| WGL_ARB_extensions_string |
WGL_ARB_extensions_string
WGL_ARB_extensions_string
Paula Womack, 3dfx Interactive, paulaw 'at' 3dfx.com
Complete. Approved by ARB on March 15, 2000
Last Modified Date: March 22, 2000
Author Revision: 1.0
ARB Extension #8
None
This extension provides a way for applications to determine which
WGL extensions are supported by a device. This is the foundation
upon which other WGL extensions are built.
No issues.
1. Note that extensions that were previously advertised via
glGetString (e.g., the swap interval extension) should continue to
be advertised there so existing applications don't break. They
should also be advertised via wglGetExtensionsStringARB so new
applications can make one call to find out which WGL extensions are
supported.
2. Should this function take an hdc? It seems like a good idea. At
some point MS may want to incorporate this into OpenGL32. If they
do this and and they want to support more than one ICD, then an HDC
would be needed.
   New Procedures and Functions |
const char *wglGetExtensionsStringARB(HDC hdc);
None
| Additions to Chapter 2 of the 1.2 Specification (OpenGL Operation) |
None
| Additions to Chapter 3 of the 1.2 Specification (Rasterization) |
None
| Additions to Chapter 4 of the 1.2 Specification (Per-Fragment Operations and the Frame buffer) |
None
| Additions to Chapter 5 of the 1.2 Specification (Special Functions) |
None
| Additions to Chapter 6 of the 1.2 Specification (State and State Requests) |
None
| Additions to the WGL Specification |
Advertising WGL Extensions
Applications should call wglGetProcAddress to see whether or not
wglGetExtensionsStringARB is supported. If it is supported then it
can be used to determine which WGL extensions are supported by the
device.
const char *wglGetExtensionsStringARB(HDC hdc);
<hdc> device context to query extensions for
If the function succeeds, it returns a list of supported extensions
to WGL. Although the contents of the string is implementation
specific, the string will be NULL terminated and will contain a
space-separated list of extension names. (The extension names
themselves do not contain spaces.) If there are no extensions then
the empty string is returned.
If <hdc> does not indicate a valid device context then the function
fails and the error ERROR_DC_NOT_FOUND is generated. If the function
fails, the return value is NULL. To get extended error information,
call GetLastError.
None
| New Implementation Dependent State |
None
Changes from EXT_extension_string:
Added hdc parameter to facilitate moving this function into OPENGL32
Added WGL to name to avoid name collisions with GL and GLX
 |  | Last update: November 14, 2006.
Cette page doit être lue avec un navigateur récent respectant le standard XHTML 1.1.
|
