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419 lines
15 KiB
C++
419 lines
15 KiB
C++
// ImGui - standalone example application for DirectX 11
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// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
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#include <assert.h>
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#include <imgui.h>
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#include "imgui_impl_dx12.h"
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#include <d3d12.h>
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#include <dxgi1_4.h>
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#include <tchar.h>
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struct FrameContext
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{
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ID3D12CommandAllocator* CommandAllocator;
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UINT64 FenceValue;
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bool FenceSignalled;
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};
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// Data
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static int const NUM_FRAMES_IN_FLIGHT = 3;
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static FrameContext g_frameContext[NUM_FRAMES_IN_FLIGHT] = {};
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static UINT g_frameIndex = 0;
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static int const NUM_BACK_BUFFERS = 3;
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static IDXGIFactory4* g_pdxgiFactory = NULL;
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static ID3D12Device* g_pd3dDevice = NULL;
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static ID3D12DescriptorHeap* g_pd3dRtvDescHeap = NULL;
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static ID3D12DescriptorHeap* g_pd3dSrvDescHeap = NULL;
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static ID3D12CommandQueue* g_pd3dCommandQueue = NULL;
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static ID3D12GraphicsCommandList* g_pd3dCommandList = NULL;
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static ID3D12Fence* g_fence = NULL;
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static HANDLE g_fenceEvent = NULL;
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static UINT64 g_fenceLastSignalledValue = 0;
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static IDXGISwapChain3* g_pSwapChain = NULL;
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static HANDLE g_hSwapChainWaitableObject = NULL;
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static ID3D12Resource* g_mainRenderTargetResource[NUM_BACK_BUFFERS] = {};
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static D3D12_CPU_DESCRIPTOR_HANDLE g_mainRenderTargetDescriptor[NUM_BACK_BUFFERS] = {};
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static void WaitForLastSubmittedFrame()
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{
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FrameContext* frameCtxt = &g_frameContext[g_frameIndex % NUM_FRAMES_IN_FLIGHT];
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UINT64 fenceValue = frameCtxt->FenceValue;
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if (fenceValue == 0) { // means no fence was signalled
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return;
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}
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frameCtxt->FenceValue = 0;
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if (g_fence->GetCompletedValue() >= fenceValue) {
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return;
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}
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HRESULT hr = g_fence->SetEventOnCompletion(fenceValue, g_fenceEvent);
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assert(SUCCEEDED(hr));
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WaitForSingleObject(g_fenceEvent, INFINITE);
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}
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static FrameContext* WaitForNextFrameResources()
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{
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UINT nextFrameIndex = g_frameIndex + 1;
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g_frameIndex = nextFrameIndex;
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HANDLE waitableObjects[] = {
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g_hSwapChainWaitableObject,
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NULL,
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};
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DWORD numWaitableObjects = 1;
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FrameContext* frameCtxt = &g_frameContext[nextFrameIndex % NUM_FRAMES_IN_FLIGHT];
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UINT64 fenceValue = frameCtxt->FenceValue;
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if (fenceValue != 0) { // means no fence was signalled
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frameCtxt->FenceValue = 0;
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HRESULT hr = g_fence->SetEventOnCompletion(fenceValue, g_fenceEvent);
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assert(SUCCEEDED(hr));
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waitableObjects[1] = g_fenceEvent;
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numWaitableObjects = 2;
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}
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HRESULT hr = WaitForMultipleObjects(numWaitableObjects, waitableObjects, TRUE, INFINITE);
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assert(SUCCEEDED(hr));
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return frameCtxt;
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}
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void CreateRenderTarget(HWND hWnd, int width, int height)
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{
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DXGI_SWAP_CHAIN_DESC1 desc = {};
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desc.Width = width;
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desc.Height = height;
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desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
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desc.Stereo = FALSE;
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desc.SampleDesc.Count = 1;
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desc.SampleDesc.Quality = 0;
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desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
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desc.BufferCount = NUM_BACK_BUFFERS;
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desc.Scaling = DXGI_SCALING_STRETCH;
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desc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
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desc.AlphaMode = DXGI_ALPHA_MODE_UNSPECIFIED;
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desc.Flags = DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT;
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IDXGISwapChain1* swapChain1 = NULL;
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HRESULT hr = g_pdxgiFactory->CreateSwapChainForHwnd(g_pd3dCommandQueue, hWnd, &desc, NULL, NULL, &swapChain1);
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assert(SUCCEEDED(hr));
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hr = swapChain1->QueryInterface(IID_PPV_ARGS(&g_pSwapChain));
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assert(SUCCEEDED(hr));
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swapChain1->Release();
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hr = g_pSwapChain->SetMaximumFrameLatency(NUM_BACK_BUFFERS);
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assert(SUCCEEDED(hr));
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g_hSwapChainWaitableObject = g_pSwapChain->GetFrameLatencyWaitableObject();
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assert(g_hSwapChainWaitableObject != NULL);
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for (UINT i = 0; i < NUM_BACK_BUFFERS; ++i)
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{
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hr = g_pSwapChain->GetBuffer(i, IID_PPV_ARGS(&g_mainRenderTargetResource[i]));
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assert(SUCCEEDED(hr));
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g_pd3dDevice->CreateRenderTargetView(g_mainRenderTargetResource[i], NULL, g_mainRenderTargetDescriptor[i]);
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}
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}
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void CleanupRenderTarget()
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{
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WaitForLastSubmittedFrame();
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if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = NULL; }
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for (UINT i = 0; i < NUM_BACK_BUFFERS; ++i)
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{
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if (g_mainRenderTargetResource[i]) { g_mainRenderTargetResource[i]->Release(); g_mainRenderTargetResource[i] = NULL; }
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}
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if (g_hSwapChainWaitableObject != NULL) { CloseHandle(g_hSwapChainWaitableObject); }
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}
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HRESULT CreateDeviceD3D(HWND hWnd)
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{
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(void) hWnd;
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#ifdef _DEBUG
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{
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ID3D12Debug* debugController = NULL;
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if (SUCCEEDED(D3D12GetDebugInterface(IID_PPV_ARGS(&debugController))))
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{
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debugController->EnableDebugLayer();
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debugController->Release();
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}
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}
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#endif
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if (CreateDXGIFactory1(IID_PPV_ARGS(&g_pdxgiFactory)) != S_OK)
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return E_FAIL;
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IDXGIAdapter1* adapter = NULL;
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for (UINT adapterIndex = 0; DXGI_ERROR_NOT_FOUND != g_pdxgiFactory->EnumAdapters1(adapterIndex, &adapter); ++adapterIndex)
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{
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DXGI_ADAPTER_DESC1 desc = {};
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adapter->GetDesc1(&desc);
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if (desc.Flags & DXGI_ADAPTER_FLAG_SOFTWARE)
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{
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adapter->Release();
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continue;
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}
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if (FAILED(D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_11_0, _uuidof(ID3D12Device), NULL)))
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{
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adapter->Release();
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continue;
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}
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break;
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}
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HRESULT hr = D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_11_0, IID_PPV_ARGS(&g_pd3dDevice));
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if (adapter != NULL)
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{
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adapter->Release();
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}
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if (FAILED(hr))
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return hr;
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{
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D3D12_DESCRIPTOR_HEAP_DESC desc = {};
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desc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_RTV;
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desc.NumDescriptors = NUM_BACK_BUFFERS;
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desc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE;
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desc.NodeMask = 1;
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if (g_pd3dDevice->CreateDescriptorHeap(&desc, IID_PPV_ARGS(&g_pd3dRtvDescHeap)) != S_OK)
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return E_FAIL;
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SIZE_T rtvDescriptorSize = g_pd3dDevice->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_RTV);
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D3D12_CPU_DESCRIPTOR_HANDLE rtvHandle = g_pd3dRtvDescHeap->GetCPUDescriptorHandleForHeapStart();
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for (UINT i = 0; i < NUM_BACK_BUFFERS; ++i) {
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g_mainRenderTargetDescriptor[i] = rtvHandle;
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rtvHandle.ptr += rtvDescriptorSize;
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}
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}
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{
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D3D12_DESCRIPTOR_HEAP_DESC desc = {};
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desc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV;
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desc.NumDescriptors = 1;
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desc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_SHADER_VISIBLE;
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if (g_pd3dDevice->CreateDescriptorHeap(&desc, IID_PPV_ARGS(&g_pd3dSrvDescHeap)) != S_OK)
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return E_FAIL;
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}
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{
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D3D12_COMMAND_QUEUE_DESC desc = {};
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desc.Type = D3D12_COMMAND_LIST_TYPE_DIRECT;
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desc.Flags = D3D12_COMMAND_QUEUE_FLAG_NONE;
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desc.NodeMask = 1;
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if (g_pd3dDevice->CreateCommandQueue(&desc, IID_PPV_ARGS(&g_pd3dCommandQueue)) != S_OK)
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return E_FAIL;
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}
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for (UINT i = 0; i < NUM_FRAMES_IN_FLIGHT; ++i)
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{
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if (g_pd3dDevice->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, IID_PPV_ARGS(&g_frameContext[i].CommandAllocator)) != S_OK)
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return E_FAIL;
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}
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if (g_pd3dDevice->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, g_frameContext[0].CommandAllocator, NULL, IID_PPV_ARGS(&g_pd3dCommandList)) != S_OK ||
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g_pd3dCommandList->Close() != S_OK)
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return E_FAIL;
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if (g_pd3dDevice->CreateFence(0, D3D12_FENCE_FLAG_NONE, IID_PPV_ARGS(&g_fence)) != S_OK)
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return E_FAIL;
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g_fenceEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
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if (g_fenceEvent == NULL)
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return E_FAIL;
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return S_OK;
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}
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void CleanupDeviceD3D()
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{
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CleanupRenderTarget();
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for (UINT i = 0; i < NUM_FRAMES_IN_FLIGHT; ++i)
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{
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if (g_frameContext[i].CommandAllocator) { g_frameContext[i].CommandAllocator->Release(); g_frameContext[i].CommandAllocator = NULL; }
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}
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if (g_pd3dCommandQueue) { g_pd3dCommandQueue->Release(); g_pd3dCommandQueue = NULL; }
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if (g_pd3dCommandList) { g_pd3dCommandList->Release(); g_pd3dCommandList = NULL; }
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if (g_pd3dRtvDescHeap) { g_pd3dRtvDescHeap->Release(); g_pd3dRtvDescHeap = NULL; }
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if (g_pd3dSrvDescHeap) { g_pd3dSrvDescHeap->Release(); g_pd3dSrvDescHeap = NULL; }
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if (g_fence) { g_fence->Release(); g_fence = NULL; }
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if (g_fenceEvent) { CloseHandle(g_fenceEvent); g_fenceEvent = NULL; }
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if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
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if (g_pdxgiFactory) { g_pdxgiFactory->Release(); g_pdxgiFactory = NULL; }
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}
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extern LRESULT ImGui_ImplDX12_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
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LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
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{
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if (ImGui_ImplDX12_WndProcHandler(hWnd, msg, wParam, lParam))
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return true;
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switch (msg)
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{
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case WM_SIZE:
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if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED)
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{
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ImGui_ImplDX12_InvalidateDeviceObjects();
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CleanupRenderTarget();
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CreateRenderTarget(hWnd, (UINT)LOWORD(lParam), (UINT)HIWORD(lParam));
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ImGui_ImplDX12_CreateDeviceObjects();
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}
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return 0;
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case WM_SYSCOMMAND:
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if ((wParam & 0xfff0) == SC_KEYMENU) // Disable ALT application menu
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return 0;
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break;
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case WM_DESTROY:
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PostQuitMessage(0);
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return 0;
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}
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return DefWindowProc(hWnd, msg, wParam, lParam);
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}
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int main(int, char**)
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{
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// Create application window
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WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(NULL), NULL, LoadCursor(NULL, IDC_ARROW), NULL, NULL, _T("ImGui Example"), NULL };
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RegisterClassEx(&wc);
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HWND hwnd = CreateWindow(_T("ImGui Example"), _T("ImGui DirectX12 Example"), WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, NULL, NULL, wc.hInstance, NULL);
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// Initialize Direct3D
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if (CreateDeviceD3D(hwnd) < 0)
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{
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CleanupDeviceD3D();
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UnregisterClass(_T("ImGui Example"), wc.hInstance);
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return 1;
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}
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// Show the window
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ShowWindow(hwnd, SW_SHOWDEFAULT);
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UpdateWindow(hwnd);
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// Setup ImGui binding
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ImGui_ImplDX12_Init(hwnd, NUM_FRAMES_IN_FLIGHT, g_pd3dDevice, g_pd3dCommandList,
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g_pd3dSrvDescHeap->GetCPUDescriptorHandleForHeapStart(),
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g_pd3dSrvDescHeap->GetGPUDescriptorHandleForHeapStart());
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// Load Fonts
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// (there is a default font, this is only if you want to change it. see extra_fonts/README.txt for more details)
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//ImGuiIO& io = ImGui::GetIO();
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//io.Fonts->AddFontDefault();
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//io.Fonts->AddFontFromFileTTF("../../extra_fonts/Cousine-Regular.ttf", 15.0f);
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//io.Fonts->AddFontFromFileTTF("../../extra_fonts/DroidSans.ttf", 16.0f);
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//io.Fonts->AddFontFromFileTTF("../../extra_fonts/ProggyClean.ttf", 13.0f);
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//io.Fonts->AddFontFromFileTTF("../../extra_fonts/ProggyTiny.ttf", 10.0f);
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//io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
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bool show_test_window = true;
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bool show_another_window = false;
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ImVec4 clear_col = ImColor(114, 144, 154);
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// Main loop
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MSG msg;
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ZeroMemory(&msg, sizeof(msg));
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while (msg.message != WM_QUIT)
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{
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if (PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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continue;
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}
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// Wait for frame resources to be available
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ImGui_ImplDX12_NewFrame();
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// 1. Show a simple window
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// Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
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{
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static float f = 0.0f;
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ImGui::Text("Hello, world!");
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ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
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ImGui::ColorEdit3("clear color", (float*)&clear_col);
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if (ImGui::Button("Test Window")) show_test_window ^= 1;
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if (ImGui::Button("Another Window")) show_another_window ^= 1;
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ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
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}
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// 2. Show another simple window, this time using an explicit Begin/End pair
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if (show_another_window)
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{
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ImGui::SetNextWindowSize(ImVec2(200,100), ImGuiSetCond_FirstUseEver);
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ImGui::Begin("Another Window", &show_another_window);
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ImGui::Text("Hello");
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ImGui::End();
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}
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// 3. Show the ImGui test window. Most of the sample code is in ImGui::ShowTestWindow()
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if (show_test_window)
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{
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ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiSetCond_FirstUseEver); // Normally user code doesn't need/want to call it because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
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ImGui::ShowTestWindow(&show_test_window);
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}
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// Rendering
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FrameContext* frameCtxt = WaitForNextFrameResources();
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UINT backBufferIdx = g_pSwapChain->GetCurrentBackBufferIndex();
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HRESULT hr = frameCtxt->CommandAllocator->Reset();
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assert(SUCCEEDED(hr));
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hr = g_pd3dCommandList->Reset(frameCtxt->CommandAllocator, NULL);
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assert(SUCCEEDED(hr));
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D3D12_RESOURCE_BARRIER barrier = {};
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barrier.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
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barrier.Flags = D3D12_RESOURCE_BARRIER_FLAG_NONE;
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barrier.Transition.pResource = g_mainRenderTargetResource[backBufferIdx];
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barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
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barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_PRESENT;
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barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_RENDER_TARGET;
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g_pd3dCommandList->ResourceBarrier(1, &barrier);
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g_pd3dCommandList->ClearRenderTargetView(g_mainRenderTargetDescriptor[backBufferIdx], (float*)&clear_col, 0, NULL);
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g_pd3dCommandList->OMSetRenderTargets(1, &g_mainRenderTargetDescriptor[backBufferIdx], FALSE, NULL);
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g_pd3dCommandList->SetDescriptorHeaps(1, &g_pd3dSrvDescHeap);
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ImGui::Render();
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barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_RENDER_TARGET;
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barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_PRESENT;
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g_pd3dCommandList->ResourceBarrier(1, &barrier);
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hr = g_pd3dCommandList->Close();
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assert(SUCCEEDED(hr));
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g_pd3dCommandQueue->ExecuteCommandLists(1, (ID3D12CommandList* const*) &g_pd3dCommandList);
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hr = g_pSwapChain->Present(1, 0);
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assert(SUCCEEDED(hr));
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auto fenceValue = g_fenceLastSignalledValue + 1;
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hr = g_pd3dCommandQueue->Signal(g_fence, fenceValue);
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assert(SUCCEEDED(hr));
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g_fenceLastSignalledValue = fenceValue;
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frameCtxt->FenceValue = fenceValue;
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}
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ImGui_ImplDX12_Shutdown();
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CleanupDeviceD3D();
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UnregisterClass(_T("ImGui Example"), wc.hInstance);
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return 0;
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}
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