Query the bindings of color indices 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 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.
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