[Mesa-dev] [PATCH] dri3/GLX: Fix drawable invalidation

[Thomas Hellstrom]

A number of internal VMware apitrace traces image comparisons fail with
dri3 because the viewport transformation becomes incorrect after an X
drawable resize. The incorrect viewport transformation sometimes persist
until the second draw-call after a swapBuffer.

Comparing with the dri2 glx code there are a couple of places where dri2
invalidates the drawable in the absence of server-triggered invalidation,
where dri3 doesn't do that. When these invalidation points are added to
dri3, the image comparisons become correct.

Cc: <mesa-stable at lists.freedesktop.org>
Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
---
 src/glx/dri3_glx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/glx/dri3_glx.c b/src/glx/dri3_glx.c
index 4264fd8..7732279 100644
--- a/src/glx/dri3_glx.c
+++ b/src/glx/dri3_glx.c
@@ -235,6 +235,11 @@ dri3_bind_context(struct glx_context *context, struct glx_context *old,
    if (!(*psc->core->bindContext) (pcp->driContext, dri_draw, dri_read))
       return GLXBadContext;
 
+   if (dri_draw)
+      (*psc->f->invalidate)(dri_draw);
+   if (dri_read)
+      (*psc->f->invalidate)(dri_read);
+
    return Success;
 }
 
@@ -493,6 +498,7 @@ dri3_flush_front_buffer(__DRIdrawable *driDrawable, void *loaderPrivate)
 
    loader_dri3_flush(draw, __DRI2_FLUSH_DRAWABLE, __DRI2_THROTTLE_FLUSHFRONT);
 
+   (*psc->f->invalidate)(driDrawable);
    loader_dri3_wait_gl(draw);
 }
 
-- 
2.7.4