+ struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
+
+ return swap_buffers(drv, dpy, surf, 0, NULL,
+ (gsurf->base.SwapBehavior == EGL_BUFFER_PRESERVED));
+}
+
+#ifdef EGL_NOK_swap_region
+static EGLBoolean
+egl_g3d_swap_buffers_region(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
+ EGLint num_rects, const EGLint *rects)
+{
+ /* Note: y=0=top */
+ return swap_buffers(drv, dpy, surf, num_rects, rects, EGL_TRUE);
+}
+#endif /* EGL_NOK_swap_region */
+
+static EGLBoolean
+egl_g3d_post_sub_buffer(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
+ EGLint x, EGLint y, EGLint width, EGLint height)
+{
+ EGLint rect[4];
+
+ if (x < 0 || y < 0 || width < 0 || height < 0)
+ return _eglError(EGL_BAD_PARAMETER, "eglPostSubBufferNV");
+
+ /* clamp */
+ if (x + width > surf->Width)
+ width = surf->Width - x;
+ if (y + height > surf->Height)
+ height = surf->Height - y;