OSD: Add option to show display resolution

src/core/gpu.cpp

@@ -59,6 +59,11 @@ void GPU::UpdateSettings()
 
 void GPU::UpdateResolutionScale() {}
 
+std::tuple<u32, u32> GPU::GetEffectiveDisplayResolution()
+{
+  return std::tie(m_crtc_state.display_vram_width, m_crtc_state.display_vram_height);
+}
+
 void GPU::Reset()
 {
   SoftReset();

src/core/gpu.h

@@ -144,6 +144,24 @@ public:
   }
   void EndDMAWrite();
 
+  /// Returns false if the DAC is loading any data from VRAM.
+  ALWAYS_INLINE bool IsDisplayDisabled() const
+  {
+    return m_GPUSTAT.display_disable || m_crtc_state.display_vram_width == 0 || m_crtc_state.display_vram_height == 0;
+  }
+
+  /// Returns true if scanout should be interlaced.
+  ALWAYS_INLINE bool IsInterlacedDisplayEnabled() const
+  {
+    return (!m_force_progressive_scan) & m_GPUSTAT.vertical_interlace;
+  }
+
+  /// Returns true if interlaced rendering is enabled and force progressive scan is disabled.
+  ALWAYS_INLINE bool IsInterlacedRenderingEnabled() const
+  {
+    return (!m_force_progressive_scan) & m_GPUSTAT.SkipDrawingToActiveField();
+  }
+
   /// Returns the number of pending GPU ticks.
   TickCount GetPendingCRTCTicks() const;
   TickCount GetPendingCommandTicks() const;
@@ -163,6 +181,9 @@ public:
   /// Updates the resolution scale when it's set to automatic.
   virtual void UpdateResolutionScale();
 
+  /// Returns the effective display resolution of the GPU.
+  virtual std::tuple<u32, u32> GetEffectiveDisplayResolution();
+
   // gpu_hw_d3d11.cpp
   static std::unique_ptr<GPU> CreateHardwareD3D11Renderer();
 
@@ -367,24 +388,6 @@ protected:
   void CRTCTickEvent(TickCount ticks);
   void CommandTickEvent(TickCount ticks);
 
-  /// Returns false if the DAC is loading any data from VRAM.
-  ALWAYS_INLINE bool IsDisplayDisabled() const
-  {
-    return m_GPUSTAT.display_disable || m_crtc_state.display_vram_width == 0 || m_crtc_state.display_vram_height == 0;
-  }
-
-  /// Returns true if scanout should be interlaced.
-  ALWAYS_INLINE bool IsInterlacedDisplayEnabled() const
-  {
-    return (!m_force_progressive_scan) & m_GPUSTAT.vertical_interlace;
-  }
-
-  /// Returns true if interlaced rendering is enabled and force progressive scan is disabled.
-  ALWAYS_INLINE bool IsInterlacedRenderingEnabled() const
-  {
-    return (!m_force_progressive_scan) & m_GPUSTAT.SkipDrawingToActiveField();
-  }
-
   /// Returns 0 if the currently-displayed field is on odd lines (1,3,5,...) or 1 if even (2,4,6,...).
   ALWAYS_INLINE u32 GetInterlacedDisplayField() const { return ZeroExtend32(m_crtc_state.interlaced_field); }
 

src/core/gpu_hw.cpp

@@ -134,6 +134,12 @@ void GPU_HW::UpdateResolutionScale()
     UpdateSettings();
 }
 
+std::tuple<u32, u32> GPU_HW::GetEffectiveDisplayResolution()
+{
+  return std::make_tuple(m_crtc_state.display_vram_width * m_resolution_scale,
+                         m_resolution_scale * m_crtc_state.display_vram_height);
+}
+
 void GPU_HW::PrintSettingsToLog()
 {
   Log_InfoPrintf("Resolution Scale: %u (%ux%u), maximum %u", m_resolution_scale, VRAM_WIDTH * m_resolution_scale,

src/core/gpu_hw.h

@@ -34,7 +34,9 @@ public:
   virtual bool Initialize(HostDisplay* host_display) override;
   virtual void Reset() override;
   virtual bool DoState(StateWrapper& sw) override;
-  virtual void UpdateResolutionScale() override;
+  
+  void UpdateResolutionScale() override final;
+  std::tuple<u32, u32> GetEffectiveDisplayResolution() override final;
 
 protected:
   enum : u32

src/core/host_interface.cpp

@@ -385,6 +385,7 @@ void HostInterface::SetDefaultSettings(SettingsInterface& si)
   si.SetBoolValue("Display", "ShowFPS", false);
   si.SetBoolValue("Display", "ShowVPS", false);
   si.SetBoolValue("Display", "ShowSpeed", false);
+  si.SetBoolValue("Display", "ShowResolution", false);
   si.SetBoolValue("Display", "Fullscreen", false);
   si.SetBoolValue("Display", "VSync", true);
 

src/core/settings.cpp

@@ -121,6 +121,7 @@ void Settings::Load(SettingsInterface& si)
   display_show_fps = si.GetBoolValue("Display", "ShowFPS", false);
   display_show_vps = si.GetBoolValue("Display", "ShowVPS", false);
   display_show_speed = si.GetBoolValue("Display", "ShowSpeed", false);
+  display_show_resolution = si.GetBoolValue("Display", "ShowResolution", false);
   video_sync_enabled = si.GetBoolValue("Display", "VSync", true);
 
   cdrom_read_thread = si.GetBoolValue("CDROM", "ReadThread", true);
@@ -223,6 +224,7 @@ void Settings::Save(SettingsInterface& si) const
   si.SetBoolValue("Display", "ShowFPS", display_show_fps);
   si.SetBoolValue("Display", "ShowVPS", display_show_vps);
   si.SetBoolValue("Display", "ShowSpeed", display_show_speed);
+  si.SetBoolValue("Display", "ShowResolution", display_show_speed);
   si.SetBoolValue("Display", "VSync", video_sync_enabled);
 
   si.SetBoolValue("CDROM", "ReadThread", cdrom_read_thread);

src/core/settings.h

@@ -101,6 +101,7 @@ struct Settings
   bool display_show_fps = false;
   bool display_show_vps = false;
   bool display_show_speed = false;
+  bool display_show_resolution = false;
   bool video_sync_enabled = true;
 
   bool cdrom_read_thread = true;

src/duckstation-qt/generalsettingswidget.cpp

@@ -21,6 +21,7 @@ GeneralSettingsWidget::GeneralSettingsWidget(QtHostInterface* host_interface, QW
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.showFPS, "Display", "ShowFPS", false);
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.showVPS, "Display", "ShowVPS", false);
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.showSpeed, "Display", "ShowSpeed", false);
+  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.showResolution, "Display", "ShowResolution", false);
 
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.enableSpeedLimiter, "Main", "SpeedLimiterEnabled",
                                                true);

src/duckstation-qt/generalsettingswidget.ui

@@ -173,6 +173,13 @@
         </property>
        </widget>
       </item>
+      <item row="4" column="0">
+       <widget class="QCheckBox" name="showResolution">
+        <property name="text">
+         <string>Show Resolution</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>

src/frontend-common/common_host_interface.cpp

@@ -723,11 +723,14 @@ void CommonHostInterface::DrawImGuiWindows()
 
 void CommonHostInterface::DrawFPSWindow()
 {
-  if (!(g_settings.display_show_fps | g_settings.display_show_vps | g_settings.display_show_speed))
+  if (!(g_settings.display_show_fps | g_settings.display_show_vps | g_settings.display_show_speed |
+        g_settings.display_show_resolution))
+  {
     return;
+  }
 
   const ImVec2 window_size =
-    ImVec2(175.0f * ImGui::GetIO().DisplayFramebufferScale.x, 16.0f * ImGui::GetIO().DisplayFramebufferScale.y);
+    ImVec2(175.0f * ImGui::GetIO().DisplayFramebufferScale.x, 48.0f * ImGui::GetIO().DisplayFramebufferScale.y);
   ImGui::SetNextWindowPos(ImVec2(ImGui::GetIO().DisplaySize.x - window_size.x, 0.0f), ImGuiCond_Always);
   ImGui::SetNextWindowSize(window_size);
 
@@ -784,6 +787,13 @@ void CommonHostInterface::DrawFPSWindow()
       ImGui::TextColored(ImVec4(0.4f, 1.0f, 0.4f, 1.0f), "%u%%", rounded_speed);
   }
 
+  if (g_settings.display_show_resolution)
+  {
+    const auto [effective_width, effective_height] = g_gpu->GetEffectiveDisplayResolution();
+    const bool interlaced = g_gpu->IsInterlacedDisplayEnabled();
+    ImGui::Text("%ux%u (%s)", effective_width, effective_height, interlaced ? "interlaced" : "progressive");
+  }
+
   ImGui::End();
 }
 
@@ -1297,8 +1307,8 @@ void CommonHostInterface::RegisterGraphicsHotkeys()
                      ToggleSoftwareRendering();
                  });
 
-  RegisterHotkey(StaticString("Graphics"), StaticString("TogglePGXP"), StaticString("Toggle PGXP"),
-                 [this](bool pressed) {
+  RegisterHotkey(
+    StaticString("Graphics"), StaticString("TogglePGXP"), StaticString("Toggle PGXP"), [this](bool pressed) {
       if (!pressed)
       {
         g_settings.gpu_pgxp_enable = !g_settings.gpu_pgxp_enable;