Few minor cosmetic code changes in D3D12 backend

8 files changed, 19 insertions, 19 deletions

diff --git a/Graphics/GraphicsEngineD3D12/include/CommandContext.h b/Graphics/GraphicsEngineD3D12/include/CommandContext.h
index c3b0d6f7..a766c56f 100644
--- a/Graphics/GraphicsEngineD3D12/include/CommandContext.h
+++ b/Graphics/GraphicsEngineD3D12/include/CommandContext.h
@@ -116,7 +116,12 @@ public:
     void SetID(const Char* ID) { m_ID = ID; }
     ID3D12GraphicsCommandList *GetCommandList(){return m_pCommandList;}
     
-    DescriptorHeapAllocation AllocateDynamicGPUVisibleDescriptor( D3D12_DESCRIPTOR_HEAP_TYPE Type, UINT Count = 1 );
+    DescriptorHeapAllocation AllocateDynamicGPUVisibleDescriptor( D3D12_DESCRIPTOR_HEAP_TYPE Type, UINT Count = 1 )
+    {
+        VERIFY(m_DynamicGPUDescriptorAllocators != nullptr, "Dynamic GPU descriptor llocators have not been initialized. Did you forget to call SetDynamicGPUDescriptorAllocators() after resetting the context?");
+        VERIFY(Type >= D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV && Type <= D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER, "Invalid heap type");
+        return m_DynamicGPUDescriptorAllocators[Type].Allocate(Count);
+    }
 
     void InsertUAVBarrier(D3D12ResourceBase& Resource, IDeviceObject &Object, bool FlushImmediate = false);
 
diff --git a/Graphics/GraphicsEngineD3D12/include/RenderDeviceD3D12Impl.h b/Graphics/GraphicsEngineD3D12/include/RenderDeviceD3D12Impl.h
index 64978ea0..b0d6ba05 100644
--- a/Graphics/GraphicsEngineD3D12/include/RenderDeviceD3D12Impl.h
+++ b/Graphics/GraphicsEngineD3D12/include/RenderDeviceD3D12Impl.h
@@ -78,7 +78,7 @@ public:
     DescriptorHeapAllocation AllocateDescriptor( D3D12_DESCRIPTOR_HEAP_TYPE Type, UINT Count = 1 );
     DescriptorHeapAllocation AllocateGPUDescriptors( D3D12_DESCRIPTOR_HEAP_TYPE Type, UINT Count = 1 );
 
-	void IdleGPU(bool ReleaseStaleObjects);
+	void IdleGPU();
 
     using PooledCommandContext = std::unique_ptr<CommandContext, STDDeleterRawMem<CommandContext> >;
     PooledCommandContext AllocateCommandContext(const Char *ID = "");
diff --git a/Graphics/GraphicsEngineD3D12/src/BufferD3D12Impl.cpp b/Graphics/GraphicsEngineD3D12/src/BufferD3D12Impl.cpp
index 3c6ca015..5d11cdf9 100644
--- a/Graphics/GraphicsEngineD3D12/src/BufferD3D12Impl.cpp
+++ b/Graphics/GraphicsEngineD3D12/src/BufferD3D12Impl.cpp
@@ -328,7 +328,7 @@ void BufferD3D12Impl :: Map(IDeviceContext* pContext, MAP_TYPE MapType, Uint32 M
         LOG_WARNING_MESSAGE_ONCE("Mapping CPU buffer for reading on D3D12 currently requires flushing context and idling GPU");
         pDeviceContextD3D12->Flush();
         auto *pDeviceD3D12 = ValidatedCast<RenderDeviceD3D12Impl>(GetDevice());
-        pDeviceD3D12->IdleGPU(false);
+        pDeviceD3D12->IdleGPU();
 
         VERIFY(m_Desc.Usage == USAGE_CPU_ACCESSIBLE, "Buffer must be created as USAGE_CPU_ACCESSIBLE to be mapped for reading");
         D3D12_RANGE MapRange;
diff --git a/Graphics/GraphicsEngineD3D12/src/CommandContext.cpp b/Graphics/GraphicsEngineD3D12/src/CommandContext.cpp
index c0236a4a..05419ac2 100644
--- a/Graphics/GraphicsEngineD3D12/src/CommandContext.cpp
+++ b/Graphics/GraphicsEngineD3D12/src/CommandContext.cpp
@@ -290,10 +290,4 @@ void CommandContext::InsertAliasBarrier(D3D12ResourceBase& Before, D3D12Resource
         FlushResourceBarriers();
 }
 
-DescriptorHeapAllocation CommandContext::AllocateDynamicGPUVisibleDescriptor( D3D12_DESCRIPTOR_HEAP_TYPE Type, UINT Count )
-{
-    VERIFY(Type >= D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV && Type <= D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER, "Invalid heap type");
-    return m_DynamicGPUDescriptorAllocators[Type].Allocate(Count);
-}
-
 }
diff --git a/Graphics/GraphicsEngineD3D12/src/DescriptorHeap.cpp b/Graphics/GraphicsEngineD3D12/src/DescriptorHeap.cpp
index d17e88a0..cd9ac42a 100644
--- a/Graphics/GraphicsEngineD3D12/src/DescriptorHeap.cpp
+++ b/Graphics/GraphicsEngineD3D12/src/DescriptorHeap.cpp
@@ -403,7 +403,8 @@ DynamicSuballocationsManager::~DynamicSuballocationsManager()
 void DynamicSuballocationsManager::ReleaseAllocations(Uint64 CmdQueueMask)
 {
     // Clear the list and dispose all allocated chunks of GPU descriptor heap.
-    // The chunks will be added to the release queue in the allocations manager
+    // The chunks will be added to release queues and eventually returned to the 
+    // parent GPU heap.
     for(auto& Allocation : m_Suballocations)
     {
         m_ParentGPUHeap.Free(std::move(Allocation), CmdQueueMask);
@@ -425,7 +426,7 @@ DescriptorHeapAllocation DynamicSuballocationsManager::Allocate(Uint32 Count)
         // Request a new chunk from the parent GPU descriptor heap
         auto SuballocationSize = std::max(m_DynamicChunkSize, Count);
         auto NewDynamicSubAllocation = m_ParentGPUHeap.AllocateDynamic(SuballocationSize);
-        if (NewDynamicSubAllocation.GetCpuHandle().ptr == 0)
+        if (NewDynamicSubAllocation.IsNull())
         {
             LOG_ERROR_MESSAGE("Failed to suballocate region for dynamic descriptors");
             return DescriptorHeapAllocation();
@@ -438,7 +439,7 @@ DescriptorHeapAllocation DynamicSuballocationsManager::Allocate(Uint32 Count)
     }
 
     // Perform suballocation from the last chunk
-    auto &CurrentSuballocation = m_Suballocations.back();
+    auto& CurrentSuballocation = m_Suballocations.back();
     
     auto ManagerId = CurrentSuballocation.GetAllocationManagerId();
     VERIFY(ManagerId < std::numeric_limits<Uint16>::max(), "ManagerID exceed allowed limit");
diff --git a/Graphics/GraphicsEngineD3D12/src/DeviceContextD3D12Impl.cpp b/Graphics/GraphicsEngineD3D12/src/DeviceContextD3D12Impl.cpp
index c9aa0f6a..263e4ecd 100644
--- a/Graphics/GraphicsEngineD3D12/src/DeviceContextD3D12Impl.cpp
+++ b/Graphics/GraphicsEngineD3D12/src/DeviceContextD3D12Impl.cpp
@@ -578,8 +578,11 @@ namespace Diligent
     {
         VERIFY_EXPR(m_bIsDeferred || m_SubmittedBuffersCmdQueueMask == (Uint64{1}<<m_CommandQueueId));
 
+        // Released pages are returned to the global dynamic memory manager hosted by render device.
         m_DynamicHeap.ReleaseAllocatedPages(m_SubmittedBuffersCmdQueueMask);
         
+        // Dynamic GPU descriptor allocations are returned to the global GPU descriptor heap
+        // hosted by the render device.
         for(size_t i=0; i < _countof(m_DynamicGPUDescriptorAllocator); ++i)
             m_DynamicGPUDescriptorAllocator[i].ReleaseAllocations(m_SubmittedBuffersCmdQueueMask);
 
diff --git a/Graphics/GraphicsEngineD3D12/src/RenderDeviceD3D12Impl.cpp b/Graphics/GraphicsEngineD3D12/src/RenderDeviceD3D12Impl.cpp
index bf4fd7e4..cfe7e24c 100644
--- a/Graphics/GraphicsEngineD3D12/src/RenderDeviceD3D12Impl.cpp
+++ b/Graphics/GraphicsEngineD3D12/src/RenderDeviceD3D12Impl.cpp
@@ -89,7 +89,7 @@ RenderDeviceD3D12Impl :: RenderDeviceD3D12Impl(IReferenceCounters*          pRef
 RenderDeviceD3D12Impl::~RenderDeviceD3D12Impl()
 {
     // Wait for the GPU to complete all its operations
-    IdleGPU(true);
+    IdleGPU();
     ReleaseStaleResources(true);
 
 #ifdef DEVELOPMENT
@@ -193,12 +193,9 @@ Uint64 RenderDeviceD3D12Impl::CloseAndExecuteCommandContext(Uint32 QueueIndex, P
 }
 
 
-void RenderDeviceD3D12Impl::IdleGPU(bool ReleaseStaleObjects) 
+void RenderDeviceD3D12Impl::IdleGPU() 
 { 
-    // Do not wait until the end of the frame and force deletion. 
-    // It is necessary to release outstanding references to the
-    // swap chain buffers when it is resized in the middle of the frame.
-    IdleCommandQueues(ReleaseStaleObjects);
+    IdleCommandQueues(true);
 }
 
 void RenderDeviceD3D12Impl::FlushStaleResources(Uint32 CmdQueueIndex)
diff --git a/Graphics/GraphicsEngineD3D12/src/SwapChainD3D12Impl.cpp b/Graphics/GraphicsEngineD3D12/src/SwapChainD3D12Impl.cpp
index 423d73ce..4fcf8df9 100644
--- a/Graphics/GraphicsEngineD3D12/src/SwapChainD3D12Impl.cpp
+++ b/Graphics/GraphicsEngineD3D12/src/SwapChainD3D12Impl.cpp
@@ -172,7 +172,7 @@ void SwapChainD3D12Impl::UpdateSwapChain(bool CreateNew)
 
             // This will release references to D3D12 swap chain buffers hold by
             // m_pBackBufferRTV[]
-            pDeviceD3D12->IdleGPU(true);
+            pDeviceD3D12->IdleGPU();
 
             if(CreateNew)
             {