more sizecoding
This commit is contained in:
Vince Weaver
parent
2cc45e4517
commit
9e83c5498f
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@ -28,8 +28,11 @@
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; 145 bytes -- leave out carry setting
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; 142 bytes -- reduce to 4 colors (from 8)
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; 141 bytes -- don't dex at beginning ($FF close enough)
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; 138 bytes -- no need for jmp at end (not bot)
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.include "hardware.inc"
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; zero page
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GBASH = $27
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MASK = $2E
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@ -45,6 +48,18 @@ BUF1H = $FD
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BUF2L = $FE
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BUF2H = $FF
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; soft switches
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FULLGR = $C052
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LORES = $C056 ; Enable LORES graphics
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; ROM routines
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HGR = $F3E2
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HGR2 = $F3D8
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PLOT = $F800 ;; PLOT AT Y,A
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PLOT1 = $F80E ;; PLOT at (GBASL),Y (need MASK to be $0f or $f0)
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;================================
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; Clear screen and setup graphics
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@ -71,7 +86,7 @@ drops_outer:
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inc FRAME
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lda FRAME
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tay ; save frame for later
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tay ; save frame in Y
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; alternate $20/$28 in BUF1H/BUF2H
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@ -93,7 +108,7 @@ drops_outer:
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; fake random number generator by reading ROM
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lda $E000,Y
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lda $E000,Y ; based on FRAME
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; buffer is 40x48 = roughly 2k?
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; so random top bits = 0..7
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@ -128,17 +143,17 @@ no_drop:
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drops_yloop:
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txa ; YY
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tay ; plot YY,YY
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jsr PLOT ; PLOT Y,A, setting up MASK and putting addr in GBASL/H
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; reset XX to 39
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lda #39 ; XX
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lda #39 ; XX
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sta XX
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tay
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txa ; YY into A
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; plot 39,YY
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jsr PLOT ; PLOT Y,A, setting up MASK and putting addr in GBASL/H
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;=================================
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; xloop
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@ -206,32 +221,3 @@ colors:
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; 0000 0010 0110 1110 0111 1111 1111 1111
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; 0 1 2 3 4 5 6 7
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; for maximum twitter size we enter this program
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; by using the "&" operator which jumps to $3F5
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; we can't load there though as the code would end up overlapping
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; $400 which is the graphics area
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; this is at 38A
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; we want to be at 3F5, so load program at 36B?
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; called by EXECUTE.STATEMENT at $D828
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; which jumps to CHRGET at $00B1
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; which does a RTS to $3F4 at end
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; CHRGET sets up state based on the char that follows the &
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; Z==C==1 is colon
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; Z==1 is EOL (nul)
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; C==0 is digit
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; when we call with " following
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; A=$22 (") X=$FF Y=$5E
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; N=0 V=0 Z=0 C=1
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jmp drops ; entry point from &
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; bcs drops
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@ -7,10 +7,11 @@ EMPTY_DISK = ../../../empty_disk/empty.dsk
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all: sier.dsk
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sier.dsk: HELLO SIER SIER_TINY SIER_64
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sier.dsk: HELLO SIER SIER_BOT SIER_TINY SIER_64
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cp $(EMPTY_DISK) sier.dsk
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$(DOS33) -y sier.dsk SAVE A HELLO
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$(DOS33) -y sier.dsk BSAVE -a 0x36C SIER
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$(DOS33) -y sier.dsk BSAVE -a 0x60 SIER
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$(DOS33) -y sier.dsk BSAVE -a 0x36C SIER_BOT
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$(DOS33) -y sier.dsk BSAVE -a 0x300 SIER_TINY
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$(DOS33) -y sier.dsk BSAVE -a 0x300 SIER_64
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@ -22,13 +23,22 @@ HELLO: hello.bas
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###
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SIER: sier.o
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ld65 -o SIER sier.o -C ./apple2_36c.inc
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ld65 -o SIER sier.o -C ./apple2_60_zp.inc
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sier.o: sier.s
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ca65 -o sier.o sier.s -l sier.lst
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###
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SIER_BOT: sier_bot.o
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ld65 -o SIER_BOT sier_bot.o -C ./apple2_36c.inc
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sier_bot.o: sier_bot.s
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ca65 -o sier_bot.o sier_bot.s -l sier_bot.lst
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###
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SIER_TINY: sier_tiny.o
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ld65 -o SIER_TINY sier_tiny.o -C $(LINKERSCRIPTS)/apple2_300.inc
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@ -0,0 +1,12 @@
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MEMORY {
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ZP: start = $60, size = $90, type = rw;
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RAM: start = $60, size = $8E00, file = %O;
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}
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SEGMENTS {
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#CODE: load = RAM, type = ro;
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#RODATA: load = RAM, type = ro;
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#DATA: load = RAM, type = rw;
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#BSS: load = RAM, type = bss, define = yes;
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ZEROPAGE: load = ZP, type = ro;
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}
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@ -1,8 +1,9 @@
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; sierpinski-like demo
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; based on the code from Hellmood's Memories demo
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; 140 bytes -- enough for appleiibot plus {B11} directive
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; to allow for decompression time
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; by Vince `deater` Weaver <vince@deater.net>
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; for Lovebyte 2021
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; the simple sierpinski you more or less just plot
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; X AND Y
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@ -14,37 +15,63 @@
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; to get speed on 6502/Apple II we change the multiplies to
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; a series of 16-bit 8.8 fixed point adds
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.include "hardware.inc"
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; 140 bytes -- bot demo version
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; 137 bytes -- remvoe & jump
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; 135 bytes -- init with HGR, which sets A=0
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; 133 bytes -- remove ldx #0 in paeg flip code
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; 130 bytes -- load in zero page
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; 128 bytes -- init T_L, T_H as part of zero page since we live there
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; zero page
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GBASH = $27
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MASK = $2E
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COLOR = $30
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;XX = $F7
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XX_TH = $F8
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XX_TL = $F9
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;YY = $FA
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YY_TH = $FB
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YY_TL = $FC
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T_L = $FD
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T_H = $FE
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;T_L = $FD
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;T_H = $FE
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SAVED = $FF
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; Soft switches
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FULLGR = $C052
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PAGE1 = $C054
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PAGE2 = $C055
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LORES = $C056 ; Enable LORES graphics
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; ROM routines
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HGR = $F3E2
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HGR2 = $F3D8
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PLOT1 = $F80E ;; PLOT at (GBASL),Y (need MASK to be $0f or $f0)
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GBASCALC= $F847 ;; take Y-coord/2 in A, put address in GBASL/H ( a trashed, C clear)
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SETGR = $FB40
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.zeropage
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.globalzp T_L,T_H
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;================================
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; Clear screen and setup graphics
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;================================
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sier:
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jsr HGR2 ; set FULLGR, sets A=0
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; be sure to avoid code at E6 if we do this
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bit LORES ; drop down to lo-res
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jsr SETGR ; set lo-res 40x40 mode
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bit FULLGR ; make it 40x48
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lda #0 ; start with multiplier 0
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sta T_L
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sta T_H
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; lda #0 ; start with multiplier 0
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; sta T_L
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; sta T_H
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sier_outer:
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ldx #0 ; YY starts at 0
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stx YY_TL
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stx YY_TH
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@ -65,7 +92,7 @@ sier_yloop:
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bcc even_mask
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ldy #$f0
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.byte $C2 ; bit hack
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.byte $2C ; bit hack
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even_mask:
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ldy #$0f
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sty MASK
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@ -152,26 +179,22 @@ blah_smc:
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; speed up the zoom as it goes
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inc blah_smc+1
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flip_pages:
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ldx #0
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; x is 48
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flip_pages:
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lda draw_page_smc+1 ; DRAW_PAGE
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beq done_page
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inx
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done_page:
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ldy PAGE0,X ; set display page to PAGE1 or PAGE2
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; X=48 ($30) PAGE1=$C054-$30=$C024
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ldy $C024,X ; set display page to PAGE1 or PAGE2
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eor #$4 ; flip draw page between $400/$800
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sta draw_page_smc+1 ; DRAW_PAGE
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jmp sier_outer ; just slightly too far???
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; for maximum twitter size we enter this program
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; by using the "&" operator which jumps to $3F5
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jmp sier_outer ; what can we branch on?
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; we can't load there though as the code would end up overlapping
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; $400 which is the graphics area
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T_L: .byte $00
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T_H: .byte $00
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; this is at 389
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; we want to be at 3F5, so load program at 36C?
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jmp sier ; entry point from &
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@ -0,0 +1,177 @@
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; sierpinski-like demo
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; based on the code from Hellmood's Memories demo
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; 140 bytes -- enough for appleiibot plus {B11} directive
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; to allow for decompression time
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; the simple sierpinski you more or less just plot
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; X AND Y
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; Hellmood's you plot something more or less like
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; COLOR = ( (Y-(X*T)) & (X+(Y*T) ) & 0xf0
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; where T is an incrementing frame value
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; to get speed on 6502/Apple II we change the multiplies to
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; a series of 16-bit 8.8 fixed point adds
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.include "hardware.inc"
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GBASH = $27
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MASK = $2E
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COLOR = $30
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;XX = $F7
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XX_TH = $F8
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XX_TL = $F9
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;YY = $FA
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YY_TH = $FB
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YY_TL = $FC
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T_L = $FD
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T_H = $FE
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SAVED = $FF
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;================================
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; Clear screen and setup graphics
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;================================
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sier:
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jsr SETGR ; set lo-res 40x40 mode
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bit FULLGR ; make it 40x48
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lda #0 ; start with multiplier 0
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sta T_L
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sta T_H
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sier_outer:
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ldx #0 ; YY starts at 0
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stx YY_TL
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stx YY_TH
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sier_yloop:
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; calc YY_T (8.8 fixed point add)
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; save space by skipping clc as it's only a slight variation w/o
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; clc
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lda YY_TL
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adc T_L
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sta YY_TL
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lda YY_TH
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adc T_H
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sta YY_TH
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txa ; YY ; plot call needs Y/2
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lsr
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bcc even_mask
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ldy #$f0
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.byte $2C ; bit hack
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even_mask:
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ldy #$0f
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sty MASK
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jsr GBASCALC ; take Y-coord/2 in A, put address in GBASL/H ( a trashed, C clear)
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lda GBASH
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draw_page_smc:
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adc #0
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sta GBASH ; adjust for PAGE1/PAGE2 ($400/$800)
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; reset XX to 0
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ldy #0 ; XX
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sty XX_TL
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sty XX_TH
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sier_xloop:
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; want (YY-(XX*T)) & (XX+(YY*T)
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; SAVED = XX+(Y*T)
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; clc
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tya ; XX
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adc YY_TH
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sta SAVED
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; calc XX*T
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; clc
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lda XX_TL
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adc T_L
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sta XX_TL
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lda XX_TH
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adc T_H
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sta XX_TH
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; calc (YY-X_T)
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txa ; lda YY
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sec
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sbc XX_TH
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; want (YY-(XX*T)) & (XX+(YY*T)
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and SAVED
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and #$f0
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beq green
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black:
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lda #00 ; black
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.byte $2C ; bit trick
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green:
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lda #$CC ; green
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sta COLOR
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; XX value already in Y
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jsr PLOT1 ; PLOT AT (GBASL),Y
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iny ; XX
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cpy #40
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bne sier_xloop
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inx ; YY
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cpx #48
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bne sier_yloop
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; inc T
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; clc
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lda T_L
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blah_smc:
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adc #1
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sta T_L
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lda T_H
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adc #0
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sta T_H
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; speed up the zoom as it goes
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inc blah_smc+1
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flip_pages:
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ldx #0
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lda draw_page_smc+1 ; DRAW_PAGE
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beq done_page
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inx
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done_page:
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ldy PAGE0,X ; set display page to PAGE1 or PAGE2
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eor #$4 ; flip draw page between $400/$800
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sta draw_page_smc+1 ; DRAW_PAGE
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jmp sier_outer ; just slightly too far???
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; for maximum twitter size we enter this program
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; by using the "&" operator which jumps to $3F5
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; we can't load there though as the code would end up overlapping
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; $400 which is the graphics area
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; this is at 389
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; we want to be at 3F5, so load program at 36C?
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jmp sier ; entry point from &
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