+
+static uint32_t
+x11_get_min_image_count(struct wsi_device *wsi_device)
+{
+ if (wsi_device->x11.override_minImageCount)
+ return wsi_device->x11.override_minImageCount;
+
+ /* For IMMEDIATE and FIFO, most games work in a pipelined manner where the
+ * can produce frames at a rate of 1/MAX(CPU duration, GPU duration), but
+ * the render latency is CPU duration + GPU duration.
+ *
+ * This means that with scanout from pageflipping we need 3 frames to run
+ * full speed:
+ * 1) CPU rendering work
+ * 2) GPU rendering work
+ * 3) scanout
+ *
+ * Once we have a nonblocking acquire that returns a semaphore we can merge
+ * 1 and 3. Hence the ideal implementation needs only 2 images, but games
+ * cannot tellwe currently do not have an ideal implementation and that
+ * hence they need to allocate 3 images. So let us do it for them.
+ *
+ * This is a tradeoff as it uses more memory than needed for non-fullscreen
+ * and non-performance intensive applications.
+ */
+ return 3;
+}