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topti: fix C_LIGHTEN and C_DARKEN 

Light and dark were erroneously swapped in my documentation's
formulae, but not in the way operands were cancelled when x=0,
leading to strange results.
This commit is contained in:
lephe 2019-07-27 19:49:39 -04:00
parent 144ff90e37
commit 1906329552
1 changed files with 27 additions and 20 deletions
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47
src/render-fx/topti-asm.s
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@ -24,7 +24,7 @@
.align 4
_topti_asm_white:
add #-16, r4
add #-16, r5
nop
1: mov.l @r6+, r0
add #16, r4
@ -35,9 +35,9 @@ _topti_asm_white:
and r0, r1
and r0, r2
mov.l r1, @r4
add #16, r5
bf.s 1b
mov.l r2, @r5
bf.s 1b
add #16, r5
rts
nop
@ -74,11 +74,14 @@ _topti_asm_dark:
mov.l r2, @r5
and r0, r1
/* (bubble) */
mov.l r1, @r5
mov.l r1, @r4
add #16, r4
bf.s 1b
add #16, r5
rts
nop
.align 4
_topti_asm_black:
1: mov.l @r6+, r0
@ -107,10 +110,14 @@ _topti_asm_invert:
1: mov.l @r6+, r0
dt r7
mov.l @r4, r1
xor r1, r0
mov.l r0, @r4
bf.s 1b
xor r0, r1
mov.l @r5, r2
xor r0, r2
mov.l r1, @r4
add #16, r4
mov.l r2, @r5
bf.s 1b
add #16, r5
rts
nop
@ -125,17 +132,17 @@ _topti_asm_lighten:
mov.l @r5, r2
add #16, r4
mov.l @r4, r1
mov r2, r3
mov r1, r3
xor r0, r3
not r0, r0
or r0, r2
and r1, r2
mov.l r2, @r1
dt r7
or r0, r1
and r3, r1
and r2, r1
mov.l r1, @r5
dt r7
or r0, r2
and r3, r2
bf.s 1b
mov.l r2, @r4
rts
nop
@ -150,17 +157,17 @@ _topti_asm_darken:
mov.l @r5, r2
add #16, r4
mov.l @r4, r1
mov r2, r3
mov r1, r3
xor r0, r3
and r0, r2
or r1, r2
dt r7
mov.l r2, @r4
and r0, r1
or r3, r1
/* (bubble) */
or r2, r1
dt r7
mov.l r1, @r5
and r0, r2
or r3, r2
/* (bubble) */
bf.s 1b
mov.l r2, @r4
rts
nop