gr: stars: see if it will fit in 128 bytes
short answer is no
This commit is contained in:
Vince Weaver
parent
72215d5ec8
commit
4305eedcd2
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@ -12,12 +12,13 @@ all: star.dsk
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$(DOS33):
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cd ../../../utils/dos33fs-utils && make
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star.dsk: $(DOS33) HELLO STAR STARS STARS_BOT
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star.dsk: $(DOS33) HELLO STAR STARS STARS_BOT STARS_128
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cp $(EMPTY_DISK)/empty.dsk star.dsk
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$(DOS33) -y star.dsk SAVE A HELLO
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$(DOS33) -y star.dsk BSAVE -a 0xc00 STAR
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$(DOS33) -y star.dsk BSAVE -a 0xc00 STARS
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$(DOS33) -y star.dsk BSAVE -a 0x36B STARS_BOT
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$(DOS33) -y star.dsk BSAVE -a 0x60 STARS_128
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###
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@ -51,6 +52,15 @@ stars_bot.o: stars_bot.s
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###
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clean:
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rm -f *~ *.o *.lst HELLO STAR STARS STARS_BOT
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STARS_128: stars_128.o
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ld65 -o STARS_128 stars_128.o -C $(LINKERSCRIPTS)/apple2_60_zp.inc
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stars_128.o: stars_128.s
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ca65 -o stars_128.o stars_128.s -l stars_128.lst
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###
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clean:
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rm -f *~ *.o *.lst HELLO STAR STARS STARS_BOT STARS_128
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@ -0,0 +1,224 @@
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; bouncing stars (128B version)
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; by Vince `deater` Weaver
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; 138 bytes -- starting with bot version
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; 135 bytes -- make addresses zero page
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SPEAKER = $C030
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SET_GR = $C050
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SET_TEXT = $C051
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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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HGR2 = $F3D8
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PLOT = $F800 ; PLOT AT Y,A (A colors output, Y preserved)
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GBASCALC = $F847 ; Y in A, put addr in GBASL/GBASH (what is C?)
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SETGR = $FB40
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WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
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GBASL = $26
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GBASH = $27
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YPOS = $56
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XPOS = $57
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PO = $58
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FRAME = $5D
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;PAGE = $5E
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.zeropage
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.globalzp bounce
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.globalzp bitmap
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.globalzp bg_smc
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stars:
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bit SET_GR ; switch to lo-res mode
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bit FULLGR ; set full screen
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main_loop:
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;======================
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; flip page
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;======================
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page_smc:
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lda #0 ; 0 or 1
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tax
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ldy PAGE1,X ; flip page
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eor #$1 ; invert (leaving in A)
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sta page_smc+1 ; save PAGE value (PAGE in A here)
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asl ; make OUTH $4 or $8 depending on value in PAGE
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; which we have in A above or at end of loop
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asl ; (this also sets C to 0)
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adc #4
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sta GBASH
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inc FRAME ; increment frame #
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lda FRAME
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and #$1f ; cycle colors ever 32 frames
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bne no_color_cycle
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inc bg_smc+1
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no_color_cycle:
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lda #100 ; pause a bit
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jsr WAIT
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sta GBASL ; A is 0
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;=================================
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; clear lo-res screen, page1/page2
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;=================================
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; proper with avoiding screen holes is ~25 instructions
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; this is more like 16
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; assume GBASL/GBASH already points to proper $400 or $800
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ldx #4 ; lores is 1k, so 4 pages
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full_loop:
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ldy #$00 ; clear whole page
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bg_smc:
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lda #$54 ; color
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inner_loop:
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sta (GBASL),Y
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dey
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bne inner_loop
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inc GBASH ; point to next page
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dex
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bne full_loop
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; X=0
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; Y=0
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; A=color
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;====================
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; draw the stars
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;====================
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lda #32 ; start from right to save a byte
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;======================
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; draw 8x8 bitmap star
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;======================
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; A is XPOS on entry
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draw_star:
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; calculate YPOS
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sta XPOS
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lsr ; make middle star offset+4 from others
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lsr
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adc FRAME ; look up bounce amount
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and #$7
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tax
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lda bounce,X
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sta YPOS
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ldx #7 ; draw 7 lines
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boxloop:
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txa
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clc
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adc YPOS
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jsr GBASCALC ; calc address of line in X (Y-coord)
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; GBASL is in A at this point
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; is C always 0?
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; clc
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adc XPOS ; adjust to X-coord
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sta GBASL
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; adjust for proper page
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lda page_smc+1 ; want to add 0 or 4 (not 0 or 1)
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asl
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asl ; this sets C to 0
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adc GBASH
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sta GBASH
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;=================
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; draw line
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ldy #7 ; 8-bits wide
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lda bitmap,X ; get low bit of bitmap into carry
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draw_line_loop:
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lsr
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pha
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bcc its_transparent
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lda #$dd ; yellow
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sta (GBASL),Y ; draw on screen
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its_transparent:
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pla
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dey
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bpl draw_line_loop
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dex
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bpl boxloop
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lda XPOS ; move to next position
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; going right to left saves 2 bytes for cmp
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sec
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sbc #16
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; X is $FF here
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; Y is $FF here
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; A is -16 here
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bpl draw_star
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bmi main_loop
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;=================
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; star bitmap
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;=================
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;012|456|
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; @ ;
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; @@ ;
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; @@@@@ ;
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;@@@@@@@ ;
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; @@@@@ ;
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; @@@@@ ;
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; @@ @@ ;
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;@@ @@ ;
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bitmap:
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.byte $10
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.byte $18
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.byte $1f
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.byte $fe
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.byte $7c
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.byte $3e
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.byte $66
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.byte $C3
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bounce:
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.byte 10,11,12,13,13,12,11,10
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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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@ -4,7 +4,7 @@ MEMORY {
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}
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SEGMENTS {
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#CODE: load = RAM, type = ro;
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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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