glGetFragDataIndex - query the bindings of color indices to user-defined varying out variables
GLint glGetFragDataIndex(GLuint program, const char * name);
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.
glCreateProgram(), glBindFragDataLocation(), glBindFragDataLocationIndexed(), glGetFragDataLocation()
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