Add bouncing icon background animation

Core/ConfigValues.h

@@ -150,6 +150,7 @@ enum class BackgroundAnimation {
 	RECENT_GAMES = 2,
 	WAVE = 3,
 	MOVING_BACKGROUND = 4,
+	BOUNCING_ICON = 5,
 };
 
 // iOS only

UI/GameSettingsScreen.cpp

@@ -1164,7 +1164,7 @@ void GameSettingsScreen::CreateSystemSettings(UI::ViewGroup *systemSettings) {
 
 	systemSettings->Add(new PopupMultiChoice(&g_Config.iNotificationPos, sy->T("Notification screen position"), positions, -1, ARRAY_SIZE(positions), I18NCat::DIALOG, screenManager()));
 
-	static const char *backgroundAnimations[] = { "No animation", "Floating symbols", "Recent games", "Waves", "Moving background" };
+	static const char *backgroundAnimations[] = { "No animation", "Floating symbols", "Recent games", "Waves", "Moving background", "Bouncing icon" };
 	systemSettings->Add(new PopupMultiChoice(&g_Config.iBackgroundAnimation, sy->T("UI background animation"), backgroundAnimations, 0, ARRAY_SIZE(backgroundAnimations), I18NCat::SYSTEM, screenManager()));
 
 	PopupMultiChoiceDynamic *theme = systemSettings->Add(new PopupMultiChoiceDynamic(&g_Config.sThemeName, sy->T("Theme"), GetThemeInfoNames(), I18NCat::THEMES, screenManager()));

UI/MiscScreens.cpp

@@ -18,6 +18,7 @@
 #include "ppsspp_config.h"
 
 #include <algorithm>
+#include <cmath>
 #include <functional>
 
 #include "Common/Render/DrawBuffer.h"
@@ -288,6 +289,102 @@ private:
 	double nextT_ = -INTERVAL;
 };
 
+class BouncingIconAnimation : public Animation {
+	public:
+		void Draw(UIContext &dc, double t, float alpha, float x, float y, float z) override {
+			dc.Flush();
+			dc.Begin();
+
+			// Handle change in resolution.
+			float xres = dc.GetBounds().w;
+			float yres = dc.GetBounds().h;
+			if (last_xres != xres || last_yres != yres) {
+				Recalculate(xres, yres);
+			}
+
+			// Draw the image.
+			float xpos = xbase + dc.GetBounds().x;
+			float ypos = ybase + dc.GetBounds().y;
+			ImageID icon = !color_ix && System_GetPropertyBool(SYSPROP_APP_GOLD) ? ImageID("I_ICONGOLD") : ImageID("I_ICON");
+			ui_draw2d.DrawImage(icon, xpos, ypos, scale, colors[color_ix], ALIGN_CENTER);
+			dc.Flush();
+
+			// Switch direction if within border.
+			bool should_recolor = true;
+			if (xbase > xres - border || xbase < border) {
+				xspeed *= -1.0f;
+				RandomizeColor();
+				should_recolor = false;
+			}
+
+			if (ybase > yres - border || ybase < border) {
+				yspeed *= -1.0f;
+
+				if (should_recolor) {
+					RandomizeColor();
+				}
+			}
+
+			// Place to border if out of bounds.
+			if (xbase > xres - border) xbase = xres - border;
+			else if (xbase < border) xbase = border;
+			if (ybase > yres - border) ybase = yres - border;
+			else if (ybase < border) ybase = border;
+
+			// Update location.
+			xbase += xspeed;
+			ybase += yspeed;
+		}
+
+	private:
+		static constexpr int COLOR_COUNT = 11;
+		static constexpr Color colors[COLOR_COUNT] = { 0xFFFFFFFF, 0xFFFFFF00, 0xFFFF0000, 0xFF00FF00, 0xFF00FF00,
+				0xFF00FFFF, 0xFFFF00FF, 0xFF4111D1, 0xFF3577F3, 0xFFAA77FF, 0xFF623B84 };
+
+		float xbase = 0.0f;
+		float ybase = 0.0f;	
+		float last_xres = 0.0f;
+		float last_yres = 0.0f;
+		float xspeed = 1.0f;
+		float yspeed = 1.0f;
+		float scale = 1.0f;
+		float border = 35.0f;
+		int color_ix = 0;
+		int last_color_ix = -1;
+		GMRng rng;
+
+		void Recalculate(int xres, int yres) {
+			// First calculation.
+			if (last_color_ix == -1) {
+				xbase = xres / 2.0f;
+				ybase = yres / 2.0f;
+				last_color_ix = 0;
+	
+				// Determine initial direction.
+				if ((int)(rng.F() * xres) % 2) xspeed *= -1.0f;
+				if ((int)(rng.F() * yres) % 2) yspeed *= -1.0f;
+			}
+
+			// Scale certain attributes to resolution.
+			scale = std::min(xres, yres) / 400.0f;
+			float speed = scale < 2.5f ? scale * 0.58f : scale * 0.46f;
+			xspeed = std::signbit(xspeed) ? speed * -1.0f : speed;
+			yspeed = std::signbit(yspeed) ? speed * -1.0f : speed;
+			border = 35.0f * scale;
+
+			last_xres = xres;
+			last_yres = yres;
+		}
+
+		void RandomizeColor() {
+			do {
+				color_ix = (int)(rng.F() * xbase) % COLOR_COUNT;
+			} while (color_ix == last_color_ix);
+
+			last_color_ix = color_ix;
+		}
+};
+
 // TODO: Add more styles. Remember to add to the enum in ConfigValues.h and the selector in GameSettings too.
 
 static BackgroundAnimation g_CurBackgroundAnimation = BackgroundAnimation::OFF;
@@ -334,6 +431,9 @@ void DrawBackground(UIContext &dc, float alpha, float x, float y, float z) {
 		case BackgroundAnimation::MOVING_BACKGROUND:
 			g_Animation.reset(new MovingBackground());
 			break;
+		case BackgroundAnimation::BOUNCING_ICON:
+			g_Animation.reset(new BouncingIconAnimation());
+			break;
 		default:
 			g_Animation.reset(nullptr);
 		}