mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-16 23:20:43 +00:00
187 lines
2.7 KiB
ArmAsm
187 lines
2.7 KiB
ArmAsm
; Lo-res fire animation
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; by deater (Vince Weaver) <vince@deater.net>
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; based on code described here http://fabiensanglard.net/doom_fire_psx/
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; Zero Page
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COLOR = $30
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SEEDL = $4E
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DRAW_PAGE = $EE
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TEMP = $FA
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TEMPY = $FB
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; Soft Switches
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KEYPRESS= $C000
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KEYRESET= $C010
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SET_GR = $C050 ; Enable graphics
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FULLGR = $C052 ; Full screen, no text
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PAGE0 = $C054 ; Page0
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PAGE1 = $C055 ; Page1
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LORES = $C056 ; Enable LORES graphics
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PADDLE_BUTTON0 = $C061
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PADDL0 = $C064
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PTRIG = $C070
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; ROM routines
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TEXT = $FB36 ;; Set text mode
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HOME = $FC58 ;; Clear the text screen
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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fire_demo:
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;===================
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; init screen
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jsr TEXT
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jsr HOME
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bit PAGE0
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;===================
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; init vars
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lda #0
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;==============================
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; setup graphics for vapor lock
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;==============================
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; jsr vapor_lock ; 6
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; vapor lock returns with us at beginning of hsync in line
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; 114 (7410 cycles), so with 5070 lines to go
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; jsr gr_copy_to_current ; 6+ 9292
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; now we have 322 left
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; GR part
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bit LORES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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; 322 - 12 = 310
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; -3 for jmp
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; 307
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; Try X=9 Y=6 cycles=307
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; ldy #6 ; 2
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;wfloopA:ldx #9 ; 2
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;wfloopB:dex ; 2
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; bne wfloopB ; 2nt/3
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; dey ; 2
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; bne wfloopA ; 2nt/3
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jsr clear_screens_notext
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; Setup white line on bottom
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lda #$ff
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ldx #39
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white_loop:
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sta $7d0,X ; hline 24 (46+47)
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dex
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bpl white_loop
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fire_loop:
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ldy #44 ; 22 * 2
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yloop:
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lda gr_offsets,Y
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sta smc2+1
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lda gr_offsets+1,Y
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sta smc2+2
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lda gr_offsets+2,Y
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sta smc1+1
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lda gr_offsets+3,Y
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sta smc1+2
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sty TEMPY
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ldx #39
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xloop:
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smc1:
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lda $7d0,X
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sta TEMP
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and #$f ; mask off
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tay
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jsr random16
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lda SEEDL
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and #$1
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beq no_change
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decrement:
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lda color_progression,Y
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jmp done_change
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no_change:
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lda TEMP
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done_change:
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smc2:
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sta $750,X
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dex
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bpl xloop
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ldy TEMPY
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dey
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dey
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bpl yloop
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;======================================================
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; We have 4550 cycles in the vblank, use them wisely
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;======================================================
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; do_nothing should be 4550
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; =============
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; 15 cycles
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;====================
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; Handle keypresses
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; if no keypress, 9
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; if keypress, 6+43 = 49
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lda KEYPRESS ; 4
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bmi keypress
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; 2
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no_keypress:
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jmp fire_loop
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keypress:
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jmp keypress
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color_progression:
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.byte 0 ; 0->0
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.byte $88 ; 1->8
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.byte 0 ; 2->0
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.byte 0 ; 3->0
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.byte 0 ; 4->0
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.byte 0 ; 5->0
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.byte 0 ; 6->0
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.byte 0 ; 7->0
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.byte $55 ; 8->5
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.byte $11 ; 9->1
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.byte 0 ; 10->0
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.byte 0 ; 11->0
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.byte 0 ; 12->0
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.byte $99 ; 13->9
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.byte 0 ; 14->0
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.byte $dd ; 15->13
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.include "gr_hline.s"
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.include "gr_fast_clear.s"
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.include "vapor_lock.s"
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.include "delay_a.s"
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.include "random16.s"
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