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dos33fsprogs
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tfv: update rotozoom code to newest

This commit is contained in:
Vince Weaver 2021-01-20 16:41:19 -05:00
parent 78cb19fe7a
commit 5ab04b5cb3
1 changed files with 9 additions and 7 deletions
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16
games/tfv/rotozoom.s
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@ -22,6 +22,7 @@
; $39dc9=237,001= change to use common lookup table (outside inner loop)
; $3399f=211,359=4.73fps unroll the Y loop by one
; $2BA83=178,819=5.59fps optimize unrolled loop
; $2B14B=176,459=5.66fps avoid extra jump (qkumba)
CAL = $C0
CAH = $C1
@ -263,13 +264,7 @@ roto_color_even_smc:
; carry was set a bit before to low bit of YPH
; hopefully nothing has cleared it
bcs rscrn_adjust_odd ; 2nt/3
rscrn_adjust_even:
; YP was even so want bottom nibble
and #$f ; 2
jmp rscrn_done ; 3
bcc rscrn_adjust_even ; 2nt/3
rscrn_adjust_odd:
; YP was odd so want top nibble
@ -278,6 +273,13 @@ rscrn_adjust_odd:
lsr ; 2
lsr ; 2
; fall through
rscrn_adjust_even:
; YP was even so want bottom nibble
and #$f ; 2
rscrn_done: