glDebugMessageCallback man page on Oracle

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GLDEBUGMESSAGECALLBA(3G)	 OpenGL Manual	      GLDEBUGMESSAGECALLBA(3G)

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

opengl.org			  04/29/2014	      GLDEBUGMESSAGECALLBA(3G)
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