glGetFragDataLocation - query the bindings of color numbers to user-defined varying out variables

GLintglGetFragDataLocation(GLuintprogram,constchar*name);

       Copyright © 2010-2014 Khronos Group

[FIXME: source]                                    11/18/2024                           GLGETFRAGDATALOCATIO(3G)

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.

       glGetFragDataLocation - query the bindings of color numbers to user-defined varying out variables

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

glCreateProgram(), glBindFragDataLocation()

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       │ Function              │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
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       ├───────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │ glGetFragDataLocation │  -  │  -  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │
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