glCreateProgram, glBindFragDataLocation, glBindFragDataLocationIndexed, glGetFragDataLocation
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glGetFragDataIndex: man3/glGetFragDataIndex.xml
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.