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support negative exponent

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This commit is contained in:
Ian Curtis 2016-06-03 09:33:46 +00:00
parent 5081ee99dc
commit 8440bc7f03
1 changed files with 9 additions and 1 deletions
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10
Src/Graphics/New3D/New3D.cpp
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@ -1177,8 +1177,16 @@ void CNew3D::CalcTexOffset(int offX, int offY, int page, int x, int y, int& newX
UINT32 CNew3D::ConvertProFloat(UINT32 a1)
{
int exponent = ((a1 & 0x7E000000) >> 25) + 127;
int exponent = (a1 & 0x7E000000) >> 25;
if (exponent <= 31) { // positive
exponent += 127;
}
else { // negative exponent
exponent -= 64;
exponent += 127;
}
int mantissa = (a1 & 0x1FFFFFF) >> 2;
return (a1 & 0x80000000) | (exponent << 23) | mantissa;