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#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;
}
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