NAME

       glBindFragDataLocation - bind a user-defined varying out variable to a fragment shader
       color number

C SPECIFICATION

       void glBindFragDataLocation(GLuint program, GLuint colorNumber, 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

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

DESCRIPTION

       glBindFragDataLocation explicitly specifies the binding of the user-defined varying out
       variable name to fragment shader color number colorNumber for program program. If name was
       bound previously, its assigned binding is replaced with colorNumber.  name must be a
       null-terminated string.  colorNumber must be less than GL_MAX_DRAW_BUFFERS.

       The bindings specified by glBindFragDataLocation 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.

       In addition to the errors generated by glBindFragDataLocation, 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 indexed 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_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

SEE ALSO

       glCreateProgram(), glGetFragDataLocation()

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