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use floating-point division in mipmap generation

This commit is contained in:
cxgeorge 2001-06-29 02:25:19 +00:00
parent 4f696cec1e
commit bdb754b257
1 changed files with 12 additions and 2 deletions
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14
panda/src/dxgsg/dxTextureContext.cxx
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@ -1669,9 +1669,16 @@ FillDDSurfTexturePixels(void) {
DWORD src_row_bytelength=oldcurxsize*cPixelSize;
DWORD two_src_row_bytelength=2*src_row_bytelength;
#ifdef GENMIPMAP_DO_INTEGER_DIV
DWORD DivShift=2;
if((oldcurxsize==1)||(oldcurysize==1))
DivShift = 1;
#else
float numpixels_per_filter=4.0f;
if((oldcurxsize==1)||(oldcurysize==1))
numpixels_per_filter=2.0f;
#endif
DWORD x_srcptr_inc = ((oldcurxsize==1)? cPixelSize: (2*cPixelSize));
// box-filter shrink down, avg 4 pixels at a time
@ -1691,8 +1698,11 @@ FillDDSurfTexturePixels(void) {
if(oldcurxsize>1)
colr += *(pSrcWord+src_row_bytelength+cPixelSize+c);
}
colr >>= DivShift;
#ifdef GENMIPMAP_DO_INTEGER_DIV
colr >>= DivShift;
#else
colr = (DWORD) ((((float)colr)/numpixels_per_filter)+0.5f);
#endif
*(pDstWord+c)=(BYTE)colr;
}