From 571a2d5811c48bd0498534d104cacd979638b1ac Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Mon, 7 Oct 2024 13:32:46 +0200
Subject: [PATCH] [dxvk] Tweak staging memory allocation behaviour

---
 src/dxvk/dxvk_memory.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/dxvk/dxvk_memory.cpp b/src/dxvk/dxvk_memory.cpp
index 8c0a158b2..5ecaa0c00 100644
--- a/src/dxvk/dxvk_memory.cpp
+++ b/src/dxvk/dxvk_memory.cpp
@@ -458,6 +458,12 @@ namespace dxvk {
 
       type.devicePool.maxChunkSize = determineMaxChunkSize(type, false);
       type.mappedPool.maxChunkSize = determineMaxChunkSize(type, true);
+
+      // Uncached system memory is going to be used for large temporary allocations
+      // during resource creation. Account for that by always using full-sized chunks.
+      if ((type.properties.propertyFlags & VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT)
+       && !(type.properties.propertyFlags & (VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT | VK_MEMORY_PROPERTY_HOST_CACHED_BIT)))
+        type.mappedPool.nextChunkSize = type.mappedPool.maxChunkSize;
     }
 
     determineMemoryTypesWithPropertyFlags();