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[libvirt] [PULL 04/12] sdl2: redraw correctly when scanout_mode enabled.



From: Tao Wu <lepton google com>

When scanout_mode enabled, surface is out of sync with actual screen.
In such case, we just call sdl2_gl_scanout_flush to do redraw. This
fixes bug reported in
https://lists.freedesktop.org/archives/virglrenderer-devel/2018-July/001330.html

Signed-off-by: Tao Wu <lepton google com>
Message-id: 20180726225900 180698-1-lepton google com
Signed-off-by: Gerd Hoffmann <kraxel redhat com>
---
 ui/sdl2-gl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ui/sdl2-gl.c b/ui/sdl2-gl.c
index 83b71853d1..1bf4542d8d 100644
--- a/ui/sdl2-gl.c
+++ b/ui/sdl2-gl.c
@@ -124,6 +124,11 @@ void sdl2_gl_redraw(struct sdl2_console *scon)
 {
     assert(scon->opengl);
 
+    if (scon->scanout_mode) {
+        /* sdl2_gl_scanout_flush actually only care about
+         * the first argument. */
+        return sdl2_gl_scanout_flush(&scon->dcl, 0, 0, 0, 0);
+    }
     if (scon->surface) {
         sdl2_gl_render_surface(scon);
     }
-- 
2.9.3


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