mirror of
https://github.com/cc65/cc65.git
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feae688346
Apple machines. git-svn-id: svn://svn.cc65.org/cc65/trunk@3816 b7a2c559-68d2-44c3-8de9-860c34a00d81
774 lines
20 KiB
ArmAsm
774 lines
20 KiB
ArmAsm
;
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; Graphics driver for the 280x192x8 mode on the Apple II
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;
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; Stefan Haubenthal <polluks@sdf.lonestar.org>
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; Oliver Schmidt <ol.sc@web.de>
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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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; Zero page stuff
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HBASL := $26
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HMASK := $30
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PAGE := $E6
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SCALE := $E7
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ROT := $F9
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; Graphics entry points, by cbmnut (applenut??) cbmnut@hushmail.com
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TEXT := $F399 ; Return to text screen
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HGR2 := $F3D8 ; Initialize and clear hi-res page 2.
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HGR := $F3E2 ; Initialize and clear hi-res page 1.
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HCLR := $F3F2 ; Clear the current hi-res screen to black.
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BKGND := $F3F6 ; Clear the current hi-res screen to the
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; last plotted color (from ($1C).
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HPOSN := $F411 ; Positions the hi-res cursor without
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; plotting a point.
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; Enter with (A) = Y-coordinate, and
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; (Y,X) = X-coordinate.
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HPLOT := $F457 ; Calls HPOSN and tries to plot a dot at
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; the cursor's position. If you are
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; trying to plot a non-white color at
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; a complementary color position, no
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; dot will be plotted.
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HLIN := $F53A ; Draws a line from the last plotted
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; point or line destination to:
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; (X,A) = X-coordinate, and
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; (Y) = Y-coordinate.
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HFIND := $F5CB ; Converts the hi-res coursor's position
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; back to X- and Y-coordinates; stores
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; X-coordinate at $E0,E1 and Y-coordinate
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; at $E2.
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DRAW := $F601 ; Draws a shape. Enter with (Y,X) = the
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; address of the shape table, and (A) =
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; the rotation factor. Uses the current
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; color.
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XDRAW := $F65D ; Draws a shape by inverting the existing
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; color of the dots the shape draws over.
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; Same entry parameters as DRAW.
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SETHCOL := $F6EC ; Set the hi-res color to (X), where (X)
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; must be between 0 and 7.
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; ------------------------------------------------------------------------
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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 ; (2) SETPIXELCLIP
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TEMP := tmp3 ; icmp
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TEMP2 := tmp4 ; icmp
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XX := ptr3 ; (2) CIRCLE
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YY := ptr4 ; (2) CIRCLE
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TEMP3 := sreg ; CIRCLE
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TEMP4 := sreg+1 ; 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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; ------------------------------------------------------------------------
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.segment "JUMPTABLE"
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; Header. Includes jump table and constants.
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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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.addr INSTALL
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.addr UNINSTALL
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.addr INIT
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.addr DONE
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.addr GETERROR
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.addr CONTROL
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.addr CLEAR
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.addr SETVIEWPAGE
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.addr SETDRAWPAGE
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.addr SETCOLOR
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.addr SETPALETTE
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.addr GETPALETTE
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.addr GETDEFPALETTE
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.addr SETPIXEL
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.addr GETPIXEL
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.addr LINE
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.addr BAR
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.addr CIRCLE
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.addr TEXTSTYLE
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.addr OUTTEXT
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.addr 0 ; IRQ entry is unused
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; ------------------------------------------------------------------------
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.bss
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; Absolute variables used in the code
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ERROR: .res 1 ; Error code
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.ifdef __APPLE2ENH__
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Set80: .res 1 ; Set 80 column store
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.endif
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; Circle stuff
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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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; ------------------------------------------------------------------------
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.rodata
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; Constants and tables
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DEFPALETTE: .byte $00, $01, $02, $03, $04, $05, $06, $07
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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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; ------------------------------------------------------------------------
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.code
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; INIT: Changes an already installed device from text mode to graphics 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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; Must set an error code: YES
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INIT:
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.ifdef __APPLE2ENH__
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; Save and clear 80 column store
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lda RD80COL
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sta Set80
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sta CLR80COL
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.endif
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; Switch into graphics mode
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bit HIRES
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bit MIXCLR
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bit TXTCLR
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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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; Fall through
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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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; Must set an error code: NO
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INSTALL:
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; Fall through
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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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; Must set an error code: NO
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UNINSTALL:
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rts
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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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; Must set an error code: NO
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DONE:
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; Switch into text mode
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bit TXTSET
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bit LOWSCR
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.ifdef __APPLE2ENH__
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; Restore 80 column store
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lda Set80
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bpl :+
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sta SET80COL
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: bit LORES ; Limit SET80COL-HISCR to text
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.endif
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rts
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; GETERROR: Return the error code in A and clear it.
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GETERROR:
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lda ERROR
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ldx #TGI_ERR_OK
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stx ERROR
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rts
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; CLEAR: Clears the screen.
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; Must set an error code: NO
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CLEAR:
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bit $C082 ; Switch in ROM
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jsr HCLR
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bit $C080 ; Switch in LC bank 2 for R/O
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rts
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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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; Must set an error code: NO (will only be called if page ok)
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SETVIEWPAGE:
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tax
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.assert LOWSCR + 1 = HISCR, error
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lda LOWSCR,x ; No BIT absolute,X available
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rts
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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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; Must set an error code: NO (will only be called if page ok)
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SETDRAWPAGE:
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tax
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beq :+
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lda #>$4000 ; Page 2
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.byte $2C ; BIT absolute
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: lda #>$2000 ; Page 1
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sta PAGE
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rts
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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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; Must set an error code: NO (will only be called if color ok)
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SETCOLOR:
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bit $C082 ; Switch in ROM
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tax
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jsr SETHCOL
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bit $C080 ; Switch in LC bank 2 for R/O
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rts
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; CONTROL: Platform/driver specific entry point.
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; Must set an error code: YES
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CONTROL:
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; Fall through
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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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; Must set an error code: YES
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||
SETPALETTE:
|
||
lda #TGI_ERR_INV_FUNC
|
||
sta ERROR
|
||
rts
|
||
|
||
; GETPALETTE: Return the current palette in A/X. Even drivers that cannot
|
||
; set the palette should return the default palette here, so there's no
|
||
; way for this function to fail.
|
||
; Must set an error code: NO
|
||
GETPALETTE:
|
||
; Fall through
|
||
|
||
; GETDEFPALETTE: Return the default palette for the driver in A/X. All
|
||
; drivers should return something reasonable here, even drivers that don't
|
||
; support palettes, otherwise the caller has no way to determine the colors
|
||
; of the (not changeable) palette.
|
||
; Must set an error code: NO (all drivers must have a default palette)
|
||
GETDEFPALETTE:
|
||
lda #<DEFPALETTE
|
||
ldx #>DEFPALETTE
|
||
rts
|
||
|
||
; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
|
||
; color. The coordinates passed to this function are never outside the
|
||
; visible screen area, so there is no need for clipping inside this function.
|
||
; Must set an error code: NO
|
||
SETPIXEL:
|
||
bit $C082 ; Switch in ROM
|
||
ldx X1
|
||
ldy X1+1
|
||
lda Y1
|
||
jsr HPLOT
|
||
bit $C080 ; Switch in LC bank 2 for R/O
|
||
rts
|
||
|
||
SETPIXELCLIP:
|
||
lda Y1+1
|
||
bmi :+ ; y < 0
|
||
lda X1+1
|
||
bmi :+ ; x < 0
|
||
lda X1
|
||
ldx X1+1
|
||
sta ADDR
|
||
stx ADDR+1
|
||
ldx #ADDR
|
||
lda xres
|
||
ldy xres+1
|
||
jsr icmp ; ( x < xres ) ...
|
||
bcs :+
|
||
lda Y1
|
||
ldx Y1+1
|
||
sta ADDR
|
||
stx ADDR+1
|
||
ldx #ADDR
|
||
lda yres
|
||
ldy yres+1
|
||
jsr icmp ; ... && ( y < yres )
|
||
bcc SETPIXEL
|
||
: rts
|
||
|
||
; 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:
|
||
bit $C082 ; Switch in ROM
|
||
ldx X1
|
||
ldy X1+1
|
||
lda Y1
|
||
jsr HPOSN
|
||
lda (HBASL),y
|
||
and HMASK
|
||
asl
|
||
beq :+ ; 0 (black)
|
||
lda #$03 ; 3 (white)
|
||
: bcc :+
|
||
adc #$03 ; += 4 (black -> black2, white -> white2)
|
||
: ldx #$00
|
||
bit $C080 ; Switch in LC bank 2 for R/O
|
||
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:
|
||
bit $C082 ; Switch in ROM
|
||
ldx X1
|
||
ldy X1+1
|
||
lda Y1
|
||
jsr HPOSN
|
||
lda X2
|
||
ldx X2+1
|
||
ldy Y2
|
||
jsr HLIN
|
||
bit $C080 ; Switch in LC bank 2 for R/O
|
||
rts
|
||
|
||
; 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
|
||
: lda Y2
|
||
pha
|
||
lda Y1
|
||
sta Y2
|
||
jsr LINE
|
||
pla
|
||
sta Y2
|
||
inc Y1
|
||
cmp Y1
|
||
bne :-
|
||
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 :+
|
||
jmp SETPIXELCLIP ; Plot as a point
|
||
: sta XX
|
||
|
||
; x = r
|
||
lda #$00
|
||
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) {
|
||
while: ldx #YY
|
||
lda XX
|
||
ldy XX+1
|
||
jsr icmp
|
||
bcc :+
|
||
rts
|
||
|
||
; 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 #$01
|
||
bcc :+
|
||
inx
|
||
: 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 #$01
|
||
bcc :+
|
||
inx
|
||
: sta OUkos
|
||
stx OUkos+1
|
||
|
||
; ++y
|
||
inc YY
|
||
bne :+
|
||
inc YY+1
|
||
|
||
; 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 :++
|
||
|
||
; --x
|
||
lda XX
|
||
sub #$01
|
||
sta XX
|
||
bcs :+
|
||
dec XX+1
|
||
|
||
; mo = ou }
|
||
: lda OUkos
|
||
ldx OUkos+1
|
||
jmp :++
|
||
|
||
; else mo = og
|
||
: lda OGora
|
||
ldx OGora+1
|
||
: sta MaxO
|
||
stx MaxO+1
|
||
|
||
; }
|
||
jmp while
|
||
|
||
; 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 SCALE
|
||
asl ; 16 <=> 90<39>
|
||
asl
|
||
asl
|
||
asl
|
||
sta ROT
|
||
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:
|
||
bit $C082 ; Switch in ROM
|
||
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 #$00
|
||
: lda (ptr3),y
|
||
beq :+
|
||
sub #$1F ; 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 ROT
|
||
jsr DRAW
|
||
ldx tmp3
|
||
ldy tmp3+1
|
||
lda ROT
|
||
jsr DRAW
|
||
pla
|
||
tay
|
||
iny
|
||
bne :-
|
||
: bit $C080 ; Switch in LC bank 2 for R/O
|
||
rts
|
||
|
||
; Copies of some runtime routines
|
||
|
||
abs:
|
||
; A/Y := abs (A/Y)
|
||
cpy #$00
|
||
bpl :+
|
||
clc
|
||
eor #$FF
|
||
adc #$01
|
||
pha
|
||
tya
|
||
eor #$FF
|
||
adc #$00
|
||
tay
|
||
pla
|
||
: rts
|
||
|
||
icmp:
|
||
; Compare A/Y to zp,X
|
||
sta TEMP ; TEMP/TEMP2 - arg2
|
||
sty TEMP2
|
||
lda $00,x
|
||
pha
|
||
lda $01,x
|
||
tay
|
||
pla
|
||
tax
|
||
tya ; X/A - arg1 (a = high)
|
||
|
||
sub TEMP2
|
||
bne :++
|
||
cpx TEMP
|
||
beq :+
|
||
adc #$FF
|
||
ora #$01
|
||
: rts
|
||
: bvc :+
|
||
eor #$FF
|
||
ora #$01
|
||
: rts
|