766 lines
7.2 KiB
NASM
766 lines
7.2 KiB
NASM
case on
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dummy start
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end
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tables privdata
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;
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; each line is 160 pixels.
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; top/bottom margin is 4 lines (4*160 pixels)
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rows anop
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dc i2'0*8*160+4*160+$2000'
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dc i2'1*8*160+4*160+$2000'
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dc i2'2*8*160+4*160+$2000'
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dc i2'3*8*160+4*160+$2000'
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dc i2'4*8*160+4*160+$2000'
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dc i2'5*8*160+4*160+$2000'
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dc i2'6*8*160+4*160+$2000'
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dc i2'7*8*160+4*160+$2000'
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dc i2'8*8*160+4*160+$2000'
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dc i2'9*8*160+4*160+$2000'
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dc i2'10*8*160+4*160+$2000'
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dc i2'11*8*160+4*160+$2000'
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dc i2'12*8*160+4*160+$2000'
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dc i2'13*8*160+4*160+$2000'
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dc i2'14*8*160+4*160+$2000'
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dc i2'15*8*160+4*160+$2000'
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dc i2'16*8*160+4*160+$2000'
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dc i2'17*8*160+4*160+$2000'
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dc i2'18*8*160+4*160+$2000'
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dc i2'19*8*160+4*160+$2000'
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dc i2'20*8*160+4*160+$2000'
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dc i2'21*8*160+4*160+$2000'
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dc i2'22*8*160+4*160+$2000'
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dc i2'23*8*160+4*160+$2000'
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dc i2'24*8*160+4*160+$2000'
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;
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; columns are simply x * 2
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;
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end
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;
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;ReverseScrollRegion(line1, line2)
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;
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ReverseScrollRegion START
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line2 equ 9
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line1 equ 7
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_rtlb equ 3
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_d equ 1
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using tables
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; brk $ea
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phb
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phd
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tsc
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tcd
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lda <line1
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bmi exit
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lda <line2
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cmp #25
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bcs exit
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lda <line1
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cmp <line2
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bcs exit
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asl line1
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asl line2
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; count = (line2 - line1) * 8 * 160 - 1
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ldx <line2
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lda >rows,x
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clc ; dec a
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ldx <line1
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sbc >rows,x
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pha
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;
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; mvn:
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; while (--a != -1)
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; dest[y++] = dest[x++];
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;
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; mvp:
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; while(--a != -1)
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; dest[y--] = dest[x--];
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; y = dest address = $2000 + 640 + (line2 + 1) * 8 * 160 -1
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; x = src address = dest - 160*8
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ldx <line2
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lda >rows,x
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dec a
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tay
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sec
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sbc #160*8
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tax
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pla ; length
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mvp $e10000,$e10000
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;
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; now empty first line
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;
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ldx <line1
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jsr _ClearLine
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exit anop
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lda <_rtlb
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sta <line1
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lda <_rtlb+2
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sta <line2
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pld
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pla
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pla
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plb
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rtl
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END
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;
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; ScrollRegion(line1, line2);
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;
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ScrollRegion START
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using tables
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line2 equ 9
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line1 equ 7
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_rtlb equ 3
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_d equ 1
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; brk $ea
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phb
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phd
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tsc
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tcd
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lda <line1
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bmi exit
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lda <line2
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cmp #25
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bcs exit
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lda <line1
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cmp <line2
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bcs exit
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asl line1
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asl line2
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; a = (line2 - line1) * 8 * 160 - 1
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ldx <line2
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lda >rows,x
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clc ; dec a
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ldx <line1
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sbc >rows,x
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pha
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; src address = $2000 + line1
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; ldx #$e12000+1920 ; src address
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; ldy #$e12000+640 ; dest address
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; dest = $2000 + 640 + line1 * 8 * 160
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; src = dest + 1280
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ldx <line1
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lda >rows,x
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tay
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clc
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adc #8*160
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tax
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pla ; length
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mvn $e10000,$e10000
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;
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; now empty last line
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;
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ldx line2
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dex
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dex
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jsr _ClearLine
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exit anop
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lda <_rtlb
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sta <line1
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lda <_rtlb+2
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sta <line2
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pld
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pla
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pla
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plb
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rtl
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END
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;
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; scroll 1 line
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;
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;
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ScrollDown START
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using tables
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phb
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;
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; mvn:
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; while (--a != -1)
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; dest[y++] = dest[x++];
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;
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; mvp:
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; while(--a != -1)
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; dest[y--] = dest[x--];
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lda #29440-1 ; length -1 ->23*8*160
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ldx #$e12000+1920 ; src address
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ldy #$e12000+640 ; dest address
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; ldx #$2000+1280
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; ldy #$2000
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mvn $e10000,$e10000
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;
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; now empty outline #24
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;
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ldx #23
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jsr _ClearLine
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plb
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rtl
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END
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; clear line in X (which has been pre-multiplied)
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_ClearLine PRIVATE
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using tables
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lda >rows,x
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tax
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lda #0
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sta >$e10000,x ; stick a 0 in there
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txy ; destination address (src + 2)
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iny
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iny
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lda #8*160-3 ; length -1
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mvn $e10000,$e10000
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rts
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END
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;
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; ClearLine(int line_no); clears the line
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;
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ClearLine START
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line equ 7
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_rtlb equ 3
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_d equ 1
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; brk $ea
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phb
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phd
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tsc
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tcd
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lda <line
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cmp #24
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bcs exit
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asl a
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tax
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jsr _ClearLine
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exit anop
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lda <_rtlb+2
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sta <_rtlb+4
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lda <_rtlb
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sta <_rtlb+2
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pld
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pla
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plb
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rtl
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END
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;
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; ClearScreen2(int start, int end);
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;
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ClearScreen2 START
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using tables
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line2 equ 9
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line1 equ 7
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_rtlb equ 3
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_d equ 1
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; brk $ea
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phb
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phd
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tsc
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tcd
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lda <line1
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bmi exit
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lda line2
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cmp #25
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bcs exit
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lda <line1
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cmp <line2
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bcs exit
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asl line1
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asl line2
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ldx <line2
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lda >rows,x
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clc
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ldx <line1
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sbc >rows,x
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dec a
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dec a
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pha ; save length
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ldx <line2
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lda >rows,x
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tax
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tay
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iny
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iny
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lda #0
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sta >$e1000,x
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pla ; restore length
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mvn $e10000,$e10000
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exit anop
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lda <_rtlb+2
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sta <line2
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lda <_rtlb
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sta <line1
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pld
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pla
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pla
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plb
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rtl
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END
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;
|
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; ClearLine2(int line, int start, int end);
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;
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;
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; clear a section of a given line.
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;
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ClearLine2 START
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using tables
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end equ 11
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start equ 9
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line equ 7
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_rtlb equ 3
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_d equ 1
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phb
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phd
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tsc
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tcd
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pea $e1e1
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plb
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plb
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lda start
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bmi exit
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lda end
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cmp #81
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bcs exit
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lda start
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cmp end
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bcs exit
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sec
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lda end
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sbc start
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; bmi exit
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; beq exit
|
|
tay ; counter
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|
asl start ; x 2
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asl line
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ldx <line
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lda >rows,x
|
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|
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clc
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adc start
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tax
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loop anop
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stz |0,x
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stz |160,x
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stz |320,x
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stz |480,x
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stz |640,x
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stz |800,x
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stz |960,x
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stz |1120,x
|
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inx
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inx
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dey
|
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bne loop
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exit anop
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|
|
lda <_rtlb+2
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sta <end
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lda <_rtlb
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sta <start
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pld
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pla
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pla
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pla
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plb
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rtl
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END
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;
|
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; void DrawCursor(int Xpos, int Ypos, int state);
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;
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;
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DrawCursor START
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state equ 13
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Ypos equ 11
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Xpos equ 9
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_rtlb equ 5
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tmp equ 3
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_d equ 1
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phb
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pha ;tmp
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phd
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tsc
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tcd
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lda <Ypos
|
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and #$00ff
|
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xba ; x 256
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sta <tmp
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asl a ; x 512
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asl a ; x 1024
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clc
|
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adc <tmp ; a = Y * 1280
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adc #11*160 ; last row of it
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sta <tmp
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adc <Xpos ; + X * 2
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adc <Xpos
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tax
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lda #$ffff ; assume to draw it
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ldy <state
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bne draw
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lda #0 ; nope!
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draw anop
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|
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sta >$e12000,x
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pld
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pla ;tmp
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pla
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sta 5,s
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pla
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sta 5,s
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pla
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plb
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rtl
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END
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;
|
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; clear the screen to black (or whatnot)
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;
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ClearScreen START
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phb
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pea $e1e1
|
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plb
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plb
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lda #0
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ldy #32000
|
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loop anop
|
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sta |$2000-2,y
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dey
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dey
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bne loop
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plb
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rtl
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END
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;
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; draw a character at the current Xpos & Ypos
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;
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;
|
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; PrintChar(x, y, char, andMask, xorMask)
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PrintChar START
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using tables
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|
|
|
xorMask equ 15
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|
andMask equ 13
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|
char equ 11
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yy equ 9
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xx equ 7
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_rtlb equ 3
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_d equ 1
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; brk $ea
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phb
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phd
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tsc
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tcd
|
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|
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; sanity check on Xpos && Ypos
|
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|
|
ldx xx
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|
cpx #80
|
|
bcc ok2
|
|
|
|
exit2 anop
|
|
brl exit
|
|
|
|
ok2 anop
|
|
ldy yy
|
|
cpy #24
|
|
bcs exit2
|
|
|
|
lda <char
|
|
cmp #$7f
|
|
bcs space
|
|
sec
|
|
sbc #$20
|
|
bmi space
|
|
asl a ; x2
|
|
asl a ; x4
|
|
asl a ; x8
|
|
asl a ; x16
|
|
sta char
|
|
bra ok
|
|
|
|
|
|
space anop
|
|
stz <char
|
|
|
|
ok anop
|
|
|
|
pea $e1e1
|
|
plb
|
|
plb
|
|
|
|
asl xx
|
|
asl yy
|
|
|
|
ldx yy
|
|
lda >rows,x
|
|
clc
|
|
adc xx
|
|
tay
|
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|
|
|
|
;
|
|
; $e12000 + pos = location to start drawing the character
|
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;
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;
|
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; each char takes up 16 bytes :. the offset is (char - $20) * 16
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;
|
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|
|
ldx char
|
|
lda >CHAR_SPACE,x
|
|
eor <xorMask
|
|
and <andMask
|
|
sta |0,y ; blast it to the screen
|
|
|
|
lda >CHAR_SPACE+2,x
|
|
eor <xorMask
|
|
and <andMask
|
|
sta |160,y
|
|
|
|
lda >CHAR_SPACE+4,x
|
|
eor <xorMask
|
|
and <andMask
|
|
sta |320,y
|
|
|
|
lda >CHAR_SPACE+6,x
|
|
eor <xorMask
|
|
and <andMask
|
|
sta |480,y
|
|
|
|
lda >CHAR_SPACE+8,x
|
|
eor <xorMask
|
|
and <andMask
|
|
sta |640,y
|
|
|
|
lda >CHAR_SPACE+10,x
|
|
eor <xorMask
|
|
and <andMask
|
|
sta |800,y
|
|
|
|
lda >CHAR_SPACE+12,x
|
|
eor <xorMask
|
|
and <andMask
|
|
sta |960,y
|
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|
|
lda >CHAR_SPACE+14,x
|
|
eor <xorMask
|
|
and <andMask
|
|
sta |1120,y
|
|
|
|
exit anop
|
|
|
|
lda <_rtlb+2
|
|
sta <xorMask
|
|
lda <_rtlb
|
|
sta <andMask
|
|
pld
|
|
pla
|
|
pla
|
|
pla
|
|
pla
|
|
pla
|
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plb
|
|
rtl
|
|
end
|
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|
|
;Cursor START
|
|
|
|
;StartCursor ENTRY
|
|
|
|
; pha
|
|
;; ~ReadBParam #$2f
|
|
; pla
|
|
; sta blinkRate
|
|
|
|
; stz savedX
|
|
; stz savedY
|
|
|
|
;; ~SetHeartBeat #CursorHB
|
|
; rtl
|
|
|
|
|
|
;StopCursor ENTRY
|
|
;; ~DelHeartBeat #CursorHB
|
|
; rtl
|
|
|
|
;notSafe ENTRY
|
|
; ds 2
|
|
;blinkRate ds 2
|
|
;savedX ds 2
|
|
;savedY ds 2
|
|
|
|
;CursorHB anop
|
|
; dc i4'0'
|
|
;count dc i2'30'
|
|
; dc h'5AA5'
|
|
|
|
; longa off
|
|
|
|
; phb
|
|
; phk
|
|
; plb
|
|
; php
|
|
|
|
;; long ai
|
|
; lda notSafe
|
|
; bne exit
|
|
|
|
; lda Xpos
|
|
; cmp savedX
|
|
; bne moved
|
|
; lda Ypos
|
|
; cmp savedY
|
|
; bne moved
|
|
; bra exit
|
|
|
|
;moved jsr drawCursor
|
|
|
|
|
|
;exit anop
|
|
|
|
; plp
|
|
; plb
|
|
; clc
|
|
; rtl
|
|
|
|
;drawCursor anop
|
|
|
|
; rts
|
|
|
|
; END
|