[dxvk] Add flag to avoid creating dedicated allocations

src/dxvk/dxvk_memory.cpp

@@ -932,6 +932,9 @@ namespace dxvk {
       dedicatedRequirements.prefersDedicatedAllocation = VK_TRUE;
     }
 
+    if (!dedicatedRequirements.requiresDedicatedAllocation && allocationInfo.mode.test(DxvkAllocationMode::NoDedicated))
+      dedicatedRequirements.prefersDedicatedAllocation = VK_FALSE;
+
     Rc<DxvkResourceAllocation> allocation;
 
     if (!(createInfo.flags & VK_IMAGE_CREATE_SPARSE_BINDING_BIT)) {

src/dxvk/dxvk_memory.h

@@ -959,6 +959,8 @@ namespace dxvk {
     /// If set, the allocation will only succeed if it
     /// can be suballocated from an existing chunk.
     NoAllocation    = 1,
+    /// Avoid using a dedicated allocation for this resource
+    NoDedicated     = 2,
 
     eFlagEnum
   };