从零开始开发3D游戏引擎 - 在QtWidget中进行Direct3D11渲染，并捕捉Windows消息

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DirectX 渲染

创建一个继承QWidget的类，重写paintEvent，resizeEvent
但是仅仅这样还不够，画面会一直闪烁，需要重写以下函数
virtual QPaintEngine paintEngine() const { return NULL; }*
并设置窗口属性
this->setAttribute(Qt::WA_PaintOnScreen, true);
this->setAttribute(Qt::WA_NativeWindow, true);

捕捉Windows的消息

重写nativeEventFilter，继承 public QAbstractNativeEventFilter 接口
并砸application里面install

QApplication a(argc, argv);
BugattiEngine w;
w.show();
a.installNativeEventFilter(&w);
a.installNativeEventFilter(w.GetRenderWidget());

#pragma once
#include <qwidget.h>
#include "Render/D3DX11Entry.h"
class RenderWidget :public QWidget, public QAbstractNativeEventFilter
{
public:RenderWidget(QWidget* parent = nullptr);virtual ~RenderWidget();D3DX11Entry d3d11_entry;QWidget* main_window;HWND hwnd;bool has_init;virtual QPaintEngine* paintEngine() const { return NULL; }void Init(UINT width = 800, UINT height = 600);
protected://virtual void resizeEvent(QResizeEvent* evt);virtual void paintEvent(QPaintEvent* evt); virtual void timerEvent(QTimerEvent *event);virtual bool nativeEventFilter(const QByteArray &eventType, void *message, long *) Q_DECL_OVERRIDE;
};RenderWidget::RenderWidget(QWidget* parent) :QWidget(parent)
, d3d11_entry((HWND)this->winId())
, has_init(false)
{hwnd = (HWND)this->winId();this->setAttribute(Qt::WA_PaintOnScreen, true);this->setAttribute(Qt::WA_NativeWindow, true);startTimer(1000);main_window = parentWidget()->parentWidget();
}RenderWidget::~RenderWidget()
{d3d11_entry.CleanupDevice();
}void RenderWidget::Init(UINT width, UINT height)
{setFixedSize(width, height);d3d11_entry.SetSize(width, height);d3d11_entry.InitDevice();
}//QPainter painter(this);
//painter.drawLine(80, 100, 650, 500);
void RenderWidget::paintEvent(QPaintEvent * event)
{d3d11_entry.Render();update();
}void RenderWidget::timerEvent(QTimerEvent * event)
{main_window->setWindowTitle("FPS = " + QString::number(d3d11_entry.fps));
}bool RenderWidget::nativeEventFilter(const QByteArray &eventType, void *message, long *)
{if (eventType == "windows_generic_MSG" || eventType == "windows_dispatcher_MSG"){MSG* pMsg = reinterpret_cast<MSG*>(message);if (pMsg->message == WM_KEYDOWN){qDebug() << "RenderWidget windows system message WM_KEYDOWN";}}return false;
}