[Mesa-dev] [PATCH] glx: only advertise GLX_INTEL_swap_event if it's supported

[Zack Rusin]

Only drivers supporting DRI2 version >=4 support GLX_INTEL_swap_event.
So lets mark it as such otherwise applications which use this extension
(i.e. everything based on Clutter, e.g. gnome-shell) break horribly on
drivers supporting DRI2 versions only up to 3.

Note: This is a candidate for the 9.0 branch.

Signed-off-by: Zack Rusin <zackr at vmware.com>
---
 src/glx/dri2_glx.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
index 1b3cf2b..a51716f 100644
--- a/src/glx/dri2_glx.c
+++ b/src/glx/dri2_glx.c
@@ -1062,8 +1062,9 @@ dri2BindExtensions(struct dri2_screen *psc, const __DRIextension **extensions)
    __glXEnableDirectExtension(&psc->base, "GLX_MESA_swap_control");
    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 
-   /* FIXME: if DRI2 version supports it... */
-   __glXEnableDirectExtension(&psc->base, "GLX_INTEL_swap_event");
+   if (psc->dri2->base.version >= 4) {
+      __glXEnableDirectExtension(&psc->base, "GLX_INTEL_swap_event");
+   }
 
    if (psc->dri2->base.version >= 3) {
       const unsigned mask = psc->dri2->getAPIMask(psc->driScreen);
-- 
1.7.10.4