vkd3d: Add descriptor_only_hvv for non-reBAR performance improvements.

Signed-off-by: Tatsuyuki Ishi <ishitatsuyuki@gmail.com>

README.md

@@ -159,6 +159,9 @@ commas or semicolons.
       May free up vital VRAM in certain critical situations, at cost of lower GPU performance.
       A fraction of VRAM is reserved for resizable BAR allocations either way,
       so it should not be a real issue even on lower VRAM cards.
+    - `descriptor_only_hvv` - Same as `no_upload_hvv`, except it allows vkd3d's internal descriptors heaps to be placed
+      on HVV. Useful for small BAR systems (systems without resizable BAR) to prevent UPLOAD heaps from evicting the
+      frequently read descriptor heap.
     - `force_host_cached` - Forces all host visible allocations to be CACHED, which greatly accelerates captures.
     - `no_invariant_position` - Avoids workarounds for invariant position. The workaround is enabled by default.
  - `VKD3D_DEBUG` - controls the debug level for log messages produced by

include/vkd3d.h

@@ -87,6 +87,7 @@ extern "C" {
 #define VKD3D_CONFIG_FLAG_BREADCRUMBS (1ull << 25)
 #define VKD3D_CONFIG_FLAG_PIPELINE_LIBRARY_APP_CACHE_ONLY (1ull << 26)
 #define VKD3D_CONFIG_FLAG_SHADER_CACHE_SYNC (1ull << 27)
+#define VKD3D_CONFIG_FLAG_DESCRIPTOR_ONLY_HVV (1ull << 28)
 
 typedef HRESULT (*PFN_vkd3d_signal_event)(HANDLE event);
 

libs/vkd3d/device.c

@@ -652,6 +652,7 @@ static const struct vkd3d_debug_option vkd3d_config_options[] =
     {"breadcrumbs", VKD3D_CONFIG_FLAG_BREADCRUMBS},
     {"pipeline_library_app_cache", VKD3D_CONFIG_FLAG_PIPELINE_LIBRARY_APP_CACHE_ONLY},
     {"shader_cache_sync", VKD3D_CONFIG_FLAG_SHADER_CACHE_SYNC},
+    {"descriptor_only_hvv", VKD3D_CONFIG_FLAG_DESCRIPTOR_ONLY_HVV},
 };
 
 static void vkd3d_config_flags_init_once(void)

libs/vkd3d/memory.c

@@ -77,7 +77,7 @@ static HRESULT vkd3d_select_memory_flags(struct d3d12_device *device, const D3D1
             *type_flags = VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT;
             if (vkd3d_config_flags & VKD3D_CONFIG_FLAG_FORCE_HOST_CACHED)
                 *type_flags |= VK_MEMORY_PROPERTY_HOST_CACHED_BIT;
-            else if (!(vkd3d_config_flags & VKD3D_CONFIG_FLAG_NO_UPLOAD_HVV))
+            else if (!(vkd3d_config_flags & (VKD3D_CONFIG_FLAG_NO_UPLOAD_HVV | VKD3D_CONFIG_FLAG_DESCRIPTOR_ONLY_HVV)))
                 *type_flags |= VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
             break;
 

libs/vkd3d/resource.c

@@ -6342,7 +6342,7 @@ static uint32_t vkd3d_memory_info_find_global_mask(const struct vkd3d_memory_top
     uint32_t heap_index;
     uint32_t i, mask;
 
-    if (!(vkd3d_config_flags & VKD3D_CONFIG_FLAG_NO_UPLOAD_HVV))
+    if (!(vkd3d_config_flags & (VKD3D_CONFIG_FLAG_NO_UPLOAD_HVV | VKD3D_CONFIG_FLAG_DESCRIPTOR_ONLY_HVV)))
         return UINT32_MAX;
 
     /* If we only have one device local heap, or no host-only heaps, there is nothing to do. */