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diff --git a/gfx/layers/mlgpu/ShaderDefinitionsMLGPU-inl.h b/gfx/layers/mlgpu/ShaderDefinitionsMLGPU-inl.h
new file mode 100644
index 0000000000..9197f7e870
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+++ b/gfx/layers/mlgpu/ShaderDefinitionsMLGPU-inl.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _include_gfx_layers_mlgpu_ShaderDefinitions_inl_h
+#define _include_gfx_layers_mlgpu_ShaderDefinitions_inl_h
+
+namespace mozilla {
+namespace layers {
+namespace mlg {
+
+inline const Maybe<gfx::Polygon>& SimpleTraits::geometry() const {
+  return mItem.geometry;
+}
+
+inline nsTArray<gfx::Triangle> SimpleTraits::GenerateTriangles(
+    const gfx::Polygon& aPolygon) const {
+  return aPolygon.ToTriangles();
+}
+
+inline SimpleTraits::TriangleVertices SimpleTraits::MakeVertex(
+    const FirstTriangle& aIgnore) const {
+  TriangleVertices v = {mRect.BottomLeft(), mRect.TopLeft(), mRect.TopRight(),
+                        mItem.layerIndex, mItem.sortOrder};
+  return v;
+}
+
+inline SimpleTraits::TriangleVertices SimpleTraits::MakeVertex(
+    const SecondTriangle& aIgnore) const {
+  TriangleVertices v = {mRect.TopRight(), mRect.BottomRight(),
+                        mRect.BottomLeft(), mItem.layerIndex, mItem.sortOrder};
+  return v;
+}
+
+inline SimpleTraits::TriangleVertices SimpleTraits::MakeVertex(
+    const gfx::Triangle& aTriangle) const {
+  TriangleVertices v = {aTriangle.p1, aTriangle.p2, aTriangle.p3,
+                        mItem.layerIndex, mItem.sortOrder};
+  return v;
+}
+
+inline SimpleTraits::UnitQuadVertex SimpleTraits::MakeUnitQuadVertex() const {
+  UnitQuadVertex v = {mRect, mItem.layerIndex, mItem.sortOrder};
+  return v;
+}
+
+inline nsTArray<gfx::TexturedTriangle> TexturedTraits::GenerateTriangles(
+    const gfx::Polygon& aPolygon) const {
+  return GenerateTexturedTriangles(aPolygon, mRect, mTexCoords);
+}
+
+inline TexturedTraits::VertexData TexturedTraits::MakeVertexData(
+    const FirstTriangle& aIgnore) const {
+  VertexData v = {mTexCoords.BottomLeft(), mTexCoords.TopLeft(),
+                  mTexCoords.TopRight()};
+  return v;
+}
+
+inline TexturedTraits::VertexData TexturedTraits::MakeVertexData(
+    const SecondTriangle& aIgnore) const {
+  VertexData v = {mTexCoords.TopRight(), mTexCoords.BottomRight(),
+                  mTexCoords.BottomLeft()};
+  return v;
+}
+
+inline TexturedTraits::VertexData TexturedTraits::MakeVertexData(
+    const gfx::TexturedTriangle& aTriangle) const {
+  VertexData v = {aTriangle.textureCoords.p1, aTriangle.textureCoords.p2,
+                  aTriangle.textureCoords.p3};
+  return v;
+}
+
+}  // namespace mlg
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // _include_gfx_layers_mlgpu_ShaderDefinitions_inl_h