Purpose of the Sample:

This sample demonstrates serves as a DirectX 12 “Hello World” sample. It is based heavily on Frank Luna’s implementation from his book “3D Game Programming with DirectX 12”.
This sample contains the bare essentials to render content with DirectX 12. The sample simply renders a quad using a vertex and index buffer. The CPU and GPU are synchronized each frame and there is only ever one frame being processed by the CPU at a time. In a future article, I will demonstrate how to improve performance by keeping both the CPU and GPU busy by generating more frames on the CPU for the GPU to process. One interesting note about this sample is that I use bundles to execute the draw call.

“The purpose of bundles is to allow apps to group a small number of API commands together for later execution. At bundle creation time, the driver will perform as much pre-processing as is possible to make these cheap to execute later. Bundles are designed to be used and re-used any number of times.”
https://docs.microsoft.com/en-us/windows/desktop/direct3d12/recording-command-lists-and-bundles

NVidia suggests that you limit the number of commands you include in a bundle to increase its reusability.
https://developer.nvidia.com/dx12-dos-and-donts#worksubmit

CGame.h

#ifndef __CGAME__
#define __CGAME__

#include "d3d12.h"
#include "dxgi.h"
#include "dxgi1_4.h"
#include "d3dx12.h"
#include "UploadBuffer.h"
#include "DirectXMath.h"
#include "d3dcompiler.h"
#include "external\WRL\ComPTR.h"

using namespace DirectX;

struct ConstantBufferData
{
	XMMATRIX matrixWorld;
	XMMATRIX matrixView;
	XMMATRIX matrixProjection;
};

class CGame
{
	static const int SwapChainCount = 2;

	ComPtr<ID3D12Debug> m_D3D12DebugController;
	ComPtr<IDXGIFactory4> m_DXGIFactory;
	ComPtr<ID3D12Device> m_Dev;
	ComPtr<IDXGISwapChain> m_SwapChain;
	ComPtr<ID3D12Fence> m_Fence;

	ComPtr<ID3D12CommandQueue> m_CmdQueue;
	ComPtr<ID3D12CommandAllocator> m_CmdAllocator;
	ComPtr<ID3D12GraphicsCommandList> m_GfxCmdList;

    ComPtr<ID3D12CommandAllocator> m_CmdAllocatorDraw;
    ComPtr<ID3D12GraphicsCommandList> m_DrawCmdList;

	ComPtr<ID3D12DescriptorHeap> m_RtvHeap;
	ComPtr<ID3D12DescriptorHeap> m_DSHeap;
	ComPtr<ID3D12DescriptorHeap> m_CBVHeap;

	ComPtr<ID3D12Resource> m_SwapChainBuffer[SwapChainCount];
	ComPtr<ID3D12Resource> m_DepthStencilBuffer;

	ComPtr<ID3D12Resource> m_VertexBufferGPU = NULL;
	ComPtr<ID3D12Resource> m_VertexBufferUploader = NULL;

	ComPtr<ID3D12Resource> m_IndexBufferGPU = NULL;
	ComPtr<ID3D12Resource> m_IndexBufferUploader = NULL;

	UploadBuffer<ConstantBufferData>* m_ObjectCB;

	ComPtr<ID3D12RootSignature> m_RootSignature;

	ComPtr<ID3DBlob> m_VSByteCode;
	ComPtr<ID3DBlob> m_PSByteCode;
	D3D12_INPUT_ELEMENT_DESC m_InputLayout[2];

	ComPtr<ID3D12PipelineState> m_PipelineStateObject;

public:

	void Initialize(void * windowHandle, int width, int height);
	void Update();
	void Render();
    void Shutdown();

private:

	void EnableD3D12DebugMode();
	void CreateCommandObjects();
	void CreateSwapChain();
	void CreateRtvAndDSHeaps();
	void CreateBackbufferRtvAndDsv();

	void SetupViewportAndScissorRects();

	void FlushCommandQueue();

	void CreateConstantBuffer();
	void CreateRootSignature();
	void CreateShadersAndInputLayout();
	void CreateVertexBuffer();
	void CreateIndexBuffer();
	void CreatePSO();
    void CreateDrawCommandList();

	ID3D12Resource* CurrentBackBuffer() const;
	D3D12_CPU_DESCRIPTOR_HANDLE CurrentBackBufferView() const;
	D3D12_CPU_DESCRIPTOR_HANDLE DepthStencilView() const;

	void* m_WindowHandle;
	int m_Width;
	int m_Height;
	float m_AspectRatio;
	int m_CurrBackBuffer = 0;
	int m_RtvDescriptorSize;
	int m_DsvDescriptorSize;
	int m_CurrentFence;
};

#endif

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#ifndef __CGAME__

#define __CGAME__

#include "d3d12.h"

#include "dxgi.h"

#include "dxgi1_4.h"

#include "d3dx12.h"

#include "UploadBuffer.h"

#include "DirectXMath.h"

#include "d3dcompiler.h"

#include "external\WRL\ComPTR.h"

using namespace DirectX;

struct ConstantBufferData

{

XMMATRIX matrixWorld;

XMMATRIX matrixView;

XMMATRIX matrixProjection;

};

class CGame

{

static const int SwapChainCount = 2;

ComPtr<ID3D12Debug> m_D3D12DebugController;

ComPtr<IDXGIFactory4> m_DXGIFactory;

ComPtr<ID3D12Device> m_Dev;

ComPtr<IDXGISwapChain> m_SwapChain;

ComPtr<ID3D12Fence> m_Fence;

ComPtr<ID3D12CommandQueue> m_CmdQueue;

ComPtr<ID3D12CommandAllocator> m_CmdAllocator;

ComPtr<ID3D12GraphicsCommandList> m_GfxCmdList;

ComPtr<ID3D12CommandAllocator> m_CmdAllocatorDraw;

ComPtr<ID3D12GraphicsCommandList> m_DrawCmdList;

ComPtr<ID3D12DescriptorHeap> m_RtvHeap;

ComPtr<ID3D12DescriptorHeap> m_DSHeap;

ComPtr<ID3D12DescriptorHeap> m_CBVHeap;

ComPtr<ID3D12Resource> m_SwapChainBuffer[SwapChainCount];

ComPtr<ID3D12Resource> m_DepthStencilBuffer;

ComPtr<ID3D12Resource> m_VertexBufferGPU = NULL;

ComPtr<ID3D12Resource> m_VertexBufferUploader = NULL;

ComPtr<ID3D12Resource> m_IndexBufferGPU = NULL;

ComPtr<ID3D12Resource> m_IndexBufferUploader = NULL;

UploadBuffer<ConstantBufferData>* m_ObjectCB;

ComPtr<ID3D12RootSignature> m_RootSignature;

ComPtr<ID3DBlob> m_VSByteCode;

ComPtr<ID3DBlob> m_PSByteCode;

D3D12_INPUT_ELEMENT_DESC m_InputLayout[2];

ComPtr<ID3D12PipelineState> m_PipelineStateObject;

public:

void Initialize(void * windowHandle, int width, int height);

void Update();

void Render();

void Shutdown();

private:

void EnableD3D12DebugMode();

void CreateCommandObjects();

void CreateSwapChain();

void CreateRtvAndDSHeaps();

void CreateBackbufferRtvAndDsv();

void SetupViewportAndScissorRects();

void FlushCommandQueue();

void CreateConstantBuffer();

void CreateRootSignature();

void CreateShadersAndInputLayout();

void CreateVertexBuffer();

void CreateIndexBuffer();

void CreatePSO();

void CreateDrawCommandList();

ID3D12Resource* CurrentBackBuffer() const;

D3D12_CPU_DESCRIPTOR_HANDLE CurrentBackBufferView() const;

D3D12_CPU_DESCRIPTOR_HANDLE DepthStencilView() const;

void* m_WindowHandle;

int m_Width;

int m_Height;

float m_AspectRatio;

int m_CurrBackBuffer = 0;

int m_RtvDescriptorSize;

int m_DsvDescriptorSize;

int m_CurrentFence;

};

#endif

CGame.cpp

#include "CGame.h"
#include <fstream>

using namespace std;

struct Vertex
{
	float x, y, z, r, g, b, u, v;
};

struct Vector
{
	float x, y, z;
};

ID3D12Resource* CreateDefaultBuffer(ID3D12Device* dev, ID3D12GraphicsCommandList* cmdLst, const void* initData, UINT64 byteSize, ID3D12Resource* uploadBuffer)
{
	ID3D12Resource* defaultBuffer;

	dev->CreateCommittedResource(
		&CD3DX12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_DEFAULT),
		D3D12_HEAP_FLAG_NONE,
		&CD3DX12_RESOURCE_DESC::Buffer(byteSize),
		D3D12_RESOURCE_STATE_COMMON,
		NULL,
		__uuidof(ID3D12Resource),
		reinterpret_cast<void**>(&defaultBuffer)
	);

	dev->CreateCommittedResource(
		&CD3DX12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_UPLOAD),
		D3D12_HEAP_FLAG_NONE,
		&CD3DX12_RESOURCE_DESC::Buffer(byteSize),
		D3D12_RESOURCE_STATE_GENERIC_READ,
		NULL,
		__uuidof(ID3D12Resource),
		reinterpret_cast<void**>(&uploadBuffer)
	);

	D3D12_SUBRESOURCE_DATA data = {};
	data.pData = initData;
	data.RowPitch = byteSize;
	data.SlicePitch = data.RowPitch;

	cmdLst->ResourceBarrier(
		1,
		&CD3DX12_RESOURCE_BARRIER::Transition(defaultBuffer, D3D12_RESOURCE_STATE_COMMON, D3D12_RESOURCE_STATE_COPY_DEST)
	);

	UpdateSubresources<1>(cmdLst, defaultBuffer, uploadBuffer, 0, 0, 1, &data);

	cmdLst->ResourceBarrier(
		1,
		&CD3DX12_RESOURCE_BARRIER::Transition(defaultBuffer, D3D12_RESOURCE_STATE_COPY_DEST, D3D12_RESOURCE_STATE_GENERIC_READ)
	);

	return defaultBuffer;
}

void LoadShader(std::string filename, unsigned char*& outShaderSrc, unsigned int& outFileLength)
{
	outShaderSrc = 0;
	outFileLength = 0;

	std::ifstream file(filename, std::ios::in | std::ios::binary | std::ios::ate);

	if (file.is_open())
	{
		outFileLength = (int)file.tellg();
		outShaderSrc = new unsigned char[outFileLength];

		file.seekg(0, std::ios::beg);
		file.read(reinterpret_cast<char*>(outShaderSrc), outFileLength);
		file.close();
	}
}

void CGame::EnableD3D12DebugMode()
{
	HRESULT hr =  D3D12GetDebugInterface(__uuidof(ID3D12Debug), reinterpret_cast<void**>(&m_D3D12DebugController));
	m_D3D12DebugController->EnableDebugLayer();

}

void CGame::CreateCommandObjects()
{
	HRESULT hr = S_OK;

	D3D12_COMMAND_QUEUE_DESC queueDesc = {};

	queueDesc.Type = D3D12_COMMAND_LIST_TYPE_DIRECT;
	queueDesc.Flags = D3D12_COMMAND_QUEUE_FLAG_NONE;
	hr = m_Dev->CreateCommandQueue(&queueDesc, __uuidof(ID3D12CommandQueue), reinterpret_cast<void**>(&m_CmdQueue));
	hr = m_Dev->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, __uuidof(ID3D12CommandAllocator), reinterpret_cast<void**>(m_CmdAllocator.GetAddressOf()));
	hr = m_Dev->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, m_CmdAllocator.Get(), NULL, __uuidof(ID3D12CommandList), reinterpret_cast<void**>(m_GfxCmdList.GetAddressOf()));

	m_GfxCmdList->Close();
}

void CGame::CreateDrawCommandList()
{
    HRESULT hr = S_OK;

    m_Dev->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_BUNDLE, __uuidof(ID3D12CommandAllocator), reinterpret_cast<void**>(m_CmdAllocatorDraw.GetAddressOf()));
    m_Dev->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_BUNDLE, m_CmdAllocatorDraw.Get(), m_PipelineStateObject.Get(), __uuidof(ID3D12CommandList), reinterpret_cast<void**>(m_DrawCmdList.GetAddressOf()));

    m_DrawCmdList->SetGraphicsRootSignature(m_RootSignature.Get());

    D3D12_VERTEX_BUFFER_VIEW vbView;
    vbView.BufferLocation = m_VertexBufferGPU->GetGPUVirtualAddress();
    vbView.SizeInBytes = 6 * sizeof(Vertex);
    vbView.StrideInBytes = sizeof(Vertex);

    m_DrawCmdList->IASetVertexBuffers(0, 1, &vbView);

    D3D12_INDEX_BUFFER_VIEW ibView;
    ibView.BufferLocation = m_IndexBufferGPU->GetGPUVirtualAddress();
    ibView.SizeInBytes = 6 * sizeof(int);
    ibView.Format = DXGI_FORMAT_R32_UINT;

    m_DrawCmdList->IASetIndexBuffer(&ibView);
    m_DrawCmdList->IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST);

    m_DrawCmdList->DrawIndexedInstanced(6, 1, 0, 0, 0);

    m_DrawCmdList->Close();
}

void CGame::CreateSwapChain()
{
	DXGI_SWAP_CHAIN_DESC sd = { 0 };
	sd.BufferDesc.Width = m_Width;
	sd.BufferDesc.Height = m_Height;
	sd.BufferDesc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;

	sd.SampleDesc.Count = 1;

	sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
	sd.BufferCount = SwapChainCount;
	sd.OutputWindow = (HWND)m_WindowHandle;
	sd.Windowed = true;
	sd.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
	sd.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;

	HRESULT hr = m_DXGIFactory->CreateSwapChain(m_CmdQueue.Get(), &sd, m_SwapChain.GetAddressOf());

	m_CurrBackBuffer = 0;
}

void CGame::CreateRtvAndDSHeaps()
{
	HRESULT hr = S_OK;

	D3D12_DESCRIPTOR_HEAP_DESC rtvHeapDesc;
	rtvHeapDesc.NumDescriptors = SwapChainCount;
	rtvHeapDesc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_RTV;
	rtvHeapDesc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE;
	rtvHeapDesc.NodeMask = 0;
	hr = m_Dev->CreateDescriptorHeap(&rtvHeapDesc, __uuidof(ID3D12DescriptorHeap), reinterpret_cast<void**>(&m_RtvHeap));

	D3D12_DESCRIPTOR_HEAP_DESC dsvHeapDesc;
	dsvHeapDesc.NumDescriptors = 1;
	dsvHeapDesc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_DSV;
	dsvHeapDesc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE;
	dsvHeapDesc.NodeMask = 0;
	hr = m_Dev->CreateDescriptorHeap(&dsvHeapDesc, __uuidof(ID3D12DescriptorHeap), reinterpret_cast<void**>(&m_DSHeap));

	m_RtvDescriptorSize = m_Dev->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_RTV);
	m_DsvDescriptorSize = m_Dev->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_DSV);
}

void CGame::CreateBackbufferRtvAndDsv()
{
	FlushCommandQueue();
	m_GfxCmdList->Reset(m_CmdAllocator.Get(), NULL);


	m_SwapChain->ResizeBuffers(
		SwapChainCount,
		m_Width, m_Height,
		DXGI_FORMAT_B8G8R8A8_UNORM,
		DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH);

	m_CurrBackBuffer = 0;

	CD3DX12_CPU_DESCRIPTOR_HANDLE rtvHeapHandle(m_RtvHeap->GetCPUDescriptorHandleForHeapStart());
	for (int i = 0; i < SwapChainCount; ++i)
	{
		m_SwapChain->GetBuffer(i, __uuidof(ID3D12Resource), reinterpret_cast<void**>(&m_SwapChainBuffer[i]));
		m_Dev->CreateRenderTargetView(m_SwapChainBuffer[i].Get(), NULL, rtvHeapHandle);
		rtvHeapHandle.Offset(1, m_RtvDescriptorSize);
	}

	D3D12_RESOURCE_DESC depthStencilDesc = { 0 };
	depthStencilDesc.Dimension = D3D12_RESOURCE_DIMENSION_TEXTURE2D;
	depthStencilDesc.Width = m_Width;
	depthStencilDesc.Height = m_Height;
	depthStencilDesc.DepthOrArraySize = 1;
	depthStencilDesc.MipLevels = 1;
	depthStencilDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
	depthStencilDesc.SampleDesc.Count = 1;
	depthStencilDesc.SampleDesc.Quality = 0;
	depthStencilDesc.Flags = D3D12_RESOURCE_FLAG_ALLOW_DEPTH_STENCIL;

	D3D12_CLEAR_VALUE optClear;
	optClear.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
	optClear.DepthStencil.Depth = 1.0f;
	optClear.DepthStencil.Stencil = 0;

	HRESULT hr = S_OK;
	hr = m_Dev->CreateCommittedResource(&CD3DX12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_DEFAULT), D3D12_HEAP_FLAG_NONE, &depthStencilDesc, D3D12_RESOURCE_STATE_COMMON, &optClear, __uuidof(ID3D12Resource), reinterpret_cast<void**>(&m_DepthStencilBuffer));
	m_Dev->CreateDepthStencilView(m_DepthStencilBuffer.Get(), NULL, DepthStencilView());
	m_GfxCmdList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(m_DepthStencilBuffer.Get(), D3D12_RESOURCE_STATE_COMMON, D3D12_RESOURCE_STATE_DEPTH_WRITE));

	hr = m_GfxCmdList->Close();
	ID3D12CommandList* cmdLists[1] = { m_GfxCmdList.Get() };
	m_CmdQueue->ExecuteCommandLists(1, cmdLists);

	FlushCommandQueue();
}

void CGame::SetupViewportAndScissorRects()
{
	D3D12_VIEWPORT vp;
	vp.TopLeftX = 0.0f;
	vp.TopLeftY = 0.0f;
	vp.Width = static_cast<float>(m_Width);
	vp.Height = static_cast<float>(m_Height);
	vp.MinDepth = 0.0f;
	vp.MaxDepth = 1.0f;
	m_GfxCmdList->RSSetViewports(1, &vp);

	D3D12_RECT scissorRect = { 0,0, m_Width, m_Height };
	m_GfxCmdList->RSSetScissorRects(1, &scissorRect);
}

ID3D12Resource* CGame::CurrentBackBuffer() const
{
	return m_SwapChainBuffer[m_CurrBackBuffer].Get();
}

D3D12_CPU_DESCRIPTOR_HANDLE CGame::CurrentBackBufferView() const
{
	return CD3DX12_CPU_DESCRIPTOR_HANDLE(
		m_RtvHeap->GetCPUDescriptorHandleForHeapStart(),
		m_CurrBackBuffer,
		m_RtvDescriptorSize);
}

D3D12_CPU_DESCRIPTOR_HANDLE CGame::DepthStencilView() const
{
	return m_DSHeap->GetCPUDescriptorHandleForHeapStart();
}

void CGame::FlushCommandQueue()
{
	// Advance the fence value to mark commands up to this fence point.
	m_CurrentFence++;

	// Add an instruction to the command queue to set a new fence point.  Because we 
	// are on the GPU timeline, the new fence point won't be set until the GPU finishes
	// processing all the commands prior to this Signal().
	m_CmdQueue->Signal(m_Fence.Get(), m_CurrentFence);

	// Wait until the GPU has completed commands up to this fence point.
	if (m_Fence->GetCompletedValue() < m_CurrentFence)
	{
		HANDLE eventHandle = CreateEventEx(nullptr, false, false, EVENT_ALL_ACCESS);

		// Fire event when GPU hits current fence.  
		m_Fence->SetEventOnCompletion(m_CurrentFence, eventHandle);

		// Wait until the GPU hits current fence event is fired.
		WaitForSingleObject(eventHandle, INFINITE);
		CloseHandle(eventHandle);
	}
}

void CGame::CreateConstantBuffer()
{
	HRESULT hr = S_OK;

	D3D12_DESCRIPTOR_HEAP_DESC heapDesc;
	heapDesc.NumDescriptors = 1;
	heapDesc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV;
	heapDesc.NodeMask = 0;
	heapDesc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_SHADER_VISIBLE;

	hr = m_Dev->CreateDescriptorHeap(&heapDesc, __uuidof(ID3D12DescriptorHeap), reinterpret_cast<void**>(&m_CBVHeap));

	m_ObjectCB = new UploadBuffer<ConstantBufferData>(m_Dev.Get(), 1, true);
	UINT objCBByteSize = CalcConstantBufferByteSize(sizeof(ConstantBufferData));

	D3D12_GPU_VIRTUAL_ADDRESS cbAddress = m_ObjectCB->Resource()->GetGPUVirtualAddress();

	D3D12_CONSTANT_BUFFER_VIEW_DESC cbDesc;
	cbDesc.BufferLocation = cbAddress;
	cbDesc.SizeInBytes = objCBByteSize;

	m_Dev->CreateConstantBufferView(&cbDesc, m_CBVHeap->GetCPUDescriptorHandleForHeapStart());
}

void CGame::CreateRootSignature()
{
	HRESULT hr = S_OK;
	CD3DX12_ROOT_PARAMETER slotRootParameter[1];

	CD3DX12_DESCRIPTOR_RANGE cbvTable;
	cbvTable.Init(D3D12_DESCRIPTOR_RANGE_TYPE_CBV, 1, 0);
	slotRootParameter[0].InitAsDescriptorTable(1, &cbvTable);

	CD3DX12_ROOT_SIGNATURE_DESC rsDesc(1, slotRootParameter, 0, NULL, D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT);
	ID3DBlob* serializedRootSigBlob = NULL;
	ID3DBlob* errorBlob = NULL;

	hr = D3D12SerializeRootSignature(&rsDesc, D3D_ROOT_SIGNATURE_VERSION_1, &serializedRootSigBlob, &errorBlob);

	hr = m_Dev->CreateRootSignature(0, serializedRootSigBlob->GetBufferPointer(), serializedRootSigBlob->GetBufferSize(), __uuidof(ID3D12RootSignature), reinterpret_cast<void**>(&m_RootSignature));
}

void CGame::CreateShadersAndInputLayout()
{
	HRESULT hr = S_OK;

	hr = D3DCompileFromFile(L"Assets/VertexShader.hlsl", NULL, NULL, "main", "vs_5_0", 0, 0, m_VSByteCode.GetAddressOf(), NULL);
	hr = D3DCompileFromFile(L"Assets/PixelShader.hlsl", NULL, NULL, "main", "ps_5_0", 0, 0, m_PSByteCode.GetAddressOf(), NULL);


	m_InputLayout[0] = D3D12_INPUT_ELEMENT_DESC(
		{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA, 0 }
	);

	m_InputLayout[1] = D3D12_INPUT_ELEMENT_DESC(
		{ "COLOR", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, D3D12_APPEND_ALIGNED_ELEMENT, D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA, 0 }
	);
}

void CGame::CreateVertexBuffer()
{
	m_GfxCmdList->Reset(m_CmdAllocator.Get(), NULL);

	Vertex triangle[] =
	{
		{ -0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f },
		{ 0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f },
		{ -0.5f, -0.5f, 0.0f, 0.0f, 0.0f, 1.0f },

		{ -0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f },
		{ 0.5f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f },
		{ 0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f },
	};

	m_VertexBufferGPU = CreateDefaultBuffer(m_Dev.Get(), m_GfxCmdList.Get(), triangle, 6 * sizeof(Vertex), m_VertexBufferUploader.Get());

	HRESULT hr = m_GfxCmdList->Close();
	ID3D12CommandList* cmdLists[1] = { m_GfxCmdList.Get() };
	m_CmdQueue->ExecuteCommandLists(1, cmdLists);

	FlushCommandQueue();
}

void CGame::CreateIndexBuffer()
{
	m_GfxCmdList->Reset(m_CmdAllocator.Get(), NULL);

	int indices[] = { 0, 1, 2, 0, 4, 1 };

	m_IndexBufferGPU = CreateDefaultBuffer(m_Dev.Get(), m_GfxCmdList.Get(), indices, sizeof(int) * 6, m_IndexBufferUploader.Get());

	HRESULT hr = m_GfxCmdList->Close();
	ID3D12CommandList* cmdLists[1] = { m_GfxCmdList.Get() };
	m_CmdQueue->ExecuteCommandLists(1, cmdLists);

	FlushCommandQueue();
}

void CGame::CreatePSO()
{
	HRESULT hr = S_OK;

	D3D12_GRAPHICS_PIPELINE_STATE_DESC desc;
	ZeroMemory(&desc, sizeof(D3D12_GRAPHICS_PIPELINE_STATE_DESC));

	desc.InputLayout = { m_InputLayout, 2 };
	desc.pRootSignature = m_RootSignature.Get();
	desc.VS = {
		reinterpret_cast<BYTE*>(m_VSByteCode->GetBufferPointer()),
		m_VSByteCode->GetBufferSize()
	};

	desc.PS = {
		reinterpret_cast<BYTE*>(m_PSByteCode->GetBufferPointer()),
		m_PSByteCode->GetBufferSize()
	};

	desc.RasterizerState = CD3DX12_RASTERIZER_DESC(D3D12_DEFAULT);
	desc.BlendState = CD3DX12_BLEND_DESC(D3D12_DEFAULT);
	desc.DepthStencilState = CD3DX12_DEPTH_STENCIL_DESC(D3D12_DEFAULT);
	desc.SampleMask = UINT_MAX;
	desc.PrimitiveTopologyType = D3D12_PRIMITIVE_TOPOLOGY_TYPE_TRIANGLE;
	desc.NumRenderTargets = 1;
	desc.RTVFormats[0] = DXGI_FORMAT_B8G8R8A8_UNORM;
	desc.SampleDesc.Count = 1;
	desc.SampleDesc.Quality = 0;
	desc.DSVFormat = DXGI_FORMAT_D24_UNORM_S8_UINT;

	hr = m_Dev->CreateGraphicsPipelineState(&desc, __uuidof(ID3D12PipelineState), reinterpret_cast<void**>(&m_PipelineStateObject));

}

void CGame::Initialize(void * windowHandle, int width, int height)
{
	m_WindowHandle = static_cast<int*>(windowHandle);
	m_Width = width;
	m_Height = height;
	m_AspectRatio = (float)width / (float)height;

	HRESULT hr = S_OK;

	EnableD3D12DebugMode();

	hr = CreateDXGIFactory1(__uuidof(IDXGIFactory4), reinterpret_cast<void**>(&m_DXGIFactory));
	hr = D3D12CreateDevice(NULL, D3D_FEATURE_LEVEL_12_1, __uuidof(ID3D12Device), reinterpret_cast<void**>(&m_Dev));

	m_CurrentFence = 0;
	hr = m_Dev->CreateFence(0, D3D12_FENCE_FLAG_NONE, __uuidof(ID3D12Fence), reinterpret_cast<void**>(&m_Fence));

	CreateCommandObjects();
	CreateSwapChain();
	CreateRtvAndDSHeaps();
	CreateBackbufferRtvAndDsv();

	CreateConstantBuffer();
	CreateRootSignature();
	CreateShadersAndInputLayout();
	CreateVertexBuffer();
	CreateIndexBuffer();
	CreatePSO();
    CreateDrawCommandList();
}

void CGame::Shutdown()
{
    FlushCommandQueue();
}

void CGame::Update()
{
	XMMATRIX matWorld = XMMatrixRotationY(3.14159f);
	XMVECTOR vecCamPos = XMVectorSet(0.0f, 0.0f, 1.5f, 0);
	XMVECTOR vecCamLookAt = XMVectorSet(0, 0, 0, 0);
	XMVECTOR vecCamUp = XMVectorSet(0, 1, 0, 0);
	XMMATRIX matView = XMMatrixLookAtLH(vecCamPos, vecCamLookAt, vecCamUp);

	XMMATRIX matProjection = XMMatrixPerspectiveFovLH(
		XMConvertToRadians(45),
		m_AspectRatio,
		1,
		100);

	XMMATRIX matMVP = matWorld * matView * matProjection;

	ConstantBufferData constantBufferData;
	constantBufferData.matrixWorld = matWorld;
	constantBufferData.matrixView = matView;
	constantBufferData.matrixProjection = matProjection;

	m_ObjectCB->CopyData(0, constantBufferData);
}

void CGame::Render()
{
	HRESULT hr = S_OK;

	hr = m_CmdAllocator->Reset();
	hr = m_GfxCmdList->Reset(m_CmdAllocator.Get(), m_PipelineStateObject.Get());

	m_GfxCmdList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(CurrentBackBuffer(),
		D3D12_RESOURCE_STATE_PRESENT, D3D12_RESOURCE_STATE_RENDER_TARGET));

	SetupViewportAndScissorRects();

	float color[4] = { 0.0f, 0.0f, 0.0f, 1.0f };
	m_GfxCmdList->ClearRenderTargetView(CurrentBackBufferView(), color, 0, NULL);
	m_GfxCmdList->ClearDepthStencilView(DepthStencilView(), D3D12_CLEAR_FLAG_DEPTH | D3D12_CLEAR_FLAG_STENCIL, 1.0f, 0, 0, NULL);
	m_GfxCmdList->OMSetRenderTargets(1, &CurrentBackBufferView(), true, &DepthStencilView());

    m_GfxCmdList->SetGraphicsRootSignature(m_RootSignature.Get());

    ID3D12DescriptorHeap* descHeaps = { m_CBVHeap.Get() };
    m_GfxCmdList->SetDescriptorHeaps(1, &descHeaps);
    m_GfxCmdList->SetGraphicsRootDescriptorTable(0, m_CBVHeap->GetGPUDescriptorHandleForHeapStart());

    m_GfxCmdList->ExecuteBundle(m_DrawCmdList.Get());

	m_GfxCmdList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(CurrentBackBuffer(),
		D3D12_RESOURCE_STATE_RENDER_TARGET, D3D12_RESOURCE_STATE_PRESENT));

	m_GfxCmdList->Close();

	ID3D12CommandList* cmdLsts[] = { m_GfxCmdList.Get() };
	m_CmdQueue->ExecuteCommandLists(1, cmdLsts);

	m_SwapChain->Present(0, 0);
	m_CurrBackBuffer = (m_CurrBackBuffer + 1) % SwapChainCount;

	FlushCommandQueue();
}

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#include "CGame.h"

#include <fstream>

using namespace std;

struct Vertex

{

float x, y, z, r, g, b, u, v;

};

struct Vector

{

float x, y, z;

};

ID3D12Resource* CreateDefaultBuffer(ID3D12Device* dev, ID3D12GraphicsCommandList* cmdLst, const void* initData, UINT64 byteSize, ID3D12Resource* uploadBuffer)

{

ID3D12Resource* defaultBuffer;

dev->CreateCommittedResource(

&CD3DX12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_DEFAULT),

D3D12_HEAP_FLAG_NONE,

&CD3DX12_RESOURCE_DESC::Buffer(byteSize),

D3D12_RESOURCE_STATE_COMMON,

NULL,

__uuidof(ID3D12Resource),

reinterpret_cast<void**>(&defaultBuffer)

);

dev->CreateCommittedResource(

&CD3DX12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_UPLOAD),

D3D12_HEAP_FLAG_NONE,

&CD3DX12_RESOURCE_DESC::Buffer(byteSize),

D3D12_RESOURCE_STATE_GENERIC_READ,

NULL,

__uuidof(ID3D12Resource),

reinterpret_cast<void**>(&uploadBuffer)

);

D3D12_SUBRESOURCE_DATA data = {};

data.pData = initData;

data.RowPitch = byteSize;

data.SlicePitch = data.RowPitch;

cmdLst->ResourceBarrier(

&CD3DX12_RESOURCE_BARRIER::Transition(defaultBuffer, D3D12_RESOURCE_STATE_COMMON, D3D12_RESOURCE_STATE_COPY_DEST)

);

UpdateSubresources<1>(cmdLst, defaultBuffer, uploadBuffer, 0, 0, 1, &data);

cmdLst->ResourceBarrier(

&CD3DX12_RESOURCE_BARRIER::Transition(defaultBuffer, D3D12_RESOURCE_STATE_COPY_DEST, D3D12_RESOURCE_STATE_GENERIC_READ)

);

return defaultBuffer;

}

void LoadShader(std::string filename, unsigned char*& outShaderSrc, unsigned int& outFileLength)

{

outShaderSrc = 0;

outFileLength = 0;

std::ifstream file(filename, std::ios::in | std::ios::binary | std::ios::ate);

if (file.is_open())

{

outFileLength = (int)file.tellg();

outShaderSrc = new unsigned char[outFileLength];

file.seekg(0, std::ios::beg);

file.read(reinterpret_cast<char*>(outShaderSrc), outFileLength);

file.close();

}

void CGame::EnableD3D12DebugMode()

{

HRESULT hr = D3D12GetDebugInterface(__uuidof(ID3D12Debug), reinterpret_cast<void**>(&m_D3D12DebugController));

m_D3D12DebugController->EnableDebugLayer();

}

void CGame::CreateCommandObjects()

{

HRESULT hr = S_OK;

D3D12_COMMAND_QUEUE_DESC queueDesc = {};

queueDesc.Type = D3D12_COMMAND_LIST_TYPE_DIRECT;

queueDesc.Flags = D3D12_COMMAND_QUEUE_FLAG_NONE;

hr = m_Dev->CreateCommandQueue(&queueDesc, __uuidof(ID3D12CommandQueue), reinterpret_cast<void**>(&m_CmdQueue));

hr = m_Dev->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, __uuidof(ID3D12CommandAllocator), reinterpret_cast<void**>(m_CmdAllocator.GetAddressOf()));

hr = m_Dev->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, m_CmdAllocator.Get(), NULL, __uuidof(ID3D12CommandList), reinterpret_cast<void**>(m_GfxCmdList.GetAddressOf()));

m_GfxCmdList->Close();

}

void CGame::CreateDrawCommandList()

{

HRESULT hr = S_OK;

m_Dev->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_BUNDLE, __uuidof(ID3D12CommandAllocator), reinterpret_cast<void**>(m_CmdAllocatorDraw.GetAddressOf()));

m_Dev->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_BUNDLE, m_CmdAllocatorDraw.Get(), m_PipelineStateObject.Get(), __uuidof(ID3D12CommandList), reinterpret_cast<void**>(m_DrawCmdList.GetAddressOf()));

m_DrawCmdList->SetGraphicsRootSignature(m_RootSignature.Get());

D3D12_VERTEX_BUFFER_VIEW vbView;

vbView.BufferLocation = m_VertexBufferGPU->GetGPUVirtualAddress();

vbView.SizeInBytes = 6 * sizeof(Vertex);

vbView.StrideInBytes = sizeof(Vertex);

m_DrawCmdList->IASetVertexBuffers(0, 1, &vbView);

D3D12_INDEX_BUFFER_VIEW ibView;

ibView.BufferLocation = m_IndexBufferGPU->GetGPUVirtualAddress();

ibView.SizeInBytes = 6 * sizeof(int);

ibView.Format = DXGI_FORMAT_R32_UINT;

m_DrawCmdList->IASetIndexBuffer(&ibView);

m_DrawCmdList->IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST);

m_DrawCmdList->DrawIndexedInstanced(6, 1, 0, 0, 0);

m_DrawCmdList->Close();

}

void CGame::CreateSwapChain()

{

DXGI_SWAP_CHAIN_DESC sd = { 0 };

sd.BufferDesc.Width = m_Width;

sd.BufferDesc.Height = m_Height;

sd.BufferDesc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;

sd.SampleDesc.Count = 1;

sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;

sd.BufferCount = SwapChainCount;

sd.OutputWindow = (HWND)m_WindowHandle;

sd.Windowed = true;

sd.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;

sd.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;

HRESULT hr = m_DXGIFactory->CreateSwapChain(m_CmdQueue.Get(), &sd, m_SwapChain.GetAddressOf());

m_CurrBackBuffer = 0;

}

void CGame::CreateRtvAndDSHeaps()

{

HRESULT hr = S_OK;

D3D12_DESCRIPTOR_HEAP_DESC rtvHeapDesc;

rtvHeapDesc.NumDescriptors = SwapChainCount;

rtvHeapDesc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_RTV;

rtvHeapDesc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE;

rtvHeapDesc.NodeMask = 0;

hr = m_Dev->CreateDescriptorHeap(&rtvHeapDesc, __uuidof(ID3D12DescriptorHeap), reinterpret_cast<void**>(&m_RtvHeap));

D3D12_DESCRIPTOR_HEAP_DESC dsvHeapDesc;

dsvHeapDesc.NumDescriptors = 1;

dsvHeapDesc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_DSV;

dsvHeapDesc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE;

dsvHeapDesc.NodeMask = 0;

hr = m_Dev->CreateDescriptorHeap(&dsvHeapDesc, __uuidof(ID3D12DescriptorHeap), reinterpret_cast<void**>(&m_DSHeap));

m_RtvDescriptorSize = m_Dev->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_RTV);

m_DsvDescriptorSize = m_Dev->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_DSV);

}

void CGame::CreateBackbufferRtvAndDsv()

{

FlushCommandQueue();

m_GfxCmdList->Reset(m_CmdAllocator.Get(), NULL);

m_SwapChain->ResizeBuffers(

SwapChainCount,

m_Width, m_Height,

DXGI_FORMAT_B8G8R8A8_UNORM,

DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH);

m_CurrBackBuffer = 0;

CD3DX12_CPU_DESCRIPTOR_HANDLE rtvHeapHandle(m_RtvHeap->GetCPUDescriptorHandleForHeapStart());

for (int i = 0; i < SwapChainCount; ++i)

{

m_SwapChain->GetBuffer(i, __uuidof(ID3D12Resource), reinterpret_cast<void**>(&m_SwapChainBuffer[i]));

m_Dev->CreateRenderTargetView(m_SwapChainBuffer[i].Get(), NULL, rtvHeapHandle);

rtvHeapHandle.Offset(1, m_RtvDescriptorSize);

}

D3D12_RESOURCE_DESC depthStencilDesc = { 0 };

depthStencilDesc.Dimension = D3D12_RESOURCE_DIMENSION_TEXTURE2D;

depthStencilDesc.Width = m_Width;

depthStencilDesc.Height = m_Height;

depthStencilDesc.DepthOrArraySize = 1;

depthStencilDesc.MipLevels = 1;

depthStencilDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;

depthStencilDesc.SampleDesc.Count = 1;

depthStencilDesc.SampleDesc.Quality = 0;

depthStencilDesc.Flags = D3D12_RESOURCE_FLAG_ALLOW_DEPTH_STENCIL;

D3D12_CLEAR_VALUE optClear;

optClear.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;

optClear.DepthStencil.Depth = 1.0f;

optClear.DepthStencil.Stencil = 0;

HRESULT hr = S_OK;

hr = m_Dev->CreateCommittedResource(&CD3DX12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_DEFAULT), D3D12_HEAP_FLAG_NONE, &depthStencilDesc, D3D12_RESOURCE_STATE_COMMON, &optClear, __uuidof(ID3D12Resource), reinterpret_cast<void**>(&m_DepthStencilBuffer));

m_Dev->CreateDepthStencilView(m_DepthStencilBuffer.Get(), NULL, DepthStencilView());

m_GfxCmdList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(m_DepthStencilBuffer.Get(), D3D12_RESOURCE_STATE_COMMON, D3D12_RESOURCE_STATE_DEPTH_WRITE));

hr = m_GfxCmdList->Close();

ID3D12CommandList* cmdLists[1] = { m_GfxCmdList.Get() };

m_CmdQueue->ExecuteCommandLists(1, cmdLists);

FlushCommandQueue();

}

void CGame::SetupViewportAndScissorRects()

{

D3D12_VIEWPORT vp;

vp.TopLeftX = 0.0f;

vp.TopLeftY = 0.0f;

vp.Width = static_cast<float>(m_Width);

vp.Height = static_cast<float>(m_Height);

vp.MinDepth = 0.0f;

vp.MaxDepth = 1.0f;

m_GfxCmdList->RSSetViewports(1, &vp);

D3D12_RECT scissorRect = { 0,0, m_Width, m_Height };

m_GfxCmdList->RSSetScissorRects(1, &scissorRect);

}

ID3D12Resource* CGame::CurrentBackBuffer() const

{

return m_SwapChainBuffer[m_CurrBackBuffer].Get();

}

D3D12_CPU_DESCRIPTOR_HANDLE CGame::CurrentBackBufferView() const

{

return CD3DX12_CPU_DESCRIPTOR_HANDLE(

m_RtvHeap->GetCPUDescriptorHandleForHeapStart(),

m_CurrBackBuffer,

m_RtvDescriptorSize);

}

D3D12_CPU_DESCRIPTOR_HANDLE CGame::DepthStencilView() const

{

return m_DSHeap->GetCPUDescriptorHandleForHeapStart();

}

void CGame::FlushCommandQueue()

{

// Advance the fence value to mark commands up to this fence point.

m_CurrentFence++;

// Add an instruction to the command queue to set a new fence point. Because we

// are on the GPU timeline, the new fence point won't be set until the GPU finishes

// processing all the commands prior to this Signal().

m_CmdQueue->Signal(m_Fence.Get(), m_CurrentFence);

// Wait until the GPU has completed commands up to this fence point.

if (m_Fence->GetCompletedValue() < m_CurrentFence)

{

HANDLE eventHandle = CreateEventEx(nullptr, false, false, EVENT_ALL_ACCESS);

// Fire event when GPU hits current fence.

m_Fence->SetEventOnCompletion(m_CurrentFence, eventHandle);

// Wait until the GPU hits current fence event is fired.

WaitForSingleObject(eventHandle, INFINITE);

CloseHandle(eventHandle);

}

void CGame::CreateConstantBuffer()

{

HRESULT hr = S_OK;

D3D12_DESCRIPTOR_HEAP_DESC heapDesc;

heapDesc.NumDescriptors = 1;

heapDesc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV;

heapDesc.NodeMask = 0;

heapDesc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_SHADER_VISIBLE;

hr = m_Dev->CreateDescriptorHeap(&heapDesc, __uuidof(ID3D12DescriptorHeap), reinterpret_cast<void**>(&m_CBVHeap));

m_ObjectCB = new UploadBuffer<ConstantBufferData>(m_Dev.Get(), 1, true);

UINT objCBByteSize = CalcConstantBufferByteSize(sizeof(ConstantBufferData));

D3D12_GPU_VIRTUAL_ADDRESS cbAddress = m_ObjectCB->Resource()->GetGPUVirtualAddress();

D3D12_CONSTANT_BUFFER_VIEW_DESC cbDesc;

cbDesc.BufferLocation = cbAddress;

cbDesc.SizeInBytes = objCBByteSize;

m_Dev->CreateConstantBufferView(&cbDesc, m_CBVHeap->GetCPUDescriptorHandleForHeapStart());

}

void CGame::CreateRootSignature()

{

HRESULT hr = S_OK;

CD3DX12_ROOT_PARAMETER slotRootParameter[1];

CD3DX12_DESCRIPTOR_RANGE cbvTable;

cbvTable.Init(D3D12_DESCRIPTOR_RANGE_TYPE_CBV, 1, 0);

slotRootParameter[0].InitAsDescriptorTable(1, &cbvTable);

CD3DX12_ROOT_SIGNATURE_DESC rsDesc(1, slotRootParameter, 0, NULL, D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT);

ID3DBlob* serializedRootSigBlob = NULL;

ID3DBlob* errorBlob = NULL;

hr = D3D12SerializeRootSignature(&rsDesc, D3D_ROOT_SIGNATURE_VERSION_1, &serializedRootSigBlob, &errorBlob);

hr = m_Dev->CreateRootSignature(0, serializedRootSigBlob->GetBufferPointer(), serializedRootSigBlob->GetBufferSize(), __uuidof(ID3D12RootSignature), reinterpret_cast<void**>(&m_RootSignature));

}

void CGame::CreateShadersAndInputLayout()

{

HRESULT hr = S_OK;

hr = D3DCompileFromFile(L"Assets/VertexShader.hlsl", NULL, NULL, "main", "vs_5_0", 0, 0, m_VSByteCode.GetAddressOf(), NULL);

hr = D3DCompileFromFile(L"Assets/PixelShader.hlsl", NULL, NULL, "main", "ps_5_0", 0, 0, m_PSByteCode.GetAddressOf(), NULL);

m_InputLayout[0] = D3D12_INPUT_ELEMENT_DESC(

{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA, 0 }

);

m_InputLayout[1] = D3D12_INPUT_ELEMENT_DESC(

{ "COLOR", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, D3D12_APPEND_ALIGNED_ELEMENT, D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA, 0 }

);

}

void CGame::CreateVertexBuffer()

{

m_GfxCmdList->Reset(m_CmdAllocator.Get(), NULL);

Vertex triangle[] =

{

{ -0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f },

{ 0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f },

{ -0.5f, -0.5f, 0.0f, 0.0f, 0.0f, 1.0f },

{ -0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f },

{ 0.5f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f },

{ 0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f },

};

m_VertexBufferGPU = CreateDefaultBuffer(m_Dev.Get(), m_GfxCmdList.Get(), triangle, 6 * sizeof(Vertex), m_VertexBufferUploader.Get());

HRESULT hr = m_GfxCmdList->Close();

ID3D12CommandList* cmdLists[1] = { m_GfxCmdList.Get() };

m_CmdQueue->ExecuteCommandLists(1, cmdLists);

FlushCommandQueue();

}

void CGame::CreateIndexBuffer()

{

m_GfxCmdList->Reset(m_CmdAllocator.Get(), NULL);

int indices[] = { 0, 1, 2, 0, 4, 1 };

m_IndexBufferGPU = CreateDefaultBuffer(m_Dev.Get(), m_GfxCmdList.Get(), indices, sizeof(int) * 6, m_IndexBufferUploader.Get());

HRESULT hr = m_GfxCmdList->Close();

ID3D12CommandList* cmdLists[1] = { m_GfxCmdList.Get() };

m_CmdQueue->ExecuteCommandLists(1, cmdLists);

FlushCommandQueue();

}

void CGame::CreatePSO()

{

HRESULT hr = S_OK;

D3D12_GRAPHICS_PIPELINE_STATE_DESC desc;

ZeroMemory(&desc, sizeof(D3D12_GRAPHICS_PIPELINE_STATE_DESC));

desc.InputLayout = { m_InputLayout, 2 };

desc.pRootSignature = m_RootSignature.Get();

desc.VS = {

reinterpret_cast<BYTE*>(m_VSByteCode->GetBufferPointer()),

m_VSByteCode->GetBufferSize()

};

desc.PS = {

reinterpret_cast<BYTE*>(m_PSByteCode->GetBufferPointer()),

m_PSByteCode->GetBufferSize()

};

desc.RasterizerState = CD3DX12_RASTERIZER_DESC(D3D12_DEFAULT);

desc.BlendState = CD3DX12_BLEND_DESC(D3D12_DEFAULT);

desc.DepthStencilState = CD3DX12_DEPTH_STENCIL_DESC(D3D12_DEFAULT);

desc.SampleMask = UINT_MAX;

desc.PrimitiveTopologyType = D3D12_PRIMITIVE_TOPOLOGY_TYPE_TRIANGLE;

desc.NumRenderTargets = 1;

desc.RTVFormats[0] = DXGI_FORMAT_B8G8R8A8_UNORM;

desc.SampleDesc.Count = 1;

desc.SampleDesc.Quality = 0;

desc.DSVFormat = DXGI_FORMAT_D24_UNORM_S8_UINT;

hr = m_Dev->CreateGraphicsPipelineState(&desc, __uuidof(ID3D12PipelineState), reinterpret_cast<void**>(&m_PipelineStateObject));

}

void CGame::Initialize(void * windowHandle, int width, int height)

{

m_WindowHandle = static_cast<int*>(windowHandle);

m_Width = width;

m_Height = height;

m_AspectRatio = (float)width / (float)height;

HRESULT hr = S_OK;

EnableD3D12DebugMode();

hr = CreateDXGIFactory1(__uuidof(IDXGIFactory4), reinterpret_cast<void**>(&m_DXGIFactory));

hr = D3D12CreateDevice(NULL, D3D_FEATURE_LEVEL_12_1, __uuidof(ID3D12Device), reinterpret_cast<void**>(&m_Dev));

m_CurrentFence = 0;

hr = m_Dev->CreateFence(0, D3D12_FENCE_FLAG_NONE, __uuidof(ID3D12Fence), reinterpret_cast<void**>(&m_Fence));

CreateCommandObjects();

CreateSwapChain();

CreateRtvAndDSHeaps();

CreateBackbufferRtvAndDsv();

CreateConstantBuffer();

CreateRootSignature();

CreateShadersAndInputLayout();

CreateVertexBuffer();

CreateIndexBuffer();

CreatePSO();

CreateDrawCommandList();

}

void CGame::Shutdown()

{

FlushCommandQueue();

}

void CGame::Update()

{

XMMATRIX matWorld = XMMatrixRotationY(3.14159f);

XMVECTOR vecCamPos = XMVectorSet(0.0f, 0.0f, 1.5f, 0);

XMVECTOR vecCamLookAt = XMVectorSet(0, 0, 0, 0);

XMVECTOR vecCamUp = XMVectorSet(0, 1, 0, 0);

XMMATRIX matView = XMMatrixLookAtLH(vecCamPos, vecCamLookAt, vecCamUp);

XMMATRIX matProjection = XMMatrixPerspectiveFovLH(

XMConvertToRadians(45),

m_AspectRatio,

100);

XMMATRIX matMVP = matWorld * matView * matProjection;

ConstantBufferData constantBufferData;

constantBufferData.matrixWorld = matWorld;

constantBufferData.matrixView = matView;

constantBufferData.matrixProjection = matProjection;

m_ObjectCB->CopyData(0, constantBufferData);

}

void CGame::Render()

{

HRESULT hr = S_OK;

hr = m_CmdAllocator->Reset();

hr = m_GfxCmdList->Reset(m_CmdAllocator.Get(), m_PipelineStateObject.Get());

m_GfxCmdList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(CurrentBackBuffer(),

D3D12_RESOURCE_STATE_PRESENT, D3D12_RESOURCE_STATE_RENDER_TARGET));

SetupViewportAndScissorRects();

float color[4] = { 0.0f, 0.0f, 0.0f, 1.0f };

m_GfxCmdList->ClearRenderTargetView(CurrentBackBufferView(), color, 0, NULL);

m_GfxCmdList->ClearDepthStencilView(DepthStencilView(), D3D12_CLEAR_FLAG_DEPTH | D3D12_CLEAR_FLAG_STENCIL, 1.0f, 0, 0, NULL);

m_GfxCmdList->OMSetRenderTargets(1, &CurrentBackBufferView(), true, &DepthStencilView());

m_GfxCmdList->SetGraphicsRootSignature(m_RootSignature.Get());

ID3D12DescriptorHeap* descHeaps = { m_CBVHeap.Get() };

m_GfxCmdList->SetDescriptorHeaps(1, &descHeaps);

m_GfxCmdList->SetGraphicsRootDescriptorTable(0, m_CBVHeap->GetGPUDescriptorHandleForHeapStart());

m_GfxCmdList->ExecuteBundle(m_DrawCmdList.Get());

m_GfxCmdList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(CurrentBackBuffer(),

D3D12_RESOURCE_STATE_RENDER_TARGET, D3D12_RESOURCE_STATE_PRESENT));

m_GfxCmdList->Close();

ID3D12CommandList* cmdLsts[] = { m_GfxCmdList.Get() };

m_CmdQueue->ExecuteCommandLists(1, cmdLsts);

m_SwapChain->Present(0, 0);

m_CurrBackBuffer = (m_CurrBackBuffer + 1) % SwapChainCount;

FlushCommandQueue();

}

UploadBuffer.h

#pragma once

#include "d3d12.h"

static UINT CalcConstantBufferByteSize(UINT byteSize)
{
	// Constant buffers must be a multiple of the minimum hardware
	// allocation size (usually 256 bytes).  So round up to nearest
	// multiple of 256.  We do this by adding 255 and then masking off
	// the lower 2 bytes which store all bits < 256.
	// Example: Suppose byteSize = 300.
	// (300 + 255) & ~255
	// 555 & ~255
	// 0x022B & ~0x00ff
	// 0x022B & 0xff00
	// 0x0200
	// 512
	return (byteSize + 255) & ~255;
}

template<typename T>
class UploadBuffer
{
public:
    UploadBuffer(ID3D12Device* device, UINT elementCount, bool isConstantBuffer) : 
        mIsConstantBuffer(isConstantBuffer)
    {
        mElementByteSize = sizeof(T);

        // Constant buffer elements need to be multiples of 256 bytes.
        // This is because the hardware can only view constant data 
        // at m*256 byte offsets and of n*256 byte lengths. 
        // typedef struct D3D12_CONSTANT_BUFFER_VIEW_DESC {
        // UINT64 OffsetInBytes; // multiple of 256
        // UINT   SizeInBytes;   // multiple of 256
        // } D3D12_CONSTANT_BUFFER_VIEW_DESC;
        if(isConstantBuffer)
            mElementByteSize = CalcConstantBufferByteSize(sizeof(T));

        device->CreateCommittedResource(
            &CD3DX12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_UPLOAD),
            D3D12_HEAP_FLAG_NONE,
            &CD3DX12_RESOURCE_DESC::Buffer(mElementByteSize*elementCount),
			D3D12_RESOURCE_STATE_GENERIC_READ,
            nullptr,
            IID_PPV_ARGS(&mUploadBuffer));

        mUploadBuffer->Map(0, nullptr, reinterpret_cast<void**>(&mMappedData));

        // We do not need to unmap until we are done with the resource.  However, we must not write to
        // the resource while it is in use by the GPU (so we must use synchronization techniques).
    }

    UploadBuffer(const UploadBuffer& rhs) = delete;
    UploadBuffer& operator=(const UploadBuffer& rhs) = delete;
    ~UploadBuffer()
    {
        if(mUploadBuffer != nullptr)
            mUploadBuffer->Unmap(0, nullptr);

        mMappedData = nullptr;
    }

    ID3D12Resource* Resource()const
    {
		return mUploadBuffer;
    }

    void CopyData(int elementIndex, const T& data)
    {
        memcpy(&mMappedData[elementIndex*mElementByteSize], &data, sizeof(T));
    }

private:
    ID3D12Resource* mUploadBuffer;
    BYTE* mMappedData = nullptr;

    UINT mElementByteSize = 0;
    bool mIsConstantBuffer = false;
};

#pragma once

#include "d3d12.h"

static UINT CalcConstantBufferByteSize(UINT byteSize)

{

// Constant buffers must be a multiple of the minimum hardware

// allocation size (usually 256 bytes). So round up to nearest

// multiple of 256. We do this by adding 255 and then masking off

// the lower 2 bytes which store all bits < 256.

// Example: Suppose byteSize = 300.

// (300 + 255) & ~255

// 555 & ~255

// 0x022B & ~0x00ff

// 0x022B & 0xff00

// 0x0200

// 512

return (byteSize + 255) & ~255;

}

template<typename T>

class UploadBuffer

{

public:

UploadBuffer(ID3D12Device* device, UINT elementCount, bool isConstantBuffer) :

mIsConstantBuffer(isConstantBuffer)

{

mElementByteSize = sizeof(T);

// Constant buffer elements need to be multiples of 256 bytes.

// This is because the hardware can only view constant data

// at m*256 byte offsets and of n*256 byte lengths.

// typedef struct D3D12_CONSTANT_BUFFER_VIEW_DESC {

// UINT64 OffsetInBytes; // multiple of 256

// UINT SizeInBytes; // multiple of 256

// } D3D12_CONSTANT_BUFFER_VIEW_DESC;

if(isConstantBuffer)

mElementByteSize = CalcConstantBufferByteSize(sizeof(T));

device->CreateCommittedResource(

&CD3DX12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_UPLOAD),

D3D12_HEAP_FLAG_NONE,

&CD3DX12_RESOURCE_DESC::Buffer(mElementByteSize*elementCount),

D3D12_RESOURCE_STATE_GENERIC_READ,

nullptr,

IID_PPV_ARGS(&mUploadBuffer));

mUploadBuffer->Map(0, nullptr, reinterpret_cast<void**>(&mMappedData));

// We do not need to unmap until we are done with the resource. However, we must not write to

// the resource while it is in use by the GPU (so we must use synchronization techniques).

}

UploadBuffer(const UploadBuffer& rhs) = delete;

UploadBuffer& operator=(const UploadBuffer& rhs) = delete;

~UploadBuffer()

{

if(mUploadBuffer != nullptr)

mUploadBuffer->Unmap(0, nullptr);

mMappedData = nullptr;

}

ID3D12Resource* Resource()const

{

return mUploadBuffer;

}

void CopyData(int elementIndex, const T& data)

{

memcpy(&mMappedData[elementIndex*mElementByteSize], &data, sizeof(T));

}

private:

ID3D12Resource* mUploadBuffer;

BYTE* mMappedData = nullptr;

UINT mElementByteSize = 0;

bool mIsConstantBuffer = false;

};

VertexShader.hlsl

cbuffer ConstantBufferData
{
	float4x4 matrixWorld;
	float4x4 matrixView;
	float4x4 matrixProjection;
}

struct v2f
{
	float4 position : SV_POSITION;
	float4 color : COLOR0;
};

v2f main( float4 pos : POSITION, float4 color : COLOR )
{
	v2f o;

	float4 worldPos = mul(matrixWorld, pos);
	float4x4 matVP = mul(matrixProjection, matrixView);

	o.position = mul(matVP, worldPos);
	o.color = color;

	return o;
}

cbuffer ConstantBufferData

{

float4x4 matrixWorld;

float4x4 matrixView;

float4x4 matrixProjection;

}

struct v2f

{

float4 position : SV_POSITION;

float4 color : COLOR0;

};

v2f main( float4 pos : POSITION, float4 color : COLOR )

{

v2f o;

float4 worldPos = mul(matrixWorld, pos);

float4x4 matVP = mul(matrixProjection, matrixView);

o.position = mul(matVP, worldPos);

o.color = color;

return o;

}

PixelShader.hlsl

struct v2f
{
	float4 position : SV_POSITION;
	float4 color : COLOR;
};

float4 main(v2f i) : SV_TARGET
{
	return float4(i.color.rgb, 1.0);
}

struct v2f

{

float4 position : SV_POSITION;

float4 color : COLOR;

};

float4 main(v2f i) : SV_TARGET

{

return float4(i.color.rgb, 1.0);

}

xdPixel

Category Archives: Quick N Dirty Gfx Samples

DirectX 12 Hello World Sample

Purpose of the Sample:

CGame.h

CGame.cpp

UploadBuffer.h

VertexShader.hlsl

PixelShader.hlsl

Download Sample App

Practical Computer Graphics