From c9f6e65b9b74ca7f0a2eb2459ed0977ad019caaf Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Mon, 9 Dec 2024 14:11:11 +0100
Subject: [PATCH] [dxgi] Use VK_FORMAT_A8_UNORM if supported

---
 src/dxgi/dxgi_format.cpp | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/dxgi/dxgi_format.cpp b/src/dxgi/dxgi_format.cpp
index 306f773ec64..d320f7e17e4 100644
--- a/src/dxgi/dxgi_format.cpp
+++ b/src/dxgi/dxgi_format.cpp
@@ -318,12 +318,10 @@ namespace dxvk {
       VK_FORMAT_R8_UINT,
       VK_IMAGE_ASPECT_COLOR_BIT },
     // DXGI_FORMAT_A8_UNORM
-    { VK_FORMAT_R8_UNORM,
+    { VK_FORMAT_A8_UNORM_KHR,
       VK_FORMAT_UNDEFINED,
       VK_FORMAT_UNDEFINED,
-      VK_IMAGE_ASPECT_COLOR_BIT, 0,
-      { VK_COMPONENT_SWIZZLE_ZERO, VK_COMPONENT_SWIZZLE_ZERO,
-        VK_COMPONENT_SWIZZLE_ZERO, VK_COMPONENT_SWIZZLE_R }},
+      VK_IMAGE_ASPECT_COLOR_BIT },
     // DXGI_FORMAT_R1_UNORM
     { }, // Unsupported
     // DXGI_FORMAT_R9G9B9E5_SHAREDEXP
@@ -860,6 +858,16 @@ namespace dxvk {
       RemapDepthFormat(DXGI_FORMAT_X24_TYPELESS_G8_UINT,  VK_FORMAT_D32_SFLOAT_S8_UINT);
       RemapDepthFormat(DXGI_FORMAT_D24_UNORM_S8_UINT,     VK_FORMAT_D32_SFLOAT_S8_UINT);
     }
+
+    if (!CheckImageFormatSupport(device, VK_FORMAT_A8_UNORM_KHR,
+          VK_FORMAT_FEATURE_2_SAMPLED_IMAGE_BIT |
+          VK_FORMAT_FEATURE_2_STORAGE_IMAGE_BIT |
+          VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BIT)) {
+      Logger::info("DXGI: VK_FORMAT_A8_UNORM_KHR -> VK_FORMAT_R8_UNORM");
+      RemapColorFormat(DXGI_FORMAT_A8_UNORM, VK_FORMAT_R8_UNORM, {
+          VK_COMPONENT_SWIZZLE_ZERO, VK_COMPONENT_SWIZZLE_ZERO,
+          VK_COMPONENT_SWIZZLE_ZERO, VK_COMPONENT_SWIZZLE_R });
+    }
   }