vulkan: add vk_x11_strict_image_count option

This option strictly allocate the minImageCount given by the
application at swapchain creation.

This works around application that do not deal with the fact that the
implementation allocates more images than the minimum specified.

v2: Add values in default drirc (Bas)

v3: specify engine name/version (Lionel)

Signed-off-by: Lionel Landwerlin <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111522
Reviewed-by: Bas Nieuwenhuizen <[email protected]>
Reviewed-by: Eric Engestrom <[email protected]>
Cc: 19.2 <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/vulkan/wsi/wsi_common.h b/src/vulkan/wsi/wsi_common.h
index b00fc3c1857..064b16a5e7a 100644
--- a/src/vulkan/wsi/wsi_common.h
+++ b/src/vulkan/wsi/wsi_common.h
@@ -113,6 +113,11 @@ struct wsi_device {
       /* Override the minimum number of images on the swapchain.
        * 0 = no override */
       uint32_t override_minImageCount;
+
+      /* Forces strict number of image on the swapchain using application
+       * provided VkSwapchainCreateInfoKH::RminImageCount.
+       */
+      bool strict_imageCount;
    } x11;
 
    uint64_t (*image_get_modifier)(VkImage image);