yuzu, video_core: Screenshot functionality

Allows capturing screenshot at the current internal resolution (native for software renderer), but a setting is available to capture it in other resolutions. The screenshot is saved to a single PNG in the current layout.

src/core/frontend/framebuffer_layout.cpp

@@ -6,6 +6,7 @@
 
 #include "common/assert.h"
 #include "core/frontend/framebuffer_layout.h"
+#include "core/settings.h"
 
 namespace Layout {
 
@@ -42,4 +43,18 @@ FramebufferLayout DefaultFrameLayout(unsigned width, unsigned height) {
     return res;
 }
 
+FramebufferLayout FrameLayoutFromResolutionScale(u16 res_scale) {
+    int width, height;
+
+    if (Settings::values.use_docked_mode) {
+        width = ScreenDocked::WidthDocked * res_scale;
+        height = ScreenDocked::HeightDocked * res_scale;
+    } else {
+        width = ScreenUndocked::Width * res_scale;
+        height = ScreenUndocked::Height * res_scale;
+    }
+
+    return DefaultFrameLayout(width, height);
+}
+
 } // namespace Layout

src/core/frontend/framebuffer_layout.h

@@ -9,6 +9,7 @@
 namespace Layout {
 
 enum ScreenUndocked : unsigned { Width = 1280, Height = 720 };
+enum ScreenDocked : unsigned { WidthDocked = 1920, HeightDocked = 1080 };
 
 /// Describes the layout of the window framebuffer
 struct FramebufferLayout {
@@ -34,4 +35,10 @@ struct FramebufferLayout {
  */
 FramebufferLayout DefaultFrameLayout(unsigned width, unsigned height);
 
+/**
+ * Convenience method to get frame layout by resolution scale
+ * @param res_scale resolution scale factor
+ */
+FramebufferLayout FrameLayoutFromResolutionScale(u16 res_scale);
+
 } // namespace Layout

src/video_core/renderer_base.cpp

@@ -27,4 +27,16 @@ void RendererBase::UpdateCurrentFramebufferLayout() {
     render_window.UpdateCurrentFramebufferLayout(layout.width, layout.height);
 }
 
+void RendererBase::RequestScreenshot(void* data, std::function<void()> callback,
+                                     const Layout::FramebufferLayout& layout) {
+    if (renderer_settings.screenshot_requested) {
+        LOG_ERROR(Render, "A screenshot is already requested or in progress, ignoring the request");
+        return;
+    }
+    renderer_settings.screenshot_bits = data;
+    renderer_settings.screenshot_complete_callback = std::move(callback);
+    renderer_settings.screenshot_framebuffer_layout = layout;
+    renderer_settings.screenshot_requested = true;
+}
+
 } // namespace VideoCore

src/video_core/renderer_base.h

@@ -9,6 +9,7 @@
 #include <optional>
 
 #include "common/common_types.h"
+#include "core/frontend/emu_window.h"
 #include "video_core/gpu.h"
 #include "video_core/rasterizer_interface.h"
 
@@ -21,6 +22,12 @@ namespace VideoCore {
 struct RendererSettings {
     std::atomic_bool use_framelimiter{false};
     std::atomic_bool set_background_color{false};
+
+    // Screenshot
+    std::atomic<bool> screenshot_requested{false};
+    void* screenshot_bits;
+    std::function<void()> screenshot_complete_callback;
+    Layout::FramebufferLayout screenshot_framebuffer_layout;
 };
 
 class RendererBase : NonCopyable {
@@ -57,9 +64,29 @@ public:
         return *rasterizer;
     }
 
+    Core::Frontend::EmuWindow& GetRenderWindow() {
+        return render_window;
+    }
+
+    const Core::Frontend::EmuWindow& GetRenderWindow() const {
+        return render_window;
+    }
+
+    RendererSettings& Settings() {
+        return renderer_settings;
+    }
+
+    const RendererSettings& Settings() const {
+        return renderer_settings;
+    }
+
     /// Refreshes the settings common to all renderers
     void RefreshBaseSettings();
 
+    /// Request a screenshot of the next frame
+    void RequestScreenshot(void* data, std::function<void()> callback,
+                           const Layout::FramebufferLayout& layout);
+
 protected:
     Core::Frontend::EmuWindow& render_window; ///< Reference to the render window handle.
     std::unique_ptr<RasterizerInterface> rasterizer;

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -138,7 +138,12 @@ void RendererOpenGL::SwapBuffers(
 
         // Load the framebuffer from memory, draw it to the screen, and swap buffers
         LoadFBToScreenInfo(*framebuffer);
-        DrawScreen();
+
+        if (renderer_settings.screenshot_requested)
+            CaptureScreenshot();
+
+        DrawScreen(render_window.GetFramebufferLayout());
+
         render_window.SwapBuffers();
     }
 
@@ -383,14 +388,13 @@ void RendererOpenGL::DrawScreenTriangles(const ScreenInfo& screen_info, float x,
 /**
  * Draws the emulated screens to the emulator window.
  */
-void RendererOpenGL::DrawScreen() {
+void RendererOpenGL::DrawScreen(const Layout::FramebufferLayout& layout) {
     if (renderer_settings.set_background_color) {
         // Update background color before drawing
         glClearColor(Settings::values.bg_red, Settings::values.bg_green, Settings::values.bg_blue,
                      0.0f);
     }
 
-    const auto& layout = render_window.GetFramebufferLayout();
     const auto& screen = layout.screen;
 
     glViewport(0, 0, layout.width, layout.height);
@@ -414,6 +418,37 @@ void RendererOpenGL::DrawScreen() {
 /// Updates the framerate
 void RendererOpenGL::UpdateFramerate() {}
 
+void RendererOpenGL::CaptureScreenshot() {
+    // Draw the current frame to the screenshot framebuffer
+    screenshot_framebuffer.Create();
+    GLuint old_read_fb = state.draw.read_framebuffer;
+    GLuint old_draw_fb = state.draw.draw_framebuffer;
+    state.draw.read_framebuffer = state.draw.draw_framebuffer = screenshot_framebuffer.handle;
+    state.Apply();
+
+    Layout::FramebufferLayout layout{renderer_settings.screenshot_framebuffer_layout};
+
+    GLuint renderbuffer;
+    glGenRenderbuffers(1, &renderbuffer);
+    glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGB8, layout.width, layout.height);
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderbuffer);
+
+    DrawScreen(layout);
+
+    glReadPixels(0, 0, layout.width, layout.height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
+                 renderer_settings.screenshot_bits);
+
+    screenshot_framebuffer.Release();
+    state.draw.read_framebuffer = old_read_fb;
+    state.draw.draw_framebuffer = old_draw_fb;
+    state.Apply();
+    glDeleteRenderbuffers(1, &renderbuffer);
+
+    renderer_settings.screenshot_complete_callback();
+    renderer_settings.screenshot_requested = false;
+}
+
 static const char* GetSource(GLenum source) {
 #define RET(s)                                                                                     \
     case GL_DEBUG_SOURCE_##s:                                                                      \

src/video_core/renderer_opengl/renderer_opengl.h

@@ -16,6 +16,10 @@ namespace Core::Frontend {
 class EmuWindow;
 }
 
+namespace Layout {
+class FramebufferLayout;
+}
+
 namespace OpenGL {
 
 /// Structure used for storing information about the textures for the Switch screen
@@ -66,10 +70,12 @@ private:
 
     void ConfigureFramebufferTexture(TextureInfo& texture,
                                      const Tegra::FramebufferConfig& framebuffer);
-    void DrawScreen();
+    void DrawScreen(const Layout::FramebufferLayout& layout);
     void DrawScreenTriangles(const ScreenInfo& screen_info, float x, float y, float w, float h);
     void UpdateFramerate();
 
+    void CaptureScreenshot();
+
     // Loads framebuffer from emulated memory into the display information structure
     void LoadFBToScreenInfo(const Tegra::FramebufferConfig& framebuffer);
     // Fills active OpenGL texture with the given RGBA color.
@@ -82,6 +88,7 @@ private:
     OGLVertexArray vertex_array;
     OGLBuffer vertex_buffer;
     OGLProgram shader;
+    OGLFramebuffer screenshot_framebuffer;
 
     /// Display information for Switch screen
     ScreenInfo screen_info;

src/video_core/video_core.cpp

@@ -3,6 +3,8 @@
 // Refer to the license.txt file included.
 
 #include <memory>
+#include "core/core.h"
+#include "core/settings.h"
 #include "video_core/renderer_base.h"
 #include "video_core/renderer_opengl/renderer_opengl.h"
 #include "video_core/video_core.h"
@@ -13,4 +15,10 @@ std::unique_ptr<RendererBase> CreateRenderer(Core::Frontend::EmuWindow& emu_wind
     return std::make_unique<OpenGL::RendererOpenGL>(emu_window);
 }
 
+u16 GetResolutionScaleFactor(const RendererBase& renderer) {
+    return !Settings::values.resolution_factor
+               ? renderer.GetRenderWindow().GetFramebufferLayout().GetScalingRatio()
+               : Settings::values.resolution_factor;
+}
+
 } // namespace VideoCore

src/video_core/video_core.h

@@ -22,4 +22,6 @@ class RendererBase;
  */
 std::unique_ptr<RendererBase> CreateRenderer(Core::Frontend::EmuWindow& emu_window);
 
+u16 GetResolutionScaleFactor(const RendererBase& renderer);
+
 } // namespace VideoCore

src/yuzu/bootmanager.cpp

@@ -14,6 +14,8 @@
 #include "input_common/keyboard.h"
 #include "input_common/main.h"
 #include "input_common/motion_emu.h"
+#include "video_core/renderer_base.h"
+#include "video_core/video_core.h"
 #include "yuzu/bootmanager.h"
 
 EmuThread::EmuThread(GRenderWindow* render_window) : render_window(render_window) {}
@@ -333,6 +335,22 @@ void GRenderWindow::InitRenderTarget() {
     BackupGeometry();
 }
 
+void GRenderWindow::CaptureScreenshot(u16 res_scale, const QString& screenshot_path) {
+    auto& renderer = Core::System::GetInstance().Renderer();
+
+    if (!res_scale)
+        res_scale = VideoCore::GetResolutionScaleFactor(renderer);
+
+    const Layout::FramebufferLayout layout{Layout::FrameLayoutFromResolutionScale(res_scale)};
+    screenshot_image = QImage(QSize(layout.width, layout.height), QImage::Format_RGB32);
+    renderer.RequestScreenshot(screenshot_image.bits(),
+                               [=] {
+                                   screenshot_image.mirrored(false, true).save(screenshot_path);
+                                   LOG_INFO(Frontend, "The screenshot is saved.");
+                               },
+                               layout);
+}
+
 void GRenderWindow::OnMinimalClientAreaChangeRequest(
     const std::pair<unsigned, unsigned>& minimal_size) {
     setMinimumSize(minimal_size.first, minimal_size.second);

src/yuzu/bootmanager.h

@@ -8,6 +8,7 @@
 #include <condition_variable>
 #include <mutex>
 #include <QGLWidget>
+#include <QImage>
 #include <QThread>
 #include "common/thread.h"
 #include "core/core.h"
@@ -139,6 +140,8 @@ public:
 
     void InitRenderTarget();
 
+    void CaptureScreenshot(u16 res_scale, const QString& screenshot_path);
+
 public slots:
     void moveContext(); // overridden
 
@@ -165,6 +168,9 @@ private:
 
     EmuThread* emu_thread;
 
+    /// Temporary storage of the screenshot taken
+    QImage screenshot_image;
+
 protected:
     void showEvent(QShowEvent* event) override;
 };

src/yuzu/configuration/config.cpp

@@ -445,6 +445,8 @@ void Config::ReadValues() {
     UISettings::values.theme = qt_config->value("theme", UISettings::themes[0].second).toString();
     UISettings::values.enable_discord_presence =
         qt_config->value("enable_discord_presence", true).toBool();
+    UISettings::values.screenshot_resolution_factor =
+        static_cast<u16>(qt_config->value("screenshot_resolution_factor", 0).toUInt());
 
     qt_config->beginGroup("UIGameList");
     UISettings::values.show_unknown = qt_config->value("show_unknown", true).toBool();
@@ -648,6 +650,8 @@ void Config::SaveValues() {
     qt_config->beginGroup("UI");
     qt_config->setValue("theme", UISettings::values.theme);
     qt_config->setValue("enable_discord_presence", UISettings::values.enable_discord_presence);
+    qt_config->setValue("screenshot_resolution_factor",
+                        UISettings::values.screenshot_resolution_factor);
 
     qt_config->beginGroup("UIGameList");
     qt_config->setValue("show_unknown", UISettings::values.show_unknown);
@@ -669,6 +673,7 @@ void Config::SaveValues() {
     qt_config->beginGroup("Paths");
     qt_config->setValue("romsPath", UISettings::values.roms_path);
     qt_config->setValue("symbolsPath", UISettings::values.symbols_path);
+    qt_config->setValue("screenshotPath", UISettings::values.screenshot_path);
     qt_config->setValue("gameListRootDir", UISettings::values.gamedir);
     qt_config->setValue("gameListDeepScan", UISettings::values.gamedir_deepscan);
     qt_config->setValue("recentFiles", UISettings::values.recent_files);

src/yuzu/main.cpp

@@ -334,6 +334,9 @@ void GMainWindow::InitializeHotkeys() {
                                    Qt::ApplicationShortcut);
     hotkey_registry.RegisterHotkey("Main Window", "Load Amiibo", QKeySequence(Qt::Key_F2),
                                    Qt::ApplicationShortcut);
+    hotkey_registry.RegisterHotkey("Main Window", "Capture Screenshot",
+                                   QKeySequence(QKeySequence::Print));
+
     hotkey_registry.LoadHotkeys();
 
     connect(hotkey_registry.GetHotkey("Main Window", "Load File", this), &QShortcut::activated,
@@ -393,6 +396,12 @@ void GMainWindow::InitializeHotkeys() {
                     OnLoadAmiibo();
                 }
             });
+    connect(hotkey_registry.GetHotkey("Main Window", "Capture Screenshot", this),
+            &QShortcut::activated, this, [&] {
+                if (emu_thread->IsRunning()) {
+                    OnCaptureScreenshot();
+                }
+            });
 }
 
 void GMainWindow::SetDefaultUIGeometry() {
@@ -488,6 +497,10 @@ void GMainWindow::ConnectMenuEvents() {
         hotkey_registry.GetHotkey("Main Window", "Fullscreen", this)->key());
     connect(ui.action_Fullscreen, &QAction::triggered, this, &GMainWindow::ToggleFullscreen);
 
+    // Movie
+    connect(ui.action_Capture_Screenshot, &QAction::triggered, this,
+            &GMainWindow::OnCaptureScreenshot);
+
     // Help
     connect(ui.action_Open_yuzu_Folder, &QAction::triggered, this, &GMainWindow::OnOpenYuzuFolder);
     connect(ui.action_Rederive, &QAction::triggered, this,
@@ -724,6 +737,7 @@ void GMainWindow::ShutdownGame() {
     ui.action_Restart->setEnabled(false);
     ui.action_Report_Compatibility->setEnabled(false);
     ui.action_Load_Amiibo->setEnabled(false);
+    ui.action_Capture_Screenshot->setEnabled(false);
     render_window->hide();
     game_list->show();
     game_list->setFilterFocus();
@@ -1261,6 +1275,7 @@ void GMainWindow::OnStartGame() {
 
     discord_rpc->Update();
     ui.action_Load_Amiibo->setEnabled(true);
+    ui.action_Capture_Screenshot->setEnabled(true);
 }
 
 void GMainWindow::OnPauseGame() {
@@ -1269,6 +1284,7 @@ void GMainWindow::OnPauseGame() {
     ui.action_Start->setEnabled(true);
     ui.action_Pause->setEnabled(false);
     ui.action_Stop->setEnabled(true);
+    ui.action_Capture_Screenshot->setEnabled(false);
 }
 
 void GMainWindow::OnStopGame() {
@@ -1431,6 +1447,18 @@ void GMainWindow::OnToggleFilterBar() {
     }
 }
 
+void GMainWindow::OnCaptureScreenshot() {
+    OnPauseGame();
+    const QString path =
+        QFileDialog::getSaveFileName(this, tr("Capture Screenshot"),
+                                     UISettings::values.screenshot_path, tr("PNG Image (*.png)"));
+    if (!path.isEmpty()) {
+        UISettings::values.screenshot_path = QFileInfo(path).path();
+        render_window->CaptureScreenshot(UISettings::values.screenshot_resolution_factor, path);
+    }
+    OnStartGame();
+}
+
 void GMainWindow::UpdateStatusBar() {
     if (emu_thread == nullptr) {
         status_bar_update_timer.stop();

src/yuzu/main.h

@@ -186,6 +186,7 @@ private slots:
     void ShowFullscreen();
     void HideFullscreen();
     void ToggleWindowMode();
+    void OnCaptureScreenshot();
     void OnCoreError(Core::System::ResultStatus, std::string);
     void OnReinitializeKeys(ReinitializeKeyBehavior behavior);
 

src/yuzu/main.ui

@@ -106,6 +106,8 @@
      <string>Tools</string>
     </property>
     <addaction name="action_Rederive"/>
+    <addaction name="separator"/>
+    <addaction name="action_Capture_Screenshot"/>
    </widget>
    <widget class="QMenu" name="menu_Help">
     <property name="title">
@@ -284,6 +286,14 @@
     <string>Open yuzu Folder</string>
    </property>
   </action>
+  <action name="action_Capture_Screenshot">
+   <property name="enabled">
+    <bool>false</bool>
+   </property>
+   <property name="text">
+    <string>Capture Screenshot</string>
+   </property>
+  </action>
  </widget>
  <resources/>
  <connections/>

src/yuzu/ui_settings.h

@@ -10,6 +10,7 @@
 #include <QByteArray>
 #include <QString>
 #include <QStringList>
+#include "common/common_types.h"
 
 namespace UISettings {
 
@@ -42,8 +43,11 @@ struct Values {
     // Discord RPC
     bool enable_discord_presence;
 
+    u16 screenshot_resolution_factor;
+
     QString roms_path;
     QString symbols_path;
+    QString screenshot_path;
     QString gamedir;
     bool gamedir_deepscan;
     QStringList recent_files;