Add Fog Occlusion for particles

common/src/main/java/net/caffeinemc/mods/sodium/mixin/features/render/particle/ParticleEngineMixin.java

@@ -0,0 +1,55 @@
+package net.caffeinemc.mods.sodium.mixin.features.render.particle;
+
+import com.mojang.blaze3d.systems.RenderSystem;
+import com.mojang.blaze3d.vertex.VertexConsumer;
+import net.caffeinemc.mods.sodium.client.SodiumClientMod;
+import net.minecraft.client.Camera;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.particle.Particle;
+import net.minecraft.client.particle.ParticleEngine;
+import net.minecraft.util.Mth;
+import net.minecraft.world.phys.Vec3;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(ParticleEngine.class)
+public class ParticleEngineMixin {
+
+    /**
+     * @author AnOpenSauceDev
+     * @reason Prevent Minecraft from rendering particles that are fog occluded.
+     */
+    @Redirect(method = "render", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/particle/Particle;render(Lcom/mojang/blaze3d/vertex/VertexConsumer;Lnet/minecraft/client/Camera;F)V"))
+    public void particleFogOcclusion(Particle instance, VertexConsumer vertexConsumer, Camera camera, float v){
+        if(!SodiumClientMod.options().performance.useFogOcclusion){
+            instance.render(vertexConsumer,camera,v);
+            return;
+        }
+
+        if(sodium$isParticleFogOccluded(camera.getPosition(),instance.getBoundingBox().getCenter())){
+            instance.render(vertexConsumer,camera,v);
+        }
+    }
+
+    @Unique
+    public boolean sodium$isParticleFogOccluded(Vec3 pointA, Vec3 pointB){
+        double dx = pointA.x - pointB.x;
+        double dz = pointA.z - pointB.z;
+        double distance = (dx * dx + dz * dz);
+
+        var shaderFog = RenderSystem.getShaderFog();
+        double shaderFogDistance = shaderFog.end();
+
+        var renderDistance = Minecraft.getInstance().gameRenderer.getRenderDistance();
+
+        if(!Mth.equal(shaderFog.alpha(),1.0f)){
+            return false;
+        }
+
+        var fogDist = Math.min(renderDistance,shaderFogDistance);
+
+        return distance < fogDist * fogDist;
+    }
+}

common/src/main/resources/sodium-common.mixins.json

@@ -65,6 +65,7 @@
     "features.render.model.ItemBlockRenderTypesMixin",
     "features.render.model.item.ItemRendererMixin",
     "features.render.particle.SingleQuadParticleMixin",
+    "features.render.particle.ParticleEngineMixin",
     "features.render.world.clouds.LevelRendererMixin",
     "features.render.world.sky.FogRendererMixin",
     "features.render.world.sky.ClientLevelMixin",