wglGetProcAddress
[New
- Windows 95, OEM Service Release 2]
The wglGetProcAddress
function returns the address of an OpenGL extension function for use with
the current OpenGL rendering context.
PROC wglGetProcAddress(
|
LPCSTR lpszProc |
// name of
the extension function |
|
); |
|
Parameters
lpszProc
Points to a
null-terminated string that is the name of the extension function. The name of
the extension function must be identical to a corresponding function
implemented by OpenGL.
Return Values
When the
function succeeds, the return value is the address of the extension function.
When no current
rendering context exists or the function fails, the return value is NULL. To
get extended error information, call GetLastError.
Remarks
The OpenGL
library supports multiple implementations of its functions. Extension functions
supported in one rendering context are not necessarily available in a separate
rendering context. Thus, for a given rendering context in an application, use
the function addresses returned by the wglGetProcAddress function only.
The spelling
and the case of the extension function pointed to by lpszProc must be
identical to that of a function supported and implemented by OpenGL. Because
extension functions are not exported by OpenGL, you must use wglGetProcAddress
to get the addresses of vendor-specific extension functions.
The extension
function addresses are unique for each pixel format. All rendering contexts of
a given pixel format share the same extension function addresses.
See Also