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DEVICE ZXSPECTRUM128
include "../../_sdk/sys_h.asm"
SCRHGT=192
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
org PROGSTART
begin
ld sp,0x4000 ;╨╜╨╡ ╨┤╨╛╨╗╨╢╨╡╨╜ ╨╛╨┐╤Г╤Б╨║╨░╤В╤М╤Б╤П ╨╜╨╕╨╢╨╡ 0x3b00! ╨╕╨╜╨░╤З╨╡ ╨▓╨╛╨╖╨╝╨╛╨╢╨╜╨░ ╨┐╨╛╤А╤З╨░ OS
ld hl,1234
OS_HIDEFROMPARENT
ld e,0+0x80 ;EGA + keep gfx pages
OS_SETGFX ;e=0:EGA, e=2:MC, e=3:6912, e=6:text ;+SET FOCUS ;e=-1: disable gfx (out: e=old gfxmode)
ld e,0
OS_CLS
ld a,(user_scr0_low)
SETPG8000
ld a,(user_scr0_high)
SETPGC000
call start
YIELDGETKEYLOOP
QUIT
;General Mandelbrot calculation idea was taken from https://www.pouet.net/prod.php?which=87739
;(C) litwr 2021
;Thanks to reddie for some help with optimization
;for pasmo assembler
;128x256 Mandelbrot for the Amstrad CPC, 16 color mode
;SCR_SET_MODE EQU #BC0E
;SCR_SET_INK EQU #BC32
;KM_WAIT_CHAR EQU #BB06
start
sqrbase equ 0x6000 ;must be $xx00
initer equ 7
idx equ -36 ;-.0703125
idy equ 18 ;.03515625
ix0 equ -62*idx
imx equ 10*idx ; x move
sf4 equ 436/4 ; sf/4
ld hl,sqrbase
;push hl
ld bc,0
ld de,0
sqrloop:
;pop hl
ld (hl),c
inc l
ld (hl),b
inc hl
push hl
inc e
push de
ld h,d
ld l,e
add hl,hl
ld d,l
ld e,h
ld a,e
r0l:
ld hl,0
add hl,de
ld (r0l+1),hl
adc a,c
ld c,a
ld a,0
adc a,b
ld b,a
r4l:
ld hl,sqrbase
dec hl
ld (hl),b
dec l
ld (hl),c
ld (r4l+1),hl
pop de
pop hl
;jr c,mandel0
inc de
jr nc,sqrloop
;mandel0:
;pop hl
mandel:
ld ixl,0
ld hl,0x8000;$c040 ;scrtop
ld c,SCRHGT
exx;push hl
ld hl,(dy)
ld a,h
ld h,l
srl h
rra
ld l,a ;dy*128
ld (r5),hl
loop0:
exx
ld b,160;40
exx
x0=$+1
ld hl,ix0
ld (r4),hl
loop2:
ld hl,(r4)
ld de,(dx)
sra d
rr e
add hl,de
ld (r4),hl
ld b,h
ld c,l ;r0
niter=$+2
ld ixh,initer
ld hl,(r5)
loc1:
ld d,h
ld e,l
res 0,l
ld a,sqrbase/256
add a,h
ld h,a
ld a,(hl)
inc l
ld h,(hl)
ld l,a
ex de,hl ;de = r3 = sqr[r1&0xfffe]
add hl,bc ;r1 += r0
ld a,b
ld b,h
ld h,a
ld a,c
ld c,l
ld l,a
res 0,l
ld a,sqrbase/256
add a,h
ld h,a
ld a,(hl)
inc l
ld h,(hl)
ld l,a ;r0 = sqr[r0&0xfffe]
add hl,de
ld a,h
cp 8
jr nc,loc2
push hl ;r0 += r3
ld h,b
ld l,c
ld a,sqrbase/256
add a,h
ld h,a
res 0,l
ld a,(hl)
inc l
ld h,(hl)
ld l,a ;r1 = sqr[r1&0xfffe]
r5=$+1
ld bc,0
add hl,bc ;add r5, r1 ;sets C=0
pop bc ;r0
sbc hl,bc ;sub r0, r1
push hl
r4=$+1
ld hl,0
add hl,bc ;r0 += r4
sbc hl,de ;r0 -= r3
sbc hl,de
ld b,h ;r0 -= r3
ld c,l
pop hl
dec ixh
jr nz,loc1
loc2:
ld a,ixh ;color
and 15 ;16 colors
ld hl,c8t
add a,l
ld l,a
ld a,(hl)
;ld c,(hl)
;ld a,ixl
;xor 1
;ld ixl,a
;jp nz,lx1
;tcolor=$+1
; ld a,0
; or c
exx;pop hl ;scrtop
;dec hl
ld (hl),a
ld a,h
xor 0x40
ld h,a
bit 6,h
jr nz,nextpixelq
xor 0x20
ld h,a
and 0x20
jr nz,$+3
inc hl
nextpixelq
dec b
exx;push hl
;ld c,a
;ld a,$3f
;xor h
;ld h,a
;ld a,$c0
;xor l
;ld l,a
;ld (hl),c
;ld a,l
;and $3f
jp nz,loop2
;next line
;exx;pop hl ;scrtop
;ld de,40;$840
;add hl,de
;jr nc,lx10
;ld de,$c040
;add hl,de
;lx10:
;exx;push hl
ld de,(dy)
ld hl,(r5)
sbc hl,de ;it seems, C=0 is always here
ld (r5),hl
exx
dec c
exx
jp nz,loop0
;next frame
ld hl,(x0)
ld de,(mx)
add hl,de
ld (x0),hl ;x0 += mx
ld hl,niter
inc (hl) ;iter++
ld hl,dx
;push hl
lx5:
;pop hl
ld a,l
cp (mx&0xff)+2
jp z,lx2 ;╨┐╨╡╤А╨╡╨▒╨╕╤А╨░╨╡╨╝ dx, dy, mx
ld (dx1p),a
ld (dx2p),a
;add a,2
;ld l,a
push hl
ld de,sqrbase-sf4
dx1p=$+1
ld hl,(dx)
push hl
add hl,de
res 0,l
ld c,(hl)
inc l
ld b,(hl)
ld de,sqrbase+sf4
pop hl
add hl,de
res 0,l
or a ;sets C=0
ld a,(hl)
inc l
ld h,(hl)
ld l,a
sbc hl,bc ;C=0
dx2p=$+1
ld (dx),hl
pop hl
inc hl
inc hl
jr lx5
lx2:
;pop hl
;call KM_WAIT_CHAR
jp mandel
;lx1:ld a,c
; rrca
; ld (tcolor),a
; jp loop2
dx: dw idx
dy: dw idy
mx: dw imx
c8t: ;db 0, 8, $22, $88, $2a, $28, 2, $8a
;db $80, $20, $a0, $a8, $82, $a2, $aa, $a
_=0
dup 8
db _*9
_=_+1
edup
_=0
dup 8
db _*9+0xc0
_=_+1
edup
end
display "End=",end
display "Free after end=",/d,#c000-end
display "Size ",/d,end-begin," bytes"
savebin "mandelbr.com",begin,end-begin
LABELSLIST "../../../us/user.l"