template project, first version

DirectXTK/Src/ConstantBuffer.h

@@ -0,0 +1,115 @@
+//--------------------------------------------------------------------------------------
+// File: ConstantBuffer.h
+//
+// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
+// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
+// PARTICULAR PURPOSE.
+//
+// Copyright (c) Microsoft Corporation. All rights reserved.
+//
+// http://go.microsoft.com/fwlink/?LinkId=248929
+//--------------------------------------------------------------------------------------
+
+#pragma once
+
+#include "DirectXHelpers.h"
+#include "GraphicsMemory.h"
+#include "PlatformHelpers.h"
+
+
+namespace DirectX
+{
+    // Strongly typed wrapper around a D3D constant buffer.
+    template<typename T>
+    class ConstantBuffer
+    {
+    public:
+        // Constructor.
+        ConstantBuffer() = default;
+        explicit ConstantBuffer(_In_ ID3D11Device* device)
+        {
+            Create( device );
+        }
+
+        ConstantBuffer(ConstantBuffer const&) = delete;
+        ConstantBuffer& operator= (ConstantBuffer const&) = delete;
+
+        #if defined(_XBOX_ONE) && defined(_TITLE)
+        void Create(_In_ ID3D11Device* device)
+        {
+            D3D11_BUFFER_DESC desc = {};
+
+            desc.ByteWidth = sizeof(T);
+            desc.Usage = D3D11_USAGE_DEFAULT;
+            desc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
+            desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
+
+            Microsoft::WRL::ComPtr<ID3D11DeviceX> deviceX;
+            ThrowIfFailed(device->QueryInterface(IID_GRAPHICS_PPV_ARGS(deviceX.GetAddressOf())));
+
+            ThrowIfFailed(deviceX->CreatePlacementBuffer(&desc, nullptr, mConstantBuffer.ReleaseAndGetAddressOf()));
+
+            SetDebugObjectName(mConstantBuffer.Get(), L"DirectXTK");
+        }
+
+
+        // Writes new data into the constant buffer.
+        void SetData(_In_ ID3D11DeviceContext* deviceContext, T const& value, void** grfxMemory)
+        {
+            assert( grfxMemory != 0 );
+
+            void* ptr = GraphicsMemory::Get().Allocate( deviceContext, sizeof(T), 64 );
+            assert( ptr != 0 );
+
+            *(T*)ptr = value;
+
+            *grfxMemory = ptr;
+        }
+        #else
+        void Create(_In_ ID3D11Device* device)
+        {
+            D3D11_BUFFER_DESC desc = {};
+
+            desc.ByteWidth = sizeof(T);
+            desc.Usage = D3D11_USAGE_DYNAMIC;
+            desc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
+            desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
+
+            ThrowIfFailed(
+                device->CreateBuffer(&desc, nullptr, mConstantBuffer.ReleaseAndGetAddressOf() )
+            );
+
+            SetDebugObjectName(mConstantBuffer.Get(), "DirectXTK");
+        }
+
+
+        // Writes new data into the constant buffer.
+        void SetData(_In_ ID3D11DeviceContext* deviceContext, T const& value)
+        {
+            assert( mConstantBuffer.Get() != 0 );
+
+            D3D11_MAPPED_SUBRESOURCE mappedResource;
+            
+            ThrowIfFailed(
+                deviceContext->Map(mConstantBuffer.Get(), 0, D3D11_MAP_WRITE_DISCARD, 0, &mappedResource)
+            );
+
+            *(T*)mappedResource.pData = value;
+
+            deviceContext->Unmap(mConstantBuffer.Get(), 0);
+        }
+        #endif
+
+        // Looks up the underlying D3D constant buffer.
+        ID3D11Buffer* GetBuffer()
+        {
+            return mConstantBuffer.Get();
+        }
+
+
+    private:
+        // The underlying D3D object.
+        Microsoft::WRL::ComPtr<ID3D11Buffer> mConstantBuffer;
+    };
+}