Restore intro screen and visible crater test behavior

src/main/java/com/vinlanx/explosionoverhaul/ServerExplosionHandler.java

@@ -1,14 +1,44 @@
 package com.vinlanx.explosionoverhaul;
 
+import com.vinlanx.explosionoverhaul.api.IExplosionPower;
+import com.vinlanx.explosionoverhaul.mixinhelper.ExplosionAccessor;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 import net.minecraft.core.BlockPos;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.level.Explosion;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.phys.Vec3;
 
 public class ServerExplosionHandler {
     public static void handleExplosion(ServerLevel level, Explosion explosion, List<BlockPos> affectedBlocks) {
         if (!((Boolean)Config.COMMON.enableCraterDestruction.get()).booleanValue()) {
             affectedBlocks.clear();
+            return;
+        }
+        float power = 4.0f;
+        if (explosion instanceof IExplosionPower explosionPower) {
+            power = Math.max(1.0f, explosionPower.getPower());
+        }
+        Vec3 center = explosion instanceof ExplosionAccessor accessor ? accessor.explosionoverhaul$getCenter() : Vec3.ZERO;
+        int radius = Math.max(5, Math.min(18, Math.round(power * 2.0f * ((Double)Config.COMMON.craterSizeMultiplier.get()).floatValue())));
+        Set<BlockPos> existing = new HashSet<>(affectedBlocks);
+        BlockPos origin = BlockPos.containing(center);
+        double radiusSq = radius * radius;
+        for (BlockPos pos : BlockPos.betweenClosed(origin.offset(-radius, -radius, -radius), origin.offset(radius, radius, radius))) {
+            double distanceSq = pos.distToCenterSqr(center);
+            if (distanceSq > radiusSq) {
+                continue;
+            }
+            BlockState state = level.getBlockState(pos);
+            if (state.isAir() || state.getDestroySpeed(level, pos) < 0.0f) {
+                continue;
+            }
+            BlockPos immutable = pos.immutable();
+            if (existing.add(immutable)) {
+                affectedBlocks.add(immutable);
+            }
         }
     }
 

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

@@ -22,6 +22,18 @@ public class FirstTimeSetupHandler {
 
     @SubscribeEvent
     public static void onClientTick(ClientTickEvent.Post event) {
+        Minecraft mc = Minecraft.getInstance();
+        if (!hasChecked && mc.screen instanceof TitleScreen) {
+            hasChecked = true;
+            if (Config.isFirstLaunch()) {
+                pendingShowIntro = true;
+            }
+        }
+        if (pendingShowIntro && mc.screen instanceof TitleScreen) {
+            pendingShowIntro = false;
+            mc.setScreen(new IntroSplashScreen());
+            Config.markFirstLaunchComplete();
+        }
     }
 
     static {

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

@@ -6,11 +6,27 @@ import net.minecraft.network.chat.Component;
 
 public class IntroSplashScreen extends Screen {
     public IntroSplashScreen() {
-        super(Component.empty());
+        super(Component.literal("Explosion Overhaul"));
     }
 
     @Override
     public void render(GuiGraphics graphics, int mouseX, int mouseY, float partialTick) {
+        this.renderBackground(graphics, mouseX, mouseY, partialTick);
+        graphics.drawCenteredString(this.font, Component.literal("Explosion Overhaul"), this.width / 2, this.height / 2 - 32, 0xFFFFFF);
+        graphics.drawCenteredString(this.font, Component.literal("NeoForge 1.21.1 private test port"), this.width / 2, this.height / 2 - 10, 0xD0D0D0);
+        graphics.drawCenteredString(this.font, Component.literal("Click or press any key to continue"), this.width / 2, this.height / 2 + 16, 0xA0A0A0);
         super.render(graphics, mouseX, mouseY, partialTick);
     }
+
+    @Override
+    public boolean keyPressed(int keyCode, int scanCode, int modifiers) {
+        this.onClose();
+        return true;
+    }
+
+    @Override
+    public boolean mouseClicked(double mouseX, double mouseY, int button) {
+        this.onClose();
+        return true;
+    }
 }