glDebugMessageCallback — specify a callback to receive debugging messages from the GL
|void * userParam|
The address of a callback function that will be called when a debug message is generated.
A user supplied pointer that will be passed on each invocation of
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
severity associated with the message, and
length set to
the length of debug message whose character string is in the array pointed to by
userParam will be set to the value passed in the
userParam parameter to the most recent call to
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.
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/.