[PATCH vkd3d 2/2] vkd3d: Map copy queues to compute queues if necessary and supported.

[Conor McCarthy]

In cases where there is only one or a small number of direct queues,
mapping copy to compute may prevent a fence deadlock caused by sending a
wait and signal to the same Vk queue.

Signed-off-by: Conor McCarthy 
---
 libs/vkd3d/device.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/libs/vkd3d/device.c b/libs/vkd3d/device.c
index ce570ffe..6d2f30ea 100644
--- a/libs/vkd3d/device.c
+++ b/libs/vkd3d/device.c
@@ -1767,8 +1767,18 @@ static HRESULT vkd3d_select_queues(const struct vkd3d_instance *vkd3d_instance,
     }
     if (info->family_index[VKD3D_QUEUE_FAMILY_TRANSFER] == ~0u)
     {
-        info->family_index[VKD3D_QUEUE_FAMILY_TRANSFER] = info->family_index[VKD3D_QUEUE_FAMILY_DIRECT];
-        info->vk_properties[VKD3D_QUEUE_FAMILY_TRANSFER] = info->vk_properties[VKD3D_QUEUE_FAMILY_DIRECT];
+        if ((info->vk_properties[VKD3D_QUEUE_FAMILY_COMPUTE].queueFlags & VK_QUEUE_TRANSFER_BIT)
+                && info->vk_properties[VKD3D_QUEUE_FAMILY_COMPUTE].queueCount
+                >= info->vk_properties[VKD3D_QUEUE_FAMILY_DIRECT].queueCount)
+        {
+            info->family_index[VKD3D_QUEUE_FAMILY_TRANSFER] = info->family_index[VKD3D_QUEUE_FAMILY_COMPUTE];
+            info->vk_properties[VKD3D_QUEUE_FAMILY_TRANSFER] = info->vk_properties[VKD3D_QUEUE_FAMILY_COMPUTE];
+        }
+        else
+        {
+            info->family_index[VKD3D_QUEUE_FAMILY_TRANSFER] = info->family_index[VKD3D_QUEUE_FAMILY_DIRECT];
+            info->vk_properties[VKD3D_QUEUE_FAMILY_TRANSFER] = info->vk_properties[VKD3D_QUEUE_FAMILY_DIRECT];
+        }
     }

/* Compact the array. */