[PATCH v2 1/2] vkd3d: Deal with Map out parameter being NULL.

[Hans-Kristian Arntzen]

It is possible to map a resource, but not disclose the VA to caller.
This is used for WriteToSubresource.

Signed-off-by: Hans-Kristian Arntzen 
---
 libs/vkd3d/resource.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/libs/vkd3d/resource.c b/libs/vkd3d/resource.c
index aebe1fa..4186155 100644
--- a/libs/vkd3d/resource.c
+++ b/libs/vkd3d/resource.c
@@ -423,7 +423,8 @@ static HRESULT d3d12_heap_map(struct d3d12_heap *heap, uint64_t offset,
     if ((rc = pthread_mutex_lock(&heap->mutex)))
     {
         ERR("Failed to lock mutex, error %d.\n", rc);
-        *data = NULL;
+        if (data)
+            *data = NULL;
         return hresult_from_errno(rc);
     }

@@ -456,13 +457,15 @@ static HRESULT d3d12_heap_map(struct d3d12_heap *heap, uint64_t offset,
     if (hr == S_OK)
     {
         assert(heap->map_ptr);
-        *data = (BYTE *)heap->map_ptr + offset;
+        if (data)
+            *data = (BYTE *)heap->map_ptr + offset;
         ++resource->map_count;
     }
     else
     {
         assert(!heap->map_ptr);
-        *data = NULL;
+        if (data)
+            *data = NULL;
     }

pthread_mutex_unlock(&heap->mutex);
@@ -1235,7 +1238,8 @@ static HRESULT STDMETHODCALLTYPE d3d12_resource_Map(ID3D12Resource *iface, UINT
     if (FAILED(hr = d3d12_heap_map(resource->heap, resource->heap_offset, resource, data)))
         WARN("Failed to map resource %p, hr %#x.\n", resource, hr);

-    TRACE("Returning pointer %p.\n", *data);
+    if (data)
+        TRACE("Returning pointer %p.\n", *data);

return hr;
 }