graphics: use budget-aware preferred-device image allocation

src/graphics/host_gpu/vma.cpp

@@ -151,7 +151,8 @@ bool GraphicContext::CreateImage(const vk::ImageCreateInfo& image_info, VulkanIm
 	EXIT_IF(allocator == nullptr || image.image != nullptr || image.allocation != nullptr);
 
 	VmaAllocationCreateInfo alloc_info {};
-	alloc_info.requiredFlags = VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
+	alloc_info.flags = VMA_ALLOCATION_CREATE_WITHIN_BUDGET_BIT;
+	alloc_info.usage = VMA_MEMORY_USAGE_AUTO_PREFER_DEVICE;
 
 	vk::Image::CType native_image = VK_NULL_HANDLE;
 	const auto        result       = static_cast<vk::Result>(

tests/ShaderRecompilerComputeTests.cpp

@@ -2186,9 +2186,9 @@ public:
       VkMemoryPropertyFlags properties{};
       vmaGetAllocationMemoryProperties(graphics.allocator, image.allocation,
                                        &properties);
-      Require(name, "allocation policy",
+      Require(name, "small allocation preference",
               (properties & VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT) != 0,
-              "native image lost its device-local memory requirement");
+              "native image did not prefer available device-local memory");
 
       // A reused presentation image may still describe its previous recording.
       // No commands use this fixture; seed that bookkeeping before retirement.