pyrex/chameleonic
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replace comparisons with bit math bullshit

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integers in the range [0, 15] fit entirely in the bit mask 0x000F. integers out of that range will have at least one bit 0x0010 or higher, or will have the sign bit 0x8000 set. so to find out if one of two numbers is out of range [0, 15], we can check the bit mask of their bitwise or.

this saves tokens and cycles. it is also completely illegible. very in the spirit of Pico-8, I love it.
This commit is contained in:
Kistaro Windrider 2022-12-22 22:49:27 -08:00
parent 10948ce4a5
commit fe3a68284f
Signed by: kistaro
SSH Key Fingerprint: SHA256:TBE2ynfmJqsAf0CP6gsflA0q5X5wD5fVKWPsZ7eVUg8
1 changed files with 1 additions and 1 deletions
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chameleonic.p8
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@ -438,7 +438,7 @@ function level:spawn_exit()
if (self:_mget(x,y)!=18) return if (self:_mget(x,y)!=18) return
for nx=x-1,x+1 do for nx=x-1,x+1 do
for ny=y-1,y+1 do for ny=y-1,y+1 do
if nx<0 or ny<0 or nx>15 or ny>15 then if (nx | ny) & 0xFFF0 ~= 0 then
self._wins[_mix(nx,ny)]=true self._wins[_mix(nx,ny)]=true
end end
end end