2 ; Graphics driver for the 280x192x8 mode on the Apple II
4 ; Stefan Haubenthal <polluks@sdf.lonestar.org>
5 ; Oliver Schmidt <ol.sc@web.de>
6 ; Based on Maciej Witkowiak's circle routine
9 .include "zeropage.inc"
11 .include "tgi-kernel.inc"
12 .include "tgi-mode.inc"
13 .include "tgi-error.inc"
18 ; ------------------------------------------------------------------------
28 ; Graphics entry points, by cbmnut (applenut??) cbmnut@hushmail.com
30 TEXT := $F399 ; Return to text screen
31 HGR2 := $F3D8 ; Initialize and clear hi-res page 2.
32 HGR := $F3E2 ; Initialize and clear hi-res page 1.
33 HCLR := $F3F2 ; Clear the current hi-res screen to black.
34 BKGND := $F3F6 ; Clear the current hi-res screen to the
35 ; last plotted color (from ($1C).
36 HPOSN := $F411 ; Positions the hi-res cursor without
38 ; Enter with (A) = Y-coordinate, and
39 ; (Y,X) = X-coordinate.
40 HPLOT := $F457 ; Calls HPOSN and tries to plot a dot at
41 ; the cursor's position. If you are
42 ; trying to plot a non-white color at
43 ; a complementary color position, no
44 ; dot will be plotted.
45 HLIN := $F53A ; Draws a line from the last plotted
46 ; point or line destination to:
47 ; (X,A) = X-coordinate, and
49 HFIND := $F5CB ; Converts the hi-res coursor's position
50 ; back to X- and Y-coordinates; stores
51 ; X-coordinate at $E0,E1 and Y-coordinate
53 DRAW := $F601 ; Draws a shape. Enter with (Y,X) = the
54 ; address of the shape table, and (A) =
55 ; the rotation factor. Uses the current
57 XDRAW := $F65D ; Draws a shape by inverting the existing
58 ; color of the dots the shape draws over.
59 ; Same entry parameters as DRAW.
60 SETHCOL := $F6EC ; Set the hi-res color to (X), where (X)
61 ; must be between 0 and 7.
63 ; ------------------------------------------------------------------------
65 ; Variables mapped to the zero page segment variables. Some of these are
66 ; used for passing parameters to the driver.
74 ADDR := tmp1 ; (2) SETPIXELCLIP
77 XX := ptr3 ; (2) CIRCLE
78 YY := ptr4 ; (2) CIRCLE
79 TEMP3 := sreg ; CIRCLE
80 TEMP4 := sreg+1 ; CIRCLE
81 MaxO := sreg ; (overwritten by TEMP3+TEMP4, but restored from OG/OU anyway)
82 XS := regsave ; (2) CIRCLE
83 YS := regsave+2 ; (2) CIRCLE
85 ; ------------------------------------------------------------------------
89 ; Header. Includes jump table and constants.
91 ; First part of the header is a structure that has a magic and defines the
92 ; capabilities of the driver
94 .byte $74, $67, $69 ; "tgi"
95 .byte TGI_API_VERSION ; TGI API version number
96 xres: .word 280 ; X resolution
97 yres: .word 192 ; Y resolution
98 .byte 8 ; Number of drawing colors
99 .byte 2 ; Number of screens available
100 .byte 8 ; System font X size
101 .byte 8 ; System font Y size
102 .res 4, $00 ; Reserved for future extensions
104 ; Next comes the jump table. Currently all entries must be valid and may point
105 ; to an RTS for test versions (function not implemented).
127 .addr 0 ; IRQ entry is unused
129 ; ------------------------------------------------------------------------
133 ; Absolute variables used in the code
135 ERROR: .res 1 ; Error code
138 Set80: .res 1 ; Set 80 column store
147 ; ------------------------------------------------------------------------
151 ; Constants and tables
153 DEFPALETTE: .byte $00, $01, $02, $03, $04, $05, $06, $07
155 SHAPE: .byte $64,$01,$D0,$00,$D5,$00,$DA,$00,$E0,$00,$EF,$00,$FE,$00,$0C,$01
156 .byte $19,$01,$1D,$01,$25,$01,$2D,$01,$3D,$01,$46,$01,$4B,$01,$52,$01
157 .byte $56,$01,$60,$01,$70,$01,$77,$01,$83,$01,$8E,$01,$9A,$01,$A7,$01
158 .byte $B6,$01,$BF,$01,$CE,$01,$DD,$01,$E2,$01,$E7,$01,$F9,$01,$03,$02
159 .byte $15,$02,$1F,$02,$32,$02,$42,$02,$52,$02,$5E,$02,$6C,$02,$79,$02
160 .byte $85,$02,$91,$02,$A1,$02,$A9,$02,$B2,$02,$BF,$02,$C5,$02,$D5,$02
161 .byte $E5,$02,$F4,$02,$00,$03,$10,$03,$1F,$03,$2D,$03,$35,$03,$44,$03
162 .byte $53,$03,$63,$03,$71,$03,$7B,$03,$85,$03,$91,$03,$97,$03,$A3,$03
163 .byte $B6,$03,$BF,$03,$C3,$03,$CF,$03,$DC,$03,$E4,$03,$F3,$03,$00,$04
164 .byte $0A,$04,$19,$04,$25,$04,$2A,$04,$32,$04,$3C,$04,$43,$04,$50,$04
165 .byte $5A,$04,$66,$04,$72,$04,$7E,$04,$87,$04,$94,$04,$9C,$04,$A8,$04
166 .byte $B4,$04,$C1,$04,$CC,$04,$DB,$04,$E6,$04,$EE,$04,$F3,$04,$FB,$04
167 .byte $04,$05,$1A,$05,$1F,$05,$24,$05,$29,$05,$22,$01,$00,$00,$00,$00
168 .byte $09,$89,$92,$92,$00,$36,$36,$16,$0E,$00,$0D,$FE,$6E,$96,$52,$00
169 .byte $69,$FE,$17,$2D,$2D,$1E,$1F,$17,$2D,$2D,$1E,$1F,$6E,$4E,$00,$09
170 .byte $8D,$3F,$BF,$0D,$15,$3F,$0E,$0D,$1E,$3F,$77,$71,$09,$00,$6D,$11
171 .byte $DF,$77,$09,$1E,$17,$4D,$3A,$DF,$4E,$29,$0E,$00,$A9,$1F,$6E,$1E
172 .byte $17,$0D,$0D,$1E,$DF,$0E,$6D,$0E,$00,$36,$96,$52,$00,$09,$1E,$17
173 .byte $36,$15,$0E,$0E,$00,$15,$0E,$36,$1E,$17,$4E,$01,$00,$09,$8D,$1F
174 .byte $1F,$0E,$2D,$1E,$17,$2D,$15,$1F,$1F,$4E,$4E,$01,$00,$89,$6E,$3A
175 .byte $3F,$77,$31,$56,$09,$00,$92,$8A,$F6,$0D,$00,$52,$89,$3F,$B7,$52
176 .byte $49,$00,$92,$92,$0E,$00,$49,$11,$17,$1E,$17,$1E,$56,$49,$01,$00
177 .byte $29,$AD,$DF,$33,$4D,$35,$1F,$1F,$2E,$4D,$FE,$1B,$0E,$2D,$4E,$00
178 .byte $31,$77,$36,$BE,$2D,$0E,$00,$29,$AD,$DF,$73,$49,$1E,$BF,$1E,$2E
179 .byte $2D,$75,$00,$2D,$2D,$BE,$3E,$4E,$FE,$1B,$0E,$2D,$4E,$00,$49,$3E
180 .byte $17,$0D,$FE,$33,$2D,$2D,$1E,$76,$01,$00,$2D,$2D,$DE,$1B,$2E,$2D
181 .byte $15,$36,$DF,$73,$2D,$4E,$00,$09,$2D,$DE,$BB,$4D,$3A,$3F,$6E,$09
182 .byte $FE,$1B,$0E,$2D,$4E,$00,$2D,$2D,$BE,$1E,$17,$36,$4E,$09,$00,$29
183 .byte $AD,$DF,$33,$4D,$F1,$3F,$17,$4D,$31,$DF,$73,$2D,$4E,$00,$29,$AD
184 .byte $DF,$33,$4D,$31,$3F,$77,$09,$1E,$DF,$2A,$75,$09,$00,$12,$16,$96
185 .byte $01,$00,$52,$B2,$F6,$0D,$00,$49,$3E,$17,$2D,$2D,$35,$3F,$3F,$3F
186 .byte $0E,$2D,$2D,$F5,$1B,$77,$4E,$09,$00,$12,$2D,$2D,$DE,$9B,$2D,$2D
187 .byte $96,$01,$00,$49,$15,$FF,$13,$2D,$2D,$AD,$3F,$3F,$3F,$2E,$2D,$2D
188 .byte $1E,$37,$4E,$09,$00,$29,$AD,$DF,$73,$09,$1E,$B6,$4E,$01,$00,$09
189 .byte $2D,$3E,$37,$2D,$3E,$FF,$2A,$2D,$2D,$F5,$3F,$3F,$0E,$2D,$1E,$4D
190 .byte $01,$00,$09,$15,$1F,$17,$4D,$31,$DF,$33,$2D,$2D,$FE,$1B,$6E,$09
191 .byte $0E,$00,$2D,$AD,$DF,$33,$4D,$F1,$3F,$37,$4D,$31,$DF,$33,$2D,$75
192 .byte $01,$00,$29,$AD,$DF,$33,$36,$4D,$11,$DF,$73,$2D,$4E,$00,$2D,$AD
193 .byte $DF,$6E,$31,$DF,$6E,$31,$DF,$17,$2D,$75,$01,$00,$2D,$2D,$DE,$1B
194 .byte $6E,$11,$3F,$37,$36,$2D,$2D,$0E,$00,$2D,$2D,$DE,$1B,$6E,$11,$3F
195 .byte $37,$36,$4E,$49,$00,$29,$AD,$DF,$33,$36,$4D,$35,$DF,$73,$2D,$75
196 .byte $00,$4D,$31,$DF,$33,$4D,$31,$3F,$3F,$6E,$09,$FE,$1B,$6E,$09,$0E
197 .byte $00,$2D,$1E,$36,$36,$17,$2D,$0E,$00,$49,$31,$36,$36,$DF,$73,$2D
198 .byte $4E,$00,$4D,$F1,$DF,$6E,$1E,$37,$0D,$15,$DF,$6E,$09,$0E,$00,$36
199 .byte $36,$36,$2D,$75,$00,$4D,$31,$FF,$37,$0D,$0D,$FE,$1F,$6E,$09,$FE
200 .byte $1B,$6E,$09,$0E,$00,$4D,$31,$DF,$33,$6D,$31,$1F,$1F,$6E,$29,$FE
201 .byte $1B,$6E,$09,$0E,$00,$29,$AD,$DF,$33,$4D,$31,$DF,$33,$4D,$31,$DF
202 .byte $73,$2D,$4E,$00,$2D,$AD,$DF,$33,$4D,$F1,$3F,$37,$36,$4E,$49,$00
203 .byte $29,$AD,$DF,$33,$4D,$31,$DF,$33,$0D,$0D,$1E,$DF,$0E,$6D,$0E,$00
204 .byte $2D,$AD,$DF,$33,$4D,$F1,$3F,$37,$0D,$15,$DF,$6E,$09,$0E,$00,$29
205 .byte $AD,$DF,$33,$4D,$3A,$77,$09,$FE,$1B,$0E,$2D,$4E,$00,$2D,$2D,$DE
206 .byte $36,$36,$76,$09,$00,$4D,$31,$DF,$33,$4D,$31,$DF,$33,$4D,$31,$DF
207 .byte $73,$2D,$4E,$00,$4D,$31,$DF,$33,$4D,$31,$DF,$33,$4D,$F1,$1F,$0E
208 .byte $4E,$01,$00,$4D,$31,$DF,$33,$4D,$31,$1F,$1F,$6E,$0D,$3E,$1F,$37
209 .byte $4D,$71,$00,$4D,$31,$DF,$73,$0D,$1E,$17,$0D,$15,$DF,$33,$4D,$71
210 .byte $00,$4D,$31,$DF,$73,$0D,$1E,$36,$76,$09,$00,$2D,$2D,$BE,$1E,$17
211 .byte $1E,$2E,$2D,$75,$00,$2D,$2D,$DE,$3B,$2E,$3E,$2E,$3E,$2E,$2D,$75
212 .byte $00,$72,$15,$0E,$15,$56,$00,$2D,$2D,$3E,$2E,$3E,$2E,$3E,$DF,$2A
213 .byte $2D,$75,$00,$49,$15,$3F,$17,$2D,$2D,$15,$3F,$3F,$3F,$4E,$2D,$3E
214 .byte $37,$2D,$3E,$6F,$49,$00,$92,$92,$49,$11,$3F,$3F,$4D,$09,$00,$76
215 .byte $96,$52,$00,$52,$2D,$35,$DF,$33,$4D,$31,$FF,$73,$6D,$0E,$00,$36
216 .byte $2D,$AD,$DF,$33,$4D,$31,$DF,$33,$2D,$75,$01,$00,$52,$2D,$DE,$33
217 .byte $76,$2D,$0E,$00,$49,$31,$DF,$2A,$2D,$FE,$1B,$6E,$09,$FE,$1B,$0E
218 .byte $2D,$75,$00,$52,$2D,$15,$DF,$33,$2D,$2D,$DE,$1B,$0E,$2D,$75,$00
219 .byte $09,$F5,$33,$8D,$3F,$77,$36,$4E,$01,$00,$52,$2D,$35,$DF,$33,$4D
220 .byte $31,$3F,$77,$09,$1E,$3F,$4D,$01,$00,$36,$2D,$AD,$DF,$33,$4D,$31
221 .byte $DF,$33,$4D,$71,$00,$16,$36,$36,$0E,$00,$09,$9E,$35,$36,$F6,$6F
222 .byte $01,$00,$36,$4D,$1E,$1F,$2E,$15,$1F,$6E,$71,$00,$35,$36,$36,$17
223 .byte $2D,$0E,$00,$12,$2D,$AD,$1F,$1F,$6E,$0D,$FE,$1F,$6E,$0D,$0E,$00
224 .byte $12,$2D,$15,$DF,$6E,$31,$DF,$6E,$71,$00,$52,$2D,$15,$DF,$33,$4D
225 .byte $31,$DF,$73,$2D,$4E,$00,$12,$2D,$AD,$DF,$33,$4D,$F1,$3F,$37,$6E
226 .byte $49,$00,$52,$2D,$35,$DF,$33,$4D,$31,$3F,$77,$09,$2E,$00,$12,$0D
227 .byte $AD,$DF,$37,$36,$4E,$49,$00,$52,$2D,$F5,$DB,$0E,$2D,$15,$DF,$13
228 .byte $2D,$75,$01,$00,$31,$17,$2D,$F5,$33,$76,$75,$00,$12,$4D,$31,$DF
229 .byte $33,$4D,$31,$FF,$73,$6D,$0E,$00,$12,$4D,$31,$DF,$33,$4D,$F1,$1F
230 .byte $0E,$4E,$01,$00,$12,$4D,$31,$DF,$33,$0D,$0D,$FE,$1F,$0E,$0D,$4E
231 .byte $00,$12,$4D,$F1,$1F,$0E,$15,$1F,$17,$4D,$71,$00,$12,$4D,$31,$DF
232 .byte $33,$4D,$31,$3F,$77,$09,$1E,$3F,$4D,$01,$00,$12,$2D,$2D,$1E,$17
233 .byte $1E,$17,$2D,$2D,$0E,$00,$09,$F5,$33,$1E,$0E,$76,$75,$00,$36,$36
234 .byte $36,$2E,$00,$AD,$AE,$17,$FE,$2A,$4E,$01,$00,$69,$11,$1F,$1F,$4E
235 .byte $B1,$92,$09,$00,$2D,$2D,$35,$3F,$3F,$37,$2D,$2D,$35,$3F,$3F,$37
236 .byte $2D,$2D,$35,$3F,$3F,$37,$2D,$2D,$75,$00,$40,$C0,$40,$18,$00,$40
237 .byte $C0,$40,$43,$00,$40,$C0,$40,$08,$00,$19,$00,$00
239 ; ------------------------------------------------------------------------
243 ; INIT: Changes an already installed device from text mode to graphics mode.
244 ; Note that INIT/DONE may be called multiple times while the driver
245 ; is loaded, while INSTALL is only called once, so any code that is needed
246 ; to initializes variables and so on must go here. Setting palette and
247 ; clearing the screen is not needed because this is called by the graphics
249 ; The graphics kernel will never call INIT when a graphics mode is already
250 ; active, so there is no need to protect against that.
251 ; Must set an error code: YES
254 ; Save and clear 80 column store
260 ; Switch into graphics mode
265 ; Done, reset the error code
271 ; INSTALL routine. Is called after the driver is loaded into memory. May
272 ; initialize anything that has to be done just once. Is probably empty
274 ; Must set an error code: NO
278 ; UNINSTALL routine. Is called before the driver is removed from memory. May
279 ; clean up anything done by INSTALL but is probably empty most of the time.
280 ; Must set an error code: NO
284 ; DONE: Will be called to switch the graphics device back into text mode.
285 ; The graphics kernel will never call DONE when no graphics mode is active,
286 ; so there is no need to protect against that.
287 ; Must set an error code: NO
289 ; Switch into text mode
294 ; Restore 80 column store
298 : bit LORES ; Limit SET80COL-HISCR to text
302 ; GETERROR: Return the error code in A and clear it.
309 ; CLEAR: Clears the screen.
310 ; Must set an error code: NO
312 bit $C082 ; Switch in ROM
314 bit $C080 ; Switch in LC bank 2 for R/O
317 ; SETVIEWPAGE: Set the visible page. Called with the new page in A (0..n).
318 ; The page number is already checked to be valid by the graphics kernel.
319 ; Must set an error code: NO (will only be called if page ok)
322 .assert LOWSCR + 1 = HISCR, error
323 lda LOWSCR,x ; No BIT absolute,X available
326 ; SETDRAWPAGE: Set the drawable page. Called with the new page in A (0..n).
327 ; The page number is already checked to be valid by the graphics kernel.
328 ; Must set an error code: NO (will only be called if page ok)
333 .byte $2C ; BIT absolute
334 : lda #>$2000 ; Page 1
338 ; SETCOLOR: Set the drawing color (in A). The new color is already checked
339 ; to be in a valid range (0..maxcolor-1).
340 ; Must set an error code: NO (will only be called if color ok)
342 bit $C082 ; Switch in ROM
345 bit $C080 ; Switch in LC bank 2 for R/O
348 ; CONTROL: Platform/driver specific entry point.
349 ; Must set an error code: YES
353 ; SETPALETTE: Set the palette (not available with all drivers/hardware).
354 ; A pointer to the palette is passed in ptr1. Must set an error if palettes
356 ; Must set an error code: YES
358 lda #TGI_ERR_INV_FUNC
362 ; GETPALETTE: Return the current palette in A/X. Even drivers that cannot
363 ; set the palette should return the default palette here, so there's no
364 ; way for this function to fail.
365 ; Must set an error code: NO
369 ; GETDEFPALETTE: Return the default palette for the driver in A/X. All
370 ; drivers should return something reasonable here, even drivers that don't
371 ; support palettes, otherwise the caller has no way to determine the colors
372 ; of the (not changeable) palette.
373 ; Must set an error code: NO (all drivers must have a default palette)
379 ; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
380 ; color. The coordinates passed to this function are never outside the
381 ; visible screen area, so there is no need for clipping inside this function.
382 ; Must set an error code: NO
384 bit $C082 ; Switch in ROM
389 bit $C080 ; Switch in LC bank 2 for R/O
404 jsr icmp ; ( x < xres ) ...
413 jsr icmp ; ... && ( y < yres )
417 ; GETPIXEL: Read the color value of a pixel and return it in A/X. The
418 ; coordinates passed to this function are never outside the visible screen
419 ; area, so there is no need for clipping inside this function.
421 bit $C082 ; Switch in ROM
432 adc #$03 ; += 4 (black -> black2, white -> white2)
434 bit $C080 ; Switch in LC bank 2 for R/O
437 ; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and
438 ; X2/Y2 = ptr3/ptr4 using the current drawing color.
439 ; Must set an error code: NO
441 bit $C082 ; Switch in ROM
450 bit $C080 ; Switch in LC bank 2 for R/O
453 ; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
454 ; X1/Y1 = ptr1/ptr2 and X2/Y2 = ptr3/ptr4 using the current drawing color.
455 ; Contrary to most other functions, the graphics kernel will sort and clip
456 ; the coordinates before calling the driver, so on entry the following
457 ; conditions are valid:
460 ; (X1 >= 0) && (X1 < XRES)
461 ; (X2 >= 0) && (X2 < XRES)
462 ; (Y1 >= 0) && (Y1 < YRES)
463 ; (Y2 >= 0) && (Y2 < YRES)
464 ; Must set an error code: NO
479 ; CIRCLE: Draw a circle around the center X1/Y1 (= ptr1/ptr2) with the
480 ; radius in tmp1 and the current drawing color.
481 ; Must set an error code: NO
485 jmp SETPIXELCLIP ; Plot as a point
504 stx YS+1 ; XS/YS to remember the center
514 ; Plot points in 8 slices...
520 sta X1+1 ; x1 = xs + x
527 sta Y1+1 ; (stack) = ys + y, y1 = (stack)
529 jsr SETPIXELCLIP ; plot (xs + x, ys + y)
536 sta Y1+1 ; y3 = y1 = ys - y
538 jsr SETPIXELCLIP ; plot (xs + x, ys - y)
549 jsr SETPIXELCLIP ; plot (xs - x, ys + y)
554 jsr SETPIXELCLIP ; plot (xs - x, ys - y)
561 sta X1+1 ; x1 = xs + y
568 sta Y1+1 ; (stack) = ys + x, y1 = (stack)
570 jsr SETPIXELCLIP ; plot (xs + y, ys + x)
577 sta Y1+1 ; y3 = y1 = ys - x
579 jsr SETPIXELCLIP ; plot (xs + y, ys - x)
583 sta Y1 ; y1 = ys + x(stack)
590 jsr SETPIXELCLIP ; plot (xs - y, ys + x)
595 jsr SETPIXELCLIP ; plot (xs - y, ys - x)
597 ; og = mo + y + y + 1
618 ; ou = og - x - x + 1
642 ; if (abs (ou) < abs (og)) {
676 ; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in X and Y
677 ; direction is passend in X/Y, the text direction is passed in A.
678 ; Must set an error code: NO
688 ; OUTTEXT: Output text at X/Y = ptr1/ptr2 using the current color and the
689 ; current text style. The text to output is given as a zero terminated
690 ; string with address in ptr3.
691 ; Must set an error code: NO
693 bit $C082 ; Switch in ROM
708 sub #$1F ; No controls
731 : bit $C080 ; Switch in LC bank 2 for R/O
734 ; Copies of some runtime routines
752 ; Compare A/Y to zp,X
753 sta TEMP ; TEMP/TEMP2 - arg2
761 tya ; X/A - arg1 (a = high)