demo: o: back below 256B
This commit is contained in:
Vince Weaver
parent
ca945e3609
commit
031eb48e6a
|
|
@ -1,15 +1,21 @@
|
|||
; New Demo
|
||||
; DSR Scroll Demo -- 256B Apple II Demo for Outline 2022
|
||||
|
||||
; by Vince `deater` Weaver
|
||||
; by Vince `deater` Weaver / dSr
|
||||
|
||||
|
||||
; 253 bytes -- init with no sound
|
||||
; 253 bytes -- initial implementation with no sound
|
||||
; 251 bytes -- no phase
|
||||
; 247 bytes -- move scale before so don't have to reload 0
|
||||
; 243 bytes -- use BIT trick
|
||||
; 242 bytes -- load frame into Y
|
||||
; 240 bytes -- more BIT trick
|
||||
; 239 bytes -- compare with BMI
|
||||
; 263 bytes -- initially add sound
|
||||
; 262 bytes -- make Y always 0 in xdraw
|
||||
; 260 bytes -- ust BIT to determine phase
|
||||
; 258 bytes -- no need to init PAGE at start
|
||||
; 257 bytes -- remove a CLC as we know carry always set
|
||||
; 256 bytes -- optimize phase now that we are setting 0/7 not 1/8
|
||||
; 255 bytes -- optimize same area some more
|
||||
|
||||
; zero page locations
|
||||
HGR_SHAPE = $1A
|
||||
|
|
@ -23,10 +29,8 @@ YREG = $47
|
|||
|
||||
FRAME = $6D
|
||||
PAGE = $6E
|
||||
LINE = $6F
|
||||
OUTL = $74
|
||||
OUTH = $75
|
||||
COUNT = $76
|
||||
|
||||
; C0-CF should be clear
|
||||
; D0-DF?? D0-D5 = HGR scratch?
|
||||
|
|
@ -90,7 +94,6 @@ dsr_scroll_intro:
|
|||
jsr HGR2 ; Hi-res, full screen
|
||||
; Y=0, A=0 after this call
|
||||
|
||||
sta PAGE ; needed?
|
||||
sta FRAME
|
||||
sta OUTL
|
||||
|
||||
|
|
@ -101,8 +104,10 @@ dsr_scroll_intro:
|
|||
hires_setup:
|
||||
|
||||
; A is 0 here
|
||||
; Y is also 0 here
|
||||
; lda #0 ; non-rotate, on HGR PAGE2
|
||||
jsr xdraw ;
|
||||
tay ; reset Y to 0
|
||||
|
||||
lda #$20 ; switch drawing to HGR PAGE1
|
||||
sta HGR_PAGE
|
||||
|
|
@ -130,15 +135,12 @@ main_loop:
|
|||
|
||||
sta OUTH
|
||||
|
||||
; bit SPEAKER
|
||||
|
||||
|
||||
;=======================
|
||||
; delay
|
||||
;=======================
|
||||
|
||||
lda #200
|
||||
jsr WAIT
|
||||
jsr play_sound
|
||||
|
||||
;=======================
|
||||
; handle state
|
||||
|
|
@ -148,49 +150,73 @@ main_loop:
|
|||
; LO-RES DOWN SCROLL 128..191
|
||||
; TEXT RIGHT SCROLL 192..255
|
||||
|
||||
|
||||
ldx #0
|
||||
|
||||
inc FRAME
|
||||
|
||||
ldy FRAME
|
||||
cpy #192 ; 192
|
||||
bcs phase3
|
||||
tya
|
||||
bmi phase2 ; 128
|
||||
cpy #64 ; 64
|
||||
bcc phase0
|
||||
lda #$1F
|
||||
bit FRAME ; puts bit 7 in N and bit 6 in V
|
||||
php ; save flags (zero is one we care)
|
||||
|
||||
bpl n_clear
|
||||
bvc phase2
|
||||
bvs phase3
|
||||
n_clear:
|
||||
bvc phase0
|
||||
; bvs phase1
|
||||
|
||||
phase1:
|
||||
bit LORES ; enable lo-res
|
||||
lda #8 ; make vertical scroll
|
||||
; LORES Vertical Scroll
|
||||
|
||||
.byte $2C ; BIT trick to skip the load
|
||||
bit LORES ; enable lo-res
|
||||
ldx #7 ; make vertical scroll
|
||||
|
||||
; .byte $24 ; BIT trick to skip the txa
|
||||
phase2:
|
||||
lda #1 ; make horizontal scroll
|
||||
sta pattern_dir_smc+1
|
||||
bne done_phase ; bra
|
||||
; LORES Horizontal Scroll
|
||||
|
||||
; X is 7 or 0 here
|
||||
; txa ; make horizontal scroll (0)
|
||||
; lda #0 ; make horizontal scroll
|
||||
stx pattern_dir_smc+1
|
||||
jmp done_phase ; bra
|
||||
|
||||
|
||||
phase0:
|
||||
; HIRES on GRAPHICS on
|
||||
bit HIRES
|
||||
.byte $24 ; BIT trick
|
||||
.byte $24 ; BIT trick to skip the inx
|
||||
phase3:
|
||||
; TEXT ON
|
||||
inx ; point to SET_TEXT rather than SET_GR
|
||||
lda SET_GR,X ; set mode
|
||||
|
||||
done_phase:
|
||||
|
||||
tya ; FRAME
|
||||
and #$1f
|
||||
plp ; restore flags
|
||||
bne not_zero
|
||||
|
||||
; rolled around, reset?
|
||||
was_zero:
|
||||
|
||||
; update pointer to "random" background color
|
||||
|
||||
inc pattern_smc+2
|
||||
|
||||
ldy #135
|
||||
boop_loop:
|
||||
lda #8
|
||||
jsr play_sound
|
||||
|
||||
lda #9
|
||||
jsr play_sound
|
||||
|
||||
dey
|
||||
bne boop_loop
|
||||
|
||||
not_zero:
|
||||
|
||||
|
||||
|
||||
;============================
|
||||
; draw an interleaved line
|
||||
full_loop:
|
||||
|
|
@ -251,7 +277,7 @@ done_bg:
|
|||
;=======================================
|
||||
; done drawing frame
|
||||
;=======================================
|
||||
|
||||
bit $C030
|
||||
|
||||
;======================
|
||||
; draw bitmap
|
||||
|
|
@ -304,11 +330,14 @@ its_black:
|
|||
|
||||
;=========================
|
||||
; scroll one line
|
||||
;=========================
|
||||
; if +1 then horizontal
|
||||
; if +8 then vertical
|
||||
|
||||
; to scroll up need to add 8?
|
||||
; inc pattern_smc+1
|
||||
; our current bitmap top line is all FFs
|
||||
; so we know carry will be set here
|
||||
|
||||
clc
|
||||
; clc
|
||||
lda pattern_smc+1
|
||||
pattern_dir_smc:
|
||||
adc #$8
|
||||
|
|
@ -334,11 +363,12 @@ flip_page:
|
|||
; xdraw
|
||||
;=======================
|
||||
; rotation in A
|
||||
; Y should be 0 on entry
|
||||
xdraw:
|
||||
pha ; save rotation
|
||||
; setup X and Y co-ords
|
||||
|
||||
ldy #0 ; XPOSH always 0 for us
|
||||
; ldy #0 ; XPOSH always 0 for us
|
||||
ldx #140
|
||||
lda #80 ; 96 would be halfway?
|
||||
jsr HPOSN ; X= (y,x) Y=(a)
|
||||
|
|
@ -358,6 +388,14 @@ xdraw:
|
|||
|
||||
; tail call
|
||||
|
||||
;=============================
|
||||
; play_sound
|
||||
;=============================
|
||||
play_sound:
|
||||
bit $C030
|
||||
jmp WAIT
|
||||
|
||||
|
||||
; updated desire logo thanks to Jade/HMD
|
||||
|
||||
;012|456|012|456|
|
||||
|
|
@ -384,7 +422,6 @@ bitmap2:
|
|||
.byte $FF
|
||||
.byte $23
|
||||
.byte $F9
|
||||
|
||||
.byte $23
|
||||
.byte $39
|
||||
.byte $29
|
||||
|
|
|
|||
Loading…
Reference in New Issue