Refactor UI background rendering. There's now a BackgroundScreen.

Common/GPU/Vulkan/VulkanFramebuffer.cpp

@@ -291,7 +291,7 @@ VkRenderPass CreateRenderPass(VulkanContext *vulkan, const RPKey &key, RenderPas
 	_dbg_assert_(!(isBackbuffer && multisample));
 
 	if (isBackbuffer) {
-		_dbg_assert_(key.depthLoadAction == VKRRenderPassLoadAction::CLEAR);
+		_dbg_assert_(key.depthLoadAction != VKRRenderPassLoadAction::KEEP);
 	}
 
 	if (multiview) {

Common/System/System.h

@@ -224,6 +224,7 @@ enum class UIMessage {
 	REQUEST_GAME_PAUSE,
 	REQUEST_GAME_RESET,
 	REQUEST_GAME_STOP,
+	GAME_SELECTED,
 	SHOW_CONTROL_MAPPING,
 	SHOW_CHAT_SCREEN,
 	SHOW_DISPLAY_LAYOUT_EDITOR,

Common/UI/Screen.cpp

@@ -60,6 +60,7 @@ void ScreenManager::update() {
 		// NOTE: This is not a full UIScreen update, to avoid double global event processing.
 		overlayScreen_->update();
 	}
+	// The background screen doesn't need updating.
 	if (stack_.size()) {
 		stack_.back().screen->update();
 	}
@@ -161,7 +162,8 @@ void ScreenManager::render() {
 		// Start at the end, collect screens to form the transparency stack.
 		// Then we'll iterate them in reverse order.
 		// Note that we skip the overlay screen, we handle it separately.
-
+		// Additionally, we pick up a "background" screen. Normally it will be either
+		// the EmuScreen or the actual global background screen.
 		auto iter = stack_.end();
 		Screen *coveringScreen = nullptr;
 		Screen *backgroundScreen = nullptr;
@@ -179,7 +181,13 @@ void ScreenManager::render() {
 			}
 		} while (iter != stack_.begin());
 
-		// OK, now we iterate backwards over our little pile of screens.
+		// Confusing-looking expression, argh! Note the '_'
+		if (backgroundScreen_ && !backgroundScreen) {
+			layers.push_back(backgroundScreen_);
+			backgroundScreen = backgroundScreen_;
+		}
+
+		// OK, now we iterate backwards over our little pile of collected screens.
 		bool first = true;
 		for (int i = (int)layers.size() - 1; i >= 0; i--) {
 			ScreenRenderMode mode = ScreenRenderMode::DEFAULT;
@@ -240,8 +248,13 @@ void ScreenManager::sendMessage(UIMessage message, const char *value) {
 		touch(input);
 	}
 
-	if (!stack_.empty())
+	if (backgroundScreen_) {
+		backgroundScreen_->sendMessage(message, value);
+	}
+
+	if (!stack_.empty()) {
 		stack_.back().screen->sendMessage(message, value);
+	}
 }
 
 Screen *ScreenManager::topScreen() const {
@@ -375,10 +388,16 @@ void ScreenManager::processFinishDialog() {
 	}
 }
 
-void ScreenManager::SetOverlayScreen(Screen *screen) {
+void ScreenManager::SetBackgroundOverlayScreens(Screen *backgroundScreen, Screen *overlayScreen) {
+	if (backgroundScreen_) {
+		delete backgroundScreen_;
+	}
+	backgroundScreen_ = backgroundScreen;
+	backgroundScreen_->setScreenManager(this);
+
 	if (overlayScreen_) {
 		delete overlayScreen_;
 	}
-	overlayScreen_ = screen;
+	overlayScreen_ = overlayScreen;
 	overlayScreen_->setScreenManager(this);
 }

Common/UI/Screen.h

@@ -71,7 +71,8 @@ class Screen {
 	virtual void sendMessage(UIMessage message, const char *value) {}
 	virtual void deviceLost() {}
 	virtual void deviceRestored() {}
-	virtual bool canBeBackground() { return false; }
+	virtual bool canBeBackground() const { return false; }
+	virtual bool wantBrightBackground() const { return false; }  // special hack for DisplayLayoutScreen.
 
 	virtual void focusChanged(ScreenFocusChange focusChange);
 
@@ -86,10 +87,6 @@ class Screen {
 	ScreenManager *screenManager() { return screenManager_; }
 	void setScreenManager(ScreenManager *sm) { screenManager_ = sm; }
 
-	// This one is icky to use because you can't know what's in it until you know
-	// what screen it is.
-	virtual void *dialogData() { return 0; }
-
 	virtual const char *tag() const = 0;
 
 	virtual bool isTransparent() const { return false; }
@@ -161,7 +158,7 @@ class ScreenManager {
 	void getFocusPosition(float &x, float &y, float &z);
 
 	// Will delete any existing overlay screen.
-	void SetOverlayScreen(Screen *screen);
+	void SetBackgroundOverlayScreens(Screen *backgroundScreen, Screen *overlayScreen);
 
 	std::recursive_mutex inputLock_;
 
@@ -179,6 +176,7 @@ class ScreenManager {
 	const Screen *dialogFinished_ = nullptr;
 	DialogResult dialogResult_{};
 
+	Screen *backgroundScreen_ = nullptr;
 	Screen *overlayScreen_ = nullptr;
 
 	struct Layer {

Common/UI/UIScreen.cpp

@@ -193,41 +193,45 @@ void UIScreen::deviceRestored() {
 		root_->DeviceRestored(screenManager()->getDrawContext());
 }
 
+void UIScreen::SetupViewport() {
+	using namespace Draw;
+	Draw::DrawContext *draw = screenManager()->getDrawContext();
+	_dbg_assert_(draw != nullptr);
+	// Bind and clear the back buffer
+	draw->BindFramebufferAsRenderTarget(nullptr, { RPAction::CLEAR, RPAction::CLEAR, RPAction::CLEAR, 0xFF000000 }, "UI");
+	screenManager()->getUIContext()->BeginFrame();
+
+	Draw::Viewport viewport;
+	viewport.TopLeftX = 0;
+	viewport.TopLeftY = 0;
+	viewport.Width = g_display.pixel_xres;
+	viewport.Height = g_display.pixel_yres;
+	viewport.MaxDepth = 1.0;
+	viewport.MinDepth = 0.0;
+	draw->SetViewport(viewport);
+	draw->SetTargetSize(g_display.pixel_xres, g_display.pixel_yres);
+}
+
 void UIScreen::render(ScreenRenderMode mode) {
 	if (mode & ScreenRenderMode::FIRST) {
-		using namespace Draw;
-		Draw::DrawContext *draw = screenManager()->getDrawContext();
-		_dbg_assert_(draw != nullptr);
-		// Bind and clear the back buffer
-		draw->BindFramebufferAsRenderTarget(nullptr, { RPAction::CLEAR, RPAction::CLEAR, RPAction::CLEAR, 0xFF000000 }, "UI");
-		screenManager()->getUIContext()->BeginFrame();
-
-		Draw::Viewport viewport;
-		viewport.TopLeftX = 0;
-		viewport.TopLeftY = 0;
-		viewport.Width = g_display.pixel_xres;
-		viewport.Height = g_display.pixel_yres;
-		viewport.MaxDepth = 1.0;
-		viewport.MinDepth = 0.0;
-		draw->SetViewport(viewport);
-		draw->SetTargetSize(g_display.pixel_xres, g_display.pixel_yres);
+		SetupViewport();
 	}
 
 	DoRecreateViews();
 
 	if (root_) {
-		UIContext *uiContext = screenManager()->getUIContext();
+		UIContext &uiContext = *screenManager()->getUIContext();
 
-		UI::LayoutViewHierarchy(*uiContext, root_, ignoreInsets_);
+		UI::LayoutViewHierarchy(uiContext, root_, ignoreInsets_);
 
-		uiContext->PushTransform({translation_, scale_, alpha_});
+		uiContext.PushTransform({translation_, scale_, alpha_});
 
-		uiContext->Begin();
-		DrawBackground(*uiContext);
-		root_->Draw(*uiContext);
-		uiContext->Flush();
+		uiContext.Begin();
+		DrawBackground(uiContext);
+		root_->Draw(uiContext);
+		uiContext.Flush();
 
-		uiContext->PopTransform();
+		uiContext.PopTransform();
 	}
 }
 

Common/UI/UIScreen.h

@@ -59,7 +59,6 @@ class UIScreen : public Screen {
 
 protected:
 	virtual void CreateViews() = 0;
-	virtual void DrawBackground(UIContext &dc) {}
 
 	void RecreateViews() override { recreateViews_ = true; }
 	bool UseVerticalLayout() const;
@@ -72,6 +71,8 @@ class UIScreen : public Screen {
 	bool ignoreInput_ = false;
 
 protected:
+	virtual void DrawBackground(UIContext &ui) {}
+	void SetupViewport();
 	void DoRecreateViews();
 
 	bool recreateViews_ = true;
@@ -109,6 +110,9 @@ class PopupScreen : public UIDialogScreen {
 
 	void SetHasDropShadow(bool has) { hasDropShadow_ = has; }
 
+	// For the postproc param sliders on DisplayLayoutScreen
+	bool wantBrightBackground() const { return !hasDropShadow_; }
+
 protected:
 	virtual bool FillVertical() const { return false; }
 	virtual UI::Size PopupWidth() const { return 550; }

UI/DisplayLayoutScreen.cpp

@@ -117,19 +117,15 @@ class DisplayLayoutBackground : public UI::View {
 	float startDisplayOffsetY_ = -1.0f;
 };
 
-DisplayLayoutScreen::DisplayLayoutScreen(const Path &filename) : UIDialogScreenWithGameBackground(filename) {
-	// Show background at full brightness
-	darkenGameBackground_ = false;
-	forceTransparent_ = true;
-}
+DisplayLayoutScreen::DisplayLayoutScreen(const Path &filename) : UIDialogScreenWithGameBackground(filename) {}
 
 void DisplayLayoutScreen::DrawBackground(UIContext &dc) {
 	if (PSP_IsInited() && !g_Config.bSkipBufferEffects) {
-		// We normally rely on the PSP screen.
-		UIDialogScreenWithGameBackground::DrawBackground(dc);
+		// We normally rely on the PSP screen showing through.
 	} else {
 		// But if it's not present (we're not in game, or skip buffer effects is used),
 		// we have to draw a substitute ourselves.
+		UIContext &dc = *screenManager()->getUIContext();
 
 		// TODO: Clean this up a bit, this GetScreenFrame/CenterDisplay combo is too common.
 		FRect screenFrame = GetScreenFrame(g_display.pixel_xres, g_display.pixel_yres);
@@ -138,6 +134,7 @@ void DisplayLayoutScreen::DrawBackground(UIContext &dc) {
 
 		dc.Flush();
 		ImageID bg = ImageID("I_PSP_DISPLAY");
+		dc.Draw()->DrawImageStretch(bg, dc.GetBounds(), 0x7F000000);
 		dc.Draw()->DrawImageStretch(bg, FRectToBounds(rc), 0x7FFFFFFF);
 	}
 }

UI/DisplayLayoutScreen.h

@@ -32,18 +32,19 @@ class DisplayLayoutScreen : public UIDialogScreenWithGameBackground {
 	void dialogFinished(const Screen *dialog, DialogResult result) override;
 	void onFinish(DialogResult reason) override;
 
-	void DrawBackground(UIContext &dc) override;
-
 	void resized() override {
 		RecreateViews();
 	}
 
+	bool wantBrightBackground() const override { return true; }
+
 	const char *tag() const override { return "DisplayLayout"; }
 
 protected:
 	UI::EventReturn OnPostProcShaderChange(UI::EventParams &e);
 
 	void sendMessage(UIMessage message, const char *value) override;
+	void DrawBackground(UIContext &dc) override;
 
 private:
 	UI::ChoiceStrip *mode_ = nullptr;

UI/EmuScreen.cpp

@@ -361,6 +361,10 @@ void EmuScreen::bootGame(const Path &filename) {
 	loadingViewVisible_->Divert(UI::V_VISIBLE, 0.75f);
 
 	screenManager()->getDrawContext()->ResetStats();
+
+	if (bootPending_) {
+		System_PostUIMessage(UIMessage::GAME_SELECTED, filename.c_str());
+	}
 }
 
 void EmuScreen::bootComplete() {
@@ -424,6 +428,8 @@ EmuScreen::~EmuScreen() {
 		PSP_Shutdown();
 	}
 
+	System_PostUIMessage(UIMessage::GAME_SELECTED, "");
+
 	g_OSD.ClearAchievementStuff();
 
 	SetExtraAssertInfo(nullptr);
@@ -1409,9 +1415,32 @@ static void DrawFPS(UIContext *ctx, const Bounds &bounds) {
 	ctx->RebindTexture();
 }
 
+bool EmuScreen::canBeBackground() const {
+	if (g_Config.bSkipBufferEffects)
+		return false;
+
+	bool forceTransparent = false;  // this needs to be true somehow on the display layout screen.
+
+	if (!g_Config.bTransparentBackground && !forceTransparent)
+		return false;
+
+	return true;
+}
+
+void EmuScreen::darken() {
+	if (!screenManager()->topScreen()->wantBrightBackground()) {
+		UIContext &dc = *screenManager()->getUIContext();
+		uint32_t color = GetBackgroundColorWithAlpha(dc);
+		dc.Begin();
+		dc.RebindTexture();
+		dc.FillRect(UI::Drawable(color), dc.GetBounds());
+		dc.Flush();
+	}
+}
+
 void EmuScreen::render(ScreenRenderMode mode) {
-	if (mode == ScreenRenderMode::FIRST) {
-		// Actually, always gonna be first (?)
+	if (mode & ScreenRenderMode::FIRST) {
+		// Actually, always gonna be first when it exists (?)
 
 		using namespace Draw;
 		DrawContext *draw = screenManager()->getDrawContext();
@@ -1450,8 +1479,19 @@ void EmuScreen::render(ScreenRenderMode mode) {
 
 	g_OSD.NudgeSidebar();
 
-	if (screenManager()->topScreen() == this) {
+	if (mode & ScreenRenderMode::TOP) {
 		System_Notify(SystemNotification::KEEP_SCREEN_AWAKE);
+	} else {
+		// Not on top. Let's not execute, only draw the image.
+		thin3d->BindFramebufferAsRenderTarget(nullptr, { RPAction::CLEAR, RPAction::DONT_CARE, RPAction::DONT_CARE }, "EmuScreen_Stepping");
+		// Just to make sure.
+		if (PSP_IsInited() && !g_Config.bSkipBufferEffects) {
+			PSP_BeginHostFrame();
+			gpu->CopyDisplayToOutput(true);
+			PSP_EndHostFrame();
+			darken();
+		}
+		return;
 	}
 
 	if (invalid_) {
@@ -1548,8 +1588,11 @@ void EmuScreen::render(ScreenRenderMode mode) {
 	}
 
 	if (mode & ScreenRenderMode::TOP) {
+		// TODO: Replace this with something else.
 		if (stopRender_)
 			thin3d->WipeQueue();
+	} else if (!screenManager()->topScreen()->wantBrightBackground()) {
+		darken();
 	}
 }
 

UI/EmuScreen.h

@@ -46,6 +46,7 @@ class EmuScreen : public UIScreen {
 	void dialogFinished(const Screen *dialog, DialogResult result) override;
 	void sendMessage(UIMessage message, const char *value) override;
 	void resized() override;
+	bool canBeBackground() const override;
 
 	// Note: Unlike your average boring UIScreen, here we override the Unsync* functions
 	// to get minimal latency and full control. We forward to UIScreen when needed.
@@ -57,7 +58,7 @@ class EmuScreen : public UIScreen {
 	bool key(const KeyInput &key) override;
 
 protected:
-
+	void darken();
 	void focusChanged(ScreenFocusChange focusChange) override;
 
 private:

UI/GameScreen.cpp

@@ -51,12 +51,14 @@
 
 GameScreen::GameScreen(const Path &gamePath) : UIDialogScreenWithGameBackground(gamePath) {
 	g_BackgroundAudio.SetGame(gamePath);
+	System_PostUIMessage(UIMessage::GAME_SELECTED, gamePath.ToString());
 }
 
 GameScreen::~GameScreen() {
 	if (CRC32string == "...") {
 		Reporting::CancelCRC();
 	}
+	System_PostUIMessage(UIMessage::GAME_SELECTED, "");
 }
 
 template <typename I> std::string int2hexstr(I w, size_t hex_len = sizeof(I) << 1) {

UI/MainScreen.cpp

@@ -1389,7 +1389,6 @@ UI::EventReturn MainScreen::OnFullScreenToggle(UI::EventParams &e) {
 }
 
 void MainScreen::DrawBackground(UIContext &dc) {
-	UIScreenWithBackground::DrawBackground(dc);
 	if (highlightedGamePath_.empty() && prevHighlightedGamePath_.empty()) {
 		return;
 	}