--- a/com/mojang/blaze3d/pipeline/RenderPipeline.java
+++ b/com/mojang/blaze3d/pipeline/RenderPipeline.java
@@ -30,21 +_,42 @@
     private final @Nullable ColorTargetState[] colorTargetStates;
     private final @Nullable VertexFormat[] vertexFormatPerBuffer = new VertexFormat[16];
     private final PrimitiveTopology primitiveTopology;
+    private final Optional<net.neoforged.neoforge.client.stencil.StencilTest> stencilTest;
     private final int sortKey;
     private static int sortKeySeed;
 
-    protected RenderPipeline(
-        Identifier location,
-        Identifier vertexShader,
-        Identifier fragmentShader,
-        ShaderDefines shaderDefines,
-        List<BindGroupLayout> bindGroupLayouts,
-        @Nullable ColorTargetState[] colorTargetStates,
-        @Nullable DepthStencilState depthStencilState,
-        PolygonMode polygonMode,
-        boolean cull,
-        @Nullable VertexFormat[] vertexFormatPerBuffer,
-        PrimitiveTopology primitiveTopology,
+    /// @deprecated Neo: use [#RenderPipeline(Identifier, Identifier, Identifier, ShaderDefines, List, ColorTargetState\[\], DepthStencilState, PolygonMode, boolean, VertexFormat\[\], PrimitiveTopology, Optional, int)] instead
+    @Deprecated
+    protected RenderPipeline(
+        Identifier location,
+        Identifier vertexShader,
+        Identifier fragmentShader,
+        ShaderDefines shaderDefines,
+        List<BindGroupLayout> bindGroupLayouts,
+        @Nullable ColorTargetState[] colorTargetStates,
+        @Nullable DepthStencilState depthStencilState,
+        PolygonMode polygonMode,
+        boolean cull,
+        @Nullable VertexFormat[] vertexFormatPerBuffer,
+        PrimitiveTopology primitiveTopology,
+        int sortKey
+    ) {
+        this(location, vertexShader, fragmentShader, shaderDefines, bindGroupLayouts, colorTargetStates, depthStencilState, polygonMode, cull, vertexFormatPerBuffer, primitiveTopology, Optional.empty(), sortKey);
+    }
+
+    protected RenderPipeline(
+        Identifier location,
+        Identifier vertexShader,
+        Identifier fragmentShader,
+        ShaderDefines shaderDefines,
+        List<BindGroupLayout> bindGroupLayouts,
+        @Nullable ColorTargetState[] colorTargetStates,
+        @Nullable DepthStencilState depthStencilState,
+        PolygonMode polygonMode,
+        boolean cull,
+        @Nullable VertexFormat[] vertexFormatPerBuffer,
+        PrimitiveTopology primitiveTopology,
+        Optional<net.neoforged.neoforge.client.stencil.StencilTest> stencilTest,
         int sortKey
     ) {
         this.location = location;
@@ -57,6 +_,7 @@
         this.cull = cull;
         this.colorTargetStates = colorTargetStates;
         this.primitiveTopology = primitiveTopology;
+        this.stencilTest = stencilTest;
         this.sortKey = sortKey;
         System.arraycopy(vertexFormatPerBuffer, 0, this.vertexFormatPerBuffer, 0, this.vertexFormatPerBuffer.length);
     }
@@ -130,6 +_,48 @@
         return this.depthStencilState != null;
     }
 
+    public Optional<net.neoforged.neoforge.client.stencil.StencilTest> getStencilTest() {
+        return stencilTest;
+    }
+
+    /**
+     * Neo: Create a {@link RenderPipeline.Builder} from this {@link RenderPipeline} to adjust its configuration and
+     * build a new, modified {@link RenderPipeline} from it
+     */
+    public RenderPipeline.Builder toBuilder() {
+        RenderPipeline.Builder builder = new RenderPipeline.Builder();
+        builder.location = Optional.of(this.location);
+        builder.fragmentShader = Optional.of(this.fragmentShader);
+        builder.vertexShader = Optional.of(this.vertexShader);
+        if (!this.shaderDefines.isEmpty()) {
+            ShaderDefines.Builder defBuilder = ShaderDefines.builder();
+            for (Entry<String, String> entry : this.shaderDefines.values().entrySet()) {
+                defBuilder.define(entry.getKey(), entry.getValue());
+            }
+            for (String flag : this.shaderDefines.flags()) {
+                defBuilder.define(flag);
+            }
+            builder.definesBuilder = Optional.of(defBuilder);
+        }
+        if (!this.bindGroupLayouts.isEmpty()) {
+            builder.bindGroupLayouts = Optional.of(new ArrayList<>(this.bindGroupLayouts));
+        }
+        builder.depthStencilState = Optional.ofNullable(this.depthStencilState);
+        builder.polygonMode = Optional.of(this.polygonMode);
+        builder.cull = Optional.of(this.cull);
+        System.arraycopy(this.colorTargetStates, 0, builder.colorTargetStates, 0, this.colorTargetStates.length);
+        int activeColorTargetStateCount = 0;
+        for (int i = 0; i < this.colorTargetStates.length; i++) {
+            if (this.colorTargetStates[i] != null) {
+                activeColorTargetStateCount = i + 1;
+            }
+        }
+        System.arraycopy(this.vertexFormatPerBuffer, 0, builder.vertexFormatPerBuffer, 0, this.vertexFormatPerBuffer.length);
+        builder.primitiveTopology = Optional.of(this.primitiveTopology);
+        builder.stencilTest = this.stencilTest;
+        return builder;
+    }
+
     public static RenderPipeline.Builder builder(RenderPipeline.Snippet... snippets) {
         RenderPipeline.Builder builder = new RenderPipeline.Builder();
 
@@ -154,6 +_,7 @@
         private int activeColorTargetStateCount;
         private final @Nullable VertexFormat[] vertexFormatPerBuffer = new VertexFormat[16];
         private Optional<PrimitiveTopology> primitiveTopology = Optional.empty();
+        private Optional<net.neoforged.neoforge.client.stencil.StencilTest> stencilTest = Optional.empty();
 
         private Builder() {
         }
@@ -270,6 +_,16 @@
             return this;
         }
 
+        public RenderPipeline.Builder withStencilTest(net.neoforged.neoforge.client.stencil.StencilTest stencilTest) {
+            this.stencilTest = Optional.of(stencilTest);
+            return this;
+        }
+
+        public RenderPipeline.Builder withoutStencilTest(){
+            this.stencilTest = Optional.empty();
+            return this;
+        }
+
         private void withSnippet(RenderPipeline.Snippet snippet) {
             if (snippet.vertexShader.isPresent()) {
                 this.vertexShader = snippet.vertexShader;
@@ -332,6 +_,10 @@
             if (snippet.polygonMode.isPresent()) {
                 this.polygonMode = snippet.polygonMode;
             }
+
+            if (snippet.stencilTest.isPresent()) {
+                this.stencilTest = snippet.stencilTest;
+            }
         }
 
         public RenderPipeline.Snippet buildSnippet() {
@@ -346,7 +_,8 @@
                 this.polygonMode,
                 this.cull,
                 this.vertexFormatPerBuffer,
-                this.primitiveTopology
+                this.primitiveTopology,
+                this.stencilTest
             );
         }
 
@@ -411,6 +_,7 @@
                     this.cull.orElse(true),
                     this.vertexFormatPerBuffer,
                     this.primitiveTopology.get(),
+                    this.stencilTest,
                     nextPipelineSortKey++
                 );
             }
@@ -428,7 +_,25 @@
         Optional<PolygonMode> polygonMode,
         Optional<Boolean> cull,
         @Nullable VertexFormat[] vertexFormatPerBuffer,
-        Optional<PrimitiveTopology> vertexFormatMode
+        Optional<PrimitiveTopology> vertexFormatMode,
+        Optional<net.neoforged.neoforge.client.stencil.StencilTest> stencilTest
     ) {
+        /// @deprecated Neo: use [#Snippet(Optional, Optional, Optional, Optional, ColorTargetState\[\], int, Optional, Optional, Optional, VertexFormat\[\], Optional, Optional)] instead
+        @Deprecated
+        public Snippet(
+            Optional<Identifier> vertexShader,
+            Optional<Identifier> fragmentShader,
+            Optional<ShaderDefines> shaderDefines,
+            Optional<List<BindGroupLayout>> bindGroupLayouts,
+            @Nullable ColorTargetState[] colorTargetStates,
+            int activeColorTargetStateCount,
+            Optional<DepthStencilState> depthStencilState,
+            Optional<PolygonMode> polygonMode,
+            Optional<Boolean> cull,
+            @Nullable VertexFormat[] vertexFormatPerBuffer,
+            Optional<PrimitiveTopology> vertexFormatMode
+        ) {
+            this(vertexShader, fragmentShader, shaderDefines, bindGroupLayouts, colorTargetStates, activeColorTargetStateCount, depthStencilState, polygonMode, cull, vertexFormatPerBuffer, vertexFormatMode, Optional.empty());
+        }
     }
 }