[d3d11] Cache raw mapped pointer rather than allocation object

Reduces ref counting overhead again and matches previous behaviour.

We should probably do something about the possible case of deferred context
execution with MAP_WRITE_DISCARD followed by MAP_WRITE_NO_OVERWRITE on the
immediate context, but we haven't seen a game rely on this yet.

src/d3d11/d3d11_buffer.cpp

@@ -98,7 +98,7 @@ namespace dxvk {
       info.usage |= VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT;
 
       m_buffer = m_parent->GetDXVKDevice()->importBuffer(info, importInfo, GetMemoryFlags());
-      m_allocation = m_buffer->getAllocation();
+      m_mapPtr = m_buffer->mapPtr(0);
 
       m_mapMode = DetermineMapMode(m_buffer->memFlags());
     } else if (!(pDesc->MiscFlags & D3D11_RESOURCE_MISC_TILE_POOL)) {
@@ -114,12 +114,12 @@ namespace dxvk {
       // Create the buffer and set the entire buffer slice as mapped,
       // so that we only have to update it when invalidating the buffer
       m_buffer = m_parent->GetDXVKDevice()->createBuffer(info, memoryFlags);
-      m_allocation = m_buffer->getAllocation();
+      m_mapPtr = m_buffer->mapPtr(0);
     } else {
       m_sparseAllocator = m_parent->GetDXVKDevice()->createSparsePageAllocator();
       m_sparseAllocator->setCapacity(info.size / SparseMemoryPageSize);
 
-      m_allocation = nullptr;
+      m_mapPtr = nullptr;
       m_mapMode = D3D11_COMMON_BUFFER_MAP_MODE_NONE;
     }
 

src/d3d11/d3d11_buffer.h

@@ -118,12 +118,13 @@ namespace dxvk {
     }
 
     Rc<DxvkResourceAllocation> DiscardSlice(DxvkLocalAllocationCache* cache) {
-      m_allocation = m_buffer->allocateSlice(cache);
-      return m_allocation;
+      auto allocation = m_buffer->allocateSlice(cache);
+      m_mapPtr = allocation->mapPtr();
+      return allocation;
     }
 
-    Rc<DxvkResourceAllocation> GetMappedSlice() const {
-      return m_allocation;
+    void* GetMapPtr() const {
+      return m_mapPtr;
     }
 
     D3D10Buffer* GetD3D10Iface() {
@@ -184,9 +185,10 @@ namespace dxvk {
     Rc<DxvkBuffer>                m_buffer;
     Rc<DxvkBuffer>                m_soCounter;
     Rc<DxvkSparsePageAllocator>   m_sparseAllocator;
-    Rc<DxvkResourceAllocation>    m_allocation;
     uint64_t                      m_seq = 0ull;
 
+    void*                         m_mapPtr = nullptr;
+
     D3D11DXGIResource             m_resource;
     D3D10Buffer                   m_d3d10;
 

src/d3d11/d3d11_context_imm.cpp

@@ -348,7 +348,7 @@ namespace dxvk {
     } else if (likely(MapType == D3D11_MAP_WRITE_NO_OVERWRITE)) {
       // Put this on a fast path without any extra checks since it's
       // a somewhat desired method to partially update large buffers
-      pMappedResource->pData      = pResource->GetMappedSlice()->mapPtr();
+      pMappedResource->pData      = pResource->GetMapPtr();
       pMappedResource->RowPitch   = bufferSize;
       pMappedResource->DepthPitch = bufferSize;
       return S_OK;
@@ -376,10 +376,9 @@ namespace dxvk {
       }
 
       if (doInvalidatePreserve) {
-        auto srcSlice = pResource->GetMappedSlice();
-        auto dstSlice = pResource->DiscardSlice(nullptr);
+        auto srcPtr = pResource->GetMapPtr();
 
-        auto srcPtr = srcSlice->mapPtr();
+        auto dstSlice = pResource->DiscardSlice(nullptr);
         auto dstPtr = dstSlice->mapPtr();
 
         EmitCs([
@@ -398,7 +397,7 @@ namespace dxvk {
         if (!WaitForResource(buffer, sequenceNumber, MapType, MapFlags))
           return DXGI_ERROR_WAS_STILL_DRAWING;
 
-        pMappedResource->pData      = pResource->GetMappedSlice()->mapPtr();
+        pMappedResource->pData      = pResource->GetMapPtr();
         pMappedResource->RowPitch   = bufferSize;
         pMappedResource->DepthPitch = bufferSize;
         return S_OK;
@@ -713,7 +712,7 @@ namespace dxvk {
         ctx->invalidateBuffer(cBuffer, std::move(cBufferSlice));
       });
     } else {
-      mapPtr = pDstBuffer->GetMappedSlice()->mapPtr();
+      mapPtr = pDstBuffer->GetMapPtr();
     }
 
     std::memcpy(reinterpret_cast<char*>(mapPtr) + Offset, pSrcData, Length);

src/d3d11/d3d11_initializer.cpp

@@ -313,4 +313,4 @@ namespace dxvk {
     }
   }
 
-}
+}