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Merge pull request #1651 from marauder2k9-torque/development
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Update bitmapUtils.h
This commit is contained in:
Brian Roberts 2026-01-05 21:06:44 -06:00 committed by GitHub
parent 199ca6b3af 1b528b818e
commit 55f7b227f0
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GPG key ID: B5690EEEBB952194
1 changed files with 49 additions and 41 deletions
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90
Engine/source/gfx/bitmap/bitmapUtils.h
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@ -61,45 +61,39 @@ inline F32 convertHalfToFloat(U16 h)
U32 exp = (h >> 10) & 0x0000001F;
U32 mant = h & 0x000003FF;
U32 outSign = sign << 31;
U32 outExp, outMant;
U32 out;
if (exp == 0)
{
if (mant == 0)
{
// Zero
outExp = 0;
outMant = 0;
out = sign;
}
else
{
// Subnormal number -> normalize
exp = 1;
while ((mant & 0x00000400) == 0)
exp = 127 - 14;
while ((mant & 0x0400) == 0)
{
mant <<= 1;
exp -= 1;
exp--;
}
mant &= 0x000003FF;
outExp = (exp + (127 - 15)) << 23;
outMant = mant << 13;
mant &= 0x03FF;
out = sign | (exp << 23) | (mant << 13);
}
}
else if (exp == 31)
{
// Inf or NaN
outExp = 0xFF << 23;
outMant = mant ? (mant << 13) : 0;
out = sign | 0x7F800000 | (mant << 13);
}
else
{
// Normalized
outExp = (exp + (127 - 15)) << 23;
outMant = mant << 13;
out = sign | ((exp + (127 - 15)) << 23) | (mant << 13);
}
U32 out = outSign | outExp | outMant;
F32 result;
dMemcpy(&result, &out, sizeof(F32));
return result;
@ -110,40 +104,54 @@ inline U16 convertFloatToHalf(F32 f)
U32 bits;
dMemcpy(&bits, &f, sizeof(U32));
U32 sign = (bits >> 16) & 0x00008000;
U32 exp = ((bits >> 23) & 0x000000FF) - (127 - 15);
U32 sign = (bits >> 16) & 0x8000;
U32 exp = (bits >> 23) & 0xFF;
U32 mant = bits & 0x007FFFFF;
if (exp <= 0)
{
if (exp < -10)
return (U16)sign; // Too small => 0
mant = (mant | 0x00800000) >> (1 - exp);
return (U16)(sign | (mant >> 13));
}
else if (exp == 0xFF - (127 - 15))
if (exp == 255)
{
// Inf or NaN
if (mant == 0)
{
// Inf
return (U16)(sign | 0x7C00);
}
else
{
// NaN
mant >>= 13;
return (U16)(sign | 0x7C00 | mant | (mant == 0));
}
mant >>= 13;
return (U16)(sign | 0x7C00 | mant | (mant == 0));
}
else
S32 newExp = (S32)exp - 127 + 15;
if (newExp >= 31)
{
if (exp > 30)
{
// Overflow => Inf
return (U16)(sign | 0x7C00);
}
return (U16)(sign | (exp << 10) | (mant >> 13));
// Overflow → Inf
return (U16)(sign | 0x7C00);
}
else if (newExp <= 0)
{
// Subnormal or underflow
if (newExp < -10)
return (U16)sign;
mant |= 0x800000;
U32 shifted = mant >> (1 - newExp);
// Round to nearest-even
if (shifted & 0x00001000)
shifted += 0x00002000;
return (U16)(sign | (shifted >> 13));
}
// Normalized with rounding
mant += 0x00001000;
if (mant & 0x00800000)
{
mant = 0;
newExp++;
}
if (newExp >= 31)
return (U16)(sign | 0x7C00);
return (U16)(sign | (newExp << 10) | (mant >> 13));
}
// Convert a single 16-bit value (0..65535) to 8-bit (0..255)