Actually, It's not an OpenGL question.
This is how I draw things in OpenGL:
glEnableClientState (GL_VERTEX_ARRAY); glEnableClientState (GL_NORMAL_ARRAY); glEnableClientState (GL_TEXTURE_COORD_ARRAY); glVertexPointer(3, GL_FLOAT, sizeof(VertexBuffer), obj->m_vertices[0].vertex); glTexCoordPointer(2, GL_FLOAT, sizeof(VertexBuffer), obj->m_vertices[0].texCoord); glNormalPointer(GL_FLOAT, sizeof(VertexBuffer), obj->m_vertices[0].normal); glDrawElements (GL_TRIANGLES, obj->indicesCount, GL_UNSIGNED_INT, obj->indices); glDisableClientState (GL_VERTEX_ARRAY); glDisableClientState (GL_NORMAL_ARRAY); glDisableClientState (GL_TEXTURE_COORD_ARRAY);
As you see here, I don't use any memcpy..
And this is how I have to draw in DirectX: (Pseudo)
D3DVERTEX *ptr = NULL; app.getDevice()->CreateVertexBuffer(sizeof(quad), D3DUSAGE_WRITEONLY, 0, D3DPOOL_MANAGED, &vertex_buffer, NULL); vertex_buffer->Lock(0, 0, (void**)&ptr, 0); memcpy((void*)ptr, (void*)vetices_of_quad, sizeof(vetices_of_quad)); vertex_buffer->Unlock();
As you see here, I have to use a "memcpy" each frame.. Why each frame, because I can't keep my LPDIRECT3DVERTEXBUFFER9 object..
I just want to hold my vertex data in my own vertex buffer class (VertexBuffer), and be able to use it in both OpenGL and DirectX, without copying the data each frame..
I don't know DirectX much.. I'm a newbie.
Please help 
(BTW, sorry for my bad English)