From: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Date: Wed, 1 Jul 2020 05:50:08 +0000 (+0200)
Subject: Revert "vulkan/wsi/x11: Ensure we create at least minImageCount images."
X-Git-Url: https://git.libre-soc.org/?p=mesa.git;a=commitdiff_plain;h=311b9f25834d9ad6ad91f9eb41ec77ab71ab2a73

Revert "vulkan/wsi/x11: Ensure we create at least minImageCount images."

This breaks some games like Wolfenstein Youngblood or Wolfenstein 2
that crash at launch if the number of images is more than what they
expected.

We could add vk_x11_strict_image_count to fix these game bugs but
it seems more conservative to revert that change and add a new wsi
drirc workaround for Doom Eternal.

This reverts commit 5f97dfc4c848cb6388ec138c19a22a8a880901d1.

Cc: 20.1 <mesa-stable@lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5704>
---

diff --git a/src/vulkan/wsi/wsi_common_x11.c b/src/vulkan/wsi/wsi_common_x11.c
index 8dbd6eebf5d..fd275ce7930 100644
--- a/src/vulkan/wsi/wsi_common_x11.c
+++ b/src/vulkan/wsi/wsi_common_x11.c
@@ -450,33 +450,6 @@ x11_surface_get_support(VkIcdSurfaceBase *icd_surface,
    return VK_SUCCESS;
 }
 
-
-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;
-}
 static VkResult
 x11_surface_get_capabilities(VkIcdSurfaceBase *icd_surface,
                              struct wsi_device *wsi_device,
@@ -529,10 +502,31 @@ x11_surface_get_capabilities(VkIcdSurfaceBase *icd_surface,
                                       VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
    }
 
-   caps->minImageCount = x11_get_min_image_count(wsi_device);
+   /* 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.
+    */
+   caps->minImageCount = 3;
    /* There is no real maximum */
    caps->maxImageCount = 0;
 
+   if (wsi_device->x11.override_minImageCount)
+      caps->minImageCount = wsi_device->x11.override_minImageCount;
+
    caps->supportedTransforms = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
    caps->currentTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
    caps->maxImageArrayLayers = 1;
@@ -1442,12 +1436,10 @@ x11_surface_create_swapchain(VkIcdSurfaceBase *icd_surface,
    assert(pCreateInfo->sType == VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR);
 
    unsigned num_images = pCreateInfo->minImageCount;
-   if (!wsi_device->x11.strict_imageCount) {
-      if (present_mode == VK_PRESENT_MODE_MAILBOX_KHR)
-         num_images = MAX2(num_images, 5);
-
-      num_images = MAX2(num_images, x11_get_min_image_count(wsi_device));
-   }
+   if (wsi_device->x11.strict_imageCount)
+      num_images = pCreateInfo->minImageCount;
+   else if (present_mode == VK_PRESENT_MODE_MAILBOX_KHR)
+      num_images = MAX2(num_images, 5);
 
    xcb_connection_t *conn = x11_surface_get_connection(icd_surface);
    struct wsi_x11_connection *wsi_conn =