Add in some layer encapsulation and prepare drawing tick.

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "cstdint": "cpp"
+    }
+}

EarthboundBattleBackgrounds/EarthboundBattleBackgrounds/main.cpp

@@ -342,8 +342,9 @@ struct Rom{
 		BattleBackground&background;
 		BackgroundGraphics&graphics;
 		PaletteCycle cycle;
+		uint_fast16_t backgroundInd;
 		BackgroundLayer(PixelGameEngine*pge,uint_fast16_t backgroundInd,std::vector<BattleBackground>&backgrounds,std::vector<BackgroundPalette>&palettes,std::vector<BackgroundGraphics>&graphics,std::u8string_view data)
-		:pge(pge),spr(new Sprite(256,256)),distorter(*spr),background(backgrounds[backgroundInd]),graphics(graphics[background.graphicsInd]),cycle(background,palettes[background.paletteInd]){
+		:pge(pge),spr(new Sprite(256,256)),distorter(*spr),backgroundInd(backgroundInd),background(backgrounds[backgroundInd]),graphics(graphics[background.graphicsInd]),cycle(background,palettes[background.paletteInd]){
 			uint_fast32_t effectVal{((background.GetAnimation()>>16)&0xFF)};
 			if(effectVal==0)effectVal=(((background.GetAnimation()>>24)&0xFF));
 			distorter.effect=std::make_unique<DistortionEffect>(data,effectVal);
@@ -354,7 +355,20 @@ struct Rom{
 	std::vector<BattleBackground>backgrounds;
 	std::vector<BackgroundPalette>palettes;
 	std::vector<BackgroundGraphics>graphics;
+
+	const BackgroundLayer*const GetLayer1(){return layer1.get();}
+	const BackgroundLayer*const GetLayer2(){return layer2.get();}
+	void SetLayer1(uint_fast16_t backgroundInd){
+		backgroundInd=std::clamp(backgroundInd,0U,uint_fast16_t(backgrounds.size()));
+		layer1=std::make_unique<BackgroundLayer>(nullptr,backgroundInd,backgrounds,palettes,graphics,data);
+	}
+	void SetLayer2(uint_fast16_t backgroundInd){
+		backgroundInd=std::clamp(backgroundInd,0U,uint_fast16_t(backgrounds.size()));
+		layer2=std::make_unique<BackgroundLayer>(nullptr,backgroundInd,backgrounds,palettes,graphics,data);
+	}
+private:
 	std::unique_ptr<BackgroundLayer>layer1,layer2;
+public:
 	Rom(){
 		#pragma region Setup Reversed Bytes
 		reversedBytes.resize(256);
@@ -457,17 +471,28 @@ public:
 		}
 	}
 
-	void BackgroundLayerDisplayTest(){
+	int yOffset{0};
+	float accumulatedTime{};
 
+	void runTick(){
+		float alpha1{1.f},alpha2{1.f};
+		if(rom.GetLayer1()->backgroundInd&&!rom.GetLayer2()->backgroundInd){
+			alpha1=1.f;
+			alpha2=0.f;
+		}
+		if(!rom.GetLayer1()->backgroundInd&&rom.GetLayer2()->backgroundInd){
+			alpha1=0.f;
+			alpha2=1.f;
+		}
 	}
 
-	int yOffset{0};
-
 	bool OnUserUpdate(float fElapsedTime) override
 	{
-		//PaletteDisplayTest();
-		//GraphicsDisplayTest();
-		//BackgroundLayerDisplayTest();
+		accumulatedTime+=fElapsedTime;
+		while(accumulatedTime>=1/60.f){
+			runTick();
+			accumulatedTime-=1/60.f
+		}
 		return true;
 	}
 };