mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-28 09:30:41 +00:00
627 lines
12 KiB
ArmAsm
627 lines
12 KiB
ArmAsm
|
|
; rotozoomer!
|
|
; takes a lores-formatted image in $c00 and rotozooms it
|
|
; by ANGLE and SCALE_I/SCALE_F and draws it to the
|
|
; lo-res page in DRAW_PAGE
|
|
|
|
; ANGLE in our case is 0..31
|
|
; SCALE_I/SCALE_F is 8.8 fixed point scale multiplier
|
|
|
|
; optimization (cycles measured at ANGLE=0)
|
|
; $6BD76=441,718=2.26fps initial code with external plot and scrn
|
|
; $62776=403,318=2.48fps inline plot
|
|
; $597b6=366,518=2.73fps inline scrn
|
|
; $4F496=324,758=3.08fps move plot line calc outside of inner loop
|
|
; $49d16=302,358=3.31fps do color*17 ourselves
|
|
; $4645e=287,838=3.47fps move XX into X
|
|
; $3ef7e=257,918=3.87fps optimize plot
|
|
; $3c9fe=248,318=4.03fps optimize scrn
|
|
; $39e3e=237,118=4.22fps add scrn address lookup table
|
|
; $39fdf=237,535 add two scale multiplies
|
|
; $39e17=237,079=4.22fps change the init to also use multiply
|
|
; $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
|
|
SAL = $C2
|
|
SAH = $C3
|
|
YPL = $C4
|
|
YPH = $C5
|
|
XPL = $C6
|
|
XPH = $C7
|
|
CCAL = $C8
|
|
CCAH = $C9
|
|
CSAL = $CA
|
|
CSAH = $CB
|
|
YCAL = $CC
|
|
YCAH = $CD
|
|
YSAL = $CE
|
|
YSAH = $CF
|
|
|
|
rotozoom:
|
|
|
|
; setup scale for multiply
|
|
|
|
lda SCALE_I ; 3
|
|
sta NUM1H ; 3
|
|
lda SCALE_F ; 3
|
|
sta NUM1L ; 3
|
|
|
|
; ca = cos(theta)*scale;
|
|
; (we use equiv ca=fixed_sin[(theta+8)&0xf] )
|
|
|
|
lda ANGLE ; 3
|
|
clc ; 2
|
|
adc #8 ; 2
|
|
and #$1f ; 2
|
|
asl ; 2
|
|
tay ; 2
|
|
lda fixed_sin,Y ; load integer half ; 4
|
|
sta NUM2H ; 3
|
|
lda fixed_sin+1,Y ; load float half ; 4
|
|
sta NUM2L ; 3
|
|
;===========
|
|
; 27
|
|
|
|
sec ; reload NUM1H/NUM1L ; 2
|
|
jsr multiply ; 6+???
|
|
stx CAH ; 3
|
|
sta CAL ; 3
|
|
|
|
|
|
; sa = sin(theta)*scale;
|
|
|
|
lda ANGLE ; 3
|
|
asl ; 2
|
|
tay ; 2
|
|
lda fixed_sin,Y ; load integer half ; 4
|
|
sta NUM2H ; 3
|
|
lda fixed_sin+1,Y ; load integer half ; 4
|
|
sta NUM2L ; 3
|
|
;==========
|
|
; 21
|
|
|
|
|
|
clc ; NUM1H/NUM1L same as last time ; 2
|
|
jsr multiply ; 6+???
|
|
|
|
stx SAH ; 3
|
|
sta SAL ; 3
|
|
|
|
|
|
; cca = -20*ca;
|
|
|
|
lda #<(-20) ; 2
|
|
sta NUM1H ; 3
|
|
lda #0 ; 2
|
|
sta NUM1L ; 3
|
|
|
|
lda CAL ; 3
|
|
sta NUM2L ; 3
|
|
lda CAH ; 3
|
|
sta NUM2H ; 3
|
|
|
|
sec ; reload NUM1H/NUM1L ; 2
|
|
jsr multiply ; 6+???
|
|
stx CCAH ; 3
|
|
sta CCAL ; 3
|
|
|
|
|
|
; csa = -20*sa;
|
|
|
|
lda SAL ; 3
|
|
sta NUM2L ; 3
|
|
lda SAH ; 3
|
|
sta NUM2H ; 3
|
|
|
|
clc ; same NUM1H/NUM1L as las time ; 2
|
|
jsr multiply ; 6+???
|
|
|
|
stx CSAH ; 3
|
|
sta CSAL ; 3
|
|
|
|
|
|
; yca=cca+ycenter;
|
|
|
|
lda CCAL ; 3
|
|
sta YCAL ; 3
|
|
clc ; 2
|
|
lda CCAH ; 3
|
|
adc #20 ; 2
|
|
sta YCAH ; 3
|
|
;===========
|
|
; 16
|
|
; ysa=csa+xcenter;
|
|
|
|
lda CSAL ; 3
|
|
sta YSAL ; 3
|
|
clc ; 2
|
|
lda CSAH ; 3
|
|
adc #20 ; 2
|
|
sta YSAH ; 3
|
|
;===========
|
|
; 16
|
|
|
|
; yloop, unrolled once
|
|
;===================================================================
|
|
; for(yy=0;yy<40;yy++) {
|
|
;===================================================================
|
|
|
|
ldy #0 ; 2
|
|
sty YY ; 3
|
|
|
|
rotozoom_yloop:
|
|
|
|
; setup self-modifying code for plot
|
|
; YY already in Y from end of loop
|
|
; ldy YY ; 3
|
|
|
|
lda common_offsets_l,Y ; lookup low-res memory address ; 4
|
|
sta rplot2_smc+1 ; 4
|
|
sta rplot12_smc+1 ; 4
|
|
sta rplot22_smc+1 ; 4
|
|
|
|
clc ; 2
|
|
lda gr_400_offsets_h,Y ; 4
|
|
adc DRAW_PAGE ; add in draw page offset ; 3
|
|
sta rplot2_smc+2 ; 4
|
|
sta rplot12_smc+2 ; 4
|
|
sta rplot22_smc+2 ; 4
|
|
|
|
|
|
|
|
;=====================
|
|
; unroll 0, even line
|
|
;=====================
|
|
|
|
|
|
; xp=cca+ysa; 8.8 fixed point
|
|
clc ; 2
|
|
lda YSAL ; 3
|
|
adc CCAL ; 3
|
|
sta XPL ; 3
|
|
lda YSAH ; 3
|
|
adc CCAH ; 3
|
|
sta XPH ; 3
|
|
;==========
|
|
; 20
|
|
|
|
; yp=yca-csa; 8.8 fixed point
|
|
|
|
sec ; 2
|
|
lda YCAL ; 3
|
|
sbc CSAL ; 3
|
|
sta YPL ; 3
|
|
lda YCAH ; 3
|
|
sbc CSAH ; 3
|
|
sta YPH ; 3
|
|
;===========
|
|
; 20
|
|
|
|
|
|
|
|
; for(xx=0;xx<40;xx++) {
|
|
ldx #0 ; 2
|
|
rotozoom_xloop:
|
|
|
|
|
|
|
|
;===================================================================
|
|
;===================================================================
|
|
; note: every cycle saved below here
|
|
; saves 1600 cycles
|
|
;===================================================================
|
|
;===================================================================
|
|
|
|
; if ((xp<0) || (xp>39)) color=0;
|
|
; else if ((yp<0) || (yp>39)) color=0;
|
|
; else color=scrn_page(xp,yp,PAGE2);
|
|
|
|
; we know it's never going to go *that* far out of bounds
|
|
; so we could avoid the Y check by just having "0"
|
|
; on the edges of the screen? Tricky due to Apple II
|
|
; interlacing
|
|
|
|
roto_color_even_smc:
|
|
lda #0 ; default color ; 2
|
|
|
|
ldy XPH ; 3
|
|
bmi rplot ; 2nt/3
|
|
cpy #40 ; 2
|
|
bcs rplot ; 2nt/3
|
|
|
|
ldy YPH ; 3
|
|
bmi rplot ; 2nt/3
|
|
cpy #40 ; 2
|
|
bcs rplot ; 2nt/3
|
|
|
|
|
|
|
|
;==================================================
|
|
|
|
; scrn(xp,yp)
|
|
|
|
tya ; YPH ; 2
|
|
|
|
lsr ; divide to get index, also low bit in carry ; 2
|
|
tay ; 2
|
|
|
|
; TODO: put these in zero page?
|
|
; also we can share low bytes with other lookup
|
|
|
|
lda common_offsets_l,Y ; lookup low-res memory address ; 4
|
|
sta BASL ; 3
|
|
lda scrn_c00_offsets_h,Y ; 4
|
|
sta BASH ; 3
|
|
|
|
|
|
ldy XPH ; 3
|
|
lda (BASL),Y ; top/bottom color ; 5+
|
|
|
|
; carry was set a bit before to low bit of YPH
|
|
; hopefully nothing has cleared it
|
|
|
|
bcc rscrn_adjust_even ; 2nt/3
|
|
|
|
rscrn_adjust_odd:
|
|
; YP was odd so want top nibble
|
|
lsr ; 2
|
|
lsr ; 2
|
|
lsr ; 2
|
|
lsr ; 2
|
|
|
|
; fall through
|
|
|
|
rscrn_adjust_even:
|
|
|
|
; YP was even so want bottom nibble
|
|
and #$f ; 2
|
|
|
|
rscrn_done:
|
|
|
|
|
|
|
|
;=============================================
|
|
|
|
|
|
; always even, want A in bottom of nibble
|
|
; so we are all set
|
|
|
|
rotozoom_set_color:
|
|
; want same color in top and bottom nibbles
|
|
;==========
|
|
; 0
|
|
|
|
;=================================================
|
|
|
|
rplot:
|
|
|
|
; plot(xx,yy); (color is in A)
|
|
|
|
; we are in loop unroll0 so always even line here
|
|
|
|
; meaning we want to load old color, save top nibble, and over-write
|
|
; bottom nibble with our value
|
|
|
|
; but! we don't need to save old as we are re-drawing whole screen!
|
|
|
|
rplot_even:
|
|
|
|
rplot2_smc:
|
|
sta $400,X ; 5
|
|
;============
|
|
; 5
|
|
|
|
;=======================
|
|
|
|
; xp=xp+ca; fixed point 8.8
|
|
|
|
clc ; 2
|
|
lda CAL ; 3
|
|
adc XPL ; 3
|
|
sta XPL ; 3
|
|
lda CAH ; 3
|
|
adc XPH ; 3
|
|
sta XPH ; 3
|
|
|
|
; yp=yp-sa; fixed point 8.8
|
|
|
|
sec ; 2
|
|
lda YPL ; 3
|
|
sbc SAL ; 3
|
|
sta YPL ; 3
|
|
lda YPH ; 3
|
|
sbc SAH ; 3
|
|
sta YPH ; 3
|
|
|
|
rotozoom_end_xloop:
|
|
inx ; 2
|
|
cpx #40 ; 2
|
|
bne rotozoom_xloop ; 2nt/3
|
|
rotozoom_xloop_done:
|
|
|
|
|
|
|
|
; yca+=ca; 8.8 fixed point
|
|
|
|
clc ; 2
|
|
lda YCAL ; 3
|
|
adc CAL ; 3
|
|
sta YCAL ; 3
|
|
lda YCAH ; 3
|
|
adc CAH ; 3
|
|
sta YCAH ; 3
|
|
;===========
|
|
; 20
|
|
|
|
; ysa+=sa; 8.8 fixed point
|
|
|
|
clc ; 2
|
|
lda YSAL ; 3
|
|
adc SAL ; 3
|
|
sta YSAL ; 3
|
|
lda YSAH ; 3
|
|
adc SAH ; 3
|
|
sta YSAH ; 3
|
|
;==========
|
|
; 20
|
|
|
|
|
|
;===============
|
|
; loop unroll 1
|
|
;===============
|
|
|
|
;rotozoom_yloop:
|
|
|
|
; xp=cca+ysa; 8.8 fixed point
|
|
clc ; 2
|
|
lda YSAL ; 3
|
|
adc CCAL ; 3
|
|
sta XPL ; 3
|
|
lda YSAH ; 3
|
|
adc CCAH ; 3
|
|
sta XPH ; 3
|
|
;==========
|
|
; 20
|
|
|
|
; yp=yca-csa; 8.8 fixed point
|
|
|
|
sec ; 2
|
|
lda YCAL ; 3
|
|
sbc CSAL ; 3
|
|
sta YPL ; 3
|
|
lda YCAH ; 3
|
|
sbc CSAH ; 3
|
|
sta YPH ; 3
|
|
;===========
|
|
; 20
|
|
|
|
; for(xx=0;xx<40;xx++) {
|
|
ldx #0 ; 2
|
|
rotozoom_xloop2:
|
|
|
|
|
|
|
|
;===================================================================
|
|
;===================================================================
|
|
; note: every cycle saved below here
|
|
; saves 1600 cycles
|
|
;===================================================================
|
|
;===================================================================
|
|
|
|
; if ((xp<0) || (xp>39)) color=0;
|
|
; else if ((yp<0) || (yp>39)) color=0;
|
|
; else color=scrn_page(xp,yp,PAGE2);
|
|
|
|
; we know it's never going to go *that* far out of bounds
|
|
; so we could avoid the Y check by just having "0"
|
|
; on the edges of the screen? Tricky due to Apple II
|
|
; interlacing
|
|
|
|
roto_color_odd_smc:
|
|
lda #0 ; default color ; 2
|
|
|
|
ldy XPH ; 3
|
|
bmi rplot2 ; 2nt/3
|
|
cpy #40 ; 2
|
|
bcs rplot2 ; 2nt/3
|
|
|
|
ldy YPH ; 3
|
|
bmi rplot2 ; 2nt/3
|
|
cpy #40 ; 2
|
|
bcs rplot2 ; 2nt/3
|
|
|
|
|
|
|
|
;==================================================
|
|
|
|
; scrn(xp,yp)
|
|
|
|
tya ; YPH ; 2
|
|
|
|
lsr ; divide to get index, also low bit in carry ; 2
|
|
tay ; 2
|
|
|
|
; TODO: put these in zero page?
|
|
; also we can share low bytes with other lookup
|
|
|
|
lda common_offsets_l,Y ; lookup low-res memory address ; 4
|
|
sta BASL ; 3
|
|
lda scrn_c00_offsets_h,Y ; 4
|
|
sta BASH ; 3
|
|
|
|
|
|
ldy XPH ; 3
|
|
lda (BASL),Y ; top/bottom color ; 5+
|
|
|
|
; carry was set a bit before to low bit of YPH
|
|
; hopefully nothing has cleared it
|
|
|
|
bcs rscrn_adjust_odd2 ; 3
|
|
|
|
rscrn_adjust_even2:
|
|
|
|
; want bottom color, but put it in top of A
|
|
asl ; 2
|
|
asl ; 2
|
|
asl ; 2
|
|
asl ; 2
|
|
|
|
jmp rscrn_done2 ; 3
|
|
|
|
rscrn_adjust_odd2:
|
|
; want top color alone
|
|
|
|
and #$f0 ; 2
|
|
|
|
rscrn_done2:
|
|
|
|
|
|
|
|
;=============================================
|
|
|
|
|
|
rotozoom_set_color2:
|
|
; always odd
|
|
; want color in top, which it is from above
|
|
;==========
|
|
; 0
|
|
|
|
;=================================================
|
|
|
|
rplot2:
|
|
|
|
; plot(xx,yy); (color is in A)
|
|
|
|
; always odd, so place color in top
|
|
|
|
; note! since we are drawing whole screen, we know the top of
|
|
; the value is already clear from loop=0 so we don't have to mask
|
|
|
|
rplot_odd:
|
|
rplot12_smc:
|
|
ora $400,X ; 4
|
|
rplot22_smc:
|
|
sta $400,X ; 5
|
|
|
|
;============
|
|
; 9
|
|
|
|
;=======================
|
|
|
|
; xp=xp+ca; 8.8 fixed point
|
|
|
|
clc ; 2
|
|
lda CAL ; 3
|
|
adc XPL ; 3
|
|
sta XPL ; 3
|
|
lda CAH ; 3
|
|
adc XPH ; 3
|
|
sta XPH ; 3
|
|
|
|
; yp=yp-sa; 8.8 fixed point
|
|
|
|
sec ; 2
|
|
lda YPL ; 3
|
|
sbc SAL ; 3
|
|
sta YPL ; 3
|
|
lda YPH ; 3
|
|
sbc SAH ; 3
|
|
sta YPH ; 3
|
|
|
|
rotozoom_end_xloop2:
|
|
inx ; 2
|
|
cpx #40 ; 2
|
|
bne rotozoom_xloop2 ; 3
|
|
rotozoom_xloop_done2:
|
|
|
|
; yca+=ca; 8.8 fixed point
|
|
|
|
clc ; 2
|
|
lda YCAL ; 3
|
|
adc CAL ; 3
|
|
sta YCAL ; 3
|
|
lda YCAH ; 3
|
|
adc CAH ; 3
|
|
sta YCAH ; 3
|
|
;===========
|
|
; 20
|
|
|
|
; ysa+=sa; 8.8 fixed point
|
|
|
|
clc ; 2
|
|
lda YSAL ; 3
|
|
adc SAL ; 3
|
|
sta YSAL ; 3
|
|
lda YSAH ; 3
|
|
adc SAH ; 3
|
|
sta YSAH ; 3
|
|
;==========
|
|
; 20
|
|
|
|
rotozoom_end_yloop:
|
|
inc YY ; 5
|
|
ldy YY ; 3
|
|
cpy #20 ; 2
|
|
beq done_rotozoom ; 2nt/3
|
|
jmp rotozoom_yloop ; too far ; 3
|
|
|
|
done_rotozoom:
|
|
rts ; 6
|
|
|
|
|
|
|
|
fixed_sin:
|
|
; .byte $00,$00 ; 0.000000=00.00
|
|
; .byte $00,$61 ; 0.382683=00.61
|
|
; .byte $00,$b5 ; 0.707107=00.b5
|
|
; .byte $00,$ec ; 0.923880=00.ec
|
|
; .byte $01,$00 ; 1.000000=01.00
|
|
; .byte $00,$ec ; 0.923880=00.ec
|
|
; .byte $00,$b5 ; 0.707107=00.b5
|
|
; .byte $00,$61 ; 0.382683=00.61
|
|
; .byte $00,$00 ; 0.000000=00.00
|
|
; .byte $ff,$9f ; -0.382683=ff.9f
|
|
; .byte $ff,$4b ; -0.707107=ff.4b
|
|
; .byte $ff,$14 ; -0.923880=ff.14
|
|
; .byte $ff,$00 ; -1.000000=ff.00
|
|
; .byte $ff,$14 ; -0.923880=ff.14
|
|
; .byte $ff,$4b ; -0.707107=ff.4b
|
|
; .byte $ff,$9f ; -0.382683=ff.9f
|
|
|
|
.byte $00,$00 ; 0.000000
|
|
.byte $00,$31 ; 0.195090
|
|
.byte $00,$61 ; 0.382683
|
|
.byte $00,$8E ; 0.555570
|
|
.byte $00,$B5 ; 0.707107
|
|
.byte $00,$D4 ; 0.831470
|
|
.byte $00,$EC ; 0.923880
|
|
.byte $00,$FB ; 0.980785
|
|
.byte $01,$00 ; 1.000000
|
|
.byte $00,$FB ; 0.980785
|
|
.byte $00,$EC ; 0.923880
|
|
.byte $00,$D4 ; 0.831470
|
|
.byte $00,$B5 ; 0.707107
|
|
.byte $00,$8E ; 0.555570
|
|
.byte $00,$61 ; 0.382683
|
|
.byte $00,$31 ; 0.195090
|
|
.byte $00,$00 ; 0.000000
|
|
.byte $FF,$CF ; -0.195090
|
|
.byte $FF,$9F ; -0.382683
|
|
.byte $FF,$72 ; -0.555570
|
|
.byte $FF,$4B ; -0.707107
|
|
.byte $FF,$2C ; -0.831470
|
|
.byte $FF,$14 ; -0.923880
|
|
.byte $FF,$05 ; -0.980785
|
|
.byte $FF,$00 ; -1.000000
|
|
.byte $FF,$05 ; -0.980785
|
|
.byte $FF,$14 ; -0.923880
|
|
.byte $FF,$2C ; -0.831470
|
|
.byte $FF,$4B ; -0.707107
|
|
.byte $FF,$72 ; -0.555570
|
|
.byte $FF,$9F ; -0.382683
|
|
.byte $FF,$CF ; -0.195090
|