设置 DirectX9 表面像素

发布于 2024-11-03 05:00:17 字数 629 浏览 2 评论 0原文

我试图在 D3DSURFACE9 中设置各个像素，但它们到处都是。我想我以前也这样做过，但这次似乎做不好。

3DLOCKED_RECT lrt;
if(D3D_OK == lpThis->sfRenderingCanvas->LockRect(&lrt,NULL,0))
{
   UINT pitch = lrt.Pitch;
   VOID *data;
   data = lrt.pBits;
   UINT Y = (UINT)xmsg.Y;
   UINT X = (UINT)xmsg.X;
   for(int z=0;xmsg.iNum;z++)
   {
      if( xmsg.iDataBlock[z]>0 )
         ((DWORD*)data)[X+Y*pitch+z] = 0xFFFFFF00;
      else
         ((DWORD*)data)[X+Y*pitch+z] = 0xFF000000;
      }
   }
}

Y 介于 0 和创建曲面时使用的高度之间
X 介于 0 和表面的节距之间

有人能告诉我我做错了什么吗？而且，它的高度似乎是我的窗户的两倍。（^如果我尝试绘制超过 1/4 的行，它会覆盖其中的 1/2。）

原文

I'm trying to set the individual pixels in a D3DSURFACE9 but they're going all over the place.
I think I've done this before but can't seem to get it right this time.

3DLOCKED_RECT lrt;
if(D3D_OK == lpThis->sfRenderingCanvas->LockRect(&lrt,NULL,0))
{
   UINT pitch = lrt.Pitch;
   VOID *data;
   data = lrt.pBits;
   UINT Y = (UINT)xmsg.Y;
   UINT X = (UINT)xmsg.X;
   for(int z=0;xmsg.iNum;z++)
   {
      if( xmsg.iDataBlock[z]>0 )
         ((DWORD*)data)[X+Y*pitch+z] = 0xFFFFFF00;
      else
         ((DWORD*)data)[X+Y*pitch+z] = 0xFF000000;
      }
   }
}

Y is between 0 and the height used when creating the surface
X is between 0 and the pitch of the surface

Can anybody tell what I'm doing wrong?
Also, it seems to go about twice as far down as my window.
(^If I try to draw over 1/4 the rows, it covers 1/2 of them.)

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怪我闹别瞎闹 2024-11-10 05:00:17

D3DLOCKED_RECT 是每行开头之间的字节数，而不是 DWORD 数。您使用 DWORD 指针对缓冲区进行索引，因此您实际上使用了四倍大的间距。

尝试这样的事情......

DWORD * row = (DWORD *)((char *)lrt.pBits + pitch * Y);
for(int z=0;xmsg.iNum;z++)
{
   if( xmsg.iDataBlock[z]>0 )
      row[X+z] = 0xFFFFFF00;
   else
      row[X+z] = 0xFF000000;
   }
}

The pitch value that comes back in the D3DLOCKED_RECT is the number of bytes between the start of each row, not the number of DWORDs. You're indexing into the buffer using a DWORD pointer, so you are effectively using a pitch four times too large.

Try something like this...

DWORD * row = (DWORD *)((char *)lrt.pBits + pitch * Y);
for(int z=0;xmsg.iNum;z++)
{
   if( xmsg.iDataBlock[z]>0 )
      row[X+z] = 0xFFFFFF00;
   else
      row[X+z] = 0xFF000000;
   }
}

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