Sound fade

src/main/java/ru/betterend/mixin/client/MusicTrackerMixin.java

@@ -0,0 +1,92 @@
+package ru.betterend.mixin.client;
+
+import java.util.Random;
+
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.sound.AbstractSoundInstance;
+import net.minecraft.client.sound.MusicTracker;
+import net.minecraft.client.sound.SoundInstance;
+import net.minecraft.sound.MusicSound;
+import net.minecraft.util.math.MathHelper;
+import net.minecraft.world.World;
+
+@Mixin(MusicTracker.class)
+public class MusicTrackerMixin {
+	@Shadow
+	@Final
+	private MinecraftClient client;
+	
+	@Shadow
+	@Final
+	private Random random;
+	
+	@Shadow
+	private SoundInstance current;
+	
+	@Shadow
+	private int timeUntilNextSong;
+	
+	private static float volume = 1;
+	private static float srcVolume = 0;
+	private static long time;
+	
+	@Inject(method = "tick", at = @At("HEAD"), cancellable = true)
+	public void beOnTick(CallbackInfo info) {
+		MusicSound musicSound = client.getMusicType();
+		if (volume > 0 && beIsInEnd() && beShouldChangeSound(musicSound)) {
+			if (volume > 0) {
+				if (srcVolume < 0) {
+					srcVolume = current.getVolume();
+				}
+				if (current instanceof AbstractSoundInstance) {
+					((AbstractSoundInstanceAccessor) current).setVolume(volume);
+				}
+				client.getSoundManager().updateSoundVolume(current.getCategory(), current.getVolume() * volume);
+				long t = System.currentTimeMillis();
+				if (volume == 1 && time == 0) {
+					time = t;
+				}
+				float delta = (t - time) * 0.0005F;
+				time = t;
+				volume -= delta;
+				if (volume < 0) {
+					volume = 0;
+				}
+			}
+			if (volume == 0) {
+				volume = 1;
+				time = 0;
+				srcVolume = -1;
+				this.client.getSoundManager().stop(this.current);
+				this.timeUntilNextSong = MathHelper.nextInt(this.random, 0, musicSound.getMinDelay() / 2);
+				this.current = null;
+			}
+			if (this.current == null && this.timeUntilNextSong-- <= 0) {
+				this.play(musicSound);
+			}
+			System.out.println(volume);
+			info.cancel();
+		}
+		else {
+			volume = 1;
+		}
+	}
+	
+	private boolean beIsInEnd() {
+		return client.world != null && client.world.getRegistryKey().equals(World.END);
+	}
+	
+	private boolean beShouldChangeSound(MusicSound musicSound) {
+		return current != null && !musicSound.getSound().getId().equals(this.current.getId()) && musicSound.shouldReplaceCurrentMusic();
+	}
+	
+	@Shadow
+	public void play(MusicSound type) {}
+}