drm: bugfix. change back_fb_index correctly

Change-Id: I507361ef29ff850528da71a4bb583b5e6f3c1cdc

diff --git a/src/lib/drm/drm-output.c b/src/lib/drm/drm-output.c
index 6fc7eb6e57f96781a96f98af8140553d6fdb7527..3087af97cf4643b6177cbcd18f944d9669df9bb1 100644 (file)
--- a/src/lib/drm/drm-output.c
+++ b/src/lib/drm/drm-output.c
@@ -201,8 +201,8 @@ drm_output_render(drm_output_t *output)
         pixman_region32_copy(&output->previous_damage, damage);
         damage = &total_damage;
 
-        output->render_target = output->fb[output->back_fb_index]->pixman_render_target;
         output->back_fb_index ^= 1;
+        output->render_target = output->fb[output->back_fb_index]->pixman_render_target;
     }
 
     pepper_renderer_set_target(output->renderer, output->render_target);