3 files changed, 96 insertions, 9 deletions

diff --git a/indra/newview/gltf/asset.cpp b/indra/newview/gltf/asset.cpp
index a4efb25860..4c1da3e645 100644
--- a/indra/newview/gltf/asset.cpp
+++ b/indra/newview/gltf/asset.cpp
@@ -45,7 +45,8 @@ namespace LL
     namespace GLTF
     {
         static std::unordered_set<std::string> ExtensionsSupported = {
-            "KHR_materials_unlit"
+            "KHR_materials_unlit",
+            "KHR_texture_transform"
         };
 
         Material::AlphaMode gltf_alpha_mode_to_enum(const std::string& alpha_mode)
@@ -906,6 +907,7 @@ void Material::TextureInfo::serialize(object& dst) const
 {
     write(mIndex, "index", dst, INVALID_INDEX);
     write(mTexCoord, "texCoord", dst, 0);
+    write_extensions(dst, &mTextureTransform, "KHR_texture_transform");
 }
 
 const Material::TextureInfo& Material::TextureInfo::operator=(const Value& src)
@@ -914,6 +916,7 @@ const Material::TextureInfo& Material::TextureInfo::operator=(const Value& src)
     {
         copy(src, "index", mIndex);
         copy(src, "texCoord", mTexCoord);
+        copy_extensions(src, "KHR_texture_transform", &mTextureTransform);
     }
 
     return *this;
@@ -931,17 +934,16 @@ bool Material::TextureInfo::operator!=(const Material::TextureInfo& rhs) const
 
 void Material::OcclusionTextureInfo::serialize(object& dst) const
 {
-    write(mIndex, "index", dst, INVALID_INDEX);
-    write(mTexCoord, "texCoord", dst, 0);
+    TextureInfo::serialize(dst);
     write(mStrength, "strength", dst, 1.f);
 }
 
 const Material::OcclusionTextureInfo& Material::OcclusionTextureInfo::operator=(const Value& src)
 {
+    TextureInfo::operator=(src);
+
     if (src.is_object())
     {
-        copy(src, "index", mIndex);
-        copy(src, "texCoord", mTexCoord);
         copy(src, "strength", mStrength);
     }
 
@@ -950,13 +952,13 @@ const Material::OcclusionTextureInfo& Material::OcclusionTextureInfo::operator=(
 
 void Material::NormalTextureInfo::serialize(object& dst) const
 {
-    write(mIndex, "index", dst, INVALID_INDEX);
-    write(mTexCoord, "texCoord", dst, 0);
+    TextureInfo::serialize(dst);
     write(mScale, "scale", dst, 1.f);
 }
 
 const Material::NormalTextureInfo& Material::NormalTextureInfo::operator=(const Value& src)
 {
+    TextureInfo::operator=(src);
     if (src.is_object())
     {
         copy(src, "index", mIndex);
@@ -1015,6 +1017,41 @@ void Material::Unlit::serialize(object& dst) const
     // no members and object has already been created, nothing to do
 }
 
+void TextureTransform::getPacked(F32* packed) const
+{
+    packed[0] = mScale.x;
+    packed[1] = mScale.y;
+    packed[2] = mRotation;
+    packed[3] = mOffset.x;
+    packed[4] = mOffset.y;
+
+    packed[5] = packed[6] = packed[7] = 0.f;
+}
+
+
+const TextureTransform& TextureTransform::operator=(const Value& src)
+{
+    mPresent = true;
+    if (src.is_object())
+    {
+        copy(src, "offset", mOffset);
+        copy(src, "rotation", mRotation);
+        copy(src, "scale", mScale);
+        copy(src, "texCoord", mTexCoord);
+    }
+
+    return *this;
+}
+
+void TextureTransform::serialize(object& dst) const
+{
+    write(mOffset, "offset", dst, vec2(0.f, 0.f));
+    write(mRotation, "rotation", dst, 0.f);
+    write(mScale, "scale", dst, vec2(1.f, 1.f));
+    write(mTexCoord, "texCoord", dst, 0);
+}
+
+
 void Material::serialize(object& dst) const
 {
     write(mName, "name", dst);
diff --git a/indra/newview/gltf/asset.h b/indra/newview/gltf/asset.h
index 8f28e5905f..bca269d5dc 100644
--- a/indra/newview/gltf/asset.h
+++ b/indra/newview/gltf/asset.h
@@ -57,6 +57,21 @@ namespace LL
             bool mPresent = false;
         };
 
+        class TextureTransform : public Extension // KHR_texture_transform implementation
+        {
+        public:
+            vec2 mOffset = vec2(0.f, 0.f);
+            F32 mRotation = 0.f;
+            vec2 mScale = vec2(1.f, 1.f);
+            S32 mTexCoord = INVALID_INDEX;
+
+            // get the texture transform as a packed array of floats
+            // dst MUST point to at least 8 floats
+            void getPacked(F32* dst) const;
+
+            const TextureTransform& operator=(const Value& src);
+            void serialize(boost::json::object& dst) const;
+        };
 
         class Material
         {
@@ -82,6 +97,8 @@ namespace LL
                 S32 mIndex = INVALID_INDEX;
                 S32 mTexCoord = 0;
 
+                TextureTransform mTextureTransform;
+
                 bool operator==(const TextureInfo& rhs) const;
                 bool operator!=(const TextureInfo& rhs) const;
 
diff --git a/indra/newview/gltf/buffer_util.h b/indra/newview/gltf/buffer_util.h
index c26752a6b6..943a1748f9 100644
--- a/indra/newview/gltf/buffer_util.h
+++ b/indra/newview/gltf/buffer_util.h
@@ -590,8 +590,8 @@ namespace LL
         // Write all extensions to dst.extensions
         // Usage:
         //  write_extensions(dst,
-        //                   "KHR_materials_unlit", mUnlit,
-        //                   "KHR_materials_pbrSpecularGlossiness", mPbrSpecularGlossiness);
+        //                   mUnlit, "KHR_materials_unlit",
+        //                   mPbrSpecularGlossiness, "KHR_materials_pbrSpecularGlossiness");
         // returns true if any of the extensions are written
         template<class... Types>
         inline bool write_extensions(boost::json::object& dst, Types... args)
@@ -816,6 +816,39 @@ namespace LL
             return true;
         }
 
+        // vec2
+        template<>
+        inline bool copy(const Value& src, vec2& dst)
+        {
+            if (src.is_array())
+            {
+                const boost::json::array& arr = src.as_array();
+                if (arr.size() == 2)
+                {
+                    std::error_code ec;
+                    vec3 t;
+                    t.x = arr[0].to_number<F32>(ec); if (ec) return false;
+                    t.y = arr[1].to_number<F32>(ec); if (ec) return false;
+
+                    dst = t;
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        template<>
+        inline bool write(const vec2& src, Value& dst)
+        {
+            dst = boost::json::array();
+            boost::json::array& arr = dst.as_array();
+            arr.resize(2);
+            arr[0] = src.x;
+            arr[1] = src.y;
+            
+            return true;
+        }
+
         // bool
         template<>
         inline bool copy(const Value& src, bool& dst)