|Core in version||4.5|
|Core since version||3.3|
|Core ARB extension||ARB_blend_func_extended|
glGetFragDataIndex: query the bindings of color indices to user-defined varying out variables
GLint glGetFragDataIndex(GLuint program, const char * name);
- 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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