Render To Texture中的问题

scwojiushiwo 2010-10-09 11:08:10

在d3d中，我使用rrt时，写了如下代码，不知道为什么在纹理上画的四边形显示不出来

g_pD3DDevice->CreateTexture(256,256,1,D3DUSAGE_RENDERTARGET,D3DFMT_R5G6B5,D3DPOOL_DEFAULT,&pRenderTexture,NULL);

pRenderTexture->GetSurfaceLevel(0,&pRenderSurface);

//D3DXMatrixPerspectiveFovLH(&matProjection,D3DX_PI / 4.0f,1,1,100);

D3DXMatrixOrthoOffCenterLH(&matProjection,-2.0f,2.0f,-2.0f,2.0f,0,100);

g_pD3DDevice->GetTransform(D3DTS_PROJECTION,&matOldProjection);

g_pD3DDevice->GetRenderTarget(0,&pBackBuffer);



//D3D loop

while(g_App.GetD3DStatus())

 {

 if(PeekMessage(&Message,NULL,0,0,PM_REMOVE))

  {

  TranslateMessage(&Message);

  DispatchMessage(&Message);

  }



 if(g_App.CheckDevice())

  {

  //render-to-texture

  g_pD3DDevice->SetRenderTarget(0,pRenderSurface);

  g_pD3DDevice->Clear(0,NULL,D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,D3DCOLOR_XRGB(100,100,100),1.0f,0);

  g_pD3DDevice->BeginScene();





  D3DXMatrixRotationY(&matRotationY,fRotation);

  D3DXMatrixTranslation(&matTranslation,0.0f,0.0f,5.0f);

  g_pD3DDevice->SetTransform(D3DTS_WORLD,&(matRotationY * matTranslation));

  g_pD3DDevice->SetTransform(D3DTS_PROJECTION,&matProjection);



  g_pD3DDevice->SetStreamSource(0,pTriangleVB,0,sizeof(D3DVERTEX));

  g_pD3DDevice->SetFVF(D3DFVF_CUSTOMVERTEX);

  g_pD3DDevice->DrawPrimitive(D3DPT_TRIANGLESTRIP,0,2);



  g_pD3DDevice->EndScene();



  //render scene with texture

  g_pD3DDevice->SetRenderTarget(0,pBackBuffer);

  g_pD3DDevice->Clear(0,NULL,D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,D3DCOLOR_XRGB(0,0,0),1.0f,0);

  g_pD3DDevice->BeginScene();



  g_pD3DDevice->SetTexture(0,pRenderTexture);



  g_pD3DDevice->SetTransform(D3DTS_WORLD,&matTranslation);

  g_pD3DDevice->SetTransform(D3DTS_PROJECTION,&matOldProjection);



  g_pD3DDevice->SetStreamSource(0,pQuadVB,0,sizeof(D3DVERTEX));

  g_pD3DDevice->SetFVF(D3DFVF_CUSTOMVERTEX);

  g_pD3DDevice->DrawPrimitive(D3DPT_TRIANGLESTRIP,0,2);



  g_pD3DDevice->EndScene();

  g_pD3DDevice->Present(NULL,NULL,NULL,NULL);