added a standard material that it's VertexColor2DNDC.

inc/hgl/graph/mtl/2d/VertexColor2DNDC.h

@@ -0,0 +1,17 @@
+#ifndef HGL_GRAPH_MTL_2D_VERTEX2DNDC_INCLUDE
+#define HGL_GRAPH_MTL_2D_VERTEX2DNDC_INCLUDE
+
+namespace hgl
+{
+    namespace graph
+    {
+        class MaterialCreateInfo;
+
+        namespace mtl
+        {
+            MaterialCreateInfo *CreateVertexColor2DNDC();
+        }//namespace mtl
+    }//namespace graph
+}//namespace hgl
+
+#endif//HGL_GRAPH_MTL_2D_VERTEX2DNDC_INCLUDE

inc/hgl/graph/mtl/StdMaterial.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#define STD_MTL_NAMESPACE_BEGIN namespace hgl{namespace graph{namespace mtl{
+#define STD_MTL_NAMESPACE_END   }}}
+
+#define STD_MTL_NAMESPACE_USING using namespace hgl::graph::mtl