mirror of
https://github.com/cc65/cc65.git
synced 2024-11-19 21:32:19 +00:00
785 lines
19 KiB
ArmAsm
785 lines
19 KiB
ArmAsm
;
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; Graphics driver for the 280x192x6 mode on the Apple II
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;
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; Stefan Haubenthal <polluks@sdf.lonestar.org>
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; Based on Maciej Witkowiak's circle routine
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;
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.include "zeropage.inc"
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.include "tgi-kernel.inc"
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.include "tgi-mode.inc"
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.include "tgi-error.inc"
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.include "apple2.inc"
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.macpack generic
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; ------------------------------------------------------------------------
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; Header. Includes jump table and constants.
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.segment "JUMPTABLE"
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; First part of the header is a structure that has a magic and defines the
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; capabilities of the driver
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.byte $74, $67, $69 ; "tgi"
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.byte TGI_API_VERSION ; TGI API version number
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xres: .word 280 ; X resolution
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yres: .word 192 ; Y resolution
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.byte 8 ; Number of drawing colors
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.byte 2 ; Number of screens available
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.byte 8 ; System font X size
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.byte 8 ; System font Y size
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.res 4, $00 ; Reserved for future extensions
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; Next comes the jump table. Currently all entries must be valid and may point
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; to an RTS for test versions (function not implemented).
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.word INSTALL
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.word UNINSTALL
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.word INIT
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.word DONE
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.word GETERROR
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.word CONTROL
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.word CLEAR
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.word SETVIEWPAGE
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.word SETDRAWPAGE
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.word SETCOLOR
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.word SETPALETTE
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.word GETPALETTE
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.word GETDEFPALETTE
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.word SETPIXEL
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.word GETPIXEL
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.word LINE
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.word BAR
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.word CIRCLE
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.word TEXTSTYLE
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.word OUTTEXT
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; ------------------------------------------------------------------------
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; Data.
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; Variables mapped to the zero page segment variables. Some of these are
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; used for passing parameters to the driver.
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X1 = ptr1
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Y1 = ptr2
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X2 = ptr3
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Y2 = ptr4
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RADIUS = tmp1
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ADDR = tmp1
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TEMP = tmp3
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TEMP2 = tmp4
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TEMP3 = sreg
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TEMP4 = sreg+1
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; Circle stuff
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XX = ptr3 ; (2) CIRCLE
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YY = ptr4 ; (2) CIRCLE
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MaxO = sreg ; (overwritten by TEMP3+TEMP4, but restored from OG/OU anyway)
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XS = regsave ; (2) CIRCLE
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YS = regsave+2 ; (2) CIRCLE
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; Absolute variables used in the code
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.bss
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ERROR: .res 1 ; Error code
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; Line routine stuff (combined with CIRCLE to save space)
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OGora: .res 2
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OUkos: .res 2
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Y3: .res 2
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; Text output stuff
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TEXTMAGX = $E7
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TEXTMAGY = $E7
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TEXTDIR = $F9
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; Constants and tables
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.rodata
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DEFPALETTE: .byte $00, $05, $04, $01, $00, $08, $06, $01; 6 unique colors
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PALETTESIZE = * - DEFPALETTE
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SHAPE: .byte $64,$01,$d0,$00,$d5,$00,$da,$00,$e0,$00,$ef,$00,$fe,$00,$0c,$01
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.byte $19,$01,$1d,$01,$25,$01,$2d,$01,$3d,$01,$46,$01,$4b,$01,$52,$01
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.byte $56,$01,$60,$01,$70,$01,$77,$01,$83,$01,$8e,$01,$9a,$01,$a7,$01
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.byte $b6,$01,$bf,$01,$ce,$01,$dd,$01,$e2,$01,$e7,$01,$f9,$01,$03,$02
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.byte $15,$02,$1f,$02,$32,$02,$42,$02,$52,$02,$5e,$02,$6c,$02,$79,$02
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.byte $85,$02,$91,$02,$a1,$02,$a9,$02,$b2,$02,$bf,$02,$c5,$02,$d5,$02
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.byte $e5,$02,$f4,$02,$00,$03,$10,$03,$1f,$03,$2d,$03,$35,$03,$44,$03
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.byte $53,$03,$63,$03,$71,$03,$7b,$03,$85,$03,$91,$03,$97,$03,$a3,$03
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.byte $b6,$03,$bf,$03,$c3,$03,$cf,$03,$dc,$03,$e4,$03,$f3,$03,$00,$04
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.byte $0a,$04,$19,$04,$25,$04,$2a,$04,$32,$04,$3c,$04,$43,$04,$50,$04
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.byte $5a,$04,$66,$04,$72,$04,$7e,$04,$87,$04,$94,$04,$9c,$04,$a8,$04
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.byte $b4,$04,$c1,$04,$cc,$04,$db,$04,$e6,$04,$ee,$04,$f3,$04,$fb,$04
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.byte $04,$05,$1a,$05,$1f,$05,$24,$05,$29,$05,$22,$01,$00,$00,$00,$00
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.byte $09,$89,$92,$92,$00,$36,$36,$16,$0e,$00,$0d,$fe,$6e,$96,$52,$00
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.byte $69,$fe,$17,$2d,$2d,$1e,$1f,$17,$2d,$2d,$1e,$1f,$6e,$4e,$00,$09
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.byte $8d,$3f,$bf,$0d,$15,$3f,$0e,$0d,$1e,$3f,$77,$71,$09,$00,$6d,$11
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.byte $df,$77,$09,$1e,$17,$4d,$3a,$df,$4e,$29,$0e,$00,$a9,$1f,$6e,$1e
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.byte $17,$0d,$0d,$1e,$df,$0e,$6d,$0e,$00,$36,$96,$52,$00,$09,$1e,$17
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.byte $36,$15,$0e,$0e,$00,$15,$0e,$36,$1e,$17,$4e,$01,$00,$09,$8d,$1f
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.byte $1f,$0e,$2d,$1e,$17,$2d,$15,$1f,$1f,$4e,$4e,$01,$00,$89,$6e,$3a
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.byte $3f,$77,$31,$56,$09,$00,$92,$8a,$f6,$0d,$00,$52,$89,$3f,$b7,$52
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.byte $49,$00,$92,$92,$0e,$00,$49,$11,$17,$1e,$17,$1e,$56,$49,$01,$00
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.byte $29,$ad,$df,$33,$4d,$35,$1f,$1f,$2e,$4d,$fe,$1b,$0e,$2d,$4e,$00
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.byte $31,$77,$36,$be,$2d,$0e,$00,$29,$ad,$df,$73,$49,$1e,$bf,$1e,$2e
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.byte $2d,$75,$00,$2d,$2d,$be,$3e,$4e,$fe,$1b,$0e,$2d,$4e,$00,$49,$3e
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.byte $17,$0d,$fe,$33,$2d,$2d,$1e,$76,$01,$00,$2d,$2d,$de,$1b,$2e,$2d
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.byte $15,$36,$df,$73,$2d,$4e,$00,$09,$2d,$de,$bb,$4d,$3a,$3f,$6e,$09
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.byte $fe,$1b,$0e,$2d,$4e,$00,$2d,$2d,$be,$1e,$17,$36,$4e,$09,$00,$29
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.byte $ad,$df,$33,$4d,$f1,$3f,$17,$4d,$31,$df,$73,$2d,$4e,$00,$29,$ad
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.byte $df,$33,$4d,$31,$3f,$77,$09,$1e,$df,$2a,$75,$09,$00,$12,$16,$96
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.byte $01,$00,$52,$b2,$f6,$0d,$00,$49,$3e,$17,$2d,$2d,$35,$3f,$3f,$3f
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.byte $0e,$2d,$2d,$f5,$1b,$77,$4e,$09,$00,$12,$2d,$2d,$de,$9b,$2d,$2d
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.byte $96,$01,$00,$49,$15,$ff,$13,$2d,$2d,$ad,$3f,$3f,$3f,$2e,$2d,$2d
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.byte $1e,$37,$4e,$09,$00,$29,$ad,$df,$73,$09,$1e,$b6,$4e,$01,$00,$09
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.byte $2d,$3e,$37,$2d,$3e,$ff,$2a,$2d,$2d,$f5,$3f,$3f,$0e,$2d,$1e,$4d
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.byte $01,$00,$09,$15,$1f,$17,$4d,$31,$df,$33,$2d,$2d,$fe,$1b,$6e,$09
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.byte $0e,$00,$2d,$ad,$df,$33,$4d,$f1,$3f,$37,$4d,$31,$df,$33,$2d,$75
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.byte $01,$00,$29,$ad,$df,$33,$36,$4d,$11,$df,$73,$2d,$4e,$00,$2d,$ad
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.byte $df,$6e,$31,$df,$6e,$31,$df,$17,$2d,$75,$01,$00,$2d,$2d,$de,$1b
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.byte $6e,$11,$3f,$37,$36,$2d,$2d,$0e,$00,$2d,$2d,$de,$1b,$6e,$11,$3f
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.byte $37,$36,$4e,$49,$00,$29,$ad,$df,$33,$36,$4d,$35,$df,$73,$2d,$75
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.byte $00,$4d,$31,$df,$33,$4d,$31,$3f,$3f,$6e,$09,$fe,$1b,$6e,$09,$0e
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.byte $00,$2d,$1e,$36,$36,$17,$2d,$0e,$00,$49,$31,$36,$36,$df,$73,$2d
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.byte $4e,$00,$4d,$f1,$df,$6e,$1e,$37,$0d,$15,$df,$6e,$09,$0e,$00,$36
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.byte $36,$36,$2d,$75,$00,$4d,$31,$ff,$37,$0d,$0d,$fe,$1f,$6e,$09,$fe
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.byte $1b,$6e,$09,$0e,$00,$4d,$31,$df,$33,$6d,$31,$1f,$1f,$6e,$29,$fe
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.byte $1b,$6e,$09,$0e,$00,$29,$ad,$df,$33,$4d,$31,$df,$33,$4d,$31,$df
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.byte $73,$2d,$4e,$00,$2d,$ad,$df,$33,$4d,$f1,$3f,$37,$36,$4e,$49,$00
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.byte $29,$ad,$df,$33,$4d,$31,$df,$33,$0d,$0d,$1e,$df,$0e,$6d,$0e,$00
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.byte $2d,$ad,$df,$33,$4d,$f1,$3f,$37,$0d,$15,$df,$6e,$09,$0e,$00,$29
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.byte $ad,$df,$33,$4d,$3a,$77,$09,$fe,$1b,$0e,$2d,$4e,$00,$2d,$2d,$de
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.byte $36,$36,$76,$09,$00,$4d,$31,$df,$33,$4d,$31,$df,$33,$4d,$31,$df
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.byte $73,$2d,$4e,$00,$4d,$31,$df,$33,$4d,$31,$df,$33,$4d,$f1,$1f,$0e
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.byte $4e,$01,$00,$4d,$31,$df,$33,$4d,$31,$1f,$1f,$6e,$0d,$3e,$1f,$37
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.byte $4d,$71,$00,$4d,$31,$df,$73,$0d,$1e,$17,$0d,$15,$df,$33,$4d,$71
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.byte $00,$4d,$31,$df,$73,$0d,$1e,$36,$76,$09,$00,$2d,$2d,$be,$1e,$17
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.byte $1e,$2e,$2d,$75,$00,$2d,$2d,$de,$3b,$2e,$3e,$2e,$3e,$2e,$2d,$75
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.byte $00,$72,$15,$0e,$15,$56,$00,$2d,$2d,$3e,$2e,$3e,$2e,$3e,$df,$2a
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.byte $2d,$75,$00,$49,$15,$3f,$17,$2d,$2d,$15,$3f,$3f,$3f,$4e,$2d,$3e
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.byte $37,$2d,$3e,$6f,$49,$00,$92,$92,$49,$11,$3f,$3f,$4d,$09,$00,$76
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.byte $96,$52,$00,$52,$2d,$35,$df,$33,$4d,$31,$ff,$73,$6d,$0e,$00,$36
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.byte $2d,$ad,$df,$33,$4d,$31,$df,$33,$2d,$75,$01,$00,$52,$2d,$de,$33
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.byte $76,$2d,$0e,$00,$49,$31,$df,$2a,$2d,$fe,$1b,$6e,$09,$fe,$1b,$0e
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.byte $2d,$75,$00,$52,$2d,$15,$df,$33,$2d,$2d,$de,$1b,$0e,$2d,$75,$00
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.byte $09,$f5,$33,$8d,$3f,$77,$36,$4e,$01,$00,$52,$2d,$35,$df,$33,$4d
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.byte $31,$3f,$77,$09,$1e,$3f,$4d,$01,$00,$36,$2d,$ad,$df,$33,$4d,$31
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.byte $df,$33,$4d,$71,$00,$16,$36,$36,$0e,$00,$09,$9e,$35,$36,$f6,$6f
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.byte $01,$00,$36,$4d,$1e,$1f,$2e,$15,$1f,$6e,$71,$00,$35,$36,$36,$17
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.byte $2d,$0e,$00,$12,$2d,$ad,$1f,$1f,$6e,$0d,$fe,$1f,$6e,$0d,$0e,$00
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.byte $12,$2d,$15,$df,$6e,$31,$df,$6e,$71,$00,$52,$2d,$15,$df,$33,$4d
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.byte $31,$df,$73,$2d,$4e,$00,$12,$2d,$ad,$df,$33,$4d,$f1,$3f,$37,$6e
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.byte $49,$00,$52,$2d,$35,$df,$33,$4d,$31,$3f,$77,$09,$2e,$00,$12,$0d
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.byte $ad,$df,$37,$36,$4e,$49,$00,$52,$2d,$f5,$db,$0e,$2d,$15,$df,$13
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.byte $2d,$75,$01,$00,$31,$17,$2d,$f5,$33,$76,$75,$00,$12,$4d,$31,$df
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.byte $33,$4d,$31,$ff,$73,$6d,$0e,$00,$12,$4d,$31,$df,$33,$4d,$f1,$1f
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.byte $0e,$4e,$01,$00,$12,$4d,$31,$df,$33,$0d,$0d,$fe,$1f,$0e,$0d,$4e
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.byte $00,$12,$4d,$f1,$1f,$0e,$15,$1f,$17,$4d,$71,$00,$12,$4d,$31,$df
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.byte $33,$4d,$31,$3f,$77,$09,$1e,$3f,$4d,$01,$00,$12,$2d,$2d,$1e,$17
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.byte $1e,$17,$2d,$2d,$0e,$00,$09,$f5,$33,$1e,$0e,$76,$75,$00,$36,$36
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.byte $36,$2e,$00,$ad,$ae,$17,$fe,$2a,$4e,$01,$00,$69,$11,$1f,$1f,$4e
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.byte $b1,$92,$09,$00,$2d,$2d,$35,$3f,$3f,$37,$2d,$2d,$35,$3f,$3f,$37
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.byte $2d,$2d,$35,$3f,$3f,$37,$2d,$2d,$75,$00,$40,$c0,$40,$18,$00,$40
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.byte $c0,$40,$43,$00,$40,$c0,$40,$08,$00,$19,$00,$00
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. May
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; initialize anything that has to be done just once. Is probably empty
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; most of the time.
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;
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; Must set an error code: NO
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;
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INSTALL:
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; ------------------------------------------------------------------------
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; UNINSTALL routine. Is called before the driver is removed from memory. May
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; clean up anything done by INSTALL but is probably empty most of the time.
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;
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; Must set an error code: NO
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;
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UNINSTALL:
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rts
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; ------------------------------------------------------------------------
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; INIT: Changes an already installed device from text mode to graphics
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; mode.
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; Note that INIT/DONE may be called multiple times while the driver
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; is loaded, while INSTALL is only called once, so any code that is needed
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; to initializes variables and so on must go here. Setting palette and
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; clearing the screen is not needed because this is called by the graphics
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; kernel later.
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; The graphics kernel will never call INIT when a graphics mode is already
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; active, so there is no need to protect against that.
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;
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; Must set an error code: YES
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;
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INIT:
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; Switch into graphics mode
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jsr HGR
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bit MIXOFF
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; Done, reset the error code
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lda #TGI_ERR_OK
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sta ERROR
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rts
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; ------------------------------------------------------------------------
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; DONE: Will be called to switch the graphics device back into text mode.
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; The graphics kernel will never call DONE when no graphics mode is active,
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; so there is no need to protect against that.
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;
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; Must set an error code: NO
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;
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DONE = TEXT
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; ------------------------------------------------------------------------
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; GETERROR: Return the error code in A and clear it.
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GETERROR:
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ldx #TGI_ERR_OK
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lda ERROR
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stx ERROR
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rts
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; ------------------------------------------------------------------------
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; CONTROL: Platform/driver specific entry point.
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;
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; Must set an error code: YES
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;
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CONTROL:
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lda #TGI_ERR_INV_FUNC
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sta ERROR
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rts
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; ------------------------------------------------------------------------
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; CLEAR: Clears the screen.
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;
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; Must set an error code: NO
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;
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CLEAR = HCLR
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; ------------------------------------------------------------------------
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; SETVIEWPAGE: Set the visible page. Called with the new page in A (0..n).
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; The page number is already checked to be valid by the graphics kernel.
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;
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; Must set an error code: NO (will only be called if page ok)
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;
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SETVIEWPAGE:
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tax
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beq @L1
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bit PG2ON
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rts
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@L1: bit PG2OFF
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rts
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; ------------------------------------------------------------------------
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; SETDRAWPAGE: Set the drawable page. Called with the new page in A (0..n).
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; The page number is already checked to be valid by the graphics kernel.
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;
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; Must set an error code: NO (will only be called if page ok)
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;
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SETDRAWPAGE:
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tax
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beq @L1
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jmp HGR2
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@L1: jmp HGR
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; ------------------------------------------------------------------------
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; SETCOLOR: Set the drawing color (in A). The new color is already checked
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; to be in a valid range (0..maxcolor-1).
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;
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; Must set an error code: NO (will only be called if color ok)
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;
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SETCOLOR:
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tax
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jmp SETHCOL
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; ------------------------------------------------------------------------
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; SETPALETTE: Set the palette (not available with all drivers/hardware).
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; A pointer to the palette is passed in ptr1. Must set an error if palettes
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; are not supported
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;
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; Must set an error code: YES
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;
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SETPALETTE:
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lda #TGI_ERR_INV_FUNC
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sta ERROR
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rts
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; ------------------------------------------------------------------------
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; GETPALETTE: Return the current palette in A/X. Even drivers that cannot
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; set the palette should return the default palette here, so there's no
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; way for this function to fail.
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;
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; Must set an error code: NO
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;
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GETPALETTE:
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; ------------------------------------------------------------------------
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; GETDEFPALETTE: Return the default palette for the driver in A/X. All
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; drivers should return something reasonable here, even drivers that don't
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; support palettes, otherwise the caller has no way to determine the colors
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; of the (not changeable) palette.
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;
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; Must set an error code: NO (all drivers must have a default palette)
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;
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GETDEFPALETTE:
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lda #<DEFPALETTE
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ldx #>DEFPALETTE
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rts
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; ------------------------------------------------------------------------
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; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
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; color. The coordinates passed to this function are never outside the
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; visible screen area, so there is no need for clipping inside this function.
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;
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; Must set an error code: NO
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;
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SETPIXELCLIP:
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lda Y1+1
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bmi @finito ; y<0
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lda X1+1
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bmi @finito ; x<0
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lda X1
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ldx X1+1
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sta ADDR
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stx ADDR+1
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ldx #ADDR
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lda xres
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ldy xres+1
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jsr icmp ; ( x < xres ) ...
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bcs @finito
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lda Y1
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ldx Y1+1
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sta ADDR
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stx ADDR+1
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ldx #ADDR
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lda yres
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ldy yres+1
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jsr icmp ; ... && ( y < yres )
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bcc SETPIXEL
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@finito:rts
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|
||
SETPIXEL:
|
||
ldx X1
|
||
ldy X1+1
|
||
lda Y1
|
||
jmp HPLOT
|
||
|
||
; ------------------------------------------------------------------------
|
||
; GETPIXEL: Read the color value of a pixel and return it in A/X. The
|
||
; coordinates passed to this function are never outside the visible screen
|
||
; area, so there is no need for clipping inside this function.
|
||
|
||
|
||
GETPIXEL:
|
||
ldx X1
|
||
ldy X1+1
|
||
lda Y1
|
||
jsr HPOSN ; 1st pixel
|
||
HBASL = $26
|
||
HMASK = $30
|
||
ldx #0
|
||
lda (HBASL),y
|
||
and HMASK
|
||
beq @L1
|
||
inx
|
||
@L1: stx tmp1
|
||
|
||
lda $E0 ; which neighbour
|
||
tax
|
||
and #$01
|
||
bne @odd
|
||
asl tmp1
|
||
inx
|
||
.byte $24
|
||
@odd: dex
|
||
|
||
ldy $E1
|
||
lda $E2
|
||
jsr HPOSN ; 2nd pixel
|
||
ldx #0
|
||
lda (HBASL),y
|
||
and HMASK
|
||
beq @L2
|
||
inx
|
||
@L2: txa
|
||
ora tmp1
|
||
ldx #0
|
||
rts
|
||
|
||
; ------------------------------------------------------------------------
|
||
; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and
|
||
; X2/Y2 = ptr3/ptr4 using the current drawing color.
|
||
;
|
||
; Must set an error code: NO
|
||
;
|
||
|
||
LINE:
|
||
ldx X1
|
||
ldy X1+1
|
||
lda Y1
|
||
jsr HPOSN
|
||
lda X2
|
||
ldx X2+1
|
||
ldy Y2
|
||
jmp HLIN
|
||
|
||
; ------------------------------------------------------------------------
|
||
; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
|
||
; X1/Y1 = ptr1/ptr2 and X2/Y2 = ptr3/ptr4 using the current drawing color.
|
||
; Contrary to most other functions, the graphics kernel will sort and clip
|
||
; the coordinates before calling the driver, so on entry the following
|
||
; conditions are valid:
|
||
; X1 <= X2
|
||
; Y1 <= Y2
|
||
; (X1 >= 0) && (X1 < XRES)
|
||
; (X2 >= 0) && (X2 < XRES)
|
||
; (Y1 >= 0) && (Y1 < YRES)
|
||
; (Y2 >= 0) && (Y2 < YRES)
|
||
;
|
||
; Must set an error code: NO
|
||
;
|
||
|
||
BAR:
|
||
inc Y2
|
||
@L1: lda Y2
|
||
pha
|
||
lda Y1
|
||
sta Y2
|
||
jsr LINE
|
||
pla
|
||
sta Y2
|
||
inc Y1
|
||
cmp Y1
|
||
bne @L1
|
||
rts
|
||
|
||
; ------------------------------------------------------------------------
|
||
; CIRCLE: Draw a circle around the center X1/Y1 (= ptr1/ptr2) with the
|
||
; radius in tmp1 and the current drawing color.
|
||
;
|
||
; Must set an error code: NO
|
||
;
|
||
|
||
CIRCLE:
|
||
lda RADIUS
|
||
bne @L1
|
||
jmp SETPIXELCLIP ; Plot as a point
|
||
|
||
@L1: sta XX
|
||
; x = r;
|
||
lda #0
|
||
sta XX+1
|
||
sta YY
|
||
sta YY+1
|
||
sta MaxO
|
||
sta MaxO+1
|
||
; y =0; mo=0;
|
||
lda X1
|
||
ldx X1+1
|
||
sta XS
|
||
stx XS+1
|
||
lda Y1
|
||
ldx Y1+1
|
||
sta YS
|
||
stx YS+1 ; XS/YS to remember the center
|
||
|
||
; while (y<x) {
|
||
@L013B: ldx #YY
|
||
lda XX
|
||
ldy XX+1
|
||
jsr icmp
|
||
bcc @L12
|
||
rts
|
||
@L12: ; plot points in 8 slices...
|
||
lda XS
|
||
add XX
|
||
sta X1
|
||
lda XS+1
|
||
adc XX+1
|
||
sta X1+1 ; x1 = xs+x
|
||
lda YS
|
||
add YY
|
||
sta Y1
|
||
pha
|
||
lda YS+1
|
||
adc YY+1
|
||
sta Y1+1 ; (stack)=ys+y, y1=(stack)
|
||
pha
|
||
jsr SETPIXELCLIP ; plot(xs+x,ys+y)
|
||
lda YS
|
||
sub YY
|
||
sta Y1
|
||
sta Y3
|
||
lda YS+1
|
||
sbc YY+1
|
||
sta Y1+1 ; y3 = y1 = ys-y
|
||
sta Y3+1
|
||
jsr SETPIXELCLIP ; plot(xs+x,ys-y)
|
||
pla
|
||
sta Y1+1
|
||
pla
|
||
sta Y1 ; y1 = ys+y
|
||
lda XS
|
||
sub XX
|
||
sta X1
|
||
lda XS+1
|
||
sbc XX+1
|
||
sta X1+1
|
||
jsr SETPIXELCLIP ; plot (xs-x,ys+y)
|
||
lda Y3
|
||
sta Y1
|
||
lda Y3+1
|
||
sta Y1+1
|
||
jsr SETPIXELCLIP ; plot (xs-x,ys-y)
|
||
|
||
lda XS
|
||
add YY
|
||
sta X1
|
||
lda XS+1
|
||
adc YY+1
|
||
sta X1+1 ; x1 = xs+y
|
||
lda YS
|
||
add XX
|
||
sta Y1
|
||
pha
|
||
lda YS+1
|
||
adc XX+1
|
||
sta Y1+1 ; (stack)=ys+x, y1=(stack)
|
||
pha
|
||
jsr SETPIXELCLIP ; plot(xs+y,ys+x)
|
||
lda YS
|
||
sub XX
|
||
sta Y1
|
||
sta Y3
|
||
lda YS+1
|
||
sbc XX+1
|
||
sta Y1+1 ; y3 = y1 = ys-x
|
||
sta Y3+1
|
||
jsr SETPIXELCLIP ; plot(xs+y,ys-x)
|
||
pla
|
||
sta Y1+1
|
||
pla
|
||
sta Y1 ; y1 = ys+x(stack)
|
||
lda XS
|
||
sub YY
|
||
sta X1
|
||
lda XS+1
|
||
sbc YY+1
|
||
sta X1+1
|
||
jsr SETPIXELCLIP ; plot (xs-y,ys+x)
|
||
lda Y3
|
||
sta Y1
|
||
lda Y3+1
|
||
sta Y1+1
|
||
jsr SETPIXELCLIP ; plot (xs-y,ys-x)
|
||
|
||
; og = mo+y+y+1
|
||
lda MaxO
|
||
ldx MaxO+1
|
||
add YY
|
||
tay
|
||
txa
|
||
adc YY+1
|
||
tax
|
||
tya
|
||
add YY
|
||
tay
|
||
txa
|
||
adc YY+1
|
||
tax
|
||
tya
|
||
add #1
|
||
bcc @L0143
|
||
inx
|
||
@L0143: sta OGora
|
||
stx OGora+1
|
||
; ou = og-x-x+1
|
||
sub XX
|
||
tay
|
||
txa
|
||
sbc XX+1
|
||
tax
|
||
tya
|
||
sub XX
|
||
tay
|
||
txa
|
||
sbc XX+1
|
||
tax
|
||
tya
|
||
add #1
|
||
bcc @L0146
|
||
inx
|
||
@L0146: sta OUkos
|
||
stx OUkos+1
|
||
; ++y
|
||
inc YY
|
||
bne @L0148
|
||
inc YY+1
|
||
@L0148: ; if (abs(ou)<abs(og))
|
||
lda OUkos
|
||
ldy OUkos+1
|
||
jsr abs
|
||
sta TEMP3
|
||
sty TEMP4
|
||
lda OGora
|
||
ldy OGora+1
|
||
jsr abs
|
||
ldx #TEMP3
|
||
jsr icmp
|
||
bpl @L0149
|
||
; { --x;
|
||
lda XX
|
||
sub #1
|
||
sta XX
|
||
bcs @L014E
|
||
dec XX+1
|
||
@L014E: ; mo = ou; }
|
||
lda OUkos
|
||
ldx OUkos+1
|
||
jmp @L014G
|
||
; else { mo = og }
|
||
@L0149: lda OGora
|
||
ldx OGora+1
|
||
@L014G: sta MaxO
|
||
stx MaxO+1
|
||
; }
|
||
jmp @L013B
|
||
|
||
; ------------------------------------------------------------------------
|
||
; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in X and Y
|
||
; direction is passend in X/Y, the text direction is passed in A.
|
||
;
|
||
; Must set an error code: NO
|
||
;
|
||
|
||
TEXTSTYLE:
|
||
stx TEXTMAGX
|
||
sty TEXTMAGY
|
||
asl ; 16 <=> 90<39>
|
||
asl
|
||
asl
|
||
asl
|
||
sta TEXTDIR
|
||
rts
|
||
|
||
|
||
; ------------------------------------------------------------------------
|
||
; OUTTEXT: Output text at X/Y = ptr1/ptr2 using the current color and the
|
||
; current text style. The text to output is given as a zero terminated
|
||
; string with address in ptr3.
|
||
;
|
||
; Must set an error code: NO
|
||
;
|
||
|
||
OUTTEXT:
|
||
ldx X1
|
||
ldy X1+1
|
||
lda Y1
|
||
jsr HPOSN
|
||
lda SHAPE+2*99
|
||
add #<SHAPE
|
||
sta tmp3
|
||
lda SHAPE+2*99+1
|
||
adc #>SHAPE
|
||
sta tmp3+1
|
||
|
||
ldy #0
|
||
@L1: lda (ptr3),y
|
||
beq @end
|
||
sub #31 ; no controls
|
||
asl ; offset*2
|
||
tax
|
||
lda SHAPE,x
|
||
add #<SHAPE
|
||
sta tmp1
|
||
lda SHAPE+1,x
|
||
adc #>SHAPE
|
||
sta tmp1+1
|
||
tya
|
||
pha
|
||
ldx tmp1
|
||
ldy tmp1+1
|
||
lda TEXTDIR
|
||
jsr DRAW
|
||
ldx tmp3
|
||
ldy tmp3+1
|
||
lda TEXTDIR
|
||
jsr DRAW
|
||
pla
|
||
tay
|
||
iny
|
||
bne @L1
|
||
@end: rts
|
||
|
||
;-------------
|
||
; copies of some runtime routines
|
||
|
||
abs:
|
||
; a/y := abs(a/y)
|
||
cpy #0
|
||
bpl @L1
|
||
; negay
|
||
clc
|
||
eor #$ff
|
||
adc #1
|
||
pha
|
||
tya
|
||
eor #$ff
|
||
adc #0
|
||
tay
|
||
pla
|
||
@L1: rts
|
||
|
||
icmp:
|
||
; compare a/y to zp,x
|
||
sta TEMP ; TEMP/TEMP2 - arg2
|
||
sty TEMP2
|
||
lda $0,x
|
||
pha
|
||
lda $1,x
|
||
tay
|
||
pla
|
||
tax
|
||
tya ; x/a - arg1 (a=high)
|
||
|
||
sub TEMP2
|
||
bne @L4
|
||
cpx TEMP
|
||
beq @L3
|
||
adc #$ff
|
||
ora #$01
|
||
@L3: rts
|
||
@L4: bvc @L3
|
||
eor #$ff
|
||
ora #$01
|
||
rts
|