mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-26 11:30:12 +00:00
raster: small raster bars?
This commit is contained in:
Vince Weaver
parent
ffb014892c
commit
230333cd78
113
fire/blinky_blinds.s
Normal file
113
fire/blinky_blinds.s
Normal file
@ -0,0 +1,113 @@
|
||||
; Apple ][ Lo-res rasterbars, size-optimized
|
||||
|
||||
; by deater (Vince Weaver) <vince@deater.net>
|
||||
|
||||
; Zero Page
|
||||
|
||||
WNDTOP = $22
|
||||
WNDBTM = $23
|
||||
CV = $25
|
||||
BASL = $28
|
||||
BASH = $29
|
||||
BAS2L = $2A
|
||||
BAS2H = $2B
|
||||
SEEDL = $4E
|
||||
|
||||
; Soft Switches
|
||||
SET_GR = $C050 ; Enable graphics
|
||||
MIXCLR = $C052 ; Full screen, no text at bottom
|
||||
LORES = $C056 ; Enable LORES graphics
|
||||
|
||||
; Monitor ROM routines. Try to use well-known entry points as
|
||||
; these did sometimes change with newer models
|
||||
SCROLL = $FC70
|
||||
VTAB = $FC22 ; takes row in CV, Result is in BASL:BASH ($28/$29)
|
||||
VTABZ = $FC24 ; VTABZ variant takes row in Accumulator
|
||||
|
||||
raster_demo:
|
||||
|
||||
; Set lores graphics
|
||||
|
||||
bit SET_GR ; force graphics mode ; 3
|
||||
; LORES and LOWSCR (lo-res page1)
|
||||
; are set by the boot rom
|
||||
|
||||
bit MIXCLR ; want full-screen graphics w/o mixed ; 3
|
||||
; text the boot process doesn't set this
|
||||
; (it doesn't matter in text mode)
|
||||
; and while IIe and emulators come up clear
|
||||
; my Apple II+ doesn't
|
||||
|
||||
; Set window. This seems to be set properly at boot though
|
||||
; lda #0
|
||||
; sta WNDTOP
|
||||
; lda #24
|
||||
; sta WNDBTM
|
||||
|
||||
reset_scroll:
|
||||
|
||||
jsr random8
|
||||
sta CV
|
||||
|
||||
scroll_loop:
|
||||
|
||||
jsr SCROLL ; scrolls screen up one row ; 3
|
||||
|
||||
|
||||
;======================================
|
||||
; re-draw bottom line (row 23) as white
|
||||
|
||||
|
||||
; Y is left at 40 after SCROLL
|
||||
; also BAS2L:BAS2H is left at $7d0
|
||||
; this code over-writes $7F8 (the MSLOT screen hole value)
|
||||
; but this should not matter for this demo
|
||||
|
||||
lda CV
|
||||
and #7
|
||||
tax
|
||||
lda <color_progression,X
|
||||
|
||||
; lda #$ff ; top/bottom white ; 2
|
||||
w_loop:
|
||||
sta (BAS2L),Y ; hline 23 (46+47) ; 2
|
||||
dey ; 1
|
||||
bpl w_loop ; 2
|
||||
;============
|
||||
; 8
|
||||
|
||||
no_change:
|
||||
|
||||
dec CV ; 2
|
||||
|
||||
bpl reset_scroll ; 2
|
||||
bmi scroll_loop ; 2
|
||||
|
||||
|
||||
color_progression:
|
||||
.byte $00 ; 8->0 ; 1000 -> 0000 ; needed
|
||||
.byte $bb ; 9->11 ; 1001 -> 1011
|
||||
.byte $00 ; 10->0 ; 1010 -> 0000 ; needed
|
||||
.byte $aa ; 11->10 ; 1011 -> 1010
|
||||
.byte $00 ; 12->0 ; 1100 -> 0000 ; don't care
|
||||
.byte $99 ; 13->9 ; 1101 -> 1001
|
||||
.byte $00 ; 14->0 ; 1110 -> 0000 ; don't care
|
||||
.byte $dd ; 15->13 ; 1111 -> 1101
|
||||
|
||||
|
||||
;=============================
|
||||
; random8
|
||||
;=============================
|
||||
; 8-bit 6502 Random Number Generator
|
||||
; Linear feedback shift register PRNG by White Flame
|
||||
; http://codebase64.org/doku.php?id=base:small_fast_8-bit_prng
|
||||
|
||||
random8:
|
||||
lda SEEDL ; 2
|
||||
beq doEor ; 2
|
||||
asl ; 1
|
||||
beq noEor ; if the input was $80, skip the EOR ; 2
|
||||
bcc noEor ; 2
|
||||
doEor: eor #$1d ; 2
|
||||
noEor: sta SEEDL ; 2
|
||||
rts
|
||||
101
fire/raster.s
101
fire/raster.s
@ -1,26 +1,7 @@
|
||||
; Apple ][ Lo-res fire animation, size-optimized to 64 bytes
|
||||
; Apple ][ Lo-res rasterbars, size-optimized
|
||||
|
||||
; by deater (Vince Weaver) <vince@deater.net>
|
||||
|
||||
; originally based on code described here
|
||||
; http://fabiensanglard.net/doom_fire_psx/
|
||||
; but this is a slightly different algorithm (but still cool looking)
|
||||
|
||||
; Optimization history:
|
||||
; 80 bytes -- the size of tire_tiny.s
|
||||
; 64 bytes -- use the firmware SCROLL routine to handle the scrolling
|
||||
; this adds some flicker but saves many bytes
|
||||
; 63 bytes -- qkumba noted that SCROLL leaves BAS2L:BAS2H pointing at $7d0
|
||||
; 66 bytes -- tried on real hardware. Found that the original firmware
|
||||
; never sets MIXCLR on boot, and my II+ machine was leaving
|
||||
; it off so for correctness need to add it on.
|
||||
; 66 bytes -- wasted a lot of time trying to either find clever ways to
|
||||
; get $C050/C052 accessed, or to shorten the lookup table
|
||||
; in half by lsr. Nothing panned out.
|
||||
; 64 bytes -- realized I could save/restore the random SEEDL on the stack!
|
||||
; doesn't seem to affect the output pattern either.
|
||||
|
||||
|
||||
; Zero Page
|
||||
|
||||
WNDTOP = $22
|
||||
@ -43,7 +24,7 @@ SCROLL = $FC70
|
||||
VTAB = $FC22 ; takes row in CV, Result is in BASL:BASH ($28/$29)
|
||||
VTABZ = $FC24 ; VTABZ variant takes row in Accumulator
|
||||
|
||||
fire_demo:
|
||||
raster_demo:
|
||||
|
||||
; Set lores graphics
|
||||
|
||||
@ -63,6 +44,10 @@ fire_demo:
|
||||
; lda #24
|
||||
; sta WNDBTM
|
||||
|
||||
reset_scroll:
|
||||
|
||||
jsr random8
|
||||
sta CV
|
||||
|
||||
scroll_loop:
|
||||
|
||||
@ -78,7 +63,12 @@ scroll_loop:
|
||||
; this code over-writes $7F8 (the MSLOT screen hole value)
|
||||
; but this should not matter for this demo
|
||||
|
||||
lda #$ff ; top/bottom white ; 2
|
||||
lda CV
|
||||
and #7
|
||||
tax
|
||||
lda <color_progression,X
|
||||
|
||||
; lda #$ff ; top/bottom white ; 2
|
||||
w_loop:
|
||||
sta (BAS2L),Y ; hline 23 (46+47) ; 2
|
||||
dey ; 1
|
||||
@ -86,19 +76,28 @@ w_loop:
|
||||
;============
|
||||
; 8
|
||||
|
||||
fire_loop:
|
||||
no_change:
|
||||
|
||||
dec CV ; 2
|
||||
|
||||
bpl reset_scroll ; 2
|
||||
bmi scroll_loop ; 2
|
||||
|
||||
|
||||
color_progression:
|
||||
.byte $03
|
||||
.byte $bf
|
||||
.byte $b3
|
||||
.byte $00
|
||||
.byte $00
|
||||
.byte $02
|
||||
.byte $6f
|
||||
.byte $62
|
||||
|
||||
|
||||
lda #22 ; start at line 22 ; 2
|
||||
sta CV ; store in Row location ; 2
|
||||
|
||||
yloop:
|
||||
; puts address of row CV into BASL:BASH
|
||||
jsr VTAB ; 3
|
||||
|
||||
|
||||
; loop for X values 39 ... 0
|
||||
ldy #39 ; 2
|
||||
xloop:
|
||||
|
||||
;=============================
|
||||
; random8
|
||||
@ -108,45 +107,11 @@ xloop:
|
||||
; http://codebase64.org/doku.php?id=base:small_fast_8-bit_prng
|
||||
|
||||
random8:
|
||||
pla
|
||||
; lda SEEDL ; 2
|
||||
lda SEEDL ; 2
|
||||
beq doEor ; 2
|
||||
asl ; 1
|
||||
beq noEor ; if the input was $80, skip the EOR ; 2
|
||||
bcc noEor ; 2
|
||||
doEor: eor #$1d ; 2
|
||||
noEor: ;sta SEEDL ; 2
|
||||
pha
|
||||
|
||||
; end inlined RNG
|
||||
|
||||
; Randomly either use current value, or decay by one
|
||||
bmi no_change ; assume bit 7 is as random as bit 0 ; 2
|
||||
|
||||
; Lookup the new color in table
|
||||
lda (BASL),Y ; load value ; 2
|
||||
and #$7 ; mask off ; 2
|
||||
tax ; 1
|
||||
lda <(color_progression),X ; 2
|
||||
sta (BASL),Y ; 2
|
||||
no_change:
|
||||
|
||||
dey ; 1
|
||||
bpl xloop ; 2
|
||||
|
||||
dec CV ; 2
|
||||
|
||||
bpl yloop ; 2
|
||||
|
||||
bmi scroll_loop ; 2
|
||||
|
||||
color_progression:
|
||||
.byte $00 ; 8->0 ; 1000 -> 0000 ; needed
|
||||
.byte $bb ; 9->11 ; 1001 -> 1011
|
||||
.byte $00 ; 10->0 ; 1010 -> 0000 ; needed
|
||||
.byte $aa ; 11->10 ; 1011 -> 1010
|
||||
.byte $00 ; 12->0 ; 1100 -> 0000 ; don't care
|
||||
.byte $99 ; 13->9 ; 1101 -> 1001
|
||||
.byte $00 ; 14->0 ; 1110 -> 0000 ; don't care
|
||||
.byte $dd ; 15->13 ; 1111 -> 1101
|
||||
|
||||
noEor: sta SEEDL ; 2
|
||||
rts
|
||||
|
||||
Loading…
Reference in New Issue
Block a user