1 files changed, 77 insertions, 0 deletions
diff --git a/extern/draco/src/common.cpp b/extern/draco/src/common.cpp
new file mode 100644
index 00000000000..6f98d8db7ef
--- /dev/null
+++ b/extern/draco/src/common.cpp
@@ -0,0 +1,77 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "common.h"
+
+#include <cstring>
+
+size_t getNumberOfComponents(char *dataType)
+{
+    if (!strcmp(dataType, "SCALAR"))
+    {
+        return 1;
+    }
+    if (!strcmp(dataType, "VEC2"))
+    {
+        return 2;
+    }
+    if (!strcmp(dataType, "VEC3"))
+    {
+        return 3;
+    }
+    if (!strcmp(dataType, "VEC4"))
+    {
+        return 4;
+    }
+    if (!strcmp(dataType, "MAT2"))
+    {
+        return 4;
+    }
+    if (!strcmp(dataType, "MAT3"))
+    {
+        return 9;
+    }
+    if (!strcmp(dataType, "MAT4"))
+    {
+        return 16;
+    }
+
+    return 0;
+}
+
+size_t getComponentByteLength(size_t componentType)
+{
+    switch (componentType)
+    {
+        case ComponentType::Byte:
+        case ComponentType::UnsignedByte:
+            return 1;
+            
+        case ComponentType::Short:
+        case ComponentType::UnsignedShort:
+            return 2;
+            
+        case ComponentType::UnsignedInt:
+        case ComponentType::Float:
+            return 4;
+            
+        default:
+            return 0;
+    }
+}
+
+size_t getAttributeStride(size_t componentType, char *dataType)
+{
+    return getComponentByteLength(componentType) * getNumberOfComponents(dataType);
+}