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mask+mask bugfix

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This commit is contained in:
Ryan Oldenburg 2021-02-13 16:03:09 -06:00
parent 2c959cd231
commit 4a9c26d4ff
1 changed files with 3 additions and 10 deletions
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13
src/pixie/blends.nim
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@ -622,24 +622,17 @@ when defined(amd64) and not defined(pixieNoSimd):
proc maskMaskSimd*(backdrop, source: M128i): M128i =
let
oddMask = mm_set1_epi16(cast[int16](0xff00))
v255high = mm_set1_epi16(cast[int16](255.uint16 shl 8))
div255 = mm_set1_epi16(cast[int16](0x8081))
var
sourceEven = mm_slli_epi16(mm_andnot_si128(oddMask, source), 8)
sourceOdd = mm_and_si128(source, oddMask)
let
evenK = mm_sub_epi16(v255high, sourceEven)
oddK = mm_sub_epi16(v255high, sourceOdd)
var
backdropEven = mm_slli_epi16(mm_andnot_si128(oddMask, backdrop), 8)
backdropOdd = mm_and_si128(backdrop, oddMask)
# backdrop * k
backdropEven = mm_mulhi_epu16(backdropEven, evenK)
backdropOdd = mm_mulhi_epu16(backdropOdd, oddK)
# backdrop * source
backdropEven = mm_mulhi_epu16(backdropEven, sourceEven)
backdropOdd = mm_mulhi_epu16(backdropOdd, sourceOdd)
# div 255
backdropEven = mm_srli_epi16(mm_mulhi_epu16(backdropEven, div255), 7)