Feature: Weather module

src/main/java/com/lambda/mixin/render/WeatherRenderingMixin.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2025 Lambda
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.lambda.mixin.render;
+
+import com.lambda.module.modules.render.Weather;
+import net.minecraft.client.render.WeatherRendering;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+import net.minecraft.world.biome.Biome;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(WeatherRendering.class)
+public class WeatherRenderingMixin {
+    @Inject(method = "getPrecipitationAt", at = @At("HEAD"), cancellable = true)
+    private void injectGetPrecipitationAt(World world, BlockPos pos, CallbackInfoReturnable<Biome.Precipitation> cir) {
+        if (Weather.INSTANCE.isEnabled()) {
+            Weather.WeatherMode mode = Weather.getWeatherMode();
+            if (world.getRegistryKey() == World.OVERWORLD) {
+                if (mode == Weather.WeatherMode.Rain && Weather.getOverrideSnow()) cir.setReturnValue(Biome.Precipitation.RAIN);
+                else if (mode == Weather.WeatherMode.Snow) cir.setReturnValue(Biome.Precipitation.SNOW);
+            } else {
+                if (mode == Weather.WeatherMode.Snow) cir.setReturnValue(Biome.Precipitation.SNOW);
+                else cir.setReturnValue(Biome.Precipitation.RAIN);
+            }
+        }
+    }
+}

src/main/java/com/lambda/mixin/world/WorldMixin.java

@@ -19,18 +19,40 @@
 
 import com.lambda.event.EventFlow;
 import com.lambda.event.events.WorldEvent;
+import com.lambda.module.modules.render.Weather;
 import net.minecraft.block.BlockState;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 
 @Mixin(World.class)
 public abstract class WorldMixin {
     @Inject(method = "onBlockStateChanged", at = @At("TAIL"))
     void onBlockChanged(BlockPos pos, BlockState oldBlock, BlockState newBlock, CallbackInfo ci) {
         EventFlow.post(new WorldEvent.BlockUpdate.Client(pos, oldBlock, newBlock));
     }
+
+    @Inject(method = "getThunderGradient(F)F", at = @At("HEAD"), cancellable = true)
+    private void injectGetThunderGradient(float tickProgress, CallbackInfoReturnable<Float> cir) {
+        if (Weather.INSTANCE.isEnabled()) {
+            if (Weather.getWeatherMode() == Weather.WeatherMode.Thunder) cir.setReturnValue(1f);
+            else cir.setReturnValue(0f);
+        }
+    }
+
+    @Inject(method = "getRainGradient", at = @At("HEAD"), cancellable = true)
+    private void injectGetRainGradient(float tickProgress, CallbackInfoReturnable<Float> cir) {
+        if (Weather.INSTANCE.isEnabled()) {
+            Weather.WeatherMode mode = Weather.getWeatherMode();
+            if (mode == Weather.WeatherMode.Rain ||
+                    mode == Weather.WeatherMode.Snow ||
+                    mode == Weather.WeatherMode.Thunder
+            ) cir.setReturnValue(1f);
+            else cir.setReturnValue(0f);
+        }
+    }
 }

src/main/kotlin/com/lambda/module/modules/render/Weather.kt

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2025 Lambda
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.lambda.module.modules.render
+
+import com.lambda.module.Module
+import com.lambda.module.tag.ModuleTag
+import com.lambda.threading.runSafe
+import com.lambda.util.NamedEnum
+import net.minecraft.world.World
+
+object Weather : Module(
+    name = "Weather",
+    description = "Modifies the client side weather",
+    tag = ModuleTag.RENDER
+) {
+    private enum class Group(override val displayName: String) : NamedEnum {
+        Overworld("Overworld"),
+        Nether("Nether"),
+        End("End")
+    }
+
+    @JvmStatic val overworldMode by setting("Overworld Mode", WeatherMode.Clear).group(Group.Overworld)
+    @JvmStatic val overrideSnow by setting("Override Snow", false) { overworldMode == WeatherMode.Rain }.group(Group.Overworld)
+    @JvmStatic val netherMode by setting("Nether Mode", WeatherMode.Clear).group(Group.Nether)
+    @JvmStatic val endMode by setting("End Mode", WeatherMode.Clear).group(Group.End)
+
+    @JvmStatic fun getWeatherMode() =
+        runSafe {
+            val dimension = world.registryKey
+            when (dimension) {
+                World.OVERWORLD -> overworldMode
+                World.NETHER -> netherMode
+                else -> endMode
+            }
+        } ?: WeatherMode.Clear
+
+    enum class WeatherMode {
+        Clear,
+        Rain,
+        Thunder,
+        Snow
+    }
+}

src/main/resources/lambda.mixins.common.json

@@ -61,6 +61,7 @@
     "render.SplashOverlayMixin",
     "render.SplashOverlayMixin$LogoTextureMixin",
     "render.TooltipComponentMixin",
+    "render.WeatherRenderingMixin",
     "render.WorldBorderRenderingMixin",
     "render.WorldRendererMixin",
     "world.BlockCollisionSpliteratorMixin",