hgr: thick lines
This commit is contained in:
Vince Weaver
parent
a25a133d6d
commit
21d3c1b289
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@ -8,10 +8,11 @@ EMPTYDISK = ../../../empty_disk/empty.dsk
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all: plasma_hgr.dsk
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plasma_hgr.dsk: HELLO OVAL PURPLE_WAVES ZEBRA JAWS TWIST OVAL_FLIP MOVING \
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MIRROR THICK_SINE
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MIRROR THICK_SINE THICK_LINES
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cp $(EMPTYDISK) plasma_hgr.dsk
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$(DOS33) -y plasma_hgr.dsk SAVE A HELLO
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$(DOS33) -y plasma_hgr.dsk BSAVE -a 0x3F5 THICK_SINE
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$(DOS33) -y plasma_hgr.dsk BSAVE -a 0x3F5 THICK_LINES
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$(DOS33) -y plasma_hgr.dsk BSAVE -a 0xc00 OVAL
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$(DOS33) -y plasma_hgr.dsk BSAVE -a 0xc00 PURPLE_WAVES
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$(DOS33) -y plasma_hgr.dsk BSAVE -a 0xc00 ZEBRA
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@ -52,6 +53,14 @@ thick_sine.o: thick_sine.s
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###
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THICK_LINES: thick_lines.o
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ld65 -o THICK_LINES thick_lines.o -C $(LINKERSCRIPTS)/apple2_3f5.inc
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thick_lines.o: thick_lines.s
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ca65 -o thick_lines.o thick_lines.s -l thick_lines.lst
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###
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MOVING: moving.o
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ld65 -o MOVING moving.o -C $(LINKERSCRIPTS)/apple2_3f5.inc
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@ -106,5 +115,5 @@ purple_waves.o: purple_waves.s
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clean:
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rm -f *~ *.o *.lst OVAL PURPLE_WAVES ZEBRA JAWS TWIST OVAL_FLIP \
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THICK_SINE
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THICK_SINE THICK_LINES
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@ -0,0 +1,138 @@
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; thick lines
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; zero page
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GBASL = $26
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GBASH = $27
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YY = $69
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ROW_SUM = $70
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HGR_X = $E0
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HGR_XH = $E1
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HGR_Y = $E2
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HGR_COLOR = $E4
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HGR_PAGE = $E6
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FRAME = $FC
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SUM = $FD
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SAVEX = $FE
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SAVEY = $FF
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; soft-switches
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FULLGR = $C052
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PAGE1 = $C054
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; ROM routines
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HGR2 = $F3D8
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HPOSN = $F411 ; (Y,X),(A) (values stores in HGRX,XH,Y)
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HPLOT0 = $F457 ; plot at (Y,X), (A)
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;================================
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; Clear screen and setup graphics
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;================================
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thick_sine:
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jsr HGR2 ; set hi-res 140x192, page2, fullscreen
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; A and Y both 0 at end
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;==================
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; create sinetable
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;ldy #0 ; Y is 0
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sinetable_loop:
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tya ; 2
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and #$3f ; wrap sine at 63 entries ; 2
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cmp #$20
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php ; save pos/negative for later
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and #$1f
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cmp #$10
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bcc sin_left ; blt
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sin_right:
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; sec carry should be set here
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eor #$FF
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adc #$20 ; 32-X
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sin_left:
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tax
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lda sinetable_base,X ; 4+
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plp
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bcc sin_done
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sin_negate:
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; carry set here
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eor #$ff
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adc #0 ; FIXME: this makes things off by 1
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sin_done:
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sta sinetable,Y
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iny
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bne sinetable_loop
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; Y is 0 at this point?
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;============================
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; main loop
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;============================
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dey
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sty HGR_COLOR ; required
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; though in emulator it defaults to $FF
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draw_circle:
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ldy #0
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sty SAVEY
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blah_smc:
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ldx #0
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stx SAVEX
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circle_loop:
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ldx SAVEX
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lda sinetable,X
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; clc
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asl
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; $60 is midscreen
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adc #$60
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ldx SAVEY
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ldy #0
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jsr HPLOT0 ; plot at (Y,X), (A)
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inc SAVEX
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inc SAVEY
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bne circle_loop
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done:
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inc blah_smc+1
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lda SAVEX
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and #$3f
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cmp #$3f
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bne blah
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lda HGR_COLOR
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eor #$ff
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sta HGR_COLOR
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blah:
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jmp draw_circle
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;sinetable_base:
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; this is actually (32*sin(x))
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; for bot
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; 3F5 - 7d = 378
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; jmp oval
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sinetable=$6000
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sinetable_base=$F5BA
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@ -1,5 +1,9 @@
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; thick sine
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; TODO: could we get this down to 64 bytes?
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; put the sine table in the zero page?
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; only generate 64 bytes of sine?
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; zero page
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GBASL = $26
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@ -73,27 +77,33 @@ sin_done:
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iny
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bne sinetable_loop
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; Y is 0 at this point?
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;============================
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; main loop
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;============================
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dey
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sty HGR_COLOR ; required
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; though in emulator it defaults to $FF
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draw_circle:
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ldy #0
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sty SAVEY
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blah_smc:
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ldx #0
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stx SAVEX
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ldy #0
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sty SAVEY
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circle_loop:
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ldx SAVEX
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; ldy sinetable,X
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; sty SAVEY
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lda sinetable,X
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clc
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; clc
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asl
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; $60 is midscreen
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adc #$60
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ldx SAVEY
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@ -102,6 +112,7 @@ circle_loop:
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jsr HPLOT0 ; plot at (Y,X), (A)
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inc SAVEX
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inc SAVEY
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bne circle_loop
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@ -131,3 +142,4 @@ sinetable_base:
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; jmp oval
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sinetable=$6000
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;sinetable_base=$F5BA
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