st/egl: Flush resources before presentation

Fixes wayland regression on r600g due to fast clear introduced by commit
edbbfac6.

Signed-off-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/state_trackers/egl/common/native_helper.c

@@ -340,6 +340,21 @@ resource_surface_throttle(struct resource_surface *rsurf)
    return FALSE;
 }
 
+boolean
+resource_surface_flush_resource(struct resource_surface *rsurf,
+                                struct native_display *ndpy,
+                                enum native_attachment which)
+{
+   struct pipe_context *pipe = ndpy_get_copy_context(ndpy);
+
+   if (!pipe)
+      return FALSE;
+
+   pipe->flush_resource(pipe, rsurf->resources[which]);
+
+   return TRUE;
+}
+
 boolean
 resource_surface_flush(struct resource_surface *rsurf,
 		       struct native_display *ndpy)

src/gallium/state_trackers/egl/common/native_helper.h

@@ -91,6 +91,11 @@ resource_surface_copy_swap(struct resource_surface *rsurf,
 boolean
 resource_surface_throttle(struct resource_surface *rsurf);
 
+boolean
+resource_surface_flush_resource(struct resource_surface *rsurf,
+                                struct native_display *ndpy,
+                                enum native_attachment which);
+
 /**
  * Flush pending rendering using the copy context. This function saves a
  * marker for upcoming throttles.

src/gallium/state_trackers/egl/wayland/native_wayland.c

@@ -259,6 +259,10 @@ wayland_surface_swap_buffers(struct native_surface *nsurf)
    if (ret == -1)
       return EGL_FALSE;
 
+   (void) resource_surface_flush_resource(surface->rsurf, &display->base,
+                                          NATIVE_ATTACHMENT_BACK_LEFT);
+   (void) resource_surface_flush(surface->rsurf, &display->base);
+
    surface->frame_callback = wl_surface_frame(surface->win->surface);
    wl_callback_add_listener(surface->frame_callback, &frame_listener, surface);
    wl_proxy_set_queue((struct wl_proxy *) surface->frame_callback,