/*
* Copyright 1993-2018 NVIDIA Corporation.  All rights reserved.
*
* Please refer to the NVIDIA end user license agreement (EULA) associated
* with this source code for terms and conditions that govern your use of
* this software. Any use, reproduction, disclosure, or distribution of
* this software and related documentation outside the terms of the EULA
* is strictly prohibited.
*
*/


#include "stdafx.h"
#include "simpleD3D12.h"
#include <aclapi.h>

//////////////////////////////////////////////
// WindowsSecurityAttributes implementation //
//////////////////////////////////////////////

class WindowsSecurityAttributes {
protected:
	SECURITY_ATTRIBUTES m_winSecurityAttributes;
	PSECURITY_DESCRIPTOR m_winPSecurityDescriptor;

public:
	WindowsSecurityAttributes();
	~WindowsSecurityAttributes();
	SECURITY_ATTRIBUTES * operator&();
};

WindowsSecurityAttributes::WindowsSecurityAttributes()
{
	m_winPSecurityDescriptor = (PSECURITY_DESCRIPTOR)calloc(1, SECURITY_DESCRIPTOR_MIN_LENGTH + 2 * sizeof(void**));
	assert(m_winPSecurityDescriptor != (PSECURITY_DESCRIPTOR)NULL);

	PSID *ppSID = (PSID *)((PBYTE)m_winPSecurityDescriptor + SECURITY_DESCRIPTOR_MIN_LENGTH);
	PACL *ppACL = (PACL *)((PBYTE)ppSID + sizeof(PSID *));

	InitializeSecurityDescriptor(m_winPSecurityDescriptor, SECURITY_DESCRIPTOR_REVISION);

	SID_IDENTIFIER_AUTHORITY sidIdentifierAuthority = SECURITY_WORLD_SID_AUTHORITY;
	AllocateAndInitializeSid(&sidIdentifierAuthority, 1, SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0, ppSID);

	EXPLICIT_ACCESS explicitAccess;
	ZeroMemory(&explicitAccess, sizeof(EXPLICIT_ACCESS));
	explicitAccess.grfAccessPermissions = STANDARD_RIGHTS_ALL | SPECIFIC_RIGHTS_ALL;
	explicitAccess.grfAccessMode = SET_ACCESS;
	explicitAccess.grfInheritance = INHERIT_ONLY;
	explicitAccess.Trustee.TrusteeForm = TRUSTEE_IS_SID;
	explicitAccess.Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
	explicitAccess.Trustee.ptstrName = (LPTSTR)*ppSID;

	SetEntriesInAcl(1, &explicitAccess, NULL, ppACL);

	SetSecurityDescriptorDacl(m_winPSecurityDescriptor, TRUE, *ppACL, FALSE);

	m_winSecurityAttributes.nLength = sizeof(m_winSecurityAttributes);
	m_winSecurityAttributes.lpSecurityDescriptor = m_winPSecurityDescriptor;
	m_winSecurityAttributes.bInheritHandle = TRUE;
}

WindowsSecurityAttributes::~WindowsSecurityAttributes()
{
	PSID* ppSID = (PSID*)((PBYTE)m_winPSecurityDescriptor + SECURITY_DESCRIPTOR_MIN_LENGTH);
	PACL* ppACL = (PACL*)((PBYTE)ppSID + sizeof(PSID*));

	if (*ppSID) {
		FreeSid(*ppSID);
	}
	if (*ppACL) {
		LocalFree(*ppACL);
	}
	free(m_winPSecurityDescriptor);
}

SECURITY_ATTRIBUTES *
WindowsSecurityAttributes::operator&()
{
	return &m_winSecurityAttributes;
}

DX12CudaInterop::DX12CudaInterop(UINT width, UINT height, std::string name) :
	DX12CudaSample(width, height, name),
	m_frameIndex(0),
	m_scissorRect(0, 0, static_cast<LONG>(width), static_cast<LONG>(height)),
	m_fenceValues{},
	m_rtvDescriptorSize(0)
{
	m_viewport = { 0.0f, 0.0f, static_cast<float>(width), static_cast<float>(height) };
	m_AnimTime = 1.0f;
}

void DX12CudaInterop::OnInit()
{
	LoadPipeline();
	InitCuda();
	LoadAssets();
}

// Load the rendering pipeline dependencies.
void DX12CudaInterop::LoadPipeline()
{
	UINT dxgiFactoryFlags = 0;

#if defined(_DEBUG)
	// Enable the debug layer (requires the Graphics Tools "optional feature").
	// NOTE: Enabling the debug layer after device creation will invalidate the active device.
	{
		ComPtr<ID3D12Debug> debugController;
		if (SUCCEEDED(D3D12GetDebugInterface(IID_PPV_ARGS(&debugController))))
		{
			debugController->EnableDebugLayer();

			// Enable additional debug layers.
			dxgiFactoryFlags |= DXGI_CREATE_FACTORY_DEBUG;
		}
	}
#endif

	ComPtr<IDXGIFactory4> factory;
	ThrowIfFailed(CreateDXGIFactory2(dxgiFactoryFlags, IID_PPV_ARGS(&factory)));

	if (m_useWarpDevice)
	{
		ComPtr<IDXGIAdapter> warpAdapter;
		ThrowIfFailed(factory->EnumWarpAdapter(IID_PPV_ARGS(&warpAdapter)));

		ThrowIfFailed(D3D12CreateDevice(
			warpAdapter.Get(),
			D3D_FEATURE_LEVEL_11_0,
			IID_PPV_ARGS(&m_device)
			));
	}
	else
	{
		ComPtr<IDXGIAdapter1> hardwareAdapter;
		GetHardwareAdapter(factory.Get(), &hardwareAdapter);

		ThrowIfFailed(D3D12CreateDevice(
			hardwareAdapter.Get(),
			D3D_FEATURE_LEVEL_11_0,
			IID_PPV_ARGS(&m_device)
			));
		DXGI_ADAPTER_DESC1 desc;
		hardwareAdapter->GetDesc1(&desc);
		m_dx12deviceluid = desc.AdapterLuid;
	}

	// Describe and create the command queue.
	D3D12_COMMAND_QUEUE_DESC queueDesc = {};
	queueDesc.Flags = D3D12_COMMAND_QUEUE_FLAG_NONE;
	queueDesc.Type = D3D12_COMMAND_LIST_TYPE_DIRECT;

	ThrowIfFailed(m_device->CreateCommandQueue(&queueDesc, IID_PPV_ARGS(&m_commandQueue)));

	// Describe and create the swap chain.
	DXGI_SWAP_CHAIN_DESC1 swapChainDesc = {};
	swapChainDesc.BufferCount = FrameCount;
	swapChainDesc.Width = m_width;
	swapChainDesc.Height = m_height;
	swapChainDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
	swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
	swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
	swapChainDesc.SampleDesc.Count = 1;

	ComPtr<IDXGISwapChain1> swapChain;
	ThrowIfFailed(factory->CreateSwapChainForHwnd(
		m_commandQueue.Get(),		// Swap chain needs the queue so that it can force a flush on it.
		Win32Application::GetHwnd(),
		&swapChainDesc,
		nullptr,
		nullptr,
		&swapChain
		));

	// This sample does not support fullscreen transitions.
	ThrowIfFailed(factory->MakeWindowAssociation(Win32Application::GetHwnd(), DXGI_MWA_NO_ALT_ENTER));

	ThrowIfFailed(swapChain.As(&m_swapChain));
	m_frameIndex = m_swapChain->GetCurrentBackBufferIndex();

	// Create descriptor heaps.
	{
		// Describe and create a render target view (RTV) descriptor heap.
		D3D12_DESCRIPTOR_HEAP_DESC rtvHeapDesc = {};
		rtvHeapDesc.NumDescriptors = FrameCount;
		rtvHeapDesc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_RTV;
		rtvHeapDesc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE;
		ThrowIfFailed(m_device->CreateDescriptorHeap(&rtvHeapDesc, IID_PPV_ARGS(&m_rtvHeap)));

		m_rtvDescriptorSize = m_device->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_RTV);
	}

	// Create frame resources.
	{
		CD3DX12_CPU_DESCRIPTOR_HANDLE rtvHandle(m_rtvHeap->GetCPUDescriptorHandleForHeapStart());

		// Create a RTV and a command allocator for each frame.
		for (UINT n = 0; n < FrameCount; n++)
		{
			ThrowIfFailed(m_swapChain->GetBuffer(n, IID_PPV_ARGS(&m_renderTargets[n])));
			m_device->CreateRenderTargetView(m_renderTargets[n].Get(), nullptr, rtvHandle);
			rtvHandle.Offset(1, m_rtvDescriptorSize);

			ThrowIfFailed(m_device->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, IID_PPV_ARGS(&m_commandAllocators[n])));
		}
	}
}

void DX12CudaInterop::InitCuda()
{
	int num_cuda_devices = 0;
	checkCudaErrors(cudaGetDeviceCount(&num_cuda_devices));

	if (!num_cuda_devices)
	{
		throw std::exception("No CUDA Devices found");
	}
	for (UINT devId = 0; devId < num_cuda_devices; devId++)
	{
		cudaDeviceProp devProp;
		checkCudaErrors(cudaGetDeviceProperties(&devProp, devId));

		if ((memcmp(&m_dx12deviceluid.LowPart, devProp.luid, sizeof(m_dx12deviceluid.LowPart)) == 0) && (memcmp(&m_dx12deviceluid.HighPart, devProp.luid + sizeof(m_dx12deviceluid.LowPart), sizeof(m_dx12deviceluid.HighPart)) == 0))
        {
			checkCudaErrors(cudaSetDevice(devId));
			m_cudaDeviceID = devId;
			m_nodeMask = devProp.luidDeviceNodeMask;
			checkCudaErrors(cudaStreamCreate(&m_streamToRun));
			printf("CUDA Device Used [%d] %s\n", devId, devProp.name);
			break;
		}
	}
}
// Load the sample assets.
void DX12CudaInterop::LoadAssets()
{
	// Create a root signature.
	{
		CD3DX12_DESCRIPTOR_RANGE range;
		CD3DX12_ROOT_PARAMETER parameter;

		range.Init(D3D12_DESCRIPTOR_RANGE_TYPE_CBV, 1, 0);
		parameter.InitAsDescriptorTable(1, &range, D3D12_SHADER_VISIBILITY_VERTEX);

		D3D12_ROOT_SIGNATURE_FLAGS rootSignatureFlags =
			D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT | // Only the input assembler stage needs access to the constant buffer.
			D3D12_ROOT_SIGNATURE_FLAG_DENY_DOMAIN_SHADER_ROOT_ACCESS |
			D3D12_ROOT_SIGNATURE_FLAG_DENY_GEOMETRY_SHADER_ROOT_ACCESS |
			D3D12_ROOT_SIGNATURE_FLAG_DENY_HULL_SHADER_ROOT_ACCESS |
			D3D12_ROOT_SIGNATURE_FLAG_DENY_PIXEL_SHADER_ROOT_ACCESS;

		CD3DX12_ROOT_SIGNATURE_DESC descRootSignature;
		descRootSignature.Init(1, &parameter, 0, nullptr, rootSignatureFlags);
		ComPtr<ID3DBlob> pSignature;
		ComPtr<ID3DBlob> pError;
		ThrowIfFailed(D3D12SerializeRootSignature(&descRootSignature, D3D_ROOT_SIGNATURE_VERSION_1, pSignature.GetAddressOf(), pError.GetAddressOf()));
		ThrowIfFailed(m_device->CreateRootSignature(0, pSignature->GetBufferPointer(), pSignature->GetBufferSize(), IID_PPV_ARGS(&m_rootSignature)));
	}
	// Create the pipeline state, which includes compiling and loading shaders.
	{
		ComPtr<ID3DBlob> vertexShader;
		ComPtr<ID3DBlob> pixelShader;

#if defined(_DEBUG)
		// Enable better shader debugging with the graphics debugging tools.
		UINT compileFlags = D3DCOMPILE_DEBUG | D3DCOMPILE_SKIP_OPTIMIZATION;
#else
		UINT compileFlags = 0;
#endif
		std::wstring filePath = GetAssetFullPath("shaders.hlsl");
		LPCWSTR result = filePath.c_str();
		ThrowIfFailed(D3DCompileFromFile(result, nullptr, nullptr, "VSMain", "vs_5_0", compileFlags, 0, &vertexShader, nullptr));
		ThrowIfFailed(D3DCompileFromFile(result, nullptr, nullptr, "PSMain", "ps_5_0", compileFlags, 0, &pixelShader, nullptr));

		// Define the vertex input layout.
		D3D12_INPUT_ELEMENT_DESC inputElementDescs[] =
		{
			{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA, 0 },
			{ "COLOR", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 12, D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA, 0 }
		};

		// Describe and create the graphics pipeline state object (PSO).
		D3D12_GRAPHICS_PIPELINE_STATE_DESC psoDesc = {};
		psoDesc.InputLayout = { inputElementDescs, _countof(inputElementDescs) };
		psoDesc.pRootSignature = m_rootSignature.Get();
		psoDesc.VS = CD3DX12_SHADER_BYTECODE(vertexShader.Get());
		psoDesc.PS = CD3DX12_SHADER_BYTECODE(pixelShader.Get());
		psoDesc.RasterizerState = CD3DX12_RASTERIZER_DESC(D3D12_DEFAULT);
		psoDesc.BlendState = CD3DX12_BLEND_DESC(D3D12_DEFAULT);
		psoDesc.DepthStencilState = CD3DX12_DEPTH_STENCIL_DESC(D3D12_DEFAULT);
		psoDesc.SampleMask = UINT_MAX;
		psoDesc.PrimitiveTopologyType = D3D12_PRIMITIVE_TOPOLOGY_TYPE_POINT;
		psoDesc.NumRenderTargets = 1;
		psoDesc.RTVFormats[0] = DXGI_FORMAT_R8G8B8A8_UNORM;
		psoDesc.SampleDesc.Count = 1;
		ThrowIfFailed(m_device->CreateGraphicsPipelineState(&psoDesc, IID_PPV_ARGS(&m_pipelineState)));
	}

	// Create the command list.
	ThrowIfFailed(m_device->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, m_commandAllocators[m_frameIndex].Get(), m_pipelineState.Get(), IID_PPV_ARGS(&m_commandList)));

	// Command lists are created in the recording state, but there is nothing
	// to record yet. The main loop expects it to be closed, so close it now.
	ThrowIfFailed(m_commandList->Close());

	// Create the vertex buffer.
	{
		// Define the geometry for a triangle.
		vertBufWidth = m_width/2;
		vertBufHeight = m_height/2;
		const UINT vertexBufferSize = sizeof(Vertex)*vertBufWidth*vertBufHeight;

		ThrowIfFailed(m_device->CreateCommittedResource(
			&CD3DX12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_DEFAULT),
			D3D12_HEAP_FLAG_SHARED,
			&CD3DX12_RESOURCE_DESC::Buffer(vertexBufferSize),
			D3D12_RESOURCE_STATE_VERTEX_AND_CONSTANT_BUFFER,
			nullptr,
			IID_PPV_ARGS(&m_vertexBuffer)));

		// Initialize the vertex buffer view.
		m_vertexBufferView.BufferLocation = m_vertexBuffer->GetGPUVirtualAddress();
		m_vertexBufferView.StrideInBytes = sizeof(Vertex);
		m_vertexBufferView.SizeInBytes = vertexBufferSize;

		HANDLE sharedHandle;
		WindowsSecurityAttributes windowsSecurityAttributes;
		LPCWSTR name = NULL;
		ThrowIfFailed(m_device->CreateSharedHandle(m_vertexBuffer.Get(), &windowsSecurityAttributes, GENERIC_ALL, name, &sharedHandle));

		D3D12_RESOURCE_ALLOCATION_INFO d3d12ResourceAllocationInfo;
		d3d12ResourceAllocationInfo = m_device->GetResourceAllocationInfo(m_nodeMask, 1, &CD3DX12_RESOURCE_DESC::Buffer(vertexBufferSize));
		size_t actualSize = d3d12ResourceAllocationInfo.SizeInBytes;
		size_t alignment  = d3d12ResourceAllocationInfo.Alignment;

		cudaExternalMemoryHandleDesc externalMemoryHandleDesc;
        memset(&externalMemoryHandleDesc, 0, sizeof(externalMemoryHandleDesc));

		externalMemoryHandleDesc.type = cudaExternalMemoryHandleTypeD3D12Resource;
		externalMemoryHandleDesc.handle.win32.handle = sharedHandle;
		externalMemoryHandleDesc.size = actualSize;
		externalMemoryHandleDesc.flags = cudaExternalMemoryDedicated;

		checkCudaErrors(cudaImportExternalMemory(&m_externalMemory, &externalMemoryHandleDesc));

		cudaExternalMemoryBufferDesc externalMemoryBufferDesc;
		memset(&externalMemoryBufferDesc, 0, sizeof(externalMemoryBufferDesc));
		externalMemoryBufferDesc.offset = 0;
		externalMemoryBufferDesc.size   = vertexBufferSize;
		externalMemoryBufferDesc.flags  = 0;

		checkCudaErrors(cudaExternalMemoryGetMappedBuffer(&m_cudaDevVertptr, m_externalMemory, &externalMemoryBufferDesc));
		RunSineWaveKernel(vertBufWidth, vertBufHeight, (Vertex *)m_cudaDevVertptr, m_streamToRun, 1.0f);
		checkCudaErrors(cudaStreamSynchronize(m_streamToRun));

	}

	// Create synchronization objects and wait until assets have been uploaded to the GPU.
	{
		ThrowIfFailed(m_device->CreateFence(m_fenceValues[m_frameIndex], D3D12_FENCE_FLAG_SHARED, IID_PPV_ARGS(&m_fence)));

		cudaExternalSemaphoreHandleDesc externalSemaphoreHandleDesc;

		memset(&externalSemaphoreHandleDesc, 0, sizeof(externalSemaphoreHandleDesc));
		WindowsSecurityAttributes windowsSecurityAttributes;
		LPCWSTR name = NULL;
		HANDLE sharedHandle;
		externalSemaphoreHandleDesc.type = cudaExternalSemaphoreHandleTypeD3D12Fence;
		m_device->CreateSharedHandle(m_fence.Get(), &windowsSecurityAttributes, GENERIC_ALL, name, &sharedHandle);
		externalSemaphoreHandleDesc.handle.win32.handle = (void *)sharedHandle;
		externalSemaphoreHandleDesc.flags = 0;

		checkCudaErrors(cudaImportExternalSemaphore(&m_externalSemaphore, &externalSemaphoreHandleDesc));

		m_fenceValues[m_frameIndex]++;

		// Create an event handle to use for frame synchronization.
		m_fenceEvent = CreateEvent(nullptr, FALSE, FALSE, nullptr);
		if (m_fenceEvent == nullptr)
		{
			ThrowIfFailed(HRESULT_FROM_WIN32(GetLastError()));
		}

		// Wait for the command list to execute; we are reusing the same command 
		// list in our main loop but for now, we just want to wait for setup to 
		// complete before continuing.
		WaitForGpu();
	}
}

// Render the scene.
void DX12CudaInterop::OnRender()
{
	// Record all the commands we need to render the scene into the command list.
	PopulateCommandList();

	// Execute the command list.
	ID3D12CommandList* ppCommandLists[] = { m_commandList.Get() };
	m_commandQueue->ExecuteCommandLists(_countof(ppCommandLists), ppCommandLists);

	// Present the frame.
	ThrowIfFailed(m_swapChain->Present(1, 0));

	// Schedule a Signal command in the queue.
	const UINT64 currentFenceValue = m_fenceValues[m_frameIndex];
	ThrowIfFailed(m_commandQueue->Signal(m_fence.Get(), currentFenceValue));

	MoveToNextFrame();
}

void DX12CudaInterop::OnDestroy()
{
	// Ensure that the GPU is no longer referencing resources that are about to be
	// cleaned up by the destructor.
	WaitForGpu();
	checkCudaErrors(cudaDestroyExternalSemaphore(m_externalSemaphore));
	checkCudaErrors(cudaDestroyExternalMemory(m_externalMemory));
	CloseHandle(m_fenceEvent);
}

void DX12CudaInterop::PopulateCommandList()
{
	// Command list allocators can only be reset when the associated 
	// command lists have finished execution on the GPU; apps should use 
	// fences to determine GPU execution progress.
	ThrowIfFailed(m_commandAllocators[m_frameIndex]->Reset());

	// However, when ExecuteCommandList() is called on a particular command 
	// list, that command list can then be reset at any time and must be before 
	// re-recording.
	ThrowIfFailed(m_commandList->Reset(m_commandAllocators[m_frameIndex].Get(), m_pipelineState.Get()));

	m_commandList->SetGraphicsRootSignature(m_rootSignature.Get());

	// Set necessary state.
	m_commandList->RSSetViewports(1, &m_viewport);
	m_commandList->RSSetScissorRects(1, &m_scissorRect);

	// Indicate that the back buffer will be used as a render target.
	m_commandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(m_renderTargets[m_frameIndex].Get(), D3D12_RESOURCE_STATE_PRESENT, D3D12_RESOURCE_STATE_RENDER_TARGET));

	CD3DX12_CPU_DESCRIPTOR_HANDLE rtvHandle(m_rtvHeap->GetCPUDescriptorHandleForHeapStart(), m_frameIndex, m_rtvDescriptorSize);
	m_commandList->OMSetRenderTargets(1, &rtvHandle, FALSE, nullptr);

	// Record commands.
	const float clearColor[] = { 0.0f, 0.2f, 0.4f, 1.0f };
	m_commandList->ClearRenderTargetView(rtvHandle, clearColor, 0, nullptr);
	m_commandList->IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_POINTLIST);
	m_commandList->IASetVertexBuffers(0, 1, &m_vertexBufferView);
	m_commandList->DrawInstanced(vertBufHeight*vertBufWidth, 1, 0, 0);

	// Indicate that the back buffer will now be used to present.
	m_commandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(m_renderTargets[m_frameIndex].Get(), D3D12_RESOURCE_STATE_RENDER_TARGET, D3D12_RESOURCE_STATE_PRESENT));

	ThrowIfFailed(m_commandList->Close());
}

// Wait for pending GPU work to complete.
void DX12CudaInterop::WaitForGpu()
{
	// Schedule a Signal command in the queue.
	ThrowIfFailed(m_commandQueue->Signal(m_fence.Get(), m_fenceValues[m_frameIndex]));

	// Wait until the fence has been processed.
	ThrowIfFailed(m_fence->SetEventOnCompletion(m_fenceValues[m_frameIndex], m_fenceEvent));
	WaitForSingleObjectEx(m_fenceEvent, INFINITE, FALSE);

	// Increment the fence value for the current frame.
	m_fenceValues[m_frameIndex]++;
}

// Prepare to render the next frame.
void DX12CudaInterop::MoveToNextFrame()
{
	const UINT64 currentFenceValue = m_fenceValues[m_frameIndex];
	cudaExternalSemaphoreWaitParams externalSemaphoreWaitParams;
	memset(&externalSemaphoreWaitParams, 0, sizeof(externalSemaphoreWaitParams));

	externalSemaphoreWaitParams.params.fence.value = currentFenceValue;
	externalSemaphoreWaitParams.flags = 0;

	checkCudaErrors(cudaWaitExternalSemaphoresAsync(&m_externalSemaphore, &externalSemaphoreWaitParams, 1, m_streamToRun));

	m_AnimTime += 0.01f;
	RunSineWaveKernel(vertBufWidth, vertBufHeight, (Vertex *)m_cudaDevVertptr, m_streamToRun, m_AnimTime);

	cudaExternalSemaphoreSignalParams externalSemaphoreSignalParams;
	memset(&externalSemaphoreSignalParams, 0, sizeof(externalSemaphoreSignalParams));
	m_fenceValues[m_frameIndex] = currentFenceValue + 1;
	externalSemaphoreSignalParams.params.fence.value = m_fenceValues[m_frameIndex];
	externalSemaphoreSignalParams.flags = 0;

	checkCudaErrors(cudaSignalExternalSemaphoresAsync(&m_externalSemaphore, &externalSemaphoreSignalParams, 1, m_streamToRun));

	// Update the frame index.
	m_frameIndex = m_swapChain->GetCurrentBackBufferIndex();

	// If the next frame is not ready to be rendered yet, wait until it is ready.
	if (m_fence->GetCompletedValue() < m_fenceValues[m_frameIndex])
	{
		ThrowIfFailed(m_fence->SetEventOnCompletion(m_fenceValues[m_frameIndex], m_fenceEvent));
		WaitForSingleObjectEx(m_fenceEvent, INFINITE, FALSE);
	}

	// Set the fence value for the next frame.
	m_fenceValues[m_frameIndex] = currentFenceValue + 2;
}