grfabs.c revision 1.1 
1/*	$NetBSD: grfabs.c,v 1.1 1995/03/26 07:12:15 leo Exp $	*/
2
3/*
4 * Copyright (c) 1995 Leo Weppelman.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *      This product includes software developed by Leo Weppelman.
18 * 4. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 *  atari abstract graphics driver.
35 */
36#include <sys/param.h>
37#include <sys/queue.h>
38#include <sys/malloc.h>
39
40#include <machine/iomap.h>
41#include <machine/video.h>
42#include <machine/mfp.h>
43#include <atari/dev/grfabs_reg.h>
44
45/*
46 * Function decls
47 */
48static dmode_t    *get_best_display_mode __P((int, int, int));
49static view_t     *alloc_view __P((dmode_t *, dimen_t *, u_char));
50static void       init_view __P((view_t *, bmap_t *, dmode_t *, box_t *));
51static bmap_t	  *alloc_bitmap __P((u_long, u_long, u_char, int));
52static void 	  free_bitmap __P((bmap_t *));
53static colormap_t *alloc_colormap __P((dmode_t *));
54
55/*
56 * Ugh.. Stuff needed to allocate console structures before the VM-system
57 * is running. There is no malloc() available at that time.
58 */
59extern int		atari_realconfig;	/* 0 -> no malloc	*/
60static view_t		con_view;
61static colormap_t	con_cmap;
62static u_short		con_colors[MAX_CENTRIES];
63
64/*
65 * List of available graphic modes
66 */
67static LIST_HEAD(modelist, display_mode) modes;
68
69static dmode_t vid_modes[] = {
70	{ { NULL, NULL }, "stlow",  { 320,  200 },  1, RES_STLOW  },
71	{ { NULL, NULL }, "stmid",  { 640,  200 },  2, RES_STMID  },
72	{ { NULL, NULL }, "sthigh", { 640,  400 },  1, RES_STHIGH },
73	{ { NULL, NULL }, "ttlow",  { 320,  480 },  8, RES_TTLOW  },
74	{ { NULL, NULL }, "ttmid",  { 640,  480 },  4, RES_TTMID  },
75	{ { NULL, NULL }, "tthigh", { 1280, 960 },  1, RES_TTHIGH },
76	{ { NULL, NULL }, NULL,  }
77};
78
79/*
80 * Default colors.....
81 * Currently the TT-low (256 colors) just uses 16 time the 16-color default.
82 * If you have a sensible 256 scale, feel free to add.....
83 * The first 2 colors in all maps are {black,white}, so ite (text) displays
84 * are initially readable. Also, this enables me to supply only 1 map. The
85 * 4 color mode uses the first four entries of the 16 color mode thus giving
86 * a gray scale display. (Maybe we can add an intensity bit to the ite...)
87 */
88static u_short def_color16[16] = {
89	0x000,	/* black		*/
90	0xfff,	/* white		*/
91	0xccc,	/* light gray		*/
92	0x888,	/* gray			*/
93	0x00c,	/* blue			*/
94	0x0c0,	/* green		*/
95	0x0cc,	/* cyan			*/
96	0xc00,	/* red			*/
97	0xc0c,	/* magenta		*/
98	0xcc0,	/* brown		*/
99	0x00f,	/* light blue		*/
100	0x0f0,	/* light green		*/
101	0x0ff,	/* light cyan		*/
102	0xf00,	/* light red		*/
103	0xf0f,	/* light magenta	*/
104	0xff0	/* light brown		*/
105};
106
107/*
108 * XXX: called from ite console init routine.
109 * Initialize list of posible video modes.
110 */
111int
112grfabs_probe()
113{
114		dmode_t	*dm;
115		int	i;
116		int	has_mono;
117	static  int	inited = 0;
118
119	if(inited)
120		return;	/* Has to be done only once */
121	inited++;
122
123	/*
124	 * First find out what kind of monitor is attached. Dma-sound
125	 * should be off because the 'sound-done' and 'monochrome-detect'
126	 * are xor-ed together. I think that shutting it down here is the
127	 * wrong place.
128	 */
129	has_mono = (MFP->mf_gpip & IA_MONO) == 0;
130
131	LIST_INIT(&modes);
132	for(i = 0; (dm = &vid_modes[i])->name != NULL; i++) {
133		if(has_mono && (dm->vm_reg != RES_TTHIGH))
134			continue;
135		if(!has_mono && (dm->vm_reg == RES_TTHIGH))
136			continue;
137		LIST_INSERT_HEAD(&modes, dm, link);
138	}
139	return(1);
140}
141
142view_t *
143grf_alloc_view(d, dim, depth)
144dmode_t	*d;
145dimen_t	*dim;
146u_char	depth;
147{
148	if(!d)
149		d = get_best_display_mode(dim->width, dim->height, depth);
150	if(d)
151		return(alloc_view(d, dim, depth));
152	return(NULL);
153}
154
155void grf_display_view(v)
156view_t *v;
157{
158	dmode_t	*dm = v->mode;
159	bmap_t	*bm = v->bitmap;
160
161	if(dm->current_view) {
162		/*
163		 * Mark current view for this mode as no longer displayed
164		 */
165		dm->current_view->flags &= ~VF_DISPLAY;
166	}
167	dm->current_view = v;
168	v->flags |= VF_DISPLAY;
169
170	grf_use_colormap(v, v->colormap);
171
172	/* XXX: should use vbl for this	*/
173	VIDEO->vd_tt_res = dm->vm_reg;
174	VIDEO->vd_raml   =  (u_long)bm->hw_address & 0xff;
175	VIDEO->vd_ramm   = ((u_long)bm->hw_address >>  8) & 0xff;
176	VIDEO->vd_ramh   = ((u_long)bm->hw_address >> 16) & 0xff;
177}
178
179void grf_remove_view(v)
180view_t *v;
181{
182	dmode_t *mode = v->mode;
183
184	if(mode->current_view == v) {
185#if 0
186		if(v->flags & VF_DISPLAY)
187			panic("Cannot shutdown display\n"); /* XXX */
188#endif
189		mode->current_view = NULL;
190	}
191	v->flags &= ~VF_DISPLAY;
192}
193
194void grf_free_view(v)
195view_t *v;
196{
197	if(v) {
198		dmode_t *md = v->mode;
199
200		grf_remove_view(v);
201		if(v->colormap != &con_cmap)
202			free(v->colormap, M_DEVBUF);
203		free_bitmap(v->bitmap);
204		if(v != &con_view)
205			free(v, M_DEVBUF);
206	}
207}
208
209int
210grf_get_colormap(v, cm)
211view_t		*v;
212colormap_t	*cm;
213{
214	colormap_t	*gcm;
215	int		i, n;
216
217	bzero(cm->centry, cm->nentries * sizeof(u_short));
218
219	gcm = v->colormap;
220	n   = cm->nentries < gcm->nentries ? cm->nentries : gcm->nentries;
221	for(i = 0; i < n; i++)
222		cm->centry[i] = gcm->centry[i];
223	return(0);
224}
225
226int
227grf_use_colormap(v, cm)
228view_t		*v;
229colormap_t	*cm;
230{
231	dmode_t			*dm;
232	volatile u_short	*creg;
233	u_short			*src;
234	u_short			ncreg;
235	int			i;
236
237	dm = v->mode;
238
239	switch(dm->vm_reg) {
240		case RES_STLOW:
241			creg  = &VIDEO->vd_tt_rgb[0];
242			ncreg = 16;
243		break;
244		case RES_STMID:
245			creg  = &VIDEO->vd_tt_rgb[0];
246			ncreg = 4;
247			break;
248		case RES_STHIGH:
249			creg  = &VIDEO->vd_tt_rgb[254];
250			ncreg = 2;
251			break;
252		case RES_TTLOW:
253			creg  = &VIDEO->vd_tt_rgb[0];
254			ncreg = 256;
255			break;
256		case RES_TTMID:
257			creg  = &VIDEO->vd_tt_rgb[0];
258			ncreg = 16;
259			break;
260		case RES_TTHIGH:
261			return(0);	/* No colors	*/
262		default:
263			panic("grf_get_colormap: wrong mode!?");
264	}
265	if(cm->nentries < ncreg)
266		ncreg = cm->nentries;
267
268	for(i = 0, src = cm->centry; i < ncreg; i++)
269		*creg++ = *src++;
270	return(0);
271}
272
273static dmode_t *
274get_best_display_mode(width, height, depth)
275int	width, height, depth;
276{
277	dmode_t		*save;
278	dmode_t		*dm;
279	long   		dt, dx, dy, ct;
280
281	save = NULL;
282	dm = modes.lh_first;
283	while(dm != NULL) {
284		if(depth > dm->depth) {
285			dm = dm->link.le_next;
286			continue;
287		}
288		else if(width > dm->size.width || height > dm->size.height) {
289			dm = dm->link.le_next;
290			continue;
291		}
292		else if (width < dm->size.width || height < dm->size.height) {
293			dm = dm->link.le_next;
294			continue;
295		}
296		dx = abs(dm->size.width  - width);
297		dy = abs(dm->size.height - height);
298		ct = dx + dy;
299
300		if (ct < dt || save == NULL) {
301			save = dm;
302			dt = ct;
303		}
304		dm = dm->link.le_next;
305	}
306	return (save);
307}
308
309static view_t *
310alloc_view(mode, dim, depth)
311dmode_t	*mode;
312dimen_t	*dim;
313u_char   depth;
314{
315	view_t *v;
316	bmap_t *bm;
317
318	if(!atari_realconfig)
319		v = &con_view;
320	else v = malloc(sizeof(*v), M_DEVBUF, M_WAITOK);
321
322	bm = alloc_bitmap(mode->size.width, mode->size.height, mode->depth, 1);
323	if(bm) {
324		int     i;
325		box_t   box;
326
327		v->colormap = alloc_colormap(mode);
328		if(v->colormap) {
329			INIT_BOX(&box,0,0,mode->size.width,mode->size.height);
330			init_view(v, bm, mode, &box);
331			return(v);
332		}
333		free_bitmap(bm);
334	}
335	if(v != &con_view)
336		free(v, M_DEVBUF);
337	return (NULL);
338}
339
340static void
341init_view(v, bm, mode, dbox)
342view_t	*v;
343bmap_t	*bm;
344dmode_t	*mode;
345box_t	*dbox;
346{
347	v->bitmap = bm;
348	v->mode   = mode;
349	bcopy(dbox, &v->display, sizeof(box_t));
350}
351
352/* bitmap functions */
353
354static bmap_t *
355alloc_bitmap(width, height, depth, clear)
356u_long	width, height;
357u_char	depth;
358int	clear;
359{
360	int     i;
361	u_long  total_size, bm_size;
362	void	*hw_address;
363	bmap_t	*bm;
364
365	/*
366	 * Sigh, it seems for mapping to work we need the bitplane data to
367	 *  1: be aligned on a page boundry.
368	 *  2: be n pages large.
369	 *
370	 * why? because the user gets a page aligned address, if this is before
371	 * your allocation, too bad.  Also it seems that the mapping routines
372	 * do not watch to closely to the allowable length. so if you go over
373	 * n pages by less than another page, the user gets to write all over
374	 * the entire page. Since you did not allocate up to a page boundry
375	 * (or more) the user writes into someone elses memory. -ch
376	 */
377	bm_size    = atari_round_page((width * height * depth) / NBBY);
378	total_size = bm_size + sizeof(bmap_t) + NBPG;
379
380	if((bm = (bmap_t*)alloc_stmem(total_size, &hw_address)) == NULL)
381		return(NULL);
382
383	bm->plane         = (u_char*)bm + sizeof(bmap_t);
384	bm->plane         = (u_char*)atari_round_page(bm->plane);
385	bm->hw_address    = (u_char*)hw_address + sizeof(bmap_t);
386	bm->hw_address    = (u_char*)atari_round_page(bm->hw_address);
387	bm->bytes_per_row = (width * depth) / NBBY;
388	bm->rows          = height;
389	bm->depth         = depth;
390
391	if(clear)
392		bzero(bm->plane, bm_size);
393	return(bm);
394}
395
396static void
397free_bitmap(bm)
398bmap_t *bm;
399{
400	if(bm)
401		free_stmem(bm);
402}
403
404static colormap_t *
405alloc_colormap(dm)
406dmode_t		*dm;
407{
408	int		nentries, i;
409	colormap_t	*cm;
410
411	switch(dm->vm_reg) {
412		case RES_STLOW:
413		case RES_TTMID:
414			nentries = 16;
415			break;
416		case RES_STMID:
417			nentries = 4;
418			break;
419		case RES_STHIGH:
420			nentries = 2;
421			break;
422		case RES_TTLOW:
423			nentries = 256;
424			break;
425		case RES_TTHIGH:
426			nentries = 0;
427		default:
428			panic("grf:alloc_colormap: wrong mode!?");
429	}
430	if(!atari_realconfig) {
431		cm = &con_cmap;
432		cm->centry = con_colors;
433	}
434	else {
435		int size;
436
437		size = sizeof(*cm) + (nentries * sizeof(u_short));
438		cm   = malloc(size, M_DEVBUF, M_WAITOK);
439		if(cm == NULL)
440			return(NULL);
441		cm->centry = (u_short *)&cm[1];
442
443	}
444	cm->nentries = nentries;
445
446	for(i = 0; i < nentries; i++)
447		cm->centry[i] = def_color16[i % 16];
448	return(cm);
449}
450