Implementation of screen rotation without use of additional layouts.

This is based on what was done using additional layouts, but modified
to have a variable to control rotation and making it so Single Screen
Layout behaves like Upright Single would, and Default Layout behaves
like Upright Double would, when the new variable is used.

Large Layout and Side Layout currently ignore the new variable.
New variable still currently doesn't have a hotkey.

src/citra/config.cpp

@@ -151,6 +151,7 @@ void Config::ReadValues() {
     Settings::values.layout_option =
         static_cast<Settings::LayoutOption>(sdl2_config->GetInteger("Layout", "layout_option", 0));
     Settings::values.swap_screen = sdl2_config->GetBoolean("Layout", "swap_screen", false);
+    Settings::values.upright_screen = sdl2_config->GetBoolean("Layout", "upright_screen", false);
     Settings::values.custom_layout = sdl2_config->GetBoolean("Layout", "custom_layout", false);
     Settings::values.custom_top_left =
         static_cast<u16>(sdl2_config->GetInteger("Layout", "custom_top_left", 0));

src/citra/default_ini.h

@@ -183,6 +183,10 @@ custom_bottom_bottom =
 # 0 (default): Top Screen is prominent, 1: Bottom Screen is prominent
 swap_screen =
 
+# Toggle upright orientation, for book style games.
+# 0 (default): Off, 1: On
+upright_screen =
+
 # Dumps textures as PNG to dump/textures/[Title ID]/.
 # 0 (default): Off, 1: On
 dump_textures =

src/citra_qt/configuration/config.cpp

@@ -296,6 +296,7 @@ void Config::ReadLayoutValues() {
     Settings::values.layout_option =
         static_cast<Settings::LayoutOption>(ReadSetting(QStringLiteral("layout_option")).toInt());
     Settings::values.swap_screen = ReadSetting(QStringLiteral("swap_screen"), false).toBool();
+    Settings::values.upright_screen = ReadSetting(QStringLiteral("upright_screen"), false).toBool();
     Settings::values.custom_layout = ReadSetting(QStringLiteral("custom_layout"), false).toBool();
     Settings::values.custom_top_left = ReadSetting(QStringLiteral("custom_top_left"), 0).toInt();
     Settings::values.custom_top_top = ReadSetting(QStringLiteral("custom_top_top"), 0).toInt();
@@ -765,6 +766,7 @@ void Config::SaveLayoutValues() {
     WriteSetting(QStringLiteral("filter_mode"), Settings::values.filter_mode, true);
     WriteSetting(QStringLiteral("layout_option"), static_cast<int>(Settings::values.layout_option));
     WriteSetting(QStringLiteral("swap_screen"), Settings::values.swap_screen, false);
+    WriteSetting(QStringLiteral("upright_screen"), Settings::values.upright_screen, false);
     WriteSetting(QStringLiteral("custom_layout"), Settings::values.custom_layout, false);
     WriteSetting(QStringLiteral("custom_top_left"), Settings::values.custom_top_left, 0);
     WriteSetting(QStringLiteral("custom_top_top"), Settings::values.custom_top_top, 0);

src/citra_qt/configuration/configure_enhancements.cpp

@@ -53,6 +53,7 @@ void ConfigureEnhancements::SetConfiguration() {
     ui->layout_combobox->setCurrentIndex(static_cast<int>(Settings::values.layout_option));
     ui->swap_screen->setChecked(Settings::values.swap_screen);
     ui->toggle_disk_shader_cache->setChecked(Settings::values.use_disk_shader_cache);
+    ui->upright_screen->setChecked(Settings::values.upright_screen);
     ui->toggle_dump_textures->setChecked(Settings::values.dump_textures);
     ui->toggle_custom_textures->setChecked(Settings::values.custom_textures);
     ui->toggle_preload_textures->setChecked(Settings::values.preload_textures);
@@ -101,6 +102,7 @@ void ConfigureEnhancements::ApplyConfiguration() {
         static_cast<Settings::LayoutOption>(ui->layout_combobox->currentIndex());
     Settings::values.swap_screen = ui->swap_screen->isChecked();
     Settings::values.use_disk_shader_cache = ui->toggle_disk_shader_cache->isChecked();
+    Settings::values.upright_screen = ui->upright_screen->isChecked();
     Settings::values.dump_textures = ui->toggle_dump_textures->isChecked();
     Settings::values.custom_textures = ui->toggle_custom_textures->isChecked();
     Settings::values.preload_textures = ui->toggle_preload_textures->isChecked();

src/citra_qt/configuration/configure_enhancements.ui

@@ -239,6 +239,13 @@
         </property>
        </widget>
       </item>
+      <item>
+       <widget class="QCheckBox" name="upright_screen">
+        <property name="text">
+         <string>Rotate Screens Upright</string>
+        </property>
+       </widget>
+      </item>
       <item>
        <layout class="QHBoxLayout" name="horizontalLayout_6">
         <item>

src/citra_qt/main.cpp

@@ -618,6 +618,8 @@ void GMainWindow::ConnectMenuEvents() {
             &GMainWindow::ChangeScreenLayout);
     connect(ui.action_Screen_Layout_Swap_Screens, &QAction::triggered, this,
             &GMainWindow::OnSwapScreens);
+    connect(ui.action_Screen_Layout_Upright_Screens, &QAction::triggered, this,
+            &GMainWindow::OnRotateScreens);
 
     // Movie
     connect(ui.action_Record_Movie, &QAction::triggered, this, &GMainWindow::OnRecordMovie);
@@ -1435,6 +1437,11 @@ void GMainWindow::OnSwapScreens() {
     Settings::Apply();
 }
 
+void GMainWindow::OnRotateScreens() {
+    Settings::values.upright_screen = ui.action_Screen_Layout_Upright_Screens->isChecked();
+    Settings::Apply();
+}
+
 void GMainWindow::OnCheats() {
     CheatDialog cheat_dialog(this);
     cheat_dialog.exec();
@@ -2032,6 +2039,7 @@ void GMainWindow::SyncMenuUISettings() {
     ui.action_Screen_Layout_Side_by_Side->setChecked(Settings::values.layout_option ==
                                                      Settings::LayoutOption::SideScreen);
     ui.action_Screen_Layout_Swap_Screens->setChecked(Settings::values.swap_screen);
+    ui.action_Screen_Layout_Upright_Screens->setChecked(Settings::values.upright_screen);
 }
 
 void GMainWindow::RetranslateStatusBar() {

src/citra_qt/main.h

@@ -187,6 +187,7 @@ private slots:
     void ChangeScreenLayout();
     void ToggleScreenLayout();
     void OnSwapScreens();
+    void OnRotateScreens();
     void OnCheats();
     void ShowFullscreen();
     void HideFullscreen();

src/citra_qt/main.ui

@@ -110,6 +110,7 @@
      <addaction name="action_Screen_Layout_Side_by_Side"/>
      <addaction name="separator"/>
      <addaction name="action_Screen_Layout_Swap_Screens"/>
+     <addaction name="action_Screen_Layout_Upright_Screens"/>
     </widget>
     <addaction name="action_Fullscreen"/>
     <addaction name="action_Single_Window_Mode"/>
@@ -425,6 +426,14 @@
     <string>Swap Screens</string>
    </property>
   </action>
+  <action name="action_Screen_Layout_Upright_Screens">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Rotate Upright</string>
+   </property>
+  </action>
   <action name="action_Check_For_Updates">
    <property name="text">
     <string>Check for Updates</string>

src/core/frontend/emu_window.cpp

@@ -118,6 +118,11 @@ void EmuWindow::TouchPressed(unsigned framebuffer_x, unsigned framebuffer_y) {
         static_cast<float>(framebuffer_y - framebuffer_layout.bottom_screen.top) /
         (framebuffer_layout.bottom_screen.bottom - framebuffer_layout.bottom_screen.top);
 
+    if (!framebuffer_layout.is_rotated) {
+        std::swap(touch_state->touch_x, touch_state->touch_y);
+        touch_state->touch_x = 1.f - touch_state->touch_x;
+    }
+
     touch_state->touch_pressed = true;
 }
 
@@ -145,17 +150,21 @@ void EmuWindow::UpdateCurrentFramebufferLayout(unsigned width, unsigned height)
     } else {
         switch (Settings::values.layout_option) {
         case Settings::LayoutOption::SingleScreen:
-            layout = Layout::SingleFrameLayout(width, height, Settings::values.swap_screen);
+            layout = Layout::SingleFrameLayout(width, height, Settings::values.swap_screen,
+                                               Settings::values.upright_screen);
             break;
         case Settings::LayoutOption::LargeScreen:
-            layout = Layout::LargeFrameLayout(width, height, Settings::values.swap_screen);
+            layout = Layout::LargeFrameLayout(width, height, Settings::values.swap_screen,
+                                              Settings::values.upright_screen);
             break;
         case Settings::LayoutOption::SideScreen:
-            layout = Layout::SideFrameLayout(width, height, Settings::values.swap_screen);
+            layout = Layout::SideFrameLayout(width, height, Settings::values.swap_screen,
+                                             Settings::values.upright_screen);
             break;
         case Settings::LayoutOption::Default:
         default:
-            layout = Layout::DefaultFrameLayout(width, height, Settings::values.swap_screen);
+            layout = Layout::DefaultFrameLayout(width, height, Settings::values.swap_screen,
+                                                Settings::values.upright_screen);
             break;
         }
     }

src/core/frontend/framebuffer_layout.cpp

@@ -15,9 +15,17 @@ static const float TOP_SCREEN_ASPECT_RATIO =
     static_cast<float>(Core::kScreenTopHeight) / Core::kScreenTopWidth;
 static const float BOT_SCREEN_ASPECT_RATIO =
     static_cast<float>(Core::kScreenBottomHeight) / Core::kScreenBottomWidth;
+static const float TOP_SCREEN_UPRIGHT_ASPECT_RATIO =
+    static_cast<float>(Core::kScreenTopWidth) / Core::kScreenTopHeight;
+static const float BOT_SCREEN_UPRIGHT_ASPECT_RATIO =
+    static_cast<float>(Core::kScreenBottomWidth) / Core::kScreenBottomHeight;
 
 u32 FramebufferLayout::GetScalingRatio() const {
+    if (is_rotated) {
         return static_cast<u32>(((top_screen.GetWidth() - 1) / Core::kScreenTopWidth) + 1);
+    } else {
+        return static_cast<u32>(((top_screen.GetWidth() - 1) / Core::kScreenTopHeight) + 1);
+    }
 }
 
 // Finds the largest size subrectangle contained in window area that is confined to the aspect ratio
@@ -30,29 +38,63 @@ static Common::Rectangle<T> maxRectangle(Common::Rectangle<T> window_area,
                                 static_cast<T>(std::round(scale * screen_aspect_ratio))};
 }
 
-FramebufferLayout DefaultFrameLayout(u32 width, u32 height, bool swapped) {
+FramebufferLayout DefaultFrameLayout(u32 width, u32 height, bool swapped, bool upright) {
     ASSERT(width > 0);
     ASSERT(height > 0);
 
-    FramebufferLayout res{width, height, true, true, {}, {}};
+    FramebufferLayout res{width, height, true, true, {}, {}, !upright};
+    Common::Rectangle<u32> screen_window_area;
+    Common::Rectangle<u32> top_screen;
+    Common::Rectangle<u32> bot_screen;
+    float emulation_aspect_ratio;
+    if (upright) {
         // Default layout gives equal screen sizes to the top and bottom screen
-    Common::Rectangle<u32> screen_window_area{0, 0, width, height / 2};
+        screen_window_area = {0, 0, width / 2, height};
-    Common::Rectangle<u32> top_screen = maxRectangle(screen_window_area, TOP_SCREEN_ASPECT_RATIO);
+        top_screen = maxRectangle(screen_window_area, TOP_SCREEN_UPRIGHT_ASPECT_RATIO);
-    Common::Rectangle<u32> bot_screen = maxRectangle(screen_window_area, BOT_SCREEN_ASPECT_RATIO);
+        bot_screen = maxRectangle(screen_window_area, BOT_SCREEN_UPRIGHT_ASPECT_RATIO);
+        // both screens width are taken into account by dividing by 2
+        emulation_aspect_ratio = TOP_SCREEN_UPRIGHT_ASPECT_RATIO / 2;
+    } else {
+        // Default layout gives equal screen sizes to the top and bottom screen
+        screen_window_area = {0, 0, width, height / 2};
+        top_screen = maxRectangle(screen_window_area, TOP_SCREEN_ASPECT_RATIO);
+        bot_screen = maxRectangle(screen_window_area, BOT_SCREEN_ASPECT_RATIO);
+        // both screens height are taken into account by multiplying by 2
+        emulation_aspect_ratio = TOP_SCREEN_ASPECT_RATIO * 2;
+    }
 
     float window_aspect_ratio = static_cast<float>(height) / width;
-    // both screens height are taken into account by multiplying by 2
-    float emulation_aspect_ratio = TOP_SCREEN_ASPECT_RATIO * 2;
 
     if (window_aspect_ratio < emulation_aspect_ratio) {
-        // Apply borders to the left and right sides of the window.
+        // Window is wider than the emulation content => apply borders to the right and left sides
+        if (upright) {
+            // Recalculate the bottom screen to account for the height difference between right and
+            // left
+            screen_window_area = {0, 0, top_screen.GetWidth(), height};
+            bot_screen = maxRectangle(screen_window_area, BOT_SCREEN_UPRIGHT_ASPECT_RATIO);
+            bot_screen =
+                bot_screen.TranslateY((top_screen.GetHeight() - bot_screen.GetHeight()) / 2);
+            if (swapped) {
+                bot_screen = bot_screen.TranslateX(width / 2 - bot_screen.GetWidth());
+            } else {
+                top_screen = top_screen.TranslateX(width / 2 - top_screen.GetWidth());
+            }
+        } else {
             top_screen =
                 top_screen.TranslateX((screen_window_area.GetWidth() - top_screen.GetWidth()) / 2);
             bot_screen =
                 bot_screen.TranslateX((screen_window_area.GetWidth() - bot_screen.GetWidth()) / 2);
+        }
     } else {
         // Window is narrower than the emulation content => apply borders to the top and bottom
-        // Recalculate the bottom screen to account for the width difference between top and bottom
+        if (upright) {
+            top_screen = top_screen.TranslateY(
+                (screen_window_area.GetHeight() - top_screen.GetHeight()) / 2);
+            bot_screen = bot_screen.TranslateY(
+                (screen_window_area.GetHeight() - bot_screen.GetHeight()) / 2);
+        } else {
+            // Recalculate the bottom screen to account for the width difference between top and
+            // bottom
             screen_window_area = {0, 0, width, top_screen.GetHeight()};
             bot_screen = maxRectangle(screen_window_area, BOT_SCREEN_ASPECT_RATIO);
             bot_screen = bot_screen.TranslateX((top_screen.GetWidth() - bot_screen.GetWidth()) / 2);
@@ -62,25 +104,42 @@ FramebufferLayout DefaultFrameLayout(u32 width, u32 height, bool swapped) {
                 top_screen = top_screen.TranslateY(height / 2 - top_screen.GetHeight());
             }
         }
+    }
+    if (upright) {
+        // Move the top screen to the right if we are swapped.
+        res.top_screen = swapped ? top_screen.TranslateX(width / 2) : top_screen;
+        res.bottom_screen = swapped ? bot_screen : bot_screen.TranslateX(width / 2);
+    } else {
         // Move the top screen to the bottom if we are swapped.
         res.top_screen = swapped ? top_screen.TranslateY(height / 2) : top_screen;
         res.bottom_screen = swapped ? bot_screen : bot_screen.TranslateY(height / 2);
+    }
     return res;
 }
 
-FramebufferLayout SingleFrameLayout(u32 width, u32 height, bool swapped) {
+FramebufferLayout SingleFrameLayout(u32 width, u32 height, bool swapped, bool upright) {
     ASSERT(width > 0);
     ASSERT(height > 0);
     // The drawing code needs at least somewhat valid values for both screens
     // so just calculate them both even if the other isn't showing.
-    FramebufferLayout res{width, height, !swapped, swapped, {}, {}};
+    FramebufferLayout res{width, height, !swapped, swapped, {}, {}, !upright};
 
     Common::Rectangle<u32> screen_window_area{0, 0, width, height};
-    Common::Rectangle<u32> top_screen = maxRectangle(screen_window_area, TOP_SCREEN_ASPECT_RATIO);
+    Common::Rectangle<u32> top_screen;
-    Common::Rectangle<u32> bot_screen = maxRectangle(screen_window_area, BOT_SCREEN_ASPECT_RATIO);
+    Common::Rectangle<u32> bot_screen;
+    float emulation_aspect_ratio;
+    if (upright) {
+        top_screen = maxRectangle(screen_window_area, TOP_SCREEN_UPRIGHT_ASPECT_RATIO);
+        bot_screen = maxRectangle(screen_window_area, BOT_SCREEN_UPRIGHT_ASPECT_RATIO);
+        emulation_aspect_ratio =
+            (swapped) ? BOT_SCREEN_UPRIGHT_ASPECT_RATIO : TOP_SCREEN_UPRIGHT_ASPECT_RATIO;
+    } else {
+        top_screen = maxRectangle(screen_window_area, TOP_SCREEN_ASPECT_RATIO);
+        bot_screen = maxRectangle(screen_window_area, BOT_SCREEN_ASPECT_RATIO);
+        emulation_aspect_ratio = (swapped) ? BOT_SCREEN_ASPECT_RATIO : TOP_SCREEN_ASPECT_RATIO;
+    }
 
     float window_aspect_ratio = static_cast<float>(height) / width;
-    float emulation_aspect_ratio = (swapped) ? BOT_SCREEN_ASPECT_RATIO : TOP_SCREEN_ASPECT_RATIO;
 
     if (window_aspect_ratio < emulation_aspect_ratio) {
         top_screen =
@@ -96,11 +155,11 @@ FramebufferLayout SingleFrameLayout(u32 width, u32 height, bool swapped) {
     return res;
 }
 
-FramebufferLayout LargeFrameLayout(u32 width, u32 height, bool swapped) {
+FramebufferLayout LargeFrameLayout(u32 width, u32 height, bool swapped, bool upright) {
     ASSERT(width > 0);
     ASSERT(height > 0);
 
-    FramebufferLayout res{width, height, true, true, {}, {}};
+    FramebufferLayout res{width, height, true, true, {}, {}, true};
     // Split the window into two parts. Give 4x width to the main screen and 1x width to the small
     // To do that, find the total emulation box and maximize that based on window size
     float window_aspect_ratio = static_cast<float>(height) / width;
@@ -133,11 +192,11 @@ FramebufferLayout LargeFrameLayout(u32 width, u32 height, bool swapped) {
     return res;
 }
 
-FramebufferLayout SideFrameLayout(u32 width, u32 height, bool swapped) {
+FramebufferLayout SideFrameLayout(u32 width, u32 height, bool swapped, bool upright) {
     ASSERT(width > 0);
     ASSERT(height > 0);
 
-    FramebufferLayout res{width, height, true, true, {}, {}};
+    FramebufferLayout res{width, height, true, true, {}, {}, true};
     // Aspect ratio of both screens side by side
     const float emulation_aspect_ratio = static_cast<float>(Core::kScreenTopHeight) /
                                          (Core::kScreenTopWidth + Core::kScreenBottomWidth);
@@ -170,7 +229,7 @@ FramebufferLayout CustomFrameLayout(u32 width, u32 height) {
     ASSERT(width > 0);
     ASSERT(height > 0);
 
-    FramebufferLayout res{width, height, true, true, {}, {}};
+    FramebufferLayout res{width, height, true, true, {}, {}, !Settings::values.upright_screen};
 
     Common::Rectangle<u32> top_screen{
         Settings::values.custom_top_left, Settings::values.custom_top_top,
@@ -194,6 +253,15 @@ FramebufferLayout FrameLayoutFromResolutionScale(u32 res_scale) {
         int width, height;
         switch (Settings::values.layout_option) {
         case Settings::LayoutOption::SingleScreen:
+            if (Settings::values.upright_screen) {
+                if (Settings::values.swap_screen) {
+                    width = Core::kScreenBottomHeight * res_scale;
+                    height = Core::kScreenBottomWidth * res_scale;
+                } else {
+                    width = Core::kScreenTopHeight * res_scale;
+                    height = Core::kScreenTopWidth * res_scale;
+                }
+            } else {
                 if (Settings::values.swap_screen) {
                     width = Core::kScreenBottomWidth * res_scale;
                     height = Core::kScreenBottomHeight * res_scale;
@@ -201,7 +269,9 @@ FramebufferLayout FrameLayoutFromResolutionScale(u32 res_scale) {
                     width = Core::kScreenTopWidth * res_scale;
                     height = Core::kScreenTopHeight * res_scale;
                 }
-            layout = SingleFrameLayout(width, height, Settings::values.swap_screen);
+            }
+            layout = SingleFrameLayout(width, height, Settings::values.swap_screen,
+                                       Settings::values.upright_screen);
             break;
         case Settings::LayoutOption::LargeScreen:
             if (Settings::values.swap_screen) {
@@ -211,18 +281,26 @@ FramebufferLayout FrameLayoutFromResolutionScale(u32 res_scale) {
                 width = (Core::kScreenTopWidth + Core::kScreenBottomWidth / 4) * res_scale;
                 height = Core::kScreenTopHeight * res_scale;
             }
-            layout = LargeFrameLayout(width, height, Settings::values.swap_screen);
+            layout = LargeFrameLayout(width, height, Settings::values.swap_screen,
+                                      Settings::values.upright_screen);
             break;
         case Settings::LayoutOption::SideScreen:
             width = (Core::kScreenTopWidth + Core::kScreenBottomWidth) * res_scale;
             height = Core::kScreenTopHeight * res_scale;
-            layout = SideFrameLayout(width, height, Settings::values.swap_screen);
+            layout = SideFrameLayout(width, height, Settings::values.swap_screen,
+                                     Settings::values.upright_screen);
             break;
         case Settings::LayoutOption::Default:
         default:
+            if (Settings::values.upright_screen) {
+                width = (Core::kScreenTopHeight + Core::kScreenBottomHeight) * res_scale;
+                height = Core::kScreenTopWidth * res_scale;
+            } else {
                 width = Core::kScreenTopWidth * res_scale;
                 height = (Core::kScreenTopHeight + Core::kScreenBottomHeight) * res_scale;
-            layout = DefaultFrameLayout(width, height, Settings::values.swap_screen);
+            }
+            layout = DefaultFrameLayout(width, height, Settings::values.swap_screen,
+                                        Settings::values.upright_screen);
             break;
         }
     }

src/core/frontend/framebuffer_layout.h

@@ -16,6 +16,7 @@ struct FramebufferLayout {
     bool bottom_screen_enabled;
     Common::Rectangle<u32> top_screen;
     Common::Rectangle<u32> bottom_screen;
+    bool is_rotated = true;
 
     /**
      * Returns the ration of pixel size of the top screen, compared to the native size of the 3DS
@@ -31,7 +32,7 @@ struct FramebufferLayout {
  * @param is_swapped if true, the bottom screen will be displayed above the top screen
  * @return Newly created FramebufferLayout object with default screen regions initialized
  */
-FramebufferLayout DefaultFrameLayout(u32 width, u32 height, bool is_swapped);
+FramebufferLayout DefaultFrameLayout(u32 width, u32 height, bool is_swapped, bool upright);
 
 /**
  * Factory method for constructing a FramebufferLayout with only the top or bottom screen
@@ -40,7 +41,7 @@ FramebufferLayout DefaultFrameLayout(u32 width, u32 height, bool is_swapped);
  * @param is_swapped if true, the bottom screen will be displayed (and the top won't be displayed)
  * @return Newly created FramebufferLayout object with default screen regions initialized
  */
-FramebufferLayout SingleFrameLayout(u32 width, u32 height, bool is_swapped);
+FramebufferLayout SingleFrameLayout(u32 width, u32 height, bool is_swapped, bool upright);
 
 /**
  * Factory method for constructing a Frame with the a 4x size Top screen with a 1x size bottom
@@ -51,7 +52,7 @@ FramebufferLayout SingleFrameLayout(u32 width, u32 height, bool is_swapped);
  * @param is_swapped if true, the bottom screen will be the large display
  * @return Newly created FramebufferLayout object with default screen regions initialized
  */
-FramebufferLayout LargeFrameLayout(u32 width, u32 height, bool is_swapped);
+FramebufferLayout LargeFrameLayout(u32 width, u32 height, bool is_swapped, bool upright);
 
 /**
  * Factory method for constructing a Frame with the Top screen and bottom
@@ -62,7 +63,7 @@ FramebufferLayout LargeFrameLayout(u32 width, u32 height, bool is_swapped);
  * @param is_swapped if true, the bottom screen will be the left display
  * @return Newly created FramebufferLayout object with default screen regions initialized
  */
-FramebufferLayout SideFrameLayout(u32 width, u32 height, bool is_swapped);
+FramebufferLayout SideFrameLayout(u32 width, u32 height, bool is_swapped, bool upright);
 
 /**
  * Factory method for constructing a custom FramebufferLayout

src/core/settings.h

@@ -150,6 +150,7 @@ struct Values {
 
     LayoutOption layout_option;
     bool swap_screen;
+    bool upright_screen;
     bool custom_layout;
     u16 custom_top_left;
     u16 custom_top_top;

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -781,6 +781,35 @@ void RendererOpenGL::DrawSingleScreenRotated(const ScreenInfo& screen_info, floa
     state.Apply();
 }
 
+void RendererOpenGL::DrawSingleScreen(const ScreenInfo& screen_info, float x, float y, float w,
+                                      float h) {
+    const auto& texcoords = screen_info.display_texcoords;
+
+    const std::array<ScreenRectVertex, 4> vertices = {{
+        ScreenRectVertex(x, y, texcoords.bottom, texcoords.right),
+        ScreenRectVertex(x + w, y, texcoords.top, texcoords.right),
+        ScreenRectVertex(x, y + h, texcoords.bottom, texcoords.left),
+        ScreenRectVertex(x + w, y + h, texcoords.top, texcoords.left),
+    }};
+
+    u16 scale_factor = VideoCore::GetResolutionScaleFactor();
+    glUniform4f(uniform_i_resolution, screen_info.texture.width * scale_factor,
+                screen_info.texture.height * scale_factor,
+                1.0 / (screen_info.texture.width * scale_factor),
+                1.0 / (screen_info.texture.height * scale_factor));
+    glUniform4f(uniform_o_resolution, w, h, 1.0f / w, 1.0f / h);
+    state.texture_units[0].texture_2d = screen_info.display_texture;
+    state.texture_units[0].sampler = filter_sampler.handle;
+    state.Apply();
+
+    glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices.data());
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+    state.texture_units[0].texture_2d = 0;
+    state.texture_units[0].sampler = 0;
+    state.Apply();
+}
+
 /**
  * Draws a single texture to the emulator window, rotating the texture to correct for the 3DS's LCD
  * rotation.
@@ -819,6 +848,40 @@ void RendererOpenGL::DrawSingleScreenStereoRotated(const ScreenInfo& screen_info
     state.Apply();
 }
 
+void RendererOpenGL::DrawSingleScreenStereo(const ScreenInfo& screen_info_l,
+                                            const ScreenInfo& screen_info_r, float x, float y,
+                                            float w, float h) {
+    const auto& texcoords = screen_info_l.display_texcoords;
+
+    const std::array<ScreenRectVertex, 4> vertices = {{
+        ScreenRectVertex(x, y, texcoords.bottom, texcoords.right),
+        ScreenRectVertex(x + w, y, texcoords.top, texcoords.right),
+        ScreenRectVertex(x, y + h, texcoords.bottom, texcoords.left),
+        ScreenRectVertex(x + w, y + h, texcoords.top, texcoords.left),
+    }};
+
+    u16 scale_factor = VideoCore::GetResolutionScaleFactor();
+    glUniform4f(uniform_i_resolution, screen_info_l.texture.width * scale_factor,
+                screen_info_l.texture.height * scale_factor,
+                1.0 / (screen_info_l.texture.width * scale_factor),
+                1.0 / (screen_info_l.texture.height * scale_factor));
+    glUniform4f(uniform_o_resolution, w, h, 1.0f / w, 1.0f / h);
+    state.texture_units[0].texture_2d = screen_info_l.display_texture;
+    state.texture_units[1].texture_2d = screen_info_r.display_texture;
+    state.texture_units[0].sampler = filter_sampler.handle;
+    state.texture_units[1].sampler = filter_sampler.handle;
+    state.Apply();
+
+    glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices.data());
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+    state.texture_units[0].texture_2d = 0;
+    state.texture_units[1].texture_2d = 0;
+    state.texture_units[0].sampler = 0;
+    state.texture_units[1].sampler = 0;
+    state.Apply();
+}
+
 /**
  * Draws the emulated screens to the emulator window.
  */
@@ -866,9 +929,11 @@ void RendererOpenGL::DrawScreens(const Layout::FramebufferLayout& layout) {
 
     glUniform1i(uniform_layer, 0);
     if (layout.top_screen_enabled) {
+        if (layout.is_rotated) {
             if (Settings::values.render_3d == Settings::StereoRenderOption::Off) {
-            DrawSingleScreenRotated(screen_infos[0], (float)top_screen.left, (float)top_screen.top,
+                DrawSingleScreenRotated(screen_infos[0], (float)top_screen.left,
-                                    (float)top_screen.GetWidth(), (float)top_screen.GetHeight());
+                                        (float)top_screen.top, (float)top_screen.GetWidth(),
+                                        (float)top_screen.GetHeight());
             } else if (Settings::values.render_3d == Settings::StereoRenderOption::SideBySide) {
                 DrawSingleScreenRotated(screen_infos[0], (float)top_screen.left / 2,
                                         (float)top_screen.top, (float)top_screen.GetWidth() / 2,
@@ -879,24 +944,43 @@ void RendererOpenGL::DrawScreens(const Layout::FramebufferLayout& layout) {
                                         (float)top_screen.top, (float)top_screen.GetWidth() / 2,
                                         (float)top_screen.GetHeight());
             } else if (stereo_single_screen) {
-            DrawSingleScreenStereoRotated(screen_infos[0], screen_infos[1], (float)top_screen.left,
+                DrawSingleScreenStereoRotated(
+                    screen_infos[0], screen_infos[1], (float)top_screen.left, (float)top_screen.top,
+                    (float)top_screen.GetWidth(), (float)top_screen.GetHeight());
+            }
+        } else {
+            if (Settings::values.render_3d == Settings::StereoRenderOption::Off) {
+                DrawSingleScreen(screen_infos[0], (float)top_screen.left, (float)top_screen.top,
+                                 (float)top_screen.GetWidth(), (float)top_screen.GetHeight());
+            } else if (Settings::values.render_3d == Settings::StereoRenderOption::SideBySide) {
+                DrawSingleScreen(screen_infos[0], (float)top_screen.left / 2, (float)top_screen.top,
+                                 (float)top_screen.GetWidth() / 2, (float)top_screen.GetHeight());
+                glUniform1i(uniform_layer, 1);
+                DrawSingleScreen(screen_infos[1],
+                                 ((float)top_screen.left / 2) + ((float)layout.width / 2),
+                                 (float)top_screen.top, (float)top_screen.GetWidth() / 2,
+                                 (float)top_screen.GetHeight());
+            } else if (stereo_single_screen) {
+                DrawSingleScreenStereo(screen_infos[0], screen_infos[1], (float)top_screen.left,
                                        (float)top_screen.top, (float)top_screen.GetWidth(),
                                        (float)top_screen.GetHeight());
             }
         }
+    }
     glUniform1i(uniform_layer, 0);
     if (layout.bottom_screen_enabled) {
+        if (layout.is_rotated) {
             if (Settings::values.render_3d == Settings::StereoRenderOption::Off) {
                 DrawSingleScreenRotated(screen_infos[2], (float)bottom_screen.left,
                                         (float)bottom_screen.top, (float)bottom_screen.GetWidth(),
                                         (float)bottom_screen.GetHeight());
             } else if (Settings::values.render_3d == Settings::StereoRenderOption::SideBySide) {
-            DrawSingleScreenRotated(screen_infos[2], (float)bottom_screen.left / 2,
+                DrawSingleScreenRotated(
-                                    (float)bottom_screen.top, (float)bottom_screen.GetWidth() / 2,
+                    screen_infos[2], (float)bottom_screen.left / 2, (float)bottom_screen.top,
-                                    (float)bottom_screen.GetHeight());
+                    (float)bottom_screen.GetWidth() / 2, (float)bottom_screen.GetHeight());
                 glUniform1i(uniform_layer, 1);
-            DrawSingleScreenRotated(screen_infos[2],
+                DrawSingleScreenRotated(
-                                    ((float)bottom_screen.left / 2) + ((float)layout.width / 2),
+                    screen_infos[2], ((float)bottom_screen.left / 2) + ((float)layout.width / 2),
                     (float)bottom_screen.top, (float)bottom_screen.GetWidth() / 2,
                     (float)bottom_screen.GetHeight());
             } else if (stereo_single_screen) {
@@ -905,6 +989,26 @@ void RendererOpenGL::DrawScreens(const Layout::FramebufferLayout& layout) {
                                               (float)bottom_screen.GetWidth(),
                                               (float)bottom_screen.GetHeight());
             }
+        } else {
+            if (Settings::values.render_3d == Settings::StereoRenderOption::Off) {
+                DrawSingleScreen(screen_infos[2], (float)bottom_screen.left,
+                                 (float)bottom_screen.top, (float)bottom_screen.GetWidth(),
+                                 (float)bottom_screen.GetHeight());
+            } else if (Settings::values.render_3d == Settings::StereoRenderOption::SideBySide) {
+                DrawSingleScreen(screen_infos[2], (float)bottom_screen.left / 2,
+                                 (float)bottom_screen.top, (float)bottom_screen.GetWidth() / 2,
+                                 (float)bottom_screen.GetHeight());
+                glUniform1i(uniform_layer, 1);
+                DrawSingleScreen(screen_infos[2],
+                                 ((float)bottom_screen.left / 2) + ((float)layout.width / 2),
+                                 (float)bottom_screen.top, (float)bottom_screen.GetWidth() / 2,
+                                 (float)bottom_screen.GetHeight());
+            } else if (stereo_single_screen) {
+                DrawSingleScreenStereo(screen_infos[2], screen_infos[2], (float)bottom_screen.left,
+                                       (float)bottom_screen.top, (float)bottom_screen.GetWidth(),
+                                       (float)bottom_screen.GetHeight());
+            }
+        }
     }
 }
 

src/video_core/renderer_opengl/renderer_opengl.h

@@ -77,9 +77,12 @@ private:
                                      const GPU::Regs::FramebufferConfig& framebuffer);
     void DrawScreens(const Layout::FramebufferLayout& layout);
     void DrawSingleScreenRotated(const ScreenInfo& screen_info, float x, float y, float w, float h);
+    void DrawSingleScreen(const ScreenInfo& screen_info, float x, float y, float w, float h);
     void DrawSingleScreenStereoRotated(const ScreenInfo& screen_info_l,
                                        const ScreenInfo& screen_info_r, float x, float y, float w,
                                        float h);
+    void DrawSingleScreenStereo(const ScreenInfo& screen_info_l, const ScreenInfo& screen_info_r,
+                                float x, float y, float w, float h);
     void UpdateFramerate();
 
     // Loads framebuffer from emulated memory into the display information structure