Render render-target-texture nested and many times

akira32

I try to modify the Parallel-Splits Shadow Maps for using render-target-texure to save the result. Because I want to use the deferred shading for rendering the scene. But when I use render-target-texture, some objects in the scene will be culled. I guess this problem produced from the nested and many times rendering in render-target-texture. I paste the pseudo code about the rendering in my code as below:

1. 
   
2. RenderTexture ResultTexture;
   
3. RenderTexture _ShadowMapTexture;
   
4. 
   
5. void RednerScene()
   
6. {
   
7.         ResultTexture.EnableRendering();
   
8.         D3Device->Clear(0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, D3DXCOLOR(0.5f,0.5f,0.5f,0.5f), 1.0f, 0);
   
9.         ResultTexture.DisableRendering();
   
10. 
    
11.         for(int iSplit=0;iSplit<_iNumSplits;iSplit++)
    
12.         {
    
13.                 float fNear=_pSplitDistances[iSplit];
    
14.                 float fFar=_pSplitDistances[iSplit+1];
    
15. 
    
16.                 CalculateFrustumCorners(pCorners,_vCameraSource,_vCameraTarget, _vCameraUpVector, fNear, fFar, _fCameraFOV, fCameraAspect,fScale);
    
17.                 CalculateLightForFrustum(pCorners);
    
18. 
    
19.                 _ShadowMapTexture.EnableRendering();
    
20.                 D3Device->Clear(0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, 0xFFFFFFFF, 1.0f, 0);
    
21. 
    
22.                 _pEffect->SetTechnique("RenderShadowMap");
    
23.                 RenderScene(_mLightView,_mLightProj);
    
24.                 _ShadowMapTexture.DisableRendering();
    
25. 
    
26.                 D3DVIEWPORT9 CameraViewport;
    
27.                 D3Device->GetViewport(&CameraViewport);
    
28.                 CameraViewport.MinZ=iSplit/(float)_iNumSplits;
    
29.                 CameraViewport.MaxZ=(iSplit+1)/(float)_iNumSplits;
    
30.                 D3Device->SetViewport(&CameraViewport);
    
31. 
    
32.                 CalculateViewProj ( _mCameraView, _mCameraProj, _vCameraSource, _vCameraTarget, _vCameraUpVector, _fCameraFOV, fNear, fFar, fCameraAspect);
    
33. 
    
34.                 _pEffect->SetTechnique("Shadowed_org");
    
35. 
    
36.                 D3Device->SetTexture(0,_ShadowMapTexture.GetColorTexture());
    
37. 
    
38.                 g_ResultTexture.EnableRendering();
    
39.                 RenderScene(_mCameraView, _mCameraProj);
    
40.                 g_ResultTexture.DisableRendering();
    
41. 
    
42.                 RenderResultTextureToQuad();
    
43.         }
    
44. }
    
45. 
    
46. void RenderTexture::EnableRendering(void)
    
47. {
    
48.         // Store original values
    
49.         //
    
50.         GetApp()->GetDevice()->GetViewport(&m_OldViewport);
    
51.         GetApp()->GetDevice()->GetRenderTarget(0,&m_pOldRenderTarget);
    
52.         GetApp()->GetDevice()->GetDepthStencilSurface(&m_pOldDSSurface);
    
53. 
    
54.         // Set new values
    
55.         //
    
56.         GetApp()->GetDevice()->SetViewport(&m_Viewport);
    
57.         GetApp()->GetDevice()->SetRenderTarget(0,m_pSurface);
    
58.         GetApp()->GetDevice()->SetDepthStencilSurface(m_pDSSurface);
    
59. }
    
60. 
    
61. void RenderTexture::DisableRendering(void)
    
62. {
    
63.         // Restore old depth stencil
    
64.         //
    
65.         GetApp()->GetDevice()->SetDepthStencilSurface(m_pOldDSSurface);
    
66. 
    
67.         // releasing is necessary due to reference counting
    
68.         if(m_pOldDSSurface!=NULL)
    
69.         {
    
70.                 m_pOldDSSurface->Release();
    
71.                 m_pOldDSSurface=NULL;
    
72.         }
    
73. 
    
74.         // Restore old render target
    
75.         //
    
76.         GetApp()->GetDevice()->SetRenderTarget(0,m_pOldRenderTarget);
    
77. 
    
78.         // releasing is necessary due to reference counting
    
79.         if(m_pOldRenderTarget!=NULL)
    
80.         {
    
81.                 m_pOldRenderTarget->Release();
    
82.                 m_pOldRenderTarget=NULL;
    
83.         }
    
84. 
    
85.         // Restore old viewport
    
86.         //
    
87.         GetApp()->GetDevice()->SetViewport(&m_OldViewport);
    
88. }
    

复制代码

PS:Here is my complete source code

F3:not use render-target-texture
F4:use render-target-texture

PSSM_F3.jpg is the result without using redner-target-texture(original)

PSSM_F4.jpg is the result with using redner-target-texture

Hope somebodies are interested this problem will see the code and solve this problem!