compositor-drm: Flush before pageflipping

This fixes compositor-drm flickering on r600.

diff --git a/compositor/compositor-drm.c b/compositor/compositor-drm.c
index 6df6b34..50f353b 100644 (file)
--- a/compositor/compositor-drm.c
+++ b/compositor/compositor-drm.c
@@ -65,6 +65,7 @@ drm_compositor_present(struct wlsc_compositor *ec)
                                          GL_COLOR_ATTACHMENT0,
                                          GL_RENDERBUFFER,
                                          output->rbo[output->current]);
+               glFlush();
 
                drmModePageFlip(c->base.drm.fd, output->crtc_id,
                                output->fb_id[output->current ^ 1],