DRI2: Don't disable GLX_INTEL_swap_event unconditionally

GLX_INTEL_swap_event is broken on the server side, where it's
currently unconditionally enabled. This completely breaks
systems running on drivers which don't support that extension.
There's no way to test for its presence on this side, so instead
of disabling it uncondtionally, just disable it for drivers
which are known to not support it. It makes sense because
most drivers do support it right now.
We'll be able to remove this once Xserver properly advertises
GLX_INTEL_swap_event.

Note: This is a candidate for stable branch branches.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=60052
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
Tested-by: Ian Romanick <ian.d.romanick@intel.com>

diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
index 46a92fd7da4c2bd8942c394d25623e459468c342..c4f6996561e25626f047699e654561893c2a17ae 100644 (file)
--- a/src/glx/dri2_glx.c
+++ b/src/glx/dri2_glx.c
@@ -1051,7 +1051,8 @@ static const struct glx_context_vtable dri2_context_vtable = {
 };
 
 static void
-dri2BindExtensions(struct dri2_screen *psc, const __DRIextension **extensions)
+dri2BindExtensions(struct dri2_screen *psc, const __DRIextension **extensions,
+                   const char *driverName)
 {
    int i;
 
@@ -1060,7 +1061,15 @@ dri2BindExtensions(struct dri2_screen *psc, const __DRIextension **extensions)
    __glXEnableDirectExtension(&psc->base, "GLX_MESA_swap_control");
    __glXEnableDirectExtension(&psc->base, "GLX_SGI_make_current_read");
 
-   if (psc->dri2->base.version >= 4) {
+   /*
+    * GLX_INTEL_swap_event is broken on the server side, where it's
+    * currently unconditionally enabled. This completely breaks
+    * systems running on drivers which don't support that extension.
+    * There's no way to test for its presence on this side, so instead
+    * of disabling it uncondtionally, just disable it for drivers
+    * which are known to not support it.
+    */
+   if (strcmp(driverName, "vmwgfx") != 0) {
       __glXEnableDirectExtension(&psc->base, "GLX_INTEL_swap_event");
    }
 
@@ -1204,7 +1213,7 @@ dri2CreateScreen(int screen, struct glx_display * priv)
    }
 
    extensions = psc->core->getExtensions(psc->driScreen);
-   dri2BindExtensions(psc, extensions);
+   dri2BindExtensions(psc, extensions, driverName);
 
    configs = driConvertConfigs(psc->core, psc->base.configs, driver_configs);
    visuals = driConvertConfigs(psc->core, psc->base.visuals, driver_configs);