diff --git a/inc/hgl/graph/BufferObject.h b/inc/hgl/graph/BufferObject.h
index 5200f14e..c4610f1b 100644
--- a/inc/hgl/graph/BufferObject.h
+++ b/inc/hgl/graph/BufferObject.h
@@ -23,7 +23,9 @@ namespace hgl
 
         protected:
 
-            friend BufferObject *CreateBuffer(GLenum type,GLenum user_pattern,BufferData *buf);
+            friend BufferObject *CreateBufferObject(GLenum,GLenum,BufferData *buf);
+            friend BufferObject *CreateBufferObject(const GLenum &,const GLenum &,const GLsizeiptr &);
+            friend BufferObject *CreateBufferObject(const GLenum &,const GLenum &,const GLsizeiptr &,void *);
 
             BufferObject(GLuint index,GLenum type);
 
diff --git a/src/RenderDevice/GLFW/RenderDeviceGLFW.cpp b/src/RenderDevice/GLFW/RenderDeviceGLFW.cpp
index cd2cd0a2..4f762d52 100644
--- a/src/RenderDevice/GLFW/RenderDeviceGLFW.cpp
+++ b/src/RenderDevice/GLFW/RenderDeviceGLFW.cpp
@@ -5,6 +5,14 @@
 
 namespace hgl
 {
+    namespace graph
+    {
+        namespace gl
+        {
+            void InitOpenGLExt();
+        }
+    }
+
     RenderWindow *CreateRenderWindowGLFW(GLFWwindow *,bool is_fullscreen);
 
     namespace
@@ -195,6 +203,7 @@ namespace hgl
 
             glfwMakeContextCurrent(win);
             InitGLEWCore();
+            graph::gl::InitOpenGLExt();
 
             return(CreateRenderWindowGLFW(win,false));
         }
@@ -218,6 +227,7 @@ namespace hgl
 
             glfwMakeContextCurrent(win);
             InitGLEWCore();
+            graph::gl::InitOpenGLExt();
 
             return(CreateRenderWindowGLFW(win,true));
         }
diff --git a/src/RenderDriver/BufferObject.cpp b/src/RenderDriver/BufferObject.cpp
index 214952e5..0d1869c8 100644
--- a/src/RenderDriver/BufferObject.cpp
+++ b/src/RenderDriver/BufferObject.cpp
@@ -124,8 +124,8 @@ namespace hgl
             if(!buf_data)return(false);
             buffer_data=buf_data;
 
-            const void *        data=buf_data->GetData();
-            const GLsizeiptr    size=buf_data->GetTotalBytes();
+            void *        data=buf_data->GetData();
+            GLsizeiptr    size=buf_data->GetTotalBytes();
 
             if(!data||size<=0)return(false);
 
diff --git a/src/RenderDriver/CMakeLists.txt b/src/RenderDriver/CMakeLists.txt
index 793faa36..765e30af 100644
--- a/src/RenderDriver/CMakeLists.txt
+++ b/src/RenderDriver/CMakeLists.txt
@@ -5,9 +5,9 @@ SET(GRAPH_SRC_FILES OpenGLDebug.cpp
                     Shader.cpp
                     BufferData.cpp
                     BufferObject.cpp
-                    VertexArray.cpp
-                    VertexBuffer.cpp
-                    VertexBufferObject.cpp
+#                     VertexArray.cpp
+#                     VertexBuffer.cpp
+#                     VertexBufferObject.cpp
                     TextureFormat.cpp
                     Texture1D.cpp
                     Texture1DDSA.cpp
diff --git a/src/RenderDriver/OpenGLExt.cpp b/src/RenderDriver/OpenGLExt.cpp
index df659075..55be7890 100644
--- a/src/RenderDriver/OpenGLExt.cpp
+++ b/src/RenderDriver/OpenGLExt.cpp
@@ -4,63 +4,14 @@ namespace hgl
 {
     namespace graph
     {
-        namespace
+        namespace gl
         {
-            enum GLAPI_SUPPORT
+            void InitBufferObjectAPI();
+
+            void InitOpenGLExt()
             {
-                gasNoSupport=-1,
-                gasNoCheck=0,
-                gasSupport=1
-            };
-
-            static GLAPI_SUPPORT support_dsa=gasNoCheck;
-        }
-
-        bool IsSupportDSA()
-        {
-            if(support_dsa==gasSupport)return(true);
-
-            //texture api
-            if(glCreateTextures
-             &&glGenerateTextureMipmap
-             &&glGetTextureLevelParameteriv
-             &&glGetTextureParameteriv
-             &&glGetCompressedTextureImage
-             &&glGetTextureImage
-             &&glBindTextureUnit
-             &&glCompressedTextureSubImage1D
-             &&glCompressedTextureSubImage2D
-             &&glTextureSubImage1D
-             &&glTextureSubImage2D
-
-             //sampler object
-             &&glGenSamplers
-             &&glBindSampler
-             &&glSamplerParameteri
-             &&glSamplerParameterfv
-
-             //vbo
-             &&glCreateBuffers
-             &&glNamedBufferData
-             &&glNamedBufferSubData
-
-             //vao
-             &&glCreateVertexArrays
-             &&glDeleteVertexArrays
-             &&glVertexArrayAttribBinding
-             &&glVertexArrayAttribFormat
-             &&glVertexArrayAttribIFormat
-             &&glVertexArrayAttribLFormat
-             &&glEnableVertexArrayAttrib
-             &&glVertexArrayVertexBuffer
-            )
-            {
-                support_dsa=gasSupport;
-                return(true);
+                InitBufferObjectAPI();
             }
-
-            support_dsa=gasNoSupport;
-            return(false);
-        }
+        }//namespace gl
     }
 }//namespace hgl