varying out variable whose binding to query
The name of the user-defined varying out variable whose binding to query
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.
GL_INVALID_OPERATION is generated if program is not the name of a program object.
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/ .