view.c revision 1.10 
1/*	$NetBSD: view.c,v 1.10 1996/09/25 15:03:43 leo Exp $	*/
2
3/*
4 * Copyright (c) 1994 Christian E. Hopps
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 Christian E. Hopps.
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/* The view major device is a placeholder device.  It serves
34 * simply to map the semantics of a graphics dipslay to
35 * the semantics of a character block device.  In other
36 * words the graphics system as currently built does not like to be
37 * refered to by open/close/ioctl.  This device serves as
38 * a interface to graphics. */
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/proc.h>
43#include <sys/ioctl.h>
44#include <sys/file.h>
45#include <sys/device.h>
46#include <sys/malloc.h>
47#include <sys/queue.h>
48#include <sys/conf.h>
49#include <sys/poll.h>
50#include <machine/cpu.h>
51#include <atari/dev/grfabs_reg.h>
52#include <atari/dev/viewioctl.h>
53#include <atari/dev/viewvar.h>
54#include "view.h"
55
56static void view_display __P((struct view_softc *));
57static void view_remove __P((struct view_softc *));
58static int  view_setsize __P((struct view_softc *, struct view_size *));
59static int  view_get_colormap __P((struct view_softc *, colormap_t *));
60static int  view_set_colormap __P((struct view_softc *, colormap_t *));
61
62struct view_softc views[NVIEW];
63static int view_inited;
64
65int view_default_x;
66int view_default_y;
67int view_default_width  = 640;
68int view_default_height = 400;
69int view_default_depth  = 1;
70
71/*
72 *  functions for probeing.
73 */
74void	viewattach __P((int));
75
76void
77viewattach(cnt)
78	int cnt;
79{
80	viewprobe();
81	printf("%d view%s configured\n", NVIEW, NVIEW > 1 ? "s" : "");
82}
83
84/* this function is called early to set up a display. */
85int
86viewprobe()
87{
88    	int i;
89
90	if(view_inited)
91		return(1);
92
93	view_inited = 1;
94
95	for(i=0; i<NVIEW; i++) {
96		views[i].view = NULL;
97		views[i].flags = 0;
98	}
99	return(1);
100}
101
102
103/*
104 *  Internal functions.
105 */
106
107static void
108view_display (vu)
109	struct view_softc *vu;
110{
111	int s, i;
112
113	if (vu == NULL)
114		return;
115
116	s = spltty();
117
118	/*
119	 * mark views that share this monitor as not displaying
120	 */
121	for (i = 0; i < NVIEW; i++) {
122		if(views[i].flags & VUF_DISPLAY) {
123			if (vu->view && (vu->view == views[i].view)) {
124				splx(s);
125				return;
126			}
127			views[i].flags &= ~VUF_DISPLAY;
128		}
129	}
130
131	vu->flags |= VUF_ADDED;
132	if (vu->view) {
133		vu->view->display.x = vu->size.x;
134		vu->view->display.y = vu->size.y;
135
136		grf_display_view(vu->view);
137
138		vu->size.x = vu->view->display.x;
139		vu->size.y = vu->view->display.y;
140		vu->flags |= VUF_DISPLAY;
141	}
142	splx(s);
143}
144
145/*
146 * remove a view from our added list if it is marked as displaying
147 * switch to a new display.
148 */
149static void
150view_remove(vu)
151	struct view_softc *vu;
152{
153	int i;
154
155	if ((vu->flags & VUF_ADDED) == 0)
156		return;
157
158	vu->flags &= ~VUF_ADDED;
159	if (vu->flags & VUF_DISPLAY) {
160		for (i = 0; i < NVIEW; i++) {
161			if((views[i].flags & VUF_ADDED) && &views[i] != vu) {
162				view_display(&views[i]);
163				break;
164			}
165		}
166	}
167	vu->flags &= ~VUF_DISPLAY;
168	grf_remove_view(vu->view);
169}
170
171static int
172view_setsize(vu, vs)
173	struct view_softc *vu;
174	struct view_size *vs;
175{
176	view_t	*new, *old;
177	dmode_t	*dmode;
178	dimen_t ns;
179	int	co, cs;
180
181	co = 0;
182	cs = 0;
183	if (vs->x != vu->size.x || vs->y != vu->size.y)
184		co = 1;
185
186	if (vs->width != vu->size.width || vs->height != vu->size.height ||
187	    vs->depth != vu->size.depth)
188		cs = 1;
189
190	if (cs == 0 && co == 0)
191		return(0);
192
193	ns.width  = vs->width;
194	ns.height = vs->height;
195
196	if((dmode = grf_get_best_mode(&ns, vs->depth)) != NULL) {
197		/*
198		 * If we can't do better, leave it
199		 */
200		if(dmode == vu->view->mode)
201			return(0);
202	}
203	new = grf_alloc_view(dmode, &ns, vs->depth);
204	if (new == NULL)
205		return(ENOMEM);
206
207	old = vu->view;
208	vu->view = new;
209	vu->size.x = new->display.x;
210	vu->size.y = new->display.y;
211	vu->size.width = new->display.width;
212	vu->size.height = new->display.height;
213	vu->size.depth = new->bitmap->depth;
214
215	/*
216	 * we need a custom remove here to avoid letting
217	 * another view display mark as not added or displayed
218	 */
219	if (vu->flags & VUF_DISPLAY) {
220		vu->flags &= ~(VUF_ADDED|VUF_DISPLAY);
221		view_display(vu);
222	}
223	grf_free_view(old);
224	return(0);
225}
226
227static int
228view_get_colormap (vu, ucm)
229struct view_softc	*vu;
230colormap_t		*ucm;
231{
232	int	error;
233	long	*cme;
234	long	*uep;
235
236	if(ucm->size > MAX_CENTRIES)
237		return(EINVAL);
238
239	/* add one incase of zero, ick. */
240	cme = malloc(sizeof(ucm->entry[0])*(ucm->size+1), M_IOCTLOPS,M_WAITOK);
241	if (cme == NULL)
242		return(ENOMEM);
243
244	error      = 0;
245	uep        = ucm->entry;
246	ucm->entry = cme;	  /* set entry to out alloc. */
247	if(vu->view == NULL || grf_get_colormap(vu->view, ucm))
248		error = EINVAL;
249	else error = copyout(cme, uep, sizeof(ucm->entry[0]) * ucm->size);
250	ucm->entry = uep;	  /* set entry back to users. */
251	free(cme, M_IOCTLOPS);
252	return(error);
253}
254
255static int
256view_set_colormap(vu, ucm)
257struct view_softc	*vu;
258colormap_t		*ucm;
259{
260	colormap_t	*cm;
261	int		error = 0;
262
263	if(ucm->size > MAX_CENTRIES)
264		return(EINVAL);
265
266	cm = malloc(sizeof(ucm->entry[0])*ucm->size + sizeof(*cm), M_IOCTLOPS,
267								M_WAITOK);
268	if(cm == NULL)
269		return(ENOMEM);
270
271	bcopy(ucm, cm, sizeof(colormap_t));
272	cm->entry = (long *)&cm[1];		 /* table directly after. */
273	if (((error =
274	    copyin(ucm->entry,cm->entry,sizeof(ucm->entry[0])*ucm->size)) == 0)
275	    && (vu->view == NULL || grf_use_colormap(vu->view, cm)))
276		error = EINVAL;
277	free(cm, M_IOCTLOPS);
278	return(error);
279}
280
281/*
282 *  functions made available by conf.c
283 */
284
285/*ARGSUSED*/
286int
287viewopen(dev, flags, mode, p)
288dev_t		dev;
289int		flags;
290int		mode;
291struct proc	*p;
292{
293	dimen_t			size;
294	struct view_softc	*vu;
295
296	vu = &views[minor(dev)];
297
298	if(minor(dev) >= NVIEW)
299		return(EXDEV);
300	if(vu->flags & VUF_OPEN)
301		return(EBUSY);
302
303	vu->size.x = view_default_x;
304	vu->size.y = view_default_y;
305	size.width = vu->size.width = view_default_width;
306	size.height = vu->size.height = view_default_height;
307	vu->size.depth = view_default_depth;
308	vu->view = grf_alloc_view(NULL, &size, vu->size.depth);
309	if (vu->view == NULL)
310		return(ENOMEM);
311
312	vu->size.x = vu->view->display.x;
313	vu->size.y = vu->view->display.y;
314	vu->size.width = vu->view->display.width;
315	vu->size.height = vu->view->display.height;
316	vu->size.depth = vu->view->bitmap->depth;
317       	vu->flags |= VUF_OPEN;
318       	return(0);
319}
320
321/*ARGSUSED*/
322int
323viewclose (dev, flags, mode, p)
324	dev_t		dev;
325	int 		flags;
326	int		mode;
327	struct proc	*p;
328{
329	struct view_softc *vu;
330
331	vu = &views[minor(dev)];
332
333	if ((vu->flags & VUF_OPEN) == 0)
334		return (0); /* XXX not open? */
335	view_remove (vu);
336	grf_free_view (vu->view);
337	vu->flags = 0;
338	vu->view = NULL;
339	return (0);
340}
341
342
343/*ARGSUSED*/
344int
345viewioctl (dev, cmd, data, flag, p)
346dev_t		dev;
347u_long		cmd;
348caddr_t		data;
349int		flag;
350struct proc	*p;
351{
352	struct view_softc	*vu;
353	bmap_t			*bm;
354	int			error;
355
356	vu = &views[minor(dev)];
357	error = 0;
358
359	switch (cmd) {
360	case VIOCDISPLAY:
361		view_display(vu);
362		break;
363	case VIOCREMOVE:
364		view_remove(vu);
365		break;
366	case VIOCGSIZE:
367		bcopy(&vu->size, data, sizeof (struct view_size));
368		break;
369	case VIOCSSIZE:
370		error = view_setsize(vu, (struct view_size *)data);
371		break;
372	case VIOCGBMAP:
373		bm = (bmap_t *)data;
374		bcopy(vu->view->bitmap, bm, sizeof(bmap_t));
375		if (p != NOPROC) {
376			bm->plane      = NULL;
377			bm->hw_address = NULL;
378			bm->regs       = NULL;
379			bm->hw_regs    = NULL;
380		}
381		break;
382	case VIOCGCMAP:
383		error = view_get_colormap(vu, (colormap_t *)data);
384		break;
385	case VIOCSCMAP:
386		error = view_set_colormap(vu, (colormap_t *)data);
387		break;
388	default:
389		error = EINVAL;
390		break;
391	}
392	return(error);
393}
394
395/*ARGSUSED*/
396int
397viewmmap(dev, off, prot)
398dev_t	dev;
399int	off, prot;
400{
401	struct view_softc	*vu;
402	bmap_t			*bm;
403	u_char			*bmd_start;
404	u_long			bmd_size;
405
406	vu = &views[minor(dev)];
407	bm = vu->view->bitmap;
408	bmd_start = bm->hw_address;
409	bmd_size = bm->bytes_per_row*bm->rows*bm->depth;
410
411	if (off >= 0 && off < bmd_size)
412		return(((u_int)bmd_start + off) >> PGSHIFT);
413
414	return(-1);
415}
416
417/*ARGSUSED*/
418int
419viewpoll(dev, events, p)
420dev_t		dev;
421int		events;
422struct proc	*p;
423{
424	int revents = 0;
425
426	if (events & (POLLOUT | POLLWRNORM))
427		revents |= events & (POLLOUT | POLLWRNORM);
428	return (revents);
429}
430
431view_t	*
432viewview(dev)
433dev_t	dev;
434{
435	return(views[minor(dev)].view);
436}
437