NAME

       glDebugMessageCallback - specify a callback to receive debugging messages from the GL

C SPECIFICATION

       void glDebugMessageCallback(DEBUGPROC callback, void * userParam);

PARAMETERS

       callback
           The address of a callback function that will be called when a debug message is
           generated.

       userParam
           A user supplied pointer that will be passed on each invocation of callback.

DESCRIPTION

       glDebugMessageInsert sets the current debug output callback function to the function whose
       address is given in callback. The callback function should have the following prototype
       (in C), or be otherwise compatible with such a prototype:

                   typedef void (APIENTRY *DEBUGPROC)(GLenum source,
                                                      GLenum type,
                                                      GLuint id,
                                                      GLenum severity,
                                                      GLsizei length,
                                                      const GLchar* message,
                                                      void* userParam);

       This function is defined to have the same calling convention as the GL API functions. In
       most cases this is defined as APIENTRY, although it will vary depending on platform,
       language and compiler.

       Each time a debug message is generated the debug callback function will be invoked with
       source, type, id, and severity associated with the message, and length set to the length
       of debug message whose character string is in the array pointed to by messageuserParam
       will be set to the value passed in the userParam parameter to the most recent call to
       glDebugMessageInsert.

NOTES

       When the GL is in use remotely, the server may not be able to call functions in the
       client's address space. In such cases, the callback function may not be invoked and the
       user should retrieve debug messages from the context's debug message log by calling
       glGetDebugMessageLog().

SEE ALSO

       glDebugMessageControl(), glDebugMessageInsert(), glGetDebugMessageLog().

COPYRIGHT

       Copyright © 2012 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