Merge pull request #6718 from spycrab/qt_freelook

Qt: Implement "Free look"

Source/Core/DolphinQt2/RenderWidget.cpp

@@ -6,12 +6,16 @@
 #include <QDesktopWidget>
 #include <QGuiApplication>
 #include <QKeyEvent>
+#include <QMouseEvent>
 #include <QPalette>
 #include <QScreen>
 #include <QTimer>
 
 #include "Core/ConfigManager.h"
 #include "Core/Core.h"
+#include "VideoCommon/VertexShaderManager.h"
+#include "VideoCommon/VideoConfig.h"
+
 #include "DolphinQt2/Host.h"
 #include "DolphinQt2/RenderWidget.h"
 #include "DolphinQt2/Settings.h"
@@ -120,6 +124,10 @@ bool RenderWidget::event(QEvent* event)
     break;
   }
   case QEvent::MouseMove:
+    if (g_Config.bFreeLook)
+      OnFreeLookMouseMove(static_cast<QMouseEvent*>(event));
+
+  // [[fallthrough]]
   case QEvent::MouseButtonPress:
     if (!Settings::Instance().GetHideCursor() && isActiveWindow())
     {
@@ -162,3 +170,22 @@ bool RenderWidget::event(QEvent* event)
   }
   return QWidget::event(event);
 }
+
+void RenderWidget::OnFreeLookMouseMove(QMouseEvent* event)
+{
+  if (event->buttons() & Qt::MidButton)
+  {
+    // Mouse Move
+    VertexShaderManager::TranslateView((event->x() - m_last_mouse[0]) / 50.0f,
+                                       (event->y() - m_last_mouse[1]) / 50.0f);
+  }
+  else if (event->buttons() & Qt::RightButton)
+  {
+    // Mouse Look
+    VertexShaderManager::RotateView((event->x() - m_last_mouse[0]) / 200.0f,
+                                    (event->y() - m_last_mouse[1]) / 200.0f);
+  }
+
+  m_last_mouse[0] = event->x();
+  m_last_mouse[1] = event->y();
+}

Source/Core/DolphinQt2/RenderWidget.h

@@ -4,9 +4,12 @@
 
 #pragma once
 
+#include <array>
+
 #include <QEvent>
 #include <QWidget>
 
+class QMouseEvent;
 class QTimer;
 
 class RenderWidget final : public QWidget
@@ -31,7 +34,9 @@ class RenderWidget final : public QWidget
   void OnHideCursorChanged();
   void OnKeepOnTopChanged(bool top);
   void SetFillBackground(bool fill);
+  void OnFreeLookMouseMove(QMouseEvent* event);
 
   static constexpr int MOUSE_HIDE_DELAY = 3000;
   QTimer* m_mouse_timer;
+  std::array<float, 2> m_last_mouse{};
 };