2 ; Graphics driver for the 280x192x6 mode on the Apple II
4 ; Stefan Haubenthal <polluks@sdf.lonestar.org>
5 ; Based on Maciej Witkowiak's circle routine
8 .include "zeropage.inc"
10 .include "tgi-kernel.inc"
11 .include "tgi-mode.inc"
12 .include "tgi-error.inc"
17 ; ------------------------------------------------------------------------
18 ; Header. Includes jump table and constants.
22 ; First part of the header is a structure that has a magic and defines the
23 ; capabilities of the driver
25 .byte $74, $67, $69 ; "tgi"
26 .byte TGI_API_VERSION ; TGI API version number
27 xres: .word 280 ; X resolution
28 yres: .word 192 ; Y resolution
29 .byte 8 ; Number of drawing colors
30 .byte 2 ; Number of screens available
31 .byte 8 ; System font X size
32 .byte 8 ; System font Y size
33 .res 4, $00 ; Reserved for future extensions
35 ; Next comes the jump table. Currently all entries must be valid and may point
36 ; to an RTS for test versions (function not implemented).
59 ; ------------------------------------------------------------------------
62 ; Variables mapped to the zero page segment variables. Some of these are
63 ; used for passing parameters to the driver.
78 XX = ptr3 ; (2) CIRCLE
79 YY = ptr4 ; (2) CIRCLE
80 MaxO = sreg ; (overwritten by TEMP3+TEMP4, but restored from OG/OU anyway)
81 XS = regsave ; (2) CIRCLE
82 YS = regsave+2 ; (2) CIRCLE
84 ; Absolute variables used in the code
88 ERROR: .res 1 ; Error code
90 ; Line routine stuff (combined with CIRCLE to save space)
101 ; Constants and tables
105 DEFPALETTE: .byte $00, $05, $04, $01, $00, $08, $06, $01; 6 unique colors
107 SHAPE: .byte $64,$01,$d0,$00,$d5,$00,$da,$00,$e0,$00,$ef,$00,$fe,$00,$0c,$01
108 .byte $19,$01,$1d,$01,$25,$01,$2d,$01,$3d,$01,$46,$01,$4b,$01,$52,$01
109 .byte $56,$01,$60,$01,$70,$01,$77,$01,$83,$01,$8e,$01,$9a,$01,$a7,$01
110 .byte $b6,$01,$bf,$01,$ce,$01,$dd,$01,$e2,$01,$e7,$01,$f9,$01,$03,$02
111 .byte $15,$02,$1f,$02,$32,$02,$42,$02,$52,$02,$5e,$02,$6c,$02,$79,$02
112 .byte $85,$02,$91,$02,$a1,$02,$a9,$02,$b2,$02,$bf,$02,$c5,$02,$d5,$02
113 .byte $e5,$02,$f4,$02,$00,$03,$10,$03,$1f,$03,$2d,$03,$35,$03,$44,$03
114 .byte $53,$03,$63,$03,$71,$03,$7b,$03,$85,$03,$91,$03,$97,$03,$a3,$03
115 .byte $b6,$03,$bf,$03,$c3,$03,$cf,$03,$dc,$03,$e4,$03,$f3,$03,$00,$04
116 .byte $0a,$04,$19,$04,$25,$04,$2a,$04,$32,$04,$3c,$04,$43,$04,$50,$04
117 .byte $5a,$04,$66,$04,$72,$04,$7e,$04,$87,$04,$94,$04,$9c,$04,$a8,$04
118 .byte $b4,$04,$c1,$04,$cc,$04,$db,$04,$e6,$04,$ee,$04,$f3,$04,$fb,$04
119 .byte $04,$05,$1a,$05,$1f,$05,$24,$05,$29,$05,$22,$01,$00,$00,$00,$00
120 .byte $09,$89,$92,$92,$00,$36,$36,$16,$0e,$00,$0d,$fe,$6e,$96,$52,$00
121 .byte $69,$fe,$17,$2d,$2d,$1e,$1f,$17,$2d,$2d,$1e,$1f,$6e,$4e,$00,$09
122 .byte $8d,$3f,$bf,$0d,$15,$3f,$0e,$0d,$1e,$3f,$77,$71,$09,$00,$6d,$11
123 .byte $df,$77,$09,$1e,$17,$4d,$3a,$df,$4e,$29,$0e,$00,$a9,$1f,$6e,$1e
124 .byte $17,$0d,$0d,$1e,$df,$0e,$6d,$0e,$00,$36,$96,$52,$00,$09,$1e,$17
125 .byte $36,$15,$0e,$0e,$00,$15,$0e,$36,$1e,$17,$4e,$01,$00,$09,$8d,$1f
126 .byte $1f,$0e,$2d,$1e,$17,$2d,$15,$1f,$1f,$4e,$4e,$01,$00,$89,$6e,$3a
127 .byte $3f,$77,$31,$56,$09,$00,$92,$8a,$f6,$0d,$00,$52,$89,$3f,$b7,$52
128 .byte $49,$00,$92,$92,$0e,$00,$49,$11,$17,$1e,$17,$1e,$56,$49,$01,$00
129 .byte $29,$ad,$df,$33,$4d,$35,$1f,$1f,$2e,$4d,$fe,$1b,$0e,$2d,$4e,$00
130 .byte $31,$77,$36,$be,$2d,$0e,$00,$29,$ad,$df,$73,$49,$1e,$bf,$1e,$2e
131 .byte $2d,$75,$00,$2d,$2d,$be,$3e,$4e,$fe,$1b,$0e,$2d,$4e,$00,$49,$3e
132 .byte $17,$0d,$fe,$33,$2d,$2d,$1e,$76,$01,$00,$2d,$2d,$de,$1b,$2e,$2d
133 .byte $15,$36,$df,$73,$2d,$4e,$00,$09,$2d,$de,$bb,$4d,$3a,$3f,$6e,$09
134 .byte $fe,$1b,$0e,$2d,$4e,$00,$2d,$2d,$be,$1e,$17,$36,$4e,$09,$00,$29
135 .byte $ad,$df,$33,$4d,$f1,$3f,$17,$4d,$31,$df,$73,$2d,$4e,$00,$29,$ad
136 .byte $df,$33,$4d,$31,$3f,$77,$09,$1e,$df,$2a,$75,$09,$00,$12,$16,$96
137 .byte $01,$00,$52,$b2,$f6,$0d,$00,$49,$3e,$17,$2d,$2d,$35,$3f,$3f,$3f
138 .byte $0e,$2d,$2d,$f5,$1b,$77,$4e,$09,$00,$12,$2d,$2d,$de,$9b,$2d,$2d
139 .byte $96,$01,$00,$49,$15,$ff,$13,$2d,$2d,$ad,$3f,$3f,$3f,$2e,$2d,$2d
140 .byte $1e,$37,$4e,$09,$00,$29,$ad,$df,$73,$09,$1e,$b6,$4e,$01,$00,$09
141 .byte $2d,$3e,$37,$2d,$3e,$ff,$2a,$2d,$2d,$f5,$3f,$3f,$0e,$2d,$1e,$4d
142 .byte $01,$00,$09,$15,$1f,$17,$4d,$31,$df,$33,$2d,$2d,$fe,$1b,$6e,$09
143 .byte $0e,$00,$2d,$ad,$df,$33,$4d,$f1,$3f,$37,$4d,$31,$df,$33,$2d,$75
144 .byte $01,$00,$29,$ad,$df,$33,$36,$4d,$11,$df,$73,$2d,$4e,$00,$2d,$ad
145 .byte $df,$6e,$31,$df,$6e,$31,$df,$17,$2d,$75,$01,$00,$2d,$2d,$de,$1b
146 .byte $6e,$11,$3f,$37,$36,$2d,$2d,$0e,$00,$2d,$2d,$de,$1b,$6e,$11,$3f
147 .byte $37,$36,$4e,$49,$00,$29,$ad,$df,$33,$36,$4d,$35,$df,$73,$2d,$75
148 .byte $00,$4d,$31,$df,$33,$4d,$31,$3f,$3f,$6e,$09,$fe,$1b,$6e,$09,$0e
149 .byte $00,$2d,$1e,$36,$36,$17,$2d,$0e,$00,$49,$31,$36,$36,$df,$73,$2d
150 .byte $4e,$00,$4d,$f1,$df,$6e,$1e,$37,$0d,$15,$df,$6e,$09,$0e,$00,$36
151 .byte $36,$36,$2d,$75,$00,$4d,$31,$ff,$37,$0d,$0d,$fe,$1f,$6e,$09,$fe
152 .byte $1b,$6e,$09,$0e,$00,$4d,$31,$df,$33,$6d,$31,$1f,$1f,$6e,$29,$fe
153 .byte $1b,$6e,$09,$0e,$00,$29,$ad,$df,$33,$4d,$31,$df,$33,$4d,$31,$df
154 .byte $73,$2d,$4e,$00,$2d,$ad,$df,$33,$4d,$f1,$3f,$37,$36,$4e,$49,$00
155 .byte $29,$ad,$df,$33,$4d,$31,$df,$33,$0d,$0d,$1e,$df,$0e,$6d,$0e,$00
156 .byte $2d,$ad,$df,$33,$4d,$f1,$3f,$37,$0d,$15,$df,$6e,$09,$0e,$00,$29
157 .byte $ad,$df,$33,$4d,$3a,$77,$09,$fe,$1b,$0e,$2d,$4e,$00,$2d,$2d,$de
158 .byte $36,$36,$76,$09,$00,$4d,$31,$df,$33,$4d,$31,$df,$33,$4d,$31,$df
159 .byte $73,$2d,$4e,$00,$4d,$31,$df,$33,$4d,$31,$df,$33,$4d,$f1,$1f,$0e
160 .byte $4e,$01,$00,$4d,$31,$df,$33,$4d,$31,$1f,$1f,$6e,$0d,$3e,$1f,$37
161 .byte $4d,$71,$00,$4d,$31,$df,$73,$0d,$1e,$17,$0d,$15,$df,$33,$4d,$71
162 .byte $00,$4d,$31,$df,$73,$0d,$1e,$36,$76,$09,$00,$2d,$2d,$be,$1e,$17
163 .byte $1e,$2e,$2d,$75,$00,$2d,$2d,$de,$3b,$2e,$3e,$2e,$3e,$2e,$2d,$75
164 .byte $00,$72,$15,$0e,$15,$56,$00,$2d,$2d,$3e,$2e,$3e,$2e,$3e,$df,$2a
165 .byte $2d,$75,$00,$49,$15,$3f,$17,$2d,$2d,$15,$3f,$3f,$3f,$4e,$2d,$3e
166 .byte $37,$2d,$3e,$6f,$49,$00,$92,$92,$49,$11,$3f,$3f,$4d,$09,$00,$76
167 .byte $96,$52,$00,$52,$2d,$35,$df,$33,$4d,$31,$ff,$73,$6d,$0e,$00,$36
168 .byte $2d,$ad,$df,$33,$4d,$31,$df,$33,$2d,$75,$01,$00,$52,$2d,$de,$33
169 .byte $76,$2d,$0e,$00,$49,$31,$df,$2a,$2d,$fe,$1b,$6e,$09,$fe,$1b,$0e
170 .byte $2d,$75,$00,$52,$2d,$15,$df,$33,$2d,$2d,$de,$1b,$0e,$2d,$75,$00
171 .byte $09,$f5,$33,$8d,$3f,$77,$36,$4e,$01,$00,$52,$2d,$35,$df,$33,$4d
172 .byte $31,$3f,$77,$09,$1e,$3f,$4d,$01,$00,$36,$2d,$ad,$df,$33,$4d,$31
173 .byte $df,$33,$4d,$71,$00,$16,$36,$36,$0e,$00,$09,$9e,$35,$36,$f6,$6f
174 .byte $01,$00,$36,$4d,$1e,$1f,$2e,$15,$1f,$6e,$71,$00,$35,$36,$36,$17
175 .byte $2d,$0e,$00,$12,$2d,$ad,$1f,$1f,$6e,$0d,$fe,$1f,$6e,$0d,$0e,$00
176 .byte $12,$2d,$15,$df,$6e,$31,$df,$6e,$71,$00,$52,$2d,$15,$df,$33,$4d
177 .byte $31,$df,$73,$2d,$4e,$00,$12,$2d,$ad,$df,$33,$4d,$f1,$3f,$37,$6e
178 .byte $49,$00,$52,$2d,$35,$df,$33,$4d,$31,$3f,$77,$09,$2e,$00,$12,$0d
179 .byte $ad,$df,$37,$36,$4e,$49,$00,$52,$2d,$f5,$db,$0e,$2d,$15,$df,$13
180 .byte $2d,$75,$01,$00,$31,$17,$2d,$f5,$33,$76,$75,$00,$12,$4d,$31,$df
181 .byte $33,$4d,$31,$ff,$73,$6d,$0e,$00,$12,$4d,$31,$df,$33,$4d,$f1,$1f
182 .byte $0e,$4e,$01,$00,$12,$4d,$31,$df,$33,$0d,$0d,$fe,$1f,$0e,$0d,$4e
183 .byte $00,$12,$4d,$f1,$1f,$0e,$15,$1f,$17,$4d,$71,$00,$12,$4d,$31,$df
184 .byte $33,$4d,$31,$3f,$77,$09,$1e,$3f,$4d,$01,$00,$12,$2d,$2d,$1e,$17
185 .byte $1e,$17,$2d,$2d,$0e,$00,$09,$f5,$33,$1e,$0e,$76,$75,$00,$36,$36
186 .byte $36,$2e,$00,$ad,$ae,$17,$fe,$2a,$4e,$01,$00,$69,$11,$1f,$1f,$4e
187 .byte $b1,$92,$09,$00,$2d,$2d,$35,$3f,$3f,$37,$2d,$2d,$35,$3f,$3f,$37
188 .byte $2d,$2d,$35,$3f,$3f,$37,$2d,$2d,$75,$00,$40,$c0,$40,$18,$00,$40
189 .byte $c0,$40,$43,$00,$40,$c0,$40,$08,$00,$19,$00,$00
193 ; ------------------------------------------------------------------------
194 ; INSTALL routine. Is called after the driver is loaded into memory. May
195 ; initialize anything that has to be done just once. Is probably empty
198 ; Must set an error code: NO
204 ; ------------------------------------------------------------------------
205 ; UNINSTALL routine. Is called before the driver is removed from memory. May
206 ; clean up anything done by INSTALL but is probably empty most of the time.
208 ; Must set an error code: NO
215 ; ------------------------------------------------------------------------
216 ; INIT: Changes an already installed device from text mode to graphics
218 ; Note that INIT/DONE may be called multiple times while the driver
219 ; is loaded, while INSTALL is only called once, so any code that is needed
220 ; to initializes variables and so on must go here. Setting palette and
221 ; clearing the screen is not needed because this is called by the graphics
223 ; The graphics kernel will never call INIT when a graphics mode is already
224 ; active, so there is no need to protect against that.
226 ; Must set an error code: YES
231 ; Switch into graphics mode
236 ; Done, reset the error code
242 ; ------------------------------------------------------------------------
243 ; DONE: Will be called to switch the graphics device back into text mode.
244 ; The graphics kernel will never call DONE when no graphics mode is active,
245 ; so there is no need to protect against that.
247 ; Must set an error code: NO
252 ; ------------------------------------------------------------------------
253 ; GETERROR: Return the error code in A and clear it.
261 ; ------------------------------------------------------------------------
262 ; CONTROL: Platform/driver specific entry point.
264 ; Must set an error code: YES
268 lda #TGI_ERR_INV_FUNC
272 ; ------------------------------------------------------------------------
273 ; CLEAR: Clears the screen.
275 ; Must set an error code: NO
280 ; ------------------------------------------------------------------------
281 ; SETVIEWPAGE: Set the visible page. Called with the new page in A (0..n).
282 ; The page number is already checked to be valid by the graphics kernel.
284 ; Must set an error code: NO (will only be called if page ok)
295 ; ------------------------------------------------------------------------
296 ; SETDRAWPAGE: Set the drawable page. Called with the new page in A (0..n).
297 ; The page number is already checked to be valid by the graphics kernel.
299 ; Must set an error code: NO (will only be called if page ok)
307 @L1: lda #>$2000 ; Page 1
311 ; ------------------------------------------------------------------------
312 ; SETCOLOR: Set the drawing color (in A). The new color is already checked
313 ; to be in a valid range (0..maxcolor-1).
315 ; Must set an error code: NO (will only be called if color ok)
322 ; ------------------------------------------------------------------------
323 ; SETPALETTE: Set the palette (not available with all drivers/hardware).
324 ; A pointer to the palette is passed in ptr1. Must set an error if palettes
327 ; Must set an error code: YES
331 lda #TGI_ERR_INV_FUNC
335 ; ------------------------------------------------------------------------
336 ; GETPALETTE: Return the current palette in A/X. Even drivers that cannot
337 ; set the palette should return the default palette here, so there's no
338 ; way for this function to fail.
340 ; Must set an error code: NO
345 ; ------------------------------------------------------------------------
346 ; GETDEFPALETTE: Return the default palette for the driver in A/X. All
347 ; drivers should return something reasonable here, even drivers that don't
348 ; support palettes, otherwise the caller has no way to determine the colors
349 ; of the (not changeable) palette.
351 ; Must set an error code: NO (all drivers must have a default palette)
359 ; ------------------------------------------------------------------------
360 ; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
361 ; color. The coordinates passed to this function are never outside the
362 ; visible screen area, so there is no need for clipping inside this function.
364 ; Must set an error code: NO
379 jsr icmp ; ( x < xres ) ...
388 jsr icmp ; ... && ( y < yres )
398 ; ------------------------------------------------------------------------
399 ; GETPIXEL: Read the color value of a pixel and return it in A/X. The
400 ; coordinates passed to this function are never outside the visible screen
401 ; area, so there is no need for clipping inside this function.
408 jsr HPOSN ; 1st pixel
418 lda $E0 ; which neighbour
429 jsr HPOSN ; 2nd pixel
440 ; ------------------------------------------------------------------------
441 ; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and
442 ; X2/Y2 = ptr3/ptr4 using the current drawing color.
444 ; Must set an error code: NO
457 ; ------------------------------------------------------------------------
458 ; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
459 ; X1/Y1 = ptr1/ptr2 and X2/Y2 = ptr3/ptr4 using the current drawing color.
460 ; Contrary to most other functions, the graphics kernel will sort and clip
461 ; the coordinates before calling the driver, so on entry the following
462 ; conditions are valid:
465 ; (X1 >= 0) && (X1 < XRES)
466 ; (X2 >= 0) && (X2 < XRES)
467 ; (Y1 >= 0) && (Y1 < YRES)
468 ; (Y2 >= 0) && (Y2 < YRES)
470 ; Must set an error code: NO
487 ; ------------------------------------------------------------------------
488 ; CIRCLE: Draw a circle around the center X1/Y1 (= ptr1/ptr2) with the
489 ; radius in tmp1 and the current drawing color.
491 ; Must set an error code: NO
497 jmp SETPIXELCLIP ; Plot as a point
515 stx YS+1 ; XS/YS to remember the center
524 @L12: ; plot points in 8 slices...
537 sta Y1+1 ; (stack)=ys+y, y1=(stack)
539 jsr SETPIXELCLIP ; plot(xs+x,ys+y)
546 sta Y1+1 ; y3 = y1 = ys-y
548 jsr SETPIXELCLIP ; plot(xs+x,ys-y)
559 jsr SETPIXELCLIP ; plot (xs-x,ys+y)
564 jsr SETPIXELCLIP ; plot (xs-x,ys-y)
578 sta Y1+1 ; (stack)=ys+x, y1=(stack)
580 jsr SETPIXELCLIP ; plot(xs+y,ys+x)
587 sta Y1+1 ; y3 = y1 = ys-x
589 jsr SETPIXELCLIP ; plot(xs+y,ys-x)
593 sta Y1 ; y1 = ys+x(stack)
600 jsr SETPIXELCLIP ; plot (xs-y,ys+x)
605 jsr SETPIXELCLIP ; plot (xs-y,ys-x)
649 @L0148: ; if (abs(ou)<abs(og))
679 ; ------------------------------------------------------------------------
680 ; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in X and Y
681 ; direction is passend in X/Y, the text direction is passed in A.
683 ; Must set an error code: NO
697 ; ------------------------------------------------------------------------
698 ; OUTTEXT: Output text at X/Y = ptr1/ptr2 using the current color and the
699 ; current text style. The text to output is given as a zero terminated
700 ; string with address in ptr3.
702 ; Must set an error code: NO
720 sub #31 ; no controls
746 ; copies of some runtime routines
765 ; compare a/y to zp,x
766 sta TEMP ; TEMP/TEMP2 - arg2
774 tya ; x/a - arg1 (a=high)