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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "engine.h"
#include <QLibrary>
#include <comdef.h>
#define ENABLE_DEBUG_LAYER
Engine::~Engine()
{
RELEASE(m_context);
RELEASE(m_device);
RELEASE(m_dxgiFactory);
}
QString comErrorMessage(HRESULT hr)
{
const _com_error comError(hr);
QString result = QLatin1String("Error 0x") + QString::number(ulong(hr), 16);
if (const wchar_t *msg = comError.ErrorMessage())
result += QLatin1String(": ") + QString::fromWCharArray(msg);
return result;
}
bool Engine::create()
{
using PtrCreateDXGIFactory2 = HRESULT (WINAPI *)(UINT, REFIID, void **);
QLibrary dxgilib(QStringLiteral("dxgi"));
if (auto createDXGIFactory2 = reinterpret_cast<PtrCreateDXGIFactory2>(dxgilib.resolve("CreateDXGIFactory2"))) {
const HRESULT hr = createDXGIFactory2(0, IID_IDXGIFactory2, reinterpret_cast<void **>(&m_dxgiFactory));
if (FAILED(hr)) {
qWarning("CreateDXGIFactory2() failed to create DXGI factory: %s", qPrintable(comErrorMessage(hr)));
return false;
}
} else {
qWarning("Unable to resolve CreateDXGIFactory2()");
return false;
}
uint flags = 0;
#ifdef ENABLE_DEBUG_LAYER
flags |= D3D11_CREATE_DEVICE_DEBUG;
#endif
// use the default hardware adapter
HRESULT hr = D3D11CreateDevice(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, flags,
nullptr, 0, D3D11_SDK_VERSION,
&m_device, &m_featureLevel, &m_context);
if (FAILED(hr)) {
qWarning("Failed to create D3D11 device and context: %s", qPrintable(comErrorMessage(hr)));
return false;
}
return true;
}
QSize Engine::swapchainSizeForWindow(QWindow *window) const
{
const QSize size = window->size() * window->devicePixelRatio();
return QSize(qMax(8, size.width()), qMax(8, size.height()));
}
Swapchain Engine::createSwapchain(QWindow *window)
{
Swapchain sc = {};
const HWND hwnd = reinterpret_cast<HWND>(window->winId());
const QSize pixelSize = swapchainSizeForWindow(window);
// only care about flip discard swapchains here; the old stuff (discard) is
// not supported in this example
DXGI_SWAP_CHAIN_DESC1 desc = {};
desc.Width = UINT(pixelSize.width());
desc.Height = UINT(pixelSize.height());
desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
desc.SampleDesc.Count = 1;
desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
desc.BufferCount = 2;
desc.Scaling = DXGI_SCALING_STRETCH;
desc.SwapEffect = DXGI_SWAP_EFFECT(4); // DXGI_SWAP_EFFECT_FLIP_DISCARD
IDXGISwapChain1 *swapchain = nullptr;
HRESULT hr = static_cast<IDXGIFactory2 *>(m_dxgiFactory)->CreateSwapChainForHwnd(m_device, hwnd, &desc,
nullptr, nullptr, &swapchain);
if (FAILED(hr)) {
qWarning("Failed to create D3D11 swapchain: %s", qPrintable(comErrorMessage(hr)));
return sc;
}
sc.swapchain = swapchain;
sc.pixelSize = pixelSize;
createSwapchainBuffers(&sc);
return sc;
}
void Engine::createSwapchainBuffers(Swapchain *sc)
{
ID3D11Texture2D *tex = nullptr;
HRESULT hr = sc->swapchain->GetBuffer(0, IID_ID3D11Texture2D, reinterpret_cast<void **>(&tex));
if (FAILED(hr)) {
qWarning("Failed to query swapchain backbuffer: %s", qPrintable(comErrorMessage(hr)));
return;
}
ID3D11RenderTargetView *rtv = nullptr;
D3D11_RENDER_TARGET_VIEW_DESC rtvDesc = {};
rtvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;
hr = m_device->CreateRenderTargetView(tex, &rtvDesc, &rtv);
if (FAILED(hr)) {
qWarning("Failed to create rtv for swapchain backbuffer: %s", qPrintable(comErrorMessage(hr)));
tex->Release();
return;
}
D3D11_TEXTURE2D_DESC texDesc = {};
texDesc.Width = UINT(sc->pixelSize.width());
texDesc.Height = UINT(sc->pixelSize.height());
texDesc.MipLevels = 1;
texDesc.ArraySize = 1;
texDesc.SampleDesc.Count = 1;
texDesc.Usage = D3D11_USAGE_DEFAULT;
texDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
texDesc.BindFlags = D3D11_BIND_DEPTH_STENCIL;
ID3D11Texture2D *ds = nullptr;
hr = m_device->CreateTexture2D(&texDesc, nullptr, &ds);
if (FAILED(hr)) {
qWarning("Failed to create depth-stencil buffer: %s", qPrintable(comErrorMessage(hr)));
tex->Release();
rtv->Release();
return;
}
ID3D11DepthStencilView *dsv = nullptr;
D3D11_DEPTH_STENCIL_VIEW_DESC dsvDesc = {};
dsvDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
dsvDesc.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;
hr = m_device->CreateDepthStencilView(ds, &dsvDesc, &dsv);
if (FAILED(hr)) {
qWarning("Failed to create dsv: %s", qPrintable(comErrorMessage(hr)));
tex->Release();
rtv->Release();
ds->Release();
return;
}
sc->tex = tex;
sc->rtv = rtv;
sc->ds = ds;
sc->dsv = dsv;
}
void Engine::resizeSwapchain(Swapchain *sc, QWindow *window)
{
const QSize pixelSize = swapchainSizeForWindow(window);
RELEASE(sc->dsv);
RELEASE(sc->ds);
RELEASE(sc->rtv);
RELEASE(sc->tex);
HRESULT hr = sc->swapchain->ResizeBuffers(2, UINT(pixelSize.width()), UINT(pixelSize.height()),
DXGI_FORMAT_R8G8B8A8_UNORM, 0);
if (FAILED(hr)) {
qWarning("Failed to resize D3D11 swapchain: %s", qPrintable(comErrorMessage(hr)));
return;
}
sc->pixelSize = pixelSize;
createSwapchainBuffers(sc);
}
void Swapchain::destroy()
{
RELEASE(dsv);
RELEASE(ds);
RELEASE(rtv);
RELEASE(tex);
RELEASE(swapchain);
pixelSize = QSize();
}
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