Submitted By:            Pierre Labastie <pierre dot labastie at neuf dot fr>
Date:                    2023-06-12
Initial Package Version: 23.1.2
Upstream Status:         Not applied
Origin:                  Revert of https://gitlab.freedesktop.org/mesa/mesa/-/commit/19c57ea3bf6d77cf6f07f2a56e781f55b0e6013b
Description:             Fix segfault in gnome-shell on old Intel IGP
                         Should be necessary until gen 9th IGP
                         See also issue https://gitlab.freedesktop.org/mesa/mesa/-/issues/8542
                         Reported by Remi Carrier on blfs-dev
diff -ur a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
--- a/src/glx/dri2_glx.c	2023-06-08 13:13:06.000000000 +0200
+++ b/src/glx/dri2_glx.c	2023-06-12 08:29:15.380214921 +0200
@@ -652,7 +652,7 @@
       struct glx_display *glx_dpy = __glXInitialize(dpy);
       __GLXDRIdrawable *pdraw;
       pdraw = dri2GetGlxDrawableFromXDrawableId(dpy, drawable);
-      if (!pdraw)
+      if (!pdraw || !(pdraw->eventMask & GLX_BUFFER_SWAP_COMPLETE_INTEL_MASK))
          return 0;
       return glx_dpy->codes.first_event + GLX_BufferSwapComplete;
 }
Only in b/src/glx: dri2_glx.c.orig
diff -ur a/src/glx/glxclient.h b/src/glx/glxclient.h
--- a/src/glx/glxclient.h	2023-06-08 13:13:06.000000000 +0200
+++ b/src/glx/glxclient.h	2023-06-12 08:29:15.380214921 +0200
@@ -127,6 +127,7 @@
    struct glx_screen *psc;
    GLenum textureTarget;
    GLenum textureFormat;        /* EXT_texture_from_pixmap support */
+   unsigned long eventMask;
    int refcount;
 };
 
diff -ur a/src/glx/glx_pbuffer.c b/src/glx/glx_pbuffer.c
--- a/src/glx/glx_pbuffer.c	2023-06-08 13:13:06.000000000 +0200
+++ b/src/glx/glx_pbuffer.c	2023-06-12 08:29:15.380214921 +0200
@@ -60,6 +60,10 @@
                         const CARD32 * attribs, size_t num_attribs)
 {
    struct glx_display *priv = __glXInitialize(dpy);
+#ifdef GLX_DIRECT_RENDERING
+   __GLXDRIdrawable *pdraw;
+   int i;
+#endif
    CARD32 *output;
    CARD8 opcode;
 
@@ -87,6 +91,22 @@
    UnlockDisplay(dpy);
    SyncHandle();
 
+#ifdef GLX_DIRECT_RENDERING
+   pdraw = GetGLXDRIDrawable(dpy, drawable);
+
+   if (!pdraw)
+      return;
+
+   for (i = 0; i < num_attribs; i++) {
+      switch(attribs[i * 2]) {
+      case GLX_EVENT_MASK:
+	 /* Keep a local copy for masking out DRI2 proto events as needed */
+	 pdraw->eventMask = attribs[i * 2 + 1];
+	 break;
+      }
+   }
+#endif
+
    return;
 }
 
Only in b/src/glx: glx_pbuffer.c.orig