wined3d: Do not use a staging buffer if discarding a mappable buffer in…

dlls/wined3d/adapter_vk.c

@@ -1007,6 +1007,7 @@ static void adapter_vk_copy_bo_address(struct wined3d_context *context,
     struct wined3d_bo_vk staging_bo, *src_bo, *dst_bo;
     VkAccessFlags src_access_mask, dst_access_mask;
     VkBufferMemoryBarrier vk_barrier[2];
+    DWORD map_flags = WINED3D_MAP_WRITE;
     struct wined3d_bo_address staging;
     VkCommandBuffer vk_command_buffer;
     struct wined3d_range range;
@@ -1016,6 +1017,9 @@ static void adapter_vk_copy_bo_address(struct wined3d_context *context,
     src_bo = (struct wined3d_bo_vk *)src->buffer_object;
     dst_bo = (struct wined3d_bo_vk *)dst->buffer_object;
 
+    if (dst_bo && !dst->addr && size == dst_bo->size)
+        map_flags |= WINED3D_MAP_DISCARD;
+
     if (src_bo && dst_bo)
     {
         if (!(vk_command_buffer = wined3d_context_vk_get_command_buffer(context_vk)))
@@ -1092,8 +1096,8 @@ static void adapter_vk_copy_bo_address(struct wined3d_context *context,
         return;
     }
 
-    if (dst_bo && (dst_bo->command_buffer_id > context_vk->completed_command_buffer_id
-            || !(dst_bo->memory_type & VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT)))
+    if (dst_bo && (!(dst_bo->memory_type & VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT) || (!(map_flags & WINED3D_MAP_DISCARD)
+            && dst_bo->command_buffer_id > context_vk->completed_command_buffer_id)))
     {
         if (!(wined3d_context_vk_create_bo(context_vk, size, VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
                 VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, &staging_bo)))
@@ -1113,7 +1117,7 @@ static void adapter_vk_copy_bo_address(struct wined3d_context *context,
     }
 
     src_ptr = adapter_vk_map_bo_address(context, src, size, WINED3D_MAP_READ);
-    dst_ptr = adapter_vk_map_bo_address(context, dst, size, WINED3D_MAP_WRITE);
+    dst_ptr = adapter_vk_map_bo_address(context, dst, size, map_flags);
 
     memcpy(dst_ptr, src_ptr, size);