diff options
Diffstat (limited to 'xorg-server/dix/dixutils.c')
| -rw-r--r-- | xorg-server/dix/dixutils.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/xorg-server/dix/dixutils.c b/xorg-server/dix/dixutils.c index 5de74c8b4..cdd370bd6 100644 --- a/xorg-server/dix/dixutils.c +++ b/xorg-server/dix/dixutils.c @@ -866,3 +866,28 @@ InitCallbackManager(void) { DeleteCallbackManager(); } + +/** + * Coordinates the global GL context used by modules in the X Server + * doing rendering with OpenGL. + * + * When setting a GL context (glXMakeCurrent() or eglMakeCurrent()), + * there is an expensive implied glFlush() required by the GLX and EGL + * APIs, so modules don't want to have to do it on every request. But + * the individual modules using GL also don't know about each other, + * so they have to coordinate who owns the current context. + * + * When you're about to do a MakeCurrent, you should set this variable + * to your context's address, and you can skip MakeCurrent if it's + * already set to yours. + * + * When you're about to do a DestroyContext, you should set this to + * NULL if it's set to your context. + * + * When you're about to do an unbindContext on a DRI driver, you + * should set this to NULL. Despite the unbindContext interface + * sounding like it only unbinds the passed in context, it actually + * unconditionally clears the dispatch table even if the given + * context wasn't current. + */ +void *lastGLContext = NULL; |