可不可以在一个.cpp文件中写两个顶点缓存

  Device->CreateVertexBuffer(
  6 * sizeof(Vertex),
  D3DUSAGE_WRITEONLY,
  Vertex::FVF ,
  D3DPOOL_MANAGED,
  &BackDropVB,
  0);

 Vertex* v;
 BackDropVB->Lock(0, 0, (void**)&v, 0);

 // quad built from two triangles, note texture coordinates:
 v[0] = Vertex(-10.0f, -10.0f, 5.0f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f);
 v[1] = Vertex(-10.0f,  10.0f, 5.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f);
 v[2] = Vertex( 10.0f,  10.0f, 5.0f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f);

 v[3] = Vertex(-10.0f, -10.0f, 5.0f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f);
 v[4] = Vertex( 10.0f,  10.0f, 5.0f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f);
 v[5] = Vertex( 10.0f, -10.0f, 5.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f);

 BackDropVB->Unlock();

 Device->CreateVertexBuffer(
   24 * sizeof(Vertex),                                             //6
   D3DUSAGE_WRITEONLY,
   Vertex::FVF,
   D3DPOOL_MANAGED,
   &_vb,                                            //BkGndQuad,
   0);

  Vertex* v2;
     _vb->Lock(0, 0, (void**)&v2, 0);

 // build box

 // fill in the front face vertex data
 v[0] = Vertex(-1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f);
 v[1] = Vertex(-1.0f,  1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f);
 v[2] = Vertex( 1.0f,  1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f);
 v[3] = Vertex( 1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f);

 // fill in the back face vertex data
 v[4] = Vertex(-1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f);
 v[5] = Vertex( 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f);
 v[6] = Vertex( 1.0f,  1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f);
 v[7] = Vertex(-1.0f,  1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f);

 // fill in the top face vertex data
 v[8]  = Vertex(-1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f);
 v[9]  = Vertex(-1.0f, 1.0f,  1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f);
 v[10] = Vertex( 1.0f, 1.0f,  1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f);
 v[11] = Vertex( 1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f);

 // fill in the bottom face vertex data
 v[12] = Vertex(-1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f);
 v[13] = Vertex( 1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f);
 v[14] = Vertex( 1.0f, -1.0f,  1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f);
 v[15] = Vertex(-1.0f, -1.0f,  1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f);

 // fill in the left face vertex data
 v[16] = Vertex(-1.0f, -1.0f,  1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f);
 v[17] = Vertex(-1.0f,  1.0f,  1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f);
 v[18] = Vertex(-1.0f,  1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f);
 v[19] = Vertex(-1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f);

 // fill in the right face vertex data
 v[20] = Vertex( 1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f);
 v[21] = Vertex( 1.0f,  1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f);
 v[22] = Vertex( 1.0f,  1.0f,  1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f);
 v[23] = Vertex( 1.0f, -1.0f,  1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f);

 _vb->Unlock();                                            //调试时说这边出现不能计算表达式的值的错误

请高手解答 菜鸟在这先谢过了