KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

glsl: Add "built-in" functions to do uint_to_fp64(uint) 

Signed-off-by: Elie Tournier <elie.tournier@collabora.com>
This commit is contained in:
Elie Tournier 2017-08-09 11:41:13 +01:00 committed by Matt Turner
parent a3551ee61f
commit cbf090b809
1 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
src/compiler/glsl/float64.glsl
View File

@ -858,3 +858,25 @@ __fp64_to_uint(uint64_t a)
return mix(z, expt, (aSign != 0u) && (z != 0u));
}
uint64_t
__uint_to_fp64(uint a)
{
if (a == 0u)
return 0ul;
int shiftDist = __countLeadingZeros32(a) + 21;
uint aHigh = 0u;
uint aLow = 0u;
int negCount = (- shiftDist) & 31;
aHigh = mix(0u, a<< shiftDist - 32, shiftDist < 64);
aLow = 0u;
aHigh = mix(aHigh, 0u, shiftDist == 0);
aLow = mix(aLow, a, shiftDist ==0);
aHigh = mix(aHigh, a >> negCount, shiftDist < 32);
aLow = mix(aLow, a << shiftDist, shiftDist < 32);
return __packFloat64(0u, 0x432 - shiftDist, aHigh, aLow);
}