From 8474c8e8b1102aa92a3ed957b7e842c61953cc2b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henrik=20Rydg=C3=A5rd?= <hrydgard@gmail.com>
Date: Fri, 16 Dec 2022 09:09:21 +0100
Subject: [PATCH] Add setting for transparent UI background

Fixes #16593
---
 Core/Config.cpp           |  1 +
 Core/Config.h             |  1 +
 UI/GameSettingsScreen.cpp |  3 ++-
 UI/MiscScreens.cpp        | 13 +++++++++----
 UI/MiscScreens.h          |  5 ++++-
 5 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/Core/Config.cpp b/Core/Config.cpp
index ad93c3aef23a..820ab1d9290d 100644
--- a/Core/Config.cpp
+++ b/Core/Config.cpp
@@ -600,6 +600,7 @@ static ConfigSetting generalSettings[] = {
 	ConfigSetting("InternalScreenRotation", &g_Config.iInternalScreenRotation, ROTATION_LOCKED_HORIZONTAL, true, true),
 
 	ConfigSetting("BackgroundAnimation", &g_Config.iBackgroundAnimation, 1, true, false),
+	ConfigSetting("TransparentBackground", &g_Config.bTransparentBackground, true, true, false),
 	ConfigSetting("UITint", &g_Config.fUITint, 0.0, true, false),
 	ConfigSetting("UISaturation", &g_Config.fUISaturation, &DefaultUISaturation, true, false),
 
diff --git a/Core/Config.h b/Core/Config.h
index 64d17da3a1d5..60a148d4e34a 100644
--- a/Core/Config.h
+++ b/Core/Config.h
@@ -276,6 +276,7 @@ struct Config {
 	float fGameGridScale;
 	bool bShowOnScreenMessages;
 	int iBackgroundAnimation;  // enum BackgroundAnimation
+	bool bTransparentBackground;
 
 	std::string sThemeName;
 
diff --git a/UI/GameSettingsScreen.cpp b/UI/GameSettingsScreen.cpp
index 32c71aedf90e..8bb2e4cf13e0 100644
--- a/UI/GameSettingsScreen.cpp
+++ b/UI/GameSettingsScreen.cpp
@@ -882,6 +882,8 @@ void GameSettingsScreen::CreateViews() {
 		backgroundChoice_->OnClick.Handle(this, &GameSettingsScreen::OnChangeBackground);
 	}
 
+	systemSettings->Add(new CheckBox(&g_Config.bTransparentBackground, sy->T("Transparent UI background")));
+
 	PopupMultiChoiceDynamic *theme = systemSettings->Add(new PopupMultiChoiceDynamic(&g_Config.sThemeName, sy->T("Theme"), GetThemeInfoNames(), th->GetName(), screenManager()));
 	theme->OnChoice.Add([=](EventParams &e) {
 		UpdateTheme(screenManager()->getUIContext());
@@ -889,7 +891,6 @@ void GameSettingsScreen::CreateViews() {
 		return UI::EVENT_CONTINUE;
 	});
 
-
 	if (!draw->GetBugs().Has(Draw::Bugs::RASPBERRY_SHADER_COMP_HANG)) {
 		// We use shaders without tint capability on hardware with this driver bug.
 		PopupSliderChoiceFloat *tint = new PopupSliderChoiceFloat(&g_Config.fUITint, 0.0, 1.0, sy->T("Color Tint"), 0.01f, screenManager());
diff --git a/UI/MiscScreens.cpp b/UI/MiscScreens.cpp
index d1dbb2dd1bad..fef1fae1b990 100644
--- a/UI/MiscScreens.cpp
+++ b/UI/MiscScreens.cpp
@@ -358,11 +358,11 @@ uint32_t GetBackgroundColorWithAlpha(const UIContext &dc) {
 	return colorAlpha(colorBlend(dc.GetTheme().backgroundColor, 0, 0.5f), 0.65f);  // 0.65 = 166 = A6
 }
 
-void DrawGameBackground(UIContext &dc, const Path &gamePath, float x, float y, float z, bool darkenBackground) {
+void DrawGameBackground(UIContext &dc, const Path &gamePath, float x, float y, float z, bool transparent, bool darkenBackground) {
 	using namespace Draw;
 	using namespace UI;
 
-	if (PSP_IsInited() && !g_Config.bSkipBufferEffects) {
+	if (transparent && PSP_IsInited() && !g_Config.bSkipBufferEffects) {
 		gpu->CheckDisplayResized();
 		gpu->CheckConfigChanged();
 		gpu->CopyDisplayToOutput(true);
@@ -457,7 +457,7 @@ void UIScreenWithGameBackground::DrawBackground(UIContext &dc) {
 	float x, y, z;
 	screenManager()->getFocusPosition(x, y, z);
 	if (!gamePath_.empty()) {
-		DrawGameBackground(dc, gamePath_, x, y, z, darkenGameBackground_);
+		DrawGameBackground(dc, gamePath_, x, y, z, (g_Config.bTransparentBackground || forceTransparent_), darkenGameBackground_);
 	} else {
 		::DrawBackground(dc, 1.0f, x, y, z);
 		dc.Flush();
@@ -477,7 +477,12 @@ void UIDialogScreenWithGameBackground::DrawBackground(UIContext &dc) {
 	using namespace Draw;
 	float x, y, z;
 	screenManager()->getFocusPosition(x, y, z);
-	DrawGameBackground(dc, gamePath_, x, y, z, darkenGameBackground_);
+	if (!gamePath_.empty()) {
+		DrawGameBackground(dc, gamePath_, x, y, z, (g_Config.bTransparentBackground || forceTransparent_), darkenGameBackground_);
+	} else {
+		::DrawBackground(dc, 1.0f, x, y, z);
+		dc.Flush();
+	}
 }
 
 void UIDialogScreenWithGameBackground::sendMessage(const char *message, const char *value) {
diff --git a/UI/MiscScreens.h b/UI/MiscScreens.h
index f91cfa6bfeef..c55a24a72558 100644
--- a/UI/MiscScreens.h
+++ b/UI/MiscScreens.h
@@ -52,7 +52,8 @@ class UIScreenWithGameBackground : public UIScreenWithBackground {
 protected:
 	Path gamePath_;
 
-	bool darkenGameBackground_ = false;
+	bool forceTransparent_ = false;
+	bool darkenGameBackground_ = true;
 };
 
 class UIDialogScreenWithBackground : public UIDialogScreen {
@@ -73,6 +74,8 @@ class UIDialogScreenWithGameBackground : public UIDialogScreenWithBackground {
 	void sendMessage(const char *message, const char *value) override;
 protected:
 	Path gamePath_;
+
+	bool forceTransparent_ = false;
 	bool darkenGameBackground_ = true;
 };