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glsl: Add "built-in" functions to do trunc(fp64)

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v2: use mix.

Signed-off-by: Elie Tournier <elie.tournier@collabora.com>
This commit is contained in:
Elie Tournier
2017-08-11 14:09:01 +01:00
committed by Matt Turner
parent 2119094b1d
commit 48891ab441
1 changed files with 22 additions and 0 deletions
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22
src/compiler/glsl/float64.glsl
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@@ -1355,3 +1355,25 @@ __fsqrt64(uint64_t a)
__shift64ExtraRightJamming(zFrac0, zFrac1, 0u, 10, zFrac0, zFrac1, zFrac2);
return __roundAndPackFloat64(0u, zExp, zFrac0, zFrac1, zFrac2);
}
uint64_t
__ftrunc64(uint64_t __a)
{
uvec2 a = unpackUint2x32(__a);
int aExp = __extractFloat64Exp(__a);
uint zLo;
uint zHi;
int unbiasedExp = aExp - 1023;
int fracBits = 52 - unbiasedExp;
uint maskLo = mix(~0u << fracBits, 0u, fracBits >= 32);
uint maskHi = mix(~0u << (fracBits - 32), ~0u, fracBits < 33);
zLo = maskLo & a.x;
zHi = maskHi & a.y;
zLo = mix(zLo, 0u, unbiasedExp < 0);
zHi = mix(zHi, 0u, unbiasedExp < 0);
zLo = mix(zLo, a.x, unbiasedExp > 52);
zHi = mix(zHi, a.y, unbiasedExp > 52);
return packUint2x32(uvec2(zLo, zHi));
}