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fire: update to v1.2 with 64-byte fire_extreme
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Vince Weaver
parent
e14ec89248
commit
7e44173ef4
3
fire/fe_monitor
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3
fire/fe_monitor
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@ -0,0 +1,3 @@
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70: 2c 50 c0 20 70 fc a9 ff 99 cf 07 88 d0 fa a9 16 85 25 20 22 fc a0 27 a5 4e f0 05 0a f0 04 90 02 49 1d 85 4e 30 09 b1 28 29 07 aa b5 a8 91 28 88 10 e5 c6 25 10 dc 30 cb 00 bb 00 aa 00 99 00 dd
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70G
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BIN
fire/fire.dsk
BIN
fire/fire.dsk
Binary file not shown.
@ -1,149 +1,84 @@
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; Lo-res fire animation, size-optimized
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; Apple ][ Lo-res fire animation, size-optimized to 64 bytes
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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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; originally based on code described here
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; http://fabiensanglard.net/doom_fire_psx/
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; but this is a slightly different algorithm (but still cool looking)
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; Optimization history:
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; 80 bytes -- the size of tire_tiny.s
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; 64 bytes -- use the firmware SCROLL routine to handle the scrolling
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; this adds some flicker but saves many bytes
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; 611 bytes at first
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; 601 bytes -- strip out some unused code
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; 592 bytes -- don't init screen
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; 443 bytes -- remove more dead code
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; 206 bytes -- no need to clear screen
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; 193 bytes -- un-cycle exact the random16 code
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; 189 bytes -- more optimization of random16 code
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; 161 bytes -- move to 8-bit RNG
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; 152 bytes -- reduce lookup to top half colors (had to remove brown)
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; also changed maroon to pink
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; 149 bytes -- use monitor GR
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; 149 bytes -- load into zero page
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; 140 bytes -- start using zero-page addressing
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; 139 bytes -- rotate instead of mask for low bit
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; 138 bytes -- bcs instead of jmp
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; 137 bytes -- BIT nop trick to get rid of jump
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; 135 bytes -- push/pull instead of saving to zero page
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; 134 bytes -- replace half of lookup table with math
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; 119 bytes -- replace that half of lookup table with better math
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; 134 bytes -- replace other half of lookup table with math
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; 132 bytes -- replace stack with zp loads
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; 129 bytes -- use Y instead of X
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; 125 bytes -- optimize low byte generationw with branch
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; 113 bytes -- make get_row a subroutine
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; 112 bytes -- regrettable change to the low-byte code
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; 109 bytes -- replace BIT/OR in low calc with an ADC
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; 107 bytes -- replace self-modifying load/store absolute with Y-indirect
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; 106 bytes -- assume bit 8 is as random as bit 0
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; 82 bytes -- use VTAB in firmware to setup addresses
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; (Antoine Vignau on comp.sys.apple2 reminded me of this)
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; 81 bytes -- qkumba points out that GR leaves BASL:BASH pointing at line 23
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; so we can use Y-indirect of BASL to draw the bottom white line
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; 83 bytes -- remove use of X as counter, use CV instead
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; 83 bytes -- tried flipping x/y loops in case it allowed more optimization
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; but the display runs way too slow in that case
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; 81 bytes -- call LF to increment CV + VTAB all at once
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; 80 bytes -- re-arrange how the random stuff happens. remove last BIT hack
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; Zero Page
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SEEDL = $4E
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TEMP = $00
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TEMPY = $01
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OUTL = $04
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OUTH = $05
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WNDTOP = $22
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WNDBTM = $23
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CV = $25
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BASL = $28
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BASH = $29
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H2 = $2C
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COLOR = $30
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; 100 = $64
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SEEDL = $4E
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; Soft Switches
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SET_GR = $C050 ; Enable graphics
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FULLGR = $C052 ; Full screen, no text
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LORES = $C056 ; Enable LORES graphics
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; monitor routines
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ASOFT_GR = $F390
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MON_SETGR = $FB40
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; VTAB notes
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; if Applesoft ROM, we can jump to ASOFT_VTAB which takes value in X
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; this won't work on the original Apple II with Integer ROM
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; we can jum to MON.TABV instead but then have to copy the value
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; to Accumulator first
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; This ovewrites CV (25)
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; Result is in BASL:BASH (28/29)
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ASOFT_VTAB = $F25A
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MON_TABV = $FB5B
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VTAB = $FC22
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VTABZ = $FC24
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LF = $FC66
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; Monitor ROM routines. Try to use well-known entry points as
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; these did sometimes change with newer models
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SCROLL = $FC70
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VTAB = $FC22 ; takes row in CV, Result is in BASL:BASH ($28/$29)
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VTABZ = $FC24 ; VTABZ variant vakes row in Accumulator
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fire_demo:
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; GR part
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; Set lores graphics
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bit SET_GR ; force lores mode ; 3
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; bit FULLGR ; set by default at bootup?
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bit SET_GR ; force graphics mode ; 3
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; happily at bootup FULLGR and LORES
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; seem to already be in the right positions
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; so we get LORES 40x48 mode
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; Setup white line on bottom
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; Set window. This seems to be set properly at boot though
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; lda #0
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; sta WNDTOP
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; lda #24
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; sta WNDBTM
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; note: calling HLINE in firmware would take at least 13 bytes
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; below code is 9
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; we depend on the call to MON_SETGR leaving BASL:BASH set for line 39
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; (thanks to qkumba)
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CLEOL2 = $FCA0 ; on original II, they got rid of it on IIe :(
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; lda #$ff ; 2 bytes shorter on II/II+
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; ldy #0
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; jsr CLEOL2
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SCROLL = $FC70
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WNDTOP = $22
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WNDBTM = $23
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; lda #0
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; sta WNDTOP
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; lda #24
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; sta WNDBTM
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scroll_loop:
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KEYPRESS= $C000
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KEYRESET= $C010
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jsr SCROLL ; scrolls screen up one row ; 3
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;repeat1:
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; lda KEYPRESS
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; bpl repeat1
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; bit KEYRESET
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;======================================
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; re-draw bottom line (row 23) as white
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jsr SCROLL
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lda #$ff ; 2
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; dey ; y is 40 after SCROLL
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; ldy #39 ; 2
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lda #$ff ; top/bottom white ; 2
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; ldy #39 ; Y is left at 40 after SCROLL
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w_loop:
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sta $7cf,Y ; hline 23 (46+47) ; 2
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dey ; 1
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bne w_loop ; 2
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;============
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; 9
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; 8
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fire_loop:
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lda #22 ; start at line 22 ; 2
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sta CV ; ; 2
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lda #22 ; start at line 22 ; 2
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sta CV ; store in Row location ; 2
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yloop:
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; puts address of row CV into BASL:BASH
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jsr VTAB ; 3
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ldy #39
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; loop for X values 39 ... 0
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ldy #39 ; 2
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xloop:
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;=============================
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@ -164,8 +99,10 @@ noEor: sta SEEDL ; 2
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; end inlined RNG
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; Randomly either use current value, or decay by one
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bmi no_change ; assume bit 7 is as random as bit 0 ; 2
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; Lookup the new color in table
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lda (BASL),Y ; load value ; 2
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and #$7 ; mask off ; 2
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tax ; 1
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@ -1,4 +1,12 @@
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5 HOME
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10 PRINT "FIRE DEMO V1.2"
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10 PRINT "FIRE DEMO V1.2 BY DEATER"
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40 PRINT:PRINT
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105 PRINT CHR$ (4)"BRUN FIRE_EXTREME"
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50 PRINT "WHICH DEMO DO YOU WISH TO RUN?"
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60 PRINT "1. FIRE_TINY (105 BYTES)"
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70 PRINT "2. FIRE_FIRMWARE (80 BYTES)"
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80 PRINT "3. FIRE_EXTREME (64 BYTES)"
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90 INPUT A
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100 IF A=1 THEN PRINT CHR$ (4)"BRUN FIRE_TINY"
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110 IF A=2 THEN PRINT CHR$ (4)"BRUN FIRE_FIRMWARE"
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120 IF A=3 THEN PRINT CHR$ (4)"BRUN FIRE_EXTREME"
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130 GOTO 5
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