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optimized gfx2.plot() for hires-4c

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This commit is contained in:
Irmen de Jong 2021-04-28 02:39:35 +02:00
parent 7f0e25cb50
commit 2575263438
2 changed files with 18 additions and 8 deletions
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25
compiler/res/prog8lib/cx16/gfx2.p8
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@ -277,9 +277,9 @@ _done
ora colorbits,y
sta cx16.VERA_DATA0
cpy #%00000011 ; next vera byte?
bne +
bne + ; TODO should be ++?
inc cx16.VERA_ADDR_L
bne +
bne + ; TODO should be ++?
inc cx16.VERA_ADDR_M
+ bne +
inc cx16.VERA_ADDR_H
@ -634,13 +634,24 @@ _done
6 -> {
; highres 4c
; TODO also mostly usable for lores 4c?
; TODO get rid of all the vpoke calls to optimize all plot() ?
void addr_mul_24_for_highres_4c(y, x) ; 24 bits result is in r0 and r1L (highest byte)
cx16.r2L = lsb(x) & 3 ; xbits
color &= 3
color <<= shift4c[lsb(x) & 3]
cx16.VERA_ADDR_H &= %00000111 ; no auto advance
ubyte value2 = cx16.vpeek(lsb(cx16.r1), cx16.r0) & mask4c[lsb(x) & 3] | color
cx16.vpoke(lsb(cx16.r1), cx16.r0, value2)
color <<= shift4c[cx16.r2L]
%asm {{
stz cx16.VERA_CTRL
lda cx16.r1L
sta cx16.VERA_ADDR_H
lda cx16.r0H
sta cx16.VERA_ADDR_M
lda cx16.r0L
sta cx16.VERA_ADDR_L
ldy cx16.r2L ; xbits
lda mask4c,y
and cx16.VERA_DATA0
ora color
sta cx16.VERA_DATA0
}}
}
}
}

1
examples/test.p8
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@ -14,7 +14,6 @@ main {
ubyte yy
uword rw
; 520 jiffies (hires 4c)
repeat 20000 {
rw = rndw()
yy = (lsb(rw) & 127) + 20