Provided by: opengl-4-man-doc_1.0~svn22917-1_all
glGetFragDataLocation - query the bindings of color numbers to user-defined varying out variables
GLint glGetFragDataLocation(GLuint program, const char * name);
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
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.
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