+/**
+ * Queue a composition.
+ *
+ * It will drop the lock on success.
+ */
+BOOL
+stw_framebuffer_present_locked(HDC hdc,
+ struct stw_framebuffer *fb,
+ struct pipe_surface *surface)
+{
+ if(stw_dev->callbacks.wglCbPresentBuffers &&
+ stw_dev->stw_winsys->compose) {
+ GLCBPRESENTBUFFERSDATA data;
+
+ memset(&data, 0, sizeof data);
+ data.magic1 = 2;
+ data.magic2 = 0;
+ data.AdapterLuid = stw_dev->AdapterLuid;
+ data.rect = fb->client_rect;
+ data.pPrivateData = (void *)surface;
+
+ stw_framebuffer_release(fb);
+
+ return stw_dev->callbacks.wglCbPresentBuffers(hdc, &data);
+ }
+ else {
+ struct pipe_screen *screen = stw_dev->screen;
+
+#ifdef DEBUG
+ if(stw_dev->trace_running) {
+ screen = trace_screen(screen)->screen;
+ surface = trace_surface(surface)->surface;
+ }
+#endif
+
+ stw_dev->stw_winsys->present( screen, surface, hdc );
+
+ stw_framebuffer_update(fb);
+
+ stw_framebuffer_release(fb);
+
+ return TRUE;
+ }
+}
+
+
+BOOL APIENTRY
+DrvSwapBuffers(
+ HDC hdc )
+{
+ struct stw_framebuffer *fb;
+ struct pipe_surface *surface = NULL;
+
+ fb = stw_framebuffer_from_hdc( hdc );
+ if (fb == NULL)
+ return FALSE;
+
+ if (!(fb->pfi->pfd.dwFlags & PFD_DOUBLEBUFFER)) {
+ stw_framebuffer_release(fb);
+ return TRUE;
+ }
+
+ st_swapbuffers(fb->stfb, &surface, NULL);
+
+ return stw_framebuffer_present_locked(hdc, fb, surface);
+}
+
+