1 files changed, 31 insertions, 0 deletions
diff --git a/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c b/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c
index 1ecafa451e..50edf7306d 100644
--- a/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c
+++ b/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c
@@ -29,9 +29,14 @@
 
 #include "main/context.h"
 #include "pipe/p_format.h"
+#include "pipe/p_screen.h"
 #include "state_tracker/st_context.h"
 #include "state_tracker/st_public.h"
 #include "stw_framebuffer.h"
+#include "stw_device.h"
+#include "stw_public.h"
+#include "stw_winsys.h"
+
 
 void
 framebuffer_resize(
@@ -179,3 +184,29 @@ framebuffer_from_hdc(
          return fb;
    return NULL;
 }
+
+
+BOOL
+stw_swap_buffers(
+   HDC hdc )
+{
+   struct stw_framebuffer *fb;
+   struct pipe_surface *surf;
+
+   fb = framebuffer_from_hdc( hdc );
+   if (fb == NULL)
+      return FALSE;
+
+   /* If we're swapping the buffer associated with the current context
+    * we have to flush any pending rendering commands first.
+    */
+   st_notify_swapbuffers( fb->stfb );
+
+   st_get_framebuffer_surface( fb->stfb, ST_SURFACE_BACK_LEFT, &surf );
+
+   stw_dev->stw_winsys->flush_frontbuffer(stw_dev->screen->winsys,
+                                          surf,
+                                          hdc );
+
+   return TRUE;
+}