Mesa (master): virgl/vtest: fix front buffer flush with protocol version 0.

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Module: Mesa
Branch: master
Commit: d1ce7eba8b056bfd7d8f29cc0f583777a7ee30e5
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d1ce7eba8b056bfd7d8f29cc0f583777a7ee30e5

Author: Dave Airlie <airlied at redhat.com>
Date:   Thu Dec 27 16:09:19 2018 +1000

virgl/vtest: fix front buffer flush with protocol version 0.

Older versions of virglrenderer before 33da7361aec486290df0aec4ad8dfa8ff6adde2c
in vtest mode, misrender gears.

Fixes: 9d81cd8e7c (virgl: Pass resource size and transfer offsets)
Reviewed-By: Gert  Wollny <gert.wollny at collabora.com>

---

 src/gallium/winsys/virgl/vtest/virgl_vtest_winsys.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/winsys/virgl/vtest/virgl_vtest_winsys.c b/src/gallium/winsys/virgl/vtest/virgl_vtest_winsys.c
index 65963ad50e..5422b29e55 100644
--- a/src/gallium/winsys/virgl/vtest/virgl_vtest_winsys.c
+++ b/src/gallium/winsys/virgl/vtest/virgl_vtest_winsys.c
@@ -644,7 +644,7 @@ static void virgl_vtest_flush_frontbuffer(struct virgl_winsys *vws,
     * get the data. */
    virgl_vtest_recv_transfer_get_data(vtws, map + offset, size, valid_stride,
                                       &box, res->format,
-                                      util_format_get_stride(res->format, res->width));
+                                      vtws->protocol_version == 0 ? valid_stride : util_format_get_stride(res->format, res->width));
 
    vtws->sws->displaytarget_unmap(vtws->sws, res->dt);