dos33fsprogs/graphics/gr/rotozoom/plasma.s
Vince Weaver 278dfb9c3f rotoplasma: optimize some more
about 6fps

theoretical max might be around 10fps
2021-01-11 12:50:14 -05:00

173 lines
2.0 KiB
ArmAsm

texture = $d00
high_lookup = $e00
low_lookup = $f00
;col = ( 8.0 + (sintable[xx&0xf])
; + 8.0 + (sintable[yy&0xf])
; ) / 2;
init_plasma_texture:
ldy #15
create_yloop:
ldx #15
create_xloop:
clc
lda #15
adc sinetable,X
adc sinetable,Y
lsr
lookup_smc:
sta texture ; always starts at $d00
inc lookup_smc+1
dex
bpl create_xloop
dey
bpl create_yloop
rts
;==============================
; update plasma
update_plasma:
cycle_colors:
; cycle colors
ldx #0
cycle_texture_loop:
inc texture,X
lda texture,X ; slow here but faster than doing it
and #$f ; in the draw routine
sta texture,X
inx
bne cycle_texture_loop
; make lookup
ldx #0
cycle_lookup_loop:
lda texture,X
lsr
tay
color_lookup_smc:
lda green_lookup,Y
pha
and #$f0
sta high_lookup,X
pla
and #$0f
sta low_lookup,X
inx
bne cycle_lookup_loop
rts
.if 0
plot_frame:
; plot frame
ldx #47 ; YY=0
plot_yloop:
txa ; get (y&0xf)<<4
pha ; save YY
asl
asl
asl
asl
sta CTEMP
txa
lsr
ldy #$0f ; setup mask
bcc plot_mask
ldy #$f0
plot_mask:
sty MASK
jsr GBASCALC ; point GBASL/H to address in A
; after, A trashed, C is clear
;==========
ldy #39 ; XX = 39 (countdown)
plot_xloop:
tya ; get x&0xf
and #$f
ora CTEMP ; get ((y&0xf)*16)+x
tax
plot_lookup:
; sta plot_lookup_smc+1
plot_lookup_smc:
lda lookup,X ; load lookup, (y*16)+x
; lda lookup ; load lookup, (y*16)+x
and #$f
lsr
tax
lda colorlookup,X
sta COLOR
jsr PLOT1 ; plot at GBASL,Y (x co-ord in Y)
dey
bpl plot_xloop
pla
tax ; restore YY
dex
bpl plot_yloop
bmi forever_loop
.endif
which_color: .byte $0
colorlookup:
.word green_lookup,yellow_lookup,blue_lookup,red_lookup
; blue
blue_lookup:
.byte $55,$22,$66,$77,$ff,$77,$55,$00
; red
red_lookup:
.byte $55,$11,$33,$bb,$ff,$bb,$55,$00
; green
green_lookup:
.byte $55,$44,$cc,$ee,$ff,$ee,$55,$00
; yellow
yellow_lookup:
.byte $55,$88,$99,$dd,$ff,$dd,$55,$00
sinetable:
.byte $00,$03,$05,$07,$08,$07,$05,$03
.byte $00,$FD,$FB,$F9,$F8,$F9,$FB,$FD