1 files changed, 51 insertions, 0 deletions
diff --git a/Whisper/D3D/createBuffer.cpp b/Whisper/D3D/createBuffer.cpp
new file mode 100644
index 0000000..3fbb13e
--- /dev/null
+++ b/Whisper/D3D/createBuffer.cpp
@@ -0,0 +1,51 @@
+#include "stdafx.h"
+#include "createBuffer.h"
+
+#define CHECK( hr ) { const HRESULT __hr = ( hr ); if( FAILED( __hr ) ) return __hr; }
+
+HRESULT DirectCompute::createBuffer( eBufferUse use, size_t totalBytes, ID3D11Buffer** ppGpuBuffer, const void* rsi, ID3D11Buffer** ppStagingBuffer )
+{
+	if( totalBytes > INT_MAX )
+		return DISP_E_OVERFLOW;
+	if( nullptr == ppGpuBuffer )
+		return E_POINTER;
+
+	CD3D11_BUFFER_DESC bufferDesc{ (UINT)totalBytes, D3D11_BIND_SHADER_RESOURCE };
+	switch( use )
+	{
+	case eBufferUse::Immutable:
+		if( nullptr == rsi )
+			return E_INVALIDARG;
+		bufferDesc.Usage = D3D11_USAGE_IMMUTABLE;
+		break;
+	case eBufferUse::ReadWrite:
+	case eBufferUse::ReadWriteDownload:
+		bufferDesc.BindFlags |= D3D11_BIND_UNORDERED_ACCESS;
+		break;
+	case eBufferUse::Dynamic:
+		bufferDesc.Usage = D3D11_USAGE_DYNAMIC;
+		bufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
+		break;
+	}
+
+	D3D11_SUBRESOURCE_DATA srd;
+	D3D11_SUBRESOURCE_DATA* pSrd = nullptr;
+	if( nullptr != rsi )
+	{
+		srd.pSysMem = rsi;
+		srd.SysMemPitch = srd.SysMemSlicePitch = 0;
+		pSrd = &srd;
+	}
+
+	CHECK( device()->CreateBuffer( &bufferDesc, pSrd, ppGpuBuffer ) );
+
+	if( nullptr != ppStagingBuffer && use == eBufferUse::ReadWriteDownload )
+	{
+		bufferDesc.Usage = D3D11_USAGE_STAGING;
+		bufferDesc.BindFlags = 0;
+		bufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
+		CHECK( device()->CreateBuffer( &bufferDesc, nullptr, ppStagingBuffer ) );
+	}
+
+	return S_OK;
+}
+\ No newline at end of file