System: Add option to automatically resize window

src/core/fullscreen_ui.cpp

@@ -4431,6 +4431,10 @@ void FullscreenUI::DrawDisplaySettingsPage()
     FSUI_CSTR("Stretches the display to match the aspect ratio by multiplying vertically instead of horizontally."),
     "Display", "StretchVertically", false);
 
+  DrawToggleSetting(bsi, FSUI_CSTR("Automatically Resize Window"),
+                    FSUI_CSTR("Automatically resizes the window to match the internal resolution."), "Display",
+                    "AutoResizeWindow", false);
+
   DrawToggleSetting(
     bsi, FSUI_CSTR("Disable Mailbox Presentation"),
     FSUI_CSTR("Forces the use of FIFO over Mailbox presentation, i.e. double buffering instead of triple buffering. "
@@ -7229,8 +7233,10 @@ TRANSLATE_NOOP("FullscreenUI", "Automatic based on window size");
 TRANSLATE_NOOP("FullscreenUI", "Automatic mapping completed for {}.");
 TRANSLATE_NOOP("FullscreenUI", "Automatic mapping failed for {}.");
 TRANSLATE_NOOP("FullscreenUI", "Automatic mapping failed, no devices are available.");
+TRANSLATE_NOOP("FullscreenUI", "Automatically Resize Window");
 TRANSLATE_NOOP("FullscreenUI", "Automatically applies patches to disc images when they are present, currently only PPF is supported.");
 TRANSLATE_NOOP("FullscreenUI", "Automatically loads and applies cheats on game start. Cheats can break games and saves.");
+TRANSLATE_NOOP("FullscreenUI", "Automatically resizes the window to match the internal resolution.");
 TRANSLATE_NOOP("FullscreenUI", "Automatically saves the emulator state when powering down or exiting. You can then resume directly from where you left off next time.");
 TRANSLATE_NOOP("FullscreenUI", "Automatically switches to fullscreen mode when the program is started.");
 TRANSLATE_NOOP("FullscreenUI", "Avoids calls to C++ code, significantly speeding up the recompiler.");

src/core/gpu.cpp

@@ -1985,6 +1985,13 @@ void GPU::SetDisplayTexture(GPUTexture* texture, GPUTexture* depth_buffer, s32 v
                             s32 view_height)
 {
   DebugAssert(texture);
+
+  if (g_settings.display_auto_resize_window &&
+      (view_width != m_display_texture_view_width || view_height != m_display_texture_view_height))
+  {
+    System::RequestDisplaySize();
+  }
+
   m_display_texture = texture;
   m_display_depth_buffer = depth_buffer;
   m_display_texture_view_x = view_x;

src/core/settings.cpp

@@ -317,6 +317,7 @@ void Settings::Load(SettingsInterface& si, SettingsInterface& controller_si)
   display_show_inputs = si.GetBoolValue("Display", "ShowInputs", false);
   display_show_enhancements = si.GetBoolValue("Display", "ShowEnhancements", false);
   display_stretch_vertically = si.GetBoolValue("Display", "StretchVertically", false);
+  display_auto_resize_window = si.GetBoolValue("Display", "AutoResizeWindow", false);
   display_osd_scale = si.GetFloatValue("Display", "OSDScale", DEFAULT_OSD_SCALE);
 
   save_state_compression = ParseSaveStateCompressionModeName(
@@ -591,6 +592,7 @@ void Settings::Save(SettingsInterface& si, bool ignore_base) const
   }
 
   si.SetBoolValue("Display", "StretchVertically", display_stretch_vertically);
+  si.SetBoolValue("Display", "AutoResizeWindow", display_auto_resize_window);
 
   si.SetIntValue("CDROM", "ReadaheadSectors", cdrom_readahead_sectors);
   si.SetStringValue("CDROM", "MechaconVersion", GetCDROMMechVersionName(cdrom_mechacon_version));

src/core/settings.h

@@ -172,6 +172,7 @@ struct Settings
   bool display_show_inputs : 1 = false;
   bool display_show_enhancements : 1 = false;
   bool display_stretch_vertically : 1 = false;
+  bool display_auto_resize_window : 1 = false;
   float display_pre_frame_sleep_buffer = DEFAULT_DISPLAY_PRE_FRAME_SLEEP_BUFFER;
   float display_osd_scale = 100.0f;
   float gpu_pgxp_tolerance = -1.0f;