NAME

       glBindFragDataLocationIndexed - bind a user-defined varying out variable to a fragment
       shader color number and index

C SPECIFICATION

       void glBindFragDataLocationIndexed(GLuint program, GLuint colorNumber, GLuint index,
                                          const char *name);

PARAMETERS

       program
           The name of the program containing varying out variable whose binding to modify

       colorNumber
           The color number to bind the user-defined varying out variable to

       index
           The index of the color input to bind the user-defined varying out variable to

       name
           The name of the user-defined varying out variable whose binding to modify

DESCRIPTION

       glBindFragDataLocationIndexed specifies that the varying out variable name in program
       should be bound to fragment color colorNumber when the program is next linked.  index may
       be zero or one to specify that the color be used as either the first or second color input
       to the blend equation, respectively.

       The bindings specified by glBindFragDataLocationIndexed have no effect until program is
       next linked. Bindings may be specified at any time after program has been created.
       Specifically, they may be specified before shader objects are attached to the program.
       Therefore, any name may be specified in name, including a name that is never used as a
       varying out variable in any fragment shader object. Names beginning with gl_ are reserved
       by the GL.

       If name was bound previously, its assigned binding is replaced with colorNumber and index.
       name must be a null-terminated string.  index must be less than or equal to one, and
       colorNumber must be less than the value of GL_MAX_DRAW_BUFFERS if index is zero, and less
       than the value of GL_MAX_DUAL_SOURCE_DRAW_BUFFERS if index is greater than or equal to
       one.

       In addition to the errors generated by glBindFragDataLocationIndexed, the program program
       will fail to link if:

       •   The number of active outputs is greater than the value GL_MAX_DRAW_BUFFERS.

       •   More than one varying out variable is bound to the same color number.

NOTES

       Varying out varyings may have locations assigned explicitly in the shader text using a
       location layout qualifier. If a shader statically assigns a location to a varying out
       variable in the shader text, that location is used and any location assigned with
       glBindFragDataLocation is ignored.

ERRORS

       GL_INVALID_VALUE is generated if colorNumber is greater than or equal to
       GL_MAX_DRAW_BUFFERS.

       GL_INVALID_VALUE is generated if colorNumber is greater than or equal to
       GL_MAX_DUAL_SOURCE_DRAW_BUFFERS and index is greater than or equal to one.

       GL_INVALID_VALUE is generated if index is greater than one.

       GL_INVALID_OPERATION is generated if name starts with the reserved gl_ prefix.

       GL_INVALID_OPERATION is generated if program is not the name of a program object.

ASSOCIATED GETS

       glGetFragDataLocation() with a valid program object and the the name of a user-defined
       varying out variable

       glGetFragDataIndex() with a valid program object and the the name of a user-defined
       varying out variable

SEE ALSO

       glCreateProgram(), glLinkProgram()glGetFragDataLocation(),
       glGetFragDataIndex()glBindFragDataLocation()

COPYRIGHT

       Copyright © 2010 Khronos Group. This material may be distributed subject to the terms and
       conditions set forth in the Open Publication License, v 1.0, 8 June 1999.
       http://opencontent.org/openpub/.

AUTHORS

       opengl.org