[d3d11] Introduce DiscardSlice and GetMappedSlice for image resources

These do the same as they do for buffer resources, but for a mapped
image subresource instead.

src/d3d11/d3d11_context_imm.cpp

@@ -391,8 +391,10 @@ namespace dxvk {
           D3D11_MAPPED_SUBRESOURCE*   pMappedResource) {
     const Rc<DxvkImage>  mappedImage  = pResource->GetImage();
     const Rc<DxvkBuffer> mappedBuffer = pResource->GetMappedBuffer(Subresource);
+
+    auto mapMode = pResource->GetMapMode();
     
-    if (unlikely(pResource->GetMapMode() == D3D11_COMMON_TEXTURE_MAP_MODE_NONE)) {
+    if (unlikely(mapMode == D3D11_COMMON_TEXTURE_MAP_MODE_NONE)) {
       Logger::err("D3D11: Cannot map a device-local image");
       return E_INVALIDARG;
     }
@@ -416,32 +418,21 @@ namespace dxvk {
     auto formatInfo = imageFormatInfo(packedFormat);
     auto subresource = pResource->GetSubresourceFromIndex(
       formatInfo->aspectMask, Subresource);
-    
+    void* mapPtr;
-    if (pResource->GetMapMode() == D3D11_COMMON_TEXTURE_MAP_MODE_DIRECT) {
+
+    if (mapMode == D3D11_COMMON_TEXTURE_MAP_MODE_DIRECT) {
       // Wait for the resource to become available
       if (!WaitForResource(mappedImage, MapType, MapFlags))
         return DXGI_ERROR_WAS_STILL_DRAWING;
       
-      // Mark the given subresource as mapped
-      pResource->SetMapType(Subresource, MapType);
-
       // Query the subresource's memory layout and hope that
       // the application respects the returned pitch values.
-      if (pMappedResource) {
+      mapPtr = mappedImage->mapPtr(0);
-        auto layout = pResource->GetSubresourceLayout(formatInfo->aspectMask, Subresource);
-        pMappedResource->pData      = mappedImage->mapPtr(layout.Offset);
-        pMappedResource->RowPitch   = layout.RowPitch;
-        pMappedResource->DepthPitch = layout.DepthPitch;
-      }
-
-      return S_OK;
     } else {
-      DxvkBufferSliceHandle physSlice;
-      
       if (MapType == D3D11_MAP_WRITE_DISCARD) {
         // We do not have to preserve the contents of the
         // buffer if the entire image gets discarded.
-        physSlice = mappedBuffer->allocSlice();
+        DxvkBufferSliceHandle physSlice = pResource->DiscardSlice(Subresource);
         
         EmitCs([
           cImageBuffer = mappedBuffer,
@@ -449,6 +440,8 @@ namespace dxvk {
         ] (DxvkContext* ctx) {
           ctx->invalidateBuffer(cImageBuffer, cBufferSlice);
         });
+
+        mapPtr = physSlice.mapPtr;
       } else {
         // When using any map mode which requires the image contents
         // to be preserved, and if the GPU has write access to the
@@ -463,22 +456,21 @@ namespace dxvk {
         if (!WaitForResource(mappedBuffer, MapType, MapFlags))
           return DXGI_ERROR_WAS_STILL_DRAWING;
         
-        physSlice = mappedBuffer->getSliceHandle();
+        mapPtr = pResource->GetMappedSlice(Subresource).mapPtr;
       }
-      
-      // Mark the given subresource as mapped
-      pResource->SetMapType(Subresource, MapType);
-
-      // Set up map pointer. Data is tightly packed within the mapped buffer.
-      if (pMappedResource) {
-        auto layout = pResource->GetSubresourceLayout(formatInfo->aspectMask, Subresource);
-        pMappedResource->pData      = reinterpret_cast<char*>(physSlice.mapPtr) + layout.Offset;
-        pMappedResource->RowPitch   = layout.RowPitch;
-        pMappedResource->DepthPitch = layout.DepthPitch;
-      }
-
-      return S_OK;
     }
+
+    // Mark the given subresource as mapped
+    pResource->SetMapType(Subresource, MapType);
+
+    if (pMappedResource) {
+      auto layout = pResource->GetSubresourceLayout(formatInfo->aspectMask, Subresource);
+      pMappedResource->pData      = reinterpret_cast<char*>(mapPtr) + layout.Offset;
+      pMappedResource->RowPitch   = layout.RowPitch;
+      pMappedResource->DepthPitch = layout.DepthPitch;
+    }
+
+    return S_OK;
   }
   
   

src/d3d11/d3d11_texture.cpp

@@ -542,7 +542,7 @@ namespace dxvk {
   }
   
   
-  Rc<DxvkBuffer> D3D11CommonTexture::CreateMappedBuffer(UINT MipLevel) const {
+  D3D11CommonTexture::MappedBuffer D3D11CommonTexture::CreateMappedBuffer(UINT MipLevel) const {
     const DxvkFormatInfo* formatInfo = imageFormatInfo(
       m_device->LookupPackedFormat(m_desc.Format, GetFormatMode()).Format);
     
@@ -561,7 +561,10 @@ namespace dxvk {
     if (m_desc.Usage == D3D11_USAGE_STAGING)
       memType |= VK_MEMORY_PROPERTY_HOST_CACHED_BIT;
     
-    return m_device->GetDXVKDevice()->createBuffer(info, memType);
+    MappedBuffer result;
+    result.buffer = m_device->GetDXVKDevice()->createBuffer(info, memType);
+    result.slice = result.buffer->getSliceHandle();
+    return result;
   }
   
   

src/d3d11/d3d11_texture.h

@@ -168,9 +168,37 @@ namespace dxvk {
      */
     Rc<DxvkBuffer> GetMappedBuffer(UINT Subresource) const {
       return Subresource < m_buffers.size()
-        ? m_buffers[Subresource]
+        ? m_buffers[Subresource].buffer
         : Rc<DxvkBuffer>();
     }
+
+    /**
+     * \brief Discards mapped buffer slice for a given subresource
+     *
+     * \param [in] Subresource Subresource to discard
+     * \returns Newly allocated mapped buffer slice
+     */
+    DxvkBufferSliceHandle DiscardSlice(UINT Subresource) {
+      if (Subresource < m_buffers.size()) {
+        DxvkBufferSliceHandle slice = m_buffers[Subresource].buffer->allocSlice();
+        m_buffers[Subresource].slice = slice;
+        return slice;
+      } else {
+        return DxvkBufferSliceHandle();
+      }
+    }
+
+    /**
+     * \brief Retrieves mapped buffer slice for a given subresource
+     *
+     * \param [in] Subresource Subresource index to query
+     * \returns Currently mapped buffer slice
+     */
+    DxvkBufferSliceHandle GetMappedSlice(UINT Subresource) const {
+      return Subresource < m_buffers.size()
+        ? m_buffers[Subresource].slice
+        : DxvkBufferSliceHandle();
+    }
     
     /**
      * \brief Checks whether we can update the mapped buffer early
@@ -258,6 +286,11 @@ namespace dxvk {
     
   private:
     
+    struct MappedBuffer {
+      Rc<DxvkBuffer>        buffer;
+      DxvkBufferSliceHandle slice;
+    };
+
     D3D11Device* const            m_device;
     D3D11_RESOURCE_DIMENSION      m_dimension;
     D3D11_COMMON_TEXTURE_DESC     m_desc;
@@ -265,10 +298,10 @@ namespace dxvk {
     DXGI_USAGE                    m_dxgiUsage;
     
     Rc<DxvkImage>                 m_image;
-    std::vector<Rc<DxvkBuffer>>   m_buffers;
+    std::vector<MappedBuffer>     m_buffers;
     std::vector<D3D11_MAP>        m_mapTypes;
     
-    Rc<DxvkBuffer> CreateMappedBuffer(
+    MappedBuffer CreateMappedBuffer(
             UINT                  MipLevel) const;
     
     BOOL CheckImageSupport(