Mesa (master): glxext: Send the Drawable' s ID in the GLX_BufferSwapComplete event

[Dave Airlie]

Module: Mesa
Branch: master
Commit: b4dcf87f34f68111acd9d364739938721fc692f4
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b4dcf87f34f68111acd9d364739938721fc692f4

Author: Jasper St. Pierre <jstpierre at mecheye.net>
Date:   Tue Jun 24 13:43:53 2014 -0400

glxext: Send the Drawable's ID in the GLX_BufferSwapComplete event

While the official INTEL_swap_event specification says that the drawable
field should contain the GLXDrawable, not the Drawable, the existing
DRI2 code in dri2.c that translates from DRI2_BufferSwapComplete sends out
GLX_BufferSwapComplete with the Drawable's ID, so existing codebases
like Clutter/Cogl rely on getting the Drawable.

Match DRI2's error here and stuff the event with the X Drawable, not
the GLX drawable.

This fixes apps seeing wrong drawables through an indirect GLX context
or with DRI3, which uses the GLX_BufferSwapComplete event directly on
the wire instead of translates Present in mesa.

At the same time, also modify the structure for the event to make sure
that clients don't make the same mistake. This is not an API or ABI
break, as GLXDrawable and Drawable are both typedefs for XID.

Signed-off-by: Jasper St. Pierre <jstpierre at mecheye.net>
Reviewed-by: Axel Davy <axel.davy at ens.fr>
Cc: "10.1 10.2" <mesa-stable at lists.freedesktop.org>
Signed-off-by: Dave Airlie <airlied at redhat.com>

---

 include/GL/glx.h |    2 +-
 src/glx/glxext.c |    9 +++++----
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/include/GL/glx.h b/include/GL/glx.h
index 234abc0..78f5052 100644
--- a/include/GL/glx.h
+++ b/include/GL/glx.h
@@ -518,7 +518,7 @@ typedef struct {
     unsigned long serial;	/* # of last request processed by server */
     Bool send_event;		/* true if this came from a SendEvent request */
     Display *display;		/* Display the event was read from */
-    GLXDrawable drawable;	/* drawable on which event was requested in event mask */
+    Drawable drawable;	/* drawable on which event was requested in event mask */
     int event_type;
     int64_t ust;
     int64_t msc;
diff --git a/src/glx/glxext.c b/src/glx/glxext.c
index 94582f6..68c359e 100644
--- a/src/glx/glxext.c
+++ b/src/glx/glxext.c
@@ -134,14 +134,15 @@ __glXWireToEvent(Display *dpy, XEvent *event, xEvent *wire)
       GLXBufferSwapComplete *aevent = (GLXBufferSwapComplete *)event;
       xGLXBufferSwapComplete2 *awire = (xGLXBufferSwapComplete2 *)wire;
       struct glx_drawable *glxDraw = GetGLXDrawable(dpy, awire->drawable);
-      aevent->event_type = awire->event_type;
-      aevent->drawable = awire->drawable;
-      aevent->ust = ((CARD64)awire->ust_hi << 32) | awire->ust_lo;
-      aevent->msc = ((CARD64)awire->msc_hi << 32) | awire->msc_lo;
 
       if (!glxDraw)
 	 return False;
 
+      aevent->event_type = awire->event_type;
+      aevent->drawable = glxDraw->xDrawable;
+      aevent->ust = ((CARD64)awire->ust_hi << 32) | awire->ust_lo;
+      aevent->msc = ((CARD64)awire->msc_hi << 32) | awire->msc_lo;
+
       if (awire->sbc < glxDraw->lastEventSbc)
 	 glxDraw->eventSbcWrap += 0x100000000;
       glxDraw->lastEventSbc = awire->sbc;