fix chunk border rendering

src/main/java/net/irisshaders/iris/mixin/MixinChunkBorderRenderer.java

@@ -0,0 +1,41 @@
+package net.irisshaders.iris.mixin;
+
+import com.llamalad7.mixinextras.injector.WrapWithCondition;
+import com.llamalad7.mixinextras.sugar.Local;
+import com.mojang.blaze3d.vertex.VertexConsumer;
+import net.minecraft.client.renderer.debug.ChunkBorderRenderer;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Slice;
+
+@Mixin(ChunkBorderRenderer.class)
+public class MixinChunkBorderRenderer {
+	@WrapWithCondition(
+		method = "render",
+		at = @At(value = "INVOKE", target = "Lcom/mojang/blaze3d/vertex/VertexConsumer;endVertex()V"),
+		slice = @Slice(
+			from = @At(value = "INVOKE", target = "Lcom/mojang/blaze3d/vertex/PoseStack$Pose;pose()Lorg/joml/Matrix4f;"),
+			to = @At(value = "FIELD", target = "Lnet/minecraft/client/renderer/debug/ChunkBorderRenderer;CELL_BORDER:I", ordinal = 0)
+		)
+	)
+	private boolean isCameraChunk(VertexConsumer instance, @Local(ordinal = 0) int k, @Local(ordinal = 1) int l) {
+		return !((k == 0 || k == 16) && (l == 0 || l == 16));
+	}
+
+	@WrapWithCondition(
+		method = "render",
+		at = @At(value = "INVOKE", target = "Lcom/mojang/blaze3d/vertex/VertexConsumer;endVertex()V"),
+		slice = @Slice(
+			from = @At(value = "INVOKE", target = "Lnet/minecraft/client/multiplayer/ClientLevel;getMinBuildHeight()I", ordinal = 1),
+			to = @At(value = "INVOKE", target = "Lnet/minecraft/client/renderer/MultiBufferSource;getBuffer(Lnet/minecraft/client/renderer/RenderType;)Lcom/mojang/blaze3d/vertex/VertexConsumer;", ordinal = 1)
+		)
+	)
+	private boolean isSubChunkBorder(VertexConsumer instance, @Local(ordinal = 0) int k) {
+		return k % 16 != 0;
+	}
+
+
+
+
+
+}

src/main/resources/mixins.iris.json

@@ -15,6 +15,7 @@
     "MixinBlockStateBehavior",
     "MixinBooleanState",
     "MixinChainedJsonException",
+    "MixinChunkBorderRenderer",
     "MixinClientLanguage",
     "MixinClientPacketListener",
     "MixinDebugScreenOverlay",