closes https://github.com/assimp/assimp/issues/2119: initial version.

code/glTF/glTFAsset.inl

@@ -1427,9 +1427,6 @@ inline void Asset::ReadExtensionsUsed(Document& doc)
         }
     }
 
-    #define CHECK_EXT(EXT) \
-        if (exts.find(#EXT) != exts.end()) extensionsUsed.EXT = true;
-
     CHECK_EXT(KHR_binary_glTF);
     CHECK_EXT(KHR_materials_common);
 

code/glTF/glTFCommon.h

@@ -188,7 +188,7 @@ namespace glTFCommon {
         size_t DecodeBase64(const char* in, size_t inLength, uint8_t*& out);
 
         inline
-            size_t DecodeBase64(const char* in, uint8_t*& out) {
+        size_t DecodeBase64(const char* in, uint8_t*& out) {
             return DecodeBase64(in, strlen(in), out);
         }
 
@@ -221,25 +221,22 @@ namespace glTFCommon {
         };
 
         inline
-            char EncodeCharBase64(uint8_t b) {
+        char EncodeCharBase64(uint8_t b) {
             return "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="[size_t(b)];
         }
 
         inline
-            uint8_t DecodeCharBase64(char c) {
+        uint8_t DecodeCharBase64(char c) {
             return DATA<true>::tableDecodeBase64[size_t(c)]; // TODO faster with lookup table or ifs?
-            /*if (c >= 'A' && c <= 'Z') return c - 'A';
-            if (c >= 'a' && c <= 'z') return c - 'a' + 26;
-            if (c >= '0' && c <= '9') return c - '0' + 52;
-            if (c == '+') return 62;
-            if (c == '/') return 63;
-            return 64; // '-' */
         }
 
         size_t DecodeBase64(const char* in, size_t inLength, uint8_t*& out);
 
         void EncodeBase64(const uint8_t* in, size_t inLength, std::string& out);
-    }
+    } // namespace Util
+
+#define CHECK_EXT(EXT) \
+	if (exts.find(#EXT) != exts.end()) extensionsUsed.EXT = true;
 
 }
 

code/glTF2/glTF2Asset.h

@@ -685,6 +685,10 @@ namespace glTF2
         Ref<Texture> texture;
         unsigned int index;
         unsigned int texCoord = 0;
+        
+        float offset[2];
+		float rotation;
+		float scale[2];
     };
 
     struct NormalTextureInfo : TextureInfo
@@ -1024,7 +1028,7 @@ namespace glTF2
             bool KHR_materials_pbrSpecularGlossiness;
             bool KHR_materials_unlit;
             bool KHR_lights_punctual;
-
+			bool KHR_texture_transform;
         } extensionsUsed;
 
         AssetMetadata asset;

code/glTF2/glTF2Asset.inl

@@ -800,8 +800,20 @@ inline void Texture::Read(Value& obj, Asset& r)
 }
 
 namespace {
-    inline void SetTextureProperties(Asset& r, Value* prop, TextureInfo& out)
+    inline void SetTextureProperties(Asset& r, Value* prop, TextureInfo& out) {
-    {
+	    if (r.extensionsUsed.KHR_texture_transform) {
+			if (Value *extensions = FindObject(*prop, "extensions")) {
+				if (Value *pKHR_texture_transform = FindObject(*extensions, "KHR_texture_transform")) {
+					if (Value *array = FindArray(*pKHR_texture_transform, "offset")) {
+						out.offset[0] = (*array)[0].GetFloat();
+						out.offset[1] = (*array)[1].GetFloat();
+					}                    
+					ReadMember(*pKHR_texture_transform, "rotation", out.rotation);
+					ReadMember(*pKHR_texture_transform, "scale", *out.scale);
+				}
+			}
+        }
+
         if (Value* index = FindUInt(*prop, "index")) {
             out.texture = r.textures.Retrieve(index->GetUint());
         }
@@ -877,6 +889,9 @@ inline void Material::Read(Value& material, Asset& r)
             }
         }
 
+        if (r.extensionsUsed.KHR_texture_transform) {
+		}
+
         unlit = nullptr != FindObject(*extensions, "KHR_materials_unlit");
     }
 }
@@ -1463,12 +1478,10 @@ inline void Asset::ReadExtensionsUsed(Document& doc)
         }
     }
 
-    #define CHECK_EXT(EXT) \
-        if (exts.find(#EXT) != exts.end()) extensionsUsed.EXT = true;
-
     CHECK_EXT(KHR_materials_pbrSpecularGlossiness);
     CHECK_EXT(KHR_materials_unlit);
     CHECK_EXT(KHR_lights_punctual);
+	CHECK_EXT(KHR_texture_transform);
 
     #undef CHECK_EXT
 }

code/glTF2/glTF2Exporter.h

@@ -74,6 +74,7 @@ namespace glTF2
     struct Texture;
 
     // Vec/matrix types, as raw float arrays
+	typedef float (vec2)[2];
     typedef float (vec3)[3];
     typedef float (vec4)[4];
 }