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 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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