mirror of
https://gitlab.com/camelot/kickc.git
synced 2024-10-21 17:24:39 +00:00
435 lines
7.6 KiB
NASM
435 lines
7.6 KiB
NASM
// Illustrates problem with bitmap-draw.kc line()
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// Reported by Janne Johansson
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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.const VIC_BMM = $20
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.const VIC_DEN = $10
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.const VIC_RSEL = 8
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.label BORDER_COLOR = $d020
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.label BG_COLOR = $d021
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.label D011 = $d011
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.label VIC_MEMORY = $d018
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.label SCREEN = $400
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.label BITMAP = $2000
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.label next = 2
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main: {
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// *BORDER_COLOR = 0
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lda #0
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sta BORDER_COLOR
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// *BG_COLOR = 0
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sta BG_COLOR
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// *D011 = VIC_BMM|VIC_DEN|VIC_RSEL|3
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lda #VIC_BMM|VIC_DEN|VIC_RSEL|3
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sta D011
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// *VIC_MEMORY = (byte)((((word)SCREEN&$3fff)/$40)|(((word)BITMAP&$3fff)/$400))
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lda #(SCREEN&$3fff)/$40|(BITMAP&$3fff)/$400
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sta VIC_MEMORY
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// bitmap_init(BITMAP)
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jsr bitmap_init
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// bitmap_clear()
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jsr bitmap_clear
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// init_screen()
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jsr init_screen
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lda #0
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sta.z next
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__b1:
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// bitmap_line(0,next,0,100)
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lda.z next
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jsr bitmap_line
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// next++;
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inc.z next
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jmp __b1
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}
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// Draw a line on the bitmap
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// bitmap_line(byte register(A) x1)
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bitmap_line: {
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.label x0 = 0
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.label y0 = 0
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.label y1 = $64
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// if(x0<x1)
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cmp #x0
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beq !+
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bcs __b1
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!:
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// xd = x0-x1
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tax
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// if(yd<xd)
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cpx #y1
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beq !+
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bcs __b4
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!:
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// bitmap_line_ydxd(y0, x0, y1, yd, xd)
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stx.z bitmap_line_ydxd.xd
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jsr bitmap_line_ydxd
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// }
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rts
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__b4:
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// bitmap_line_xdyd(x1, y1, x0, xd, yd)
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sta.z bitmap_line_xdyd.x
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stx.z bitmap_line_xdyd.xd
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jsr bitmap_line_xdyd
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rts
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__b1:
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// xd = x1-x0
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tax
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// if(yd<xd)
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cpx #y1
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beq !+
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bcs __b7
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!:
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// bitmap_line_ydxi(y0, x0, y1, yd, xd)
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stx.z bitmap_line_ydxi.xd
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jsr bitmap_line_ydxi
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rts
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__b7:
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// bitmap_line_xdyi(x0, y0, x1, xd, yd)
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sta.z bitmap_line_xdyi.x1
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stx.z bitmap_line_xdyi.xd
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jsr bitmap_line_xdyi
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rts
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}
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// bitmap_line_xdyi(byte zp(3) x, byte zp(4) y, byte zp($b) x1, byte zp(6) xd)
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bitmap_line_xdyi: {
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.label x1 = $b
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.label xd = 6
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.label x = 3
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.label e = 5
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.label y = 4
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lda #bitmap_line.y1>>1
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sta.z e
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lda #bitmap_line.y0
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sta.z y
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lda #bitmap_line.x0
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sta.z x
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__b1:
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// bitmap_plot(x,y)
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ldx.z x
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ldy.z y
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jsr bitmap_plot
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// x++;
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inc.z x
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// e = e+yd
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lax.z e
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axs #-[bitmap_line.y1]
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stx.z e
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// if(xd<e)
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lda.z xd
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cmp.z e
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bcs __b2
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// y++;
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inc.z y
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// e = e - xd
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txa
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sec
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sbc.z xd
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sta.z e
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__b2:
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// x1+1
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ldx.z x1
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inx
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// while (x!=(x1+1))
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cpx.z x
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bne __b1
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// }
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rts
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}
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// bitmap_plot(byte register(X) x, byte register(Y) y)
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bitmap_plot: {
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.label plotter_x = 7
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.label plotter_y = 9
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.label plotter = 7
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// plotter_x = { bitmap_plot_xhi[x], bitmap_plot_xlo[x] }
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lda bitmap_plot_xhi,x
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sta.z plotter_x+1
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lda bitmap_plot_xlo,x
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sta.z plotter_x
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// plotter_y = { bitmap_plot_yhi[y], bitmap_plot_ylo[y] }
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lda bitmap_plot_yhi,y
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sta.z plotter_y+1
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lda bitmap_plot_ylo,y
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sta.z plotter_y
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// plotter_x+plotter_y
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lda.z plotter
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clc
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adc.z plotter_y
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sta.z plotter
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lda.z plotter+1
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adc.z plotter_y+1
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sta.z plotter+1
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// *plotter | bitmap_plot_bit[x]
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lda bitmap_plot_bit,x
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ldy #0
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ora (plotter),y
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// *plotter = *plotter | bitmap_plot_bit[x]
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sta (plotter),y
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// }
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rts
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}
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// bitmap_line_ydxi(byte zp(4) y, byte zp(3) x, byte zp(6) xd)
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bitmap_line_ydxi: {
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.label xd = 6
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.label e = 5
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.label y = 4
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.label x = 3
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// e = xd>>1
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lda.z xd
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lsr
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sta.z e
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lda #bitmap_line.y0
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sta.z y
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lda #bitmap_line.x0
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sta.z x
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__b1:
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// bitmap_plot(x,y)
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ldx.z x
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ldy.z y
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jsr bitmap_plot
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// y++;
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inc.z y
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// e = e+xd
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lda.z e
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clc
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adc.z xd
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sta.z e
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// if(yd<e)
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lda #bitmap_line.y1
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cmp.z e
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bcs __b2
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// x++;
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inc.z x
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// e = e - yd
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lax.z e
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axs #bitmap_line.y1
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stx.z e
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__b2:
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// while (y!=(y1+1))
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lda #bitmap_line.y1+1
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cmp.z y
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bne __b1
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// }
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rts
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}
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// bitmap_line_xdyd(byte zp(3) x, byte zp(4) y, byte zp(6) xd)
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bitmap_line_xdyd: {
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.label x = 3
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.label xd = 6
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.label e = 5
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.label y = 4
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lda #bitmap_line.y1>>1
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sta.z e
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lda #bitmap_line.y1
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sta.z y
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__b1:
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// bitmap_plot(x,y)
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ldx.z x
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ldy.z y
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jsr bitmap_plot
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// x++;
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inc.z x
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// e = e+yd
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lax.z e
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axs #-[bitmap_line.y1]
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stx.z e
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// if(xd<e)
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lda.z xd
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cmp.z e
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bcs __b2
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// y--;
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dec.z y
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// e = e - xd
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txa
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sec
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sbc.z xd
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sta.z e
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__b2:
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// while (x!=(x1+1))
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lda #1
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cmp.z x
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bne __b1
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// }
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rts
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}
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// bitmap_line_ydxd(byte zp(4) y, byte zp(3) x, byte zp(6) xd)
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bitmap_line_ydxd: {
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.label xd = 6
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.label e = 5
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.label y = 4
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.label x = 3
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// e = xd>>1
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lda.z xd
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lsr
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sta.z e
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lda #bitmap_line.y0
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sta.z y
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lda #bitmap_line.x0
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sta.z x
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__b1:
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// bitmap_plot(x,y)
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ldx.z x
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ldy.z y
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jsr bitmap_plot
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// y = y++;
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inc.z y
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// e = e+xd
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lda.z e
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clc
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adc.z xd
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sta.z e
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// if(yd<e)
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lda #bitmap_line.y1
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cmp.z e
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bcs __b2
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// x--;
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dec.z x
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// e = e - yd
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lax.z e
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axs #bitmap_line.y1
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stx.z e
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__b2:
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// while (y!=(y1+1))
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lda #bitmap_line.y1+1
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cmp.z y
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bne __b1
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// }
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rts
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}
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init_screen: {
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.label c = 7
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lda #<SCREEN
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sta.z c
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lda #>SCREEN
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sta.z c+1
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__b1:
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// for(byte* c = SCREEN; c!=SCREEN+$400;c++)
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lda.z c+1
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cmp #>SCREEN+$400
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bne __b2
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lda.z c
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cmp #<SCREEN+$400
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bne __b2
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// }
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rts
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__b2:
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// *c = $14
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lda #$14
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ldy #0
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sta (c),y
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// for(byte* c = SCREEN; c!=SCREEN+$400;c++)
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inc.z c
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bne !+
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inc.z c+1
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!:
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jmp __b1
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}
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// Clear all graphics on the bitmap
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bitmap_clear: {
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.label bitmap = 7
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.label y = 6
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// bitmap = (char*) { bitmap_plot_xhi[0], bitmap_plot_xlo[0] }
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lda bitmap_plot_xlo
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sta.z bitmap
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lda bitmap_plot_xhi
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sta.z bitmap+1
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lda #0
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sta.z y
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__b1:
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ldx #0
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__b2:
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// *bitmap++ = 0
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lda #0
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tay
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sta (bitmap),y
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// *bitmap++ = 0;
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inc.z bitmap
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bne !+
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inc.z bitmap+1
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!:
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// for( char x: 0..199 )
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inx
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cpx #$c8
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bne __b2
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// for( char y: 0..39 )
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inc.z y
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lda #$28
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cmp.z y
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bne __b1
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// }
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rts
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}
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// Initialize the bitmap plotter tables for a specific bitmap
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bitmap_init: {
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.label __10 = $b
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.label yoffs = 7
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ldy #$80
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ldx #0
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__b1:
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// x&$f8
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txa
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and #$f8
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// bitmap_plot_xlo[x] = x&$f8
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sta bitmap_plot_xlo,x
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// bitmap_plot_xhi[x] = >bitmap
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lda #>BITMAP
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sta bitmap_plot_xhi,x
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// bitmap_plot_bit[x] = bits
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tya
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sta bitmap_plot_bit,x
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// bits = bits>>1
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tya
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lsr
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tay
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// if(bits==0)
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cpy #0
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bne __b2
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ldy #$80
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__b2:
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// for(char x : 0..255)
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inx
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cpx #0
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bne __b1
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lda #<0
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sta.z yoffs
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sta.z yoffs+1
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tax
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__b3:
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// y&$7
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lda #7
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sax.z __10
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// <yoffs
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lda.z yoffs
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// y&$7 | <yoffs
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ora.z __10
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// bitmap_plot_ylo[y] = y&$7 | <yoffs
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sta bitmap_plot_ylo,x
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// >yoffs
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lda.z yoffs+1
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// bitmap_plot_yhi[y] = >yoffs
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sta bitmap_plot_yhi,x
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// if((y&$7)==7)
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lda #7
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cmp.z __10
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bne __b4
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// yoffs = yoffs + 40*8
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clc
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lda.z yoffs
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adc #<$28*8
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sta.z yoffs
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lda.z yoffs+1
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adc #>$28*8
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sta.z yoffs+1
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__b4:
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// for(char y : 0..255)
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inx
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cpx #0
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bne __b3
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// }
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rts
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}
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// Tables for the plotter - initialized by calling bitmap_draw_init();
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bitmap_plot_xlo: .fill $100, 0
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bitmap_plot_xhi: .fill $100, 0
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bitmap_plot_ylo: .fill $100, 0
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bitmap_plot_yhi: .fill $100, 0
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bitmap_plot_bit: .fill $100, 0
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