mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-05-28 17:41:29 +00:00
187 lines
2.7 KiB
ArmAsm
187 lines
2.7 KiB
ArmAsm
; Lo-res fire animation
|
|
|
|
; by deater (Vince Weaver) <vince@deater.net>
|
|
|
|
; based on code described here http://fabiensanglard.net/doom_fire_psx/
|
|
|
|
; Zero Page
|
|
COLOR = $30
|
|
SEEDL = $4E
|
|
DRAW_PAGE = $EE
|
|
TEMP = $FA
|
|
TEMPY = $FB
|
|
|
|
|
|
|
|
; Soft Switches
|
|
KEYPRESS= $C000
|
|
KEYRESET= $C010
|
|
SET_GR = $C050 ; Enable graphics
|
|
FULLGR = $C052 ; Full screen, no text
|
|
PAGE0 = $C054 ; Page0
|
|
PAGE1 = $C055 ; Page1
|
|
LORES = $C056 ; Enable LORES graphics
|
|
PADDLE_BUTTON0 = $C061
|
|
PADDL0 = $C064
|
|
PTRIG = $C070
|
|
|
|
; ROM routines
|
|
|
|
TEXT = $FB36 ;; Set text mode
|
|
HOME = $FC58 ;; Clear the text screen
|
|
WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
|
|
|
|
|
|
fire_demo:
|
|
|
|
;===================
|
|
; init screen
|
|
jsr TEXT
|
|
jsr HOME
|
|
bit PAGE0
|
|
|
|
;===================
|
|
; init vars
|
|
lda #0
|
|
|
|
;==============================
|
|
; setup graphics for vapor lock
|
|
;==============================
|
|
|
|
; jsr vapor_lock ; 6
|
|
|
|
; vapor lock returns with us at beginning of hsync in line
|
|
; 114 (7410 cycles), so with 5070 lines to go
|
|
|
|
; jsr gr_copy_to_current ; 6+ 9292
|
|
|
|
; now we have 322 left
|
|
|
|
; GR part
|
|
bit LORES ; 4
|
|
bit SET_GR ; 4
|
|
bit FULLGR ; 4
|
|
|
|
; 322 - 12 = 310
|
|
; -3 for jmp
|
|
; 307
|
|
|
|
; Try X=9 Y=6 cycles=307
|
|
|
|
; ldy #6 ; 2
|
|
;wfloopA:ldx #9 ; 2
|
|
;wfloopB:dex ; 2
|
|
; bne wfloopB ; 2nt/3
|
|
; dey ; 2
|
|
; bne wfloopA ; 2nt/3
|
|
|
|
|
|
jsr clear_screens_notext
|
|
|
|
; Setup white line on bottom
|
|
|
|
lda #$ff
|
|
ldx #39
|
|
white_loop:
|
|
sta $7d0,X ; hline 24 (46+47)
|
|
dex
|
|
bpl white_loop
|
|
|
|
|
|
fire_loop:
|
|
|
|
ldy #44 ; 22 * 2
|
|
|
|
yloop:
|
|
|
|
lda gr_offsets,Y
|
|
sta smc2+1
|
|
lda gr_offsets+1,Y
|
|
sta smc2+2
|
|
lda gr_offsets+2,Y
|
|
sta smc1+1
|
|
lda gr_offsets+3,Y
|
|
sta smc1+2
|
|
|
|
sty TEMPY
|
|
|
|
ldx #39
|
|
xloop:
|
|
smc1:
|
|
lda $7d0,X
|
|
sta TEMP
|
|
and #$f ; mask off
|
|
tay
|
|
|
|
jsr random16
|
|
lda SEEDL
|
|
and #$1
|
|
beq no_change
|
|
|
|
decrement:
|
|
lda color_progression,Y
|
|
jmp done_change
|
|
no_change:
|
|
lda TEMP
|
|
done_change:
|
|
|
|
smc2:
|
|
sta $750,X
|
|
dex
|
|
bpl xloop
|
|
|
|
ldy TEMPY
|
|
|
|
dey
|
|
dey
|
|
bpl yloop
|
|
|
|
|
|
|
|
;======================================================
|
|
; We have 4550 cycles in the vblank, use them wisely
|
|
;======================================================
|
|
; do_nothing should be 4550
|
|
; =============
|
|
; 15 cycles
|
|
|
|
|
|
;====================
|
|
; Handle keypresses
|
|
; if no keypress, 9
|
|
; if keypress, 6+43 = 49
|
|
|
|
lda KEYPRESS ; 4
|
|
bmi keypress
|
|
; 2
|
|
no_keypress:
|
|
jmp fire_loop
|
|
|
|
keypress:
|
|
jmp keypress
|
|
|
|
|
|
color_progression:
|
|
.byte 0 ; 0->0
|
|
.byte $88 ; 1->8
|
|
.byte 0 ; 2->0
|
|
.byte 0 ; 3->0
|
|
.byte 0 ; 4->0
|
|
.byte 0 ; 5->0
|
|
.byte 0 ; 6->0
|
|
.byte 0 ; 7->0
|
|
.byte $55 ; 8->5
|
|
.byte $11 ; 9->1
|
|
.byte 0 ; 10->0
|
|
.byte 0 ; 11->0
|
|
.byte 0 ; 12->0
|
|
.byte $99 ; 13->9
|
|
.byte 0 ; 14->0
|
|
.byte $dd ; 15->13
|
|
|
|
.include "gr_hline.s"
|
|
.include "gr_fast_clear.s"
|
|
.include "vapor_lock.s"
|
|
.include "delay_a.s"
|
|
.include "random16.s"
|