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Question

我不知道那个device->Clear(...)为什么不能实现
// 3D.cpp : Defines the entry point for the application.
//#include "stdafx.h"
IDirect3D9 *d3d9=0;
IDirect3DDevice9 *device=0;
bool  SetUp()
{ return true;
}
bool Display(float timeDelta)
{
    if(device->Clear(0,0,D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER,0xff000f00,1.0f,0)!=D3D_OK)
{
::MessageBox(0,"","",MB_OK);//////////////////////////////////////////////////////////////
}
device->Present(0,0,0,0);
return true;
}
bool ClearUp()
{     if(d3d9!=0)
d3d9->Release();
 if(device!=0)
 device->Release();
return true;
}void EnterMsgLoop(bool (* p)(float timeDelta))
{
   MSG msg;
   ::memset(&msg,0,sizeof(msg));
    
   static float latm=(float)timeGetTime();
   while(msg.message!=WM_QUIT)
   {
   if(::PeekMessage(&msg,0,0,0,PM_REMOVE))
   {
           ::TranslateMessage(&msg);
   ::DispatchMessage(&msg);
   }
   else
   {
           float curtm=(float)timeGetTime();
           float timeDelta = (curtm-latm)*0.002f;
   p(timeDelta);
   latm=curtm;
   }
   }}LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
   switch( msg )
{
  case WM_DESTROY:
  ::PostQuitMessage(0);
  break;
  
  case WM_KEYDOWN:
  if( wparam == VK_ESCAPE )
  ::DestroyWindow(hwnd);
  break;
}
  return ::DefWindowProc(hwnd,msg,wparam,lparam);
}  void IniTD3D(HWND *phwnd)
  {
    
       d3d9=Direct3DCreate9(D3D_SDK_VERSION);
       D3DPRESENT_PARAMETERS d3dpp;
   d3dpp.BackBufferWidth=640;
   d3dpp.BackBufferHeight=480;
       d3dpp.BackBufferFormat=D3DFMT_A8R8G8B8;
   d3dpp.BackBufferCount=1;
       d3dpp.MultiSampleType=D3DMULTISAMPLE_NONE;
    d3dpp.MultiSampleQuality=0;
        d3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;
d3dpp.hDeviceWindow=*phwnd;
         d3dpp.Windowed =true;
       d3dpp.EnableAutoDepthStencil     = false; 
   d3dpp.AutoDepthStencilFormat     = D3DFMT_D24S8;
   d3dpp.Flags                      = 0;
     d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
   d3dpp.PresentationInterval       = D3DPRESENT_INTERVAL_IMMEDIATE;
 d3d9->CreateDevice(
D3DADAPTER_DEFAULT, // primary adapter
D3DDEVTYPE_REF,         // device type
*phwnd,               // window associated with device
D3DCREATE_SOFTWARE_VERTEXPROCESSING,                 // vertex processing
    &d3dpp,             // present parameters
    &device);
  }int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR lpCmdLine, int nCmdShow)
{                    
  WNDCLASS wc;
  memset(&wc,0,sizeof(wc));
  wc.lpfnWndProc=(WNDPROC)WndProc;
  wc.style=CS_HREDRAW|CS_VREDRAW;
  wc.hInstance=hInstance;
  wc.hCursor=::LoadCursor(0,IDC_ARROW);
  wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
  wc.lpszClassName = "Direct3D9App";  ::RegisterClass(&wc);  HWND hwnd;
  hwnd=::CreateWindow("Direct3D9App","D3DTest",WS_EX_TOPMOST,
0, 0, 640,480,0 , 0 , hInstance, 0 );
  ::ShowWindow(hwnd,SW_SHOW);
  ::UpdateWindow(hwnd);   IniTD3D(&hwnd);   SetUp();  EnterMsgLoop(Display);  ClearUp();
 
return 0;                                    
}
 
// stdafx.h : #if !defined(AFX_STDAFX_H__A9DB83DB_A9FD_11D0_BFD1_444553540000__INCLUDED_)
#define AFX_STDAFX_H__A9DB83DB_A9FD_11D0_BFD1_444553540000__INCLUDED_#if _MSC_VER > 1000
#pragma once
#endif #define WIN32_LEAN_AND_MEAN #include <windows.h>
#include"mmsystem.h"
#pragma comment(lib,"winmm.lib")
#include"d3d9.h"
#pragma comment(lib,"d3d9.lib")#endif