surface with D3DFMT_A32B32G32R32F

akira32

???一下,我如何?取surface with format D3DFMT_A32B32G32R32F的每一??pixel的?色

LPDIRECT3DSURFACE9 pDestSurface_New2;
D3DLOCKED_RECT lrect_New2;
D3DSURFACE_DESC Desc2;

m_pShadowMap_QVSM_Surf_EyeDepth->GetDesc(&Desc2);
V(m_pd3dDevice->CreateOffscreenPlainSurface(Desc2.Width,Desc2.Height,Desc2.Format,D3DPOOL_SYSTEMMEM,&pDestSurface_New2,NULL));//Must be D3DPOOL_SYSTEMMEM for MSDN
V(m_pd3dDevice->GetRenderTargetData(m_pShadowMap_QVSM_Surf_EyeDepth,pDestSurface_New2));

hr=pDestSurface_New2->LockRect(&lrect_New2,NULL,D3DLOCK_NO_DIRTY_UPDATE|D3DLOCK_READONLY );

for (LONG y=0;y<(LONG)Desc.Height;y++)
{
for (LONG x=0;x<(LONG)Desc.Width;x++)
{
float depthFromEye0 = ((float*)lrect_New2.pBits)[y*(lrect_New2.Pitch/(8*sizeof(float)))+x+0];
float depthFromEye1 = ((float*)lrect_New2.pBits)[y*(lrect_New2.Pitch/(8*sizeof(float)))+x+1];
float depthFromEye2 = ((float*)lrect_New2.pBits)[y*(lrect_New2.Pitch/(8*sizeof(float)))+x+2];
float depthFromEye3 = ((float*)lrect_New2.pBits)[y*(lrect_New2.Pitch/(8*sizeof(float)))+x+3];

tonykee

lock了以后memcpy来的最实在，按字节任何字节都能按你的要求拆分和读取
一个A32B32G32R32四个通道可以划分为4个DWORD分四次memcopy，
不过，这个pixel也有点太夸张了，相当于普通的四层纹理的尺寸。

akira32

sorry!我是D3DFMT_A32B32G32R32F,不是A32B32G32R32
???一下我要如何?取每??pixel的RGB值?
((float*)lrect_New2.pBits)[y*(lrect_New2.Pitch/(8*sizeof(float)))+x+0];
???算法是否正??

tonykee

D3DFMT_A32B32G32R32F 116 128-bit float format using 32 bits for the each channel (alpha, blue, green, red).

你看看下面是否合适：

struct PIXEL128F
{
PIXEL128F()
{
  r = 0.0f;
  g = 0.0f;
  b = 0.0f;
  a = 0.0f;
}
float r,
float g,
float b,
float a
}
...
memcpy(&pixel, lpPixelBuffer, 16);
...

akira32

???一下lpPixelBuffer如何去?算?

tonykee

你的代码里面的lrect_New2.pBits不就是吗，我代码省略了前后的循环部分，你自己想想嘛。

akira32

???我解?Q了,感?tonykee的?兔
列出我最?的程式?,大家如果有遇到一?拥???可以?⒖家幌

<1>?於D3DFMT_A32B32G32R32F的?取pixel的程式?如下:

1. 
   
2.         IDirect3DTexture9 *g_pTexture2;
   
3.         D3DXCreateTextureFromFile(g_pD3DDevice, "eyefortest.png", &g_pTexture2);
   
4. 
   
5.         HRESULT hr;
   
6. 
   
7.         D3DLOCKED_RECT LockedRect;
   
8.         D3DSURFACE_DESC Desc;
   
9. 
   
10.         hr = g_pTexture2->GetLevelDesc(0,&Desc);//D3DFMT_A32B32G32R32F
    
11.         hr = g_pTexture2->LockRect(0,&LockedRect,NULL,0);
    
12. 
    
13.         D3DXVECTOR4 *pbits = (D3DXVECTOR4 *) LockedRect.pBits;
    
14.         D3DXVECTOR4 vec4;
    
15. 
    
16.         //int index=0;
    
17. 
    
18.         for (UINT y=0;y<Desc.Height;y++)
    
19.         {
    
20.                 DWORD dwOffset = y*Desc.Width;
    
21.                 for (UINT x=0;x<Desc.Width;x++)
    
22.                 {
    
23.                         vec4=pbits[dwOffset+x];
    
24.                 }
    
25.         }
    
26. 
    
27.         hr = g_pTexture2->UnlockRect(0);
    

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<2>?於D3DFMT_X8R8G8B8的?取pixel的程式?如下:

1. 
   
2.         HRESULT hr;
   
3. 
   
4.         D3DLOCKED_RECT LockedRect;
   
5.         D3DSURFACE_DESC Desc;
   
6. 
   
7.         hr = g_pTexture->GetLevelDesc(0,&Desc);//D3DFMT_X8R8G8B8
   
8.         hr = g_pTexture->LockRect(0,&LockedRect,NULL,0);
   
9. 
   
10.         DWORD *pbits = (DWORD *) LockedRect.pBits;
    
11. 
    
12.         for (UINT y=0;y<Desc.Height;y++)
    
13.         {
    
14.                 DWORD dwOffset = y*Desc.Width;
    
15.                 for (UINT x=0;x<Desc.Width;x++)
    
16.                 {
    
17.                         DWORD rgb=pbits[dwOffset+x];
    
18. 
    
19.                         DWORD b=LOBYTE(rgb);
    
20.                         DWORD g=(LOBYTE(((WORD)(rgb)) >> 8));
    
21.                         DWORD r=(LOBYTE((rgb)>>16));
    
22.                         DWORD a=(LOBYTE((rgb)>>24));
    
23. 
    
24.                         //GetRValue
    
25.                         int c=12;
    
26.                 }
    
27.         }
    
28. 
    
29.         hr = g_pTexture->UnlockRect(0);
    

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