Restore explosion parity systems

src/main/java/com/vinlanx/explosionoverhaul/client/DeafnessConcussionEffect.java

@@ -5,24 +5,48 @@ import net.minecraft.client.Minecraft;
 public class DeafnessConcussionEffect {
     public static boolean debugShowChat = false;
     public static volatile boolean enabled = true;
+    private static int ticksRemaining;
+    private static int totalTicks;
+    private static float intensity;
 
     public static boolean start(float intensity, double silentSeconds, double effectivePercent, String visibility, int intensityPercent) {
-        return false;
+        if (!enabled) {
+            return false;
+        }
+        DeafnessConcussionEffect.intensity = Math.max(DeafnessConcussionEffect.intensity, intensity);
+        totalTicks = Math.max(1, (int)Math.round(Math.max(1.0, silentSeconds) * 20.0));
+        ticksRemaining = Math.max(ticksRemaining, totalTicks);
+        LowPassConcussionEffect.setDeafnessGain((float)Math.max(0.18, 1.0 - intensity * 0.75));
+        return true;
     }
 
     public static void stop() {
+        ticksRemaining = 0;
+        intensity = 0.0f;
+        resetVolume();
     }
 
     public static boolean isActive() {
-        return false;
+        return enabled && ticksRemaining > 0 && intensity > 0.01f;
     }
 
     public static void resetVolume() {
+        LowPassConcussionEffect.setDeafnessGain(1.0f);
     }
 
     public static void applyMasterVolume(Minecraft mc, double volume) {
     }
 
+    public static void onClientTick() {
+        if (ticksRemaining <= 0) {
+            stop();
+            return;
+        }
+        --ticksRemaining;
+        double remaining = ticksRemaining / Math.max(1.0, totalTicks);
+        LowPassConcussionEffect.setDeafnessGain((float)Math.max(0.18, lerp(1.0, 1.0 - intensity * 0.75, easeOutQuad(remaining))));
+    }
+
     public static double lerp(double a, double b, double t) {
         return a + (b - a) * t;
     }