[ViewVC] Diff of: cvs/deliantra/server/common/los.C

Comparing deliantra/server/common/los.C (file contents):
Revision 1.23 by root, Fri Feb 16 22:21:45 2007 UTC vs.
Revision 1.48 by root, Tue Dec 23 06:58:23 2008 UTC

…		…
1	/*	1	/*
2	* CrossFire, A Multiplayer game for X-windows	2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	*	3	*
4	* Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team	4	* Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	* Copyright (C) 2002 Mark Wedel & Crossfire Development Team	5	* Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team
6	* Copyright (C) 1992 Frank Tore Johansen	6	* Copyright (©) 1992,2007 Frank Tore Johansen
7	*	7	*
8	* This program is free software; you can redistribute it and/or modify	8	* Deliantra is free software: you can redistribute it and/or modify
9	* it under the terms of the GNU General Public License as published by	9	* it under the terms of the GNU General Public License as published by
10	* the Free Software Foundation; either version 2 of the License, or	10	* the Free Software Foundation, either version 3 of the License, or
11	* (at your option) any later version.	11	* (at your option) any later version.
12	*	12	*
13	* This program is distributed in the hope that it will be useful,	13	* This program is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	* GNU General Public License for more details.	16	* GNU General Public License for more details.
17	*	17	*
18	* You should have received a copy of the GNU General Public License	18	* You should have received a copy of the GNU General Public License
19	* along with this program; if not, write to the Free Software	19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
20	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21	*	20	*
22	* The authors can be reached via e-mail at <crossfire@schmorp.de>	21	* The authors can be reached via e-mail to <support@deliantra.net>
23	*/	22	*/
24		23
25	/* Nov 95 - inserted USE_LIGHTING code stuff in here - b.t. */	24	/* Nov 95 - inserted USE_LIGHTING code stuff in here - b.t. */
26		25
27	#include <global.h>	26	#include <global.h>
28	#include <funcpoint.h>
29	#include <math.h>	27	#include <cmath>
30
31	/* Distance must be less than this for the object to be blocked.
32	* An object is 1.0 wide, so if set to 0.5, it means the object
33	* that blocks half the view (0.0 is complete block) will
34	* block view in our tables.
35	* .4 or less lets you see through walls. .5 is about right.
36	*/
37
38	#define SPACE_BLOCK 0.5
39
40	typedef struct blstr
41	{
42	int x[4], y[4];
43	int index;
44	} blocks;
45
46	// 31/32 == a speed hack
47	// we would like to use 32 for speed, but the code loops endlessly
48	// then, reason not yet identified, so only make the array use 32,
49	// not the define's.
50	blocks block[MAP_CLIENT_X][MAP_CLIENT_Y == 31 ? 32 : MAP_CLIENT_Y];
51		28
52	static void expand_lighted_sight (object *op);	29	static void expand_lighted_sight (object *op);
53		30
54	/*	31	enum {
55	* Used to initialise the array used by the LOS routines.	32	LOS_XI = 0x01,
56	* What this sets if that x,y blocks the view of bx,by	33	LOS_YI = 0x02,
57	* This then sets up a relation - for example, something	34	};
58	* at 5,4 blocks view at 5,3 which blocks view at 5,2
59	* etc. So when we check 5,4 and find it block, we have
60	* the data to know that 5,3 and 5,2 and 5,1 should also
61	* be blocked.
62	*/
63		35
64	static void	36	struct los_info
65	set_block (int x, int y, int bx, int by)
66	{	37	{
67	int index = block[x][y].index, i;	38	sint8 xo, yo; // obscure angle
		39	sint8 xe, ye; // angle deviation
		40	uint8 culled; // culled from "tree"
		41	uint8 queued; // already queued
		42	uint8 visible;
		43	uint8 flags; // LOS_XI/YI
		44	};
68		45
69	/* Due to flipping, we may get duplicates - better safe than sorry.	46	// temporary storage for the los algorithm,
70	*/	47	// one los_info for each lightable map space
71	for (i = 0; i < index; i++)	48	static los_info los[MAP_CLIENT_X][MAP_CLIENT_Y];
72	{
73	if (block[x][y].x[i] == bx && block[x][y].y[i] == by)
74	return;
75	}
76		49
77	block[x][y].x[index] = bx;	50	struct point
78	block[x][y].y[index] = by;
79	block[x][y].index++;
80	#ifdef LOS_DEBUG
81	LOG (llevDebug, "setblock: added %d %d -> %d %d (%d)\n", x, y, bx, by, block[x][y].index);
82	#endif
83	}
84
85	/*
86	* initialises the array used by the LOS routines.
87	*/
88
89	/* since we are only doing the upper left quadrant, only
90	* these spaces could possibly get blocked, since these
91	* are the only ones further out that are still possibly in the
92	* sightline.
93	*/
94
95	void
96	init_block (void)
97	{	51	{
98	int x, y, dx, dy, i;
99	static int block_x[3] = { -1, -1, 0 }, block_y[3] =
100	{
101	-1, 0, -1};
102
103	for (x = 0; x < MAP_CLIENT_X; x++)
104	for (y = 0; y < MAP_CLIENT_Y; y++)
105	{
106	block[x][y].index = 0;
107	}
108
109
110	/* The table should be symmetric, so only do the upper left
111	* quadrant - makes the processing easier.
112	*/
113	for (x = 1; x <= MAP_CLIENT_X / 2; x++)
114	{
115	for (y = 1; y <= MAP_CLIENT_Y / 2; y++)
116	{
117	for (i = 0; i < 3; i++)
118	{
119	dx = x + block_x[i];
120	dy = y + block_y[i];
121
122	/* center space never blocks */
123	if (x == MAP_CLIENT_X / 2 && y == MAP_CLIENT_Y / 2)
124	continue;
125
126	/* If its a straight line, its blocked */
127	if ((dx == x && x == MAP_CLIENT_X / 2) \|\| (dy == y && y == MAP_CLIENT_Y / 2))
128	{
129	/* For simplicity, we mirror the coordinates to block the other
130	* quadrants.
131	*/
132	set_block (x, y, dx, dy);
133	if (x == MAP_CLIENT_X / 2)
134	{
135	set_block (x, MAP_CLIENT_Y - y - 1, dx, MAP_CLIENT_Y - dy - 1);
136	}
137	else if (y == MAP_CLIENT_Y / 2)
138	{
139	set_block (MAP_CLIENT_X - x - 1, y, MAP_CLIENT_X - dx - 1, dy);
140	}
141	}
142	else
143	{
144	float d1, r, s, l;
145
146	/* We use the algorihm that found out how close the point
147	* (x,y) is to the line from dx,dy to the center of the viewable
148	* area. l is the distance from x,y to the line.
149	* r is more a curiosity - it lets us know what direction (left/right)
150	* the line is off
151	*/
152
153	d1 = (float) (pow (MAP_CLIENT_X / 2 - dx, 2.f) + pow (MAP_CLIENT_Y / 2 - dy, 2.f));
154	r = (float) ((dy - y) * (dy - MAP_CLIENT_Y / 2) - (dx - x) * (MAP_CLIENT_X / 2 - dx)) / d1;
155	s = (float) ((dy - y) * (MAP_CLIENT_X / 2 - dx) - (dx - x) * (MAP_CLIENT_Y / 2 - dy)) / d1;
156	l = FABS (sqrt (d1) * s);
157
158	if (l <= SPACE_BLOCK)
159	{
160	/* For simplicity, we mirror the coordinates to block the other
161	* quadrants.
162	*/
163	set_block (x, y, dx, dy);
164	set_block (MAP_CLIENT_X - x - 1, y, MAP_CLIENT_X - dx - 1, dy);
165	set_block (x, MAP_CLIENT_Y - y - 1, dx, MAP_CLIENT_Y - dy - 1);
166	set_block (MAP_CLIENT_X - x - 1, MAP_CLIENT_Y - y - 1, MAP_CLIENT_X - dx - 1, MAP_CLIENT_Y - dy - 1);
167	}
168	}
169	}
170	}
171	}
172	}
173
174	/*
175	* Used to initialise the array used by the LOS routines.
176	* x,y are indexes into the blocked[][] array.
177	* This recursively sets the blocked line of sight view.
178	* From the blocked[][] array, we know for example
179	* that if some particular space is blocked, it blocks
180	* the view of the spaces 'behind' it, and those blocked
181	* spaces behind it may block other spaces, etc.
182	* In this way, the chain of visibility is set.
183	*/
184
185	static void
186	set_wall (object *op, int x, int y)
187	{
188	int i;
189
190	for (i = 0; i < block[x][y].index; i++)
191	{
192	int dx = block[x][y].x[i], dy = block[x][y].y[i], ax, ay;
193
194	/* ax, ay are the values as adjusted to be in the
195	* socket look structure.
196	*/
197	ax = dx - (MAP_CLIENT_X - op->contr->ns->mapx) / 2;
198	ay = dy - (MAP_CLIENT_Y - op->contr->ns->mapy) / 2;
199
200	if (ax < 0 \|\| ax >= op->contr->ns->mapx \|\| ay < 0 \|\| ay >= op->contr->ns->mapy)
201	continue;
202	#if 0
203	LOG (llevDebug, "blocked %d %d -> %d %d\n", dx, dy, ax, ay);
204	#endif
205	/* we need to adjust to the fact that the socket
206	* code wants the los to start from the 0,0
207	* and not be relative to middle of los array.
208	*/
209	op->contr->blocked_los[ax][ay] = 100;
210	set_wall (op, dx, dy);
211	}
212	}
213
214	/*
215	* Used to initialise the array used by the LOS routines.
216	* op is the object, x and y values based on MAP_CLIENT_X and Y.
217	* this is because they index the blocked[][] arrays.
218	*/
219
220	static void
221	check_wall (object *op, int x, int y)
222	{
223	int ax, ay;	52	sint8 x, y;
		53	};
224		54
225	if (!block[x][y].index)	55	// minimum size, but must be a power of two
226	return;	56	#define QUEUE_LENGTH ((MAP_CLIENT_X + MAP_CLIENT_Y) * 2)
227		57
228	/* ax, ay are coordinates as indexed into the look window */	58	// a queue of spaces to calculate
229	ax = x - (MAP_CLIENT_X - op->contr->ns->mapx) / 2;	59	static point queue [QUEUE_LENGTH];
230	ay = y - (MAP_CLIENT_Y - op->contr->ns->mapy) / 2;	60	static int q1, q2; // queue start, end
231
232	/* If the converted coordinates are outside the viewable
233	* area for the client, return now.
234	*/
235	if (ax < 0 \|\| ay < 0 \|\| ax >= op->contr->ns->mapx \|\| ay >= op->contr->ns->mapy)
236	return;
237
238	#if 0
239	LOG (llevDebug, "check_wall, ax,ay=%d, %d x,y = %d, %d blocksview = %d, %d\n",
240	ax, ay, x, y, op->x + x - MAP_CLIENT_X / 2, op->y + y - MAP_CLIENT_Y / 2);
241	#endif
242
243	/* If this space is already blocked, prune the processing - presumably
244	* whatever has set this space to be blocked has done the work and already
245	* done the dependency chain.
246	*/
247	if (op->contr->blocked_los[ax][ay] == 100)
248	return;
249
250
251	if (get_map_flags (op->map, NULL, op->x + x - MAP_CLIENT_X / 2, op->y + y - MAP_CLIENT_Y / 2, NULL, NULL) & (P_BLOCKSVIEW \| P_OUT_OF_MAP))
252	set_wall (op, x, y);
253	}
254		61
255	/*	62	/*
256	* Clears/initialises the los-array associated to the player	63	* Clears/initialises the los-array associated to the player
257	* controlling the object.	64	* controlling the object.
258	*/	65	*/
259
260	void	66	void
261	clear_los (object *op)	67	player::clear_los (sint8 value)
262	{	68	{
263	/* This is safer than using the ns->mapx, mapy because	69	memset (los, value, sizeof (los));
264	* we index the blocked_los as a 2 way array, so clearing
265	* the first z spaces may not not cover the spaces we are
266	* actually going to use
267	*/
268	(void) memset ((void ) op->contr->blocked_los, 0, MAP_CLIENT_X MAP_CLIENT_Y);
269	}	70	}
270		71
271	/*	72	// enqueue a single mapspace, but only if it hasn't
272	* expand_sight goes through the array of what the given player is	73	// been enqueued yet.
273	* able to see, and expands the visible area a bit, so the player will,
274	* to a certain degree, be able to see into corners.
275	* This is somewhat suboptimal, would be better to improve the formula.
276	*/
277
278	static void	74	static void
279	expand_sight (object *op)	75	enqueue (sint8 dx, sint8 dy, uint8 flags = 0)
280	{	76	{
281	int i, x, y, dx, dy;	77	sint8 x = LOS_X0 + dx;
		78	sint8 y = LOS_Y0 + dy;
282		79
283	for (x = 1; x < op->contr->ns->mapx - 1; x++) /* loop over inner squares */	80	if (x < 0 \|\| x >= MAP_CLIENT_X) return;
284	for (y = 1; y < op->contr->ns->mapy - 1; y++)	81	if (y < 0 \|\| y >= MAP_CLIENT_Y) return;
		82
		83	los_info &l = los[x][y];
		84
		85	l.flags \|= flags;
		86
		87	if (l.queued)
		88	return;
		89
		90	l.queued = 1;
		91
		92	queue[q1].x = dx;
		93	queue[q1].y = dy;
		94
		95	q1 = (q1 + 1) & (QUEUE_LENGTH - 1);
		96	}
		97
		98	// run the los algorithm
		99	// this is a variant of a spiral los algorithm taken from
		100	// http://www.geocities.com/temerra/los_rays.html
		101	// which has been simplified and changed considerably, but
		102	// still is basically the same algorithm.
		103	static void
		104	calculate_los (player *pl)
		105	{
		106	int max_radius = max (pl->ns->mapx, pl->ns->mapy) / 2;
		107
		108	memset (los, 0, sizeof (los));
		109
		110	q1 = 0; q2 = 0; // initialise queue, not strictly required
		111	enqueue (0, 0); // enqueue center
		112
		113	// treat the origin specially
		114	los[LOS_X0][LOS_Y0].visible = 1;
		115	pl->los[LOS_X0][LOS_Y0] = 0;
		116
		117	// loop over all enqueued points until the queue is empty
		118	// the order in which this is done ensures that we
		119	// never touch a mapspace whose input spaces we haven't checked
		120	// yet.
		121	while (q1 != q2)
		122	{
		123	sint8 dx = queue[q2].x;
		124	sint8 dy = queue[q2].y;
		125
		126	q2 = (q2 + 1) & (QUEUE_LENGTH - 1);
		127
		128	sint8 x = LOS_X0 + dx;
		129	sint8 y = LOS_Y0 + dy;
		130
		131	//int distance = idistance (dx, dy); if (distance > max_radius) continue;//D
		132	int distance = 0;//D
		133
		134	los_info &l = los[x][y];
		135
		136	if (expect_true (l.flags & (LOS_XI \| LOS_YI)))
285	{	137	{
286	if (!op->contr->blocked_los[x][y] &&	138	l.culled = 1;
287	!(get_map_flags (op->map, NULL,	139
288	op->x - op->contr->ns->mapx / 2 + x,	140	// check contributing spaces, first horizontal
289	op->y - op->contr->ns->mapy / 2 + y, NULL, NULL) & (P_BLOCKSVIEW \| P_OUT_OF_MAP)))	141	if (expect_true (l.flags & LOS_XI))
290	{	142	{
		143	los_info *xi = &los[x - sign (dx)][y];
291		144
292	for (i = 1; i <= 8; i += 1)	145	// don't cull unless obscured
293	{ /* mark all directions */	146	l.culled &= !xi->visible;
294	dx = x + freearr_x[i];	147
295	dy = y + freearr_y[i];	148	/* merge input space */
296	if (op->contr->blocked_los[dx][dy] > 0) /* for any square blocked */	149	if (expect_false (xi->xo \|\| xi->yo))
297	op->contr->blocked_los[dx][dy] = -1;	150	{
		151	// The X input can provide two main pieces of information:
		152	// 1. Progressive X obscurity.
		153	// 2. Recessive Y obscurity.
		154
		155	// Progressive X obscurity, favouring recessive input angle
		156	if (xi->xe > 0 && l.xo == 0)
		157	{
		158	l.xe = xi->xe - xi->yo;
		159	l.ye = xi->ye + xi->yo;
		160	l.xo = xi->xo;
		161	l.yo = xi->yo;
		162	}
		163
		164	// Recessive Y obscurity
		165	if (xi->ye <= 0 && xi->yo > 0 && xi->xe > 0)
		166	{
		167	l.ye = xi->yo + xi->ye;
		168	l.xe = xi->xe - xi->yo;
		169	l.xo = xi->xo;
		170	l.yo = xi->yo;
		171	}
298	}	172	}
299	}	173	}
		174
		175	// check contributing spaces, last vertical, identical structure
		176	if (expect_true (l.flags & LOS_YI))
		177	{
		178	los_info *yi = &los[x][y - sign (dy)];
		179
		180	// don't cull unless obscured
		181	l.culled &= !yi->visible;
		182
		183	/* merge input space */
		184	if (expect_false (yi->yo \|\| yi->xo))
		185	{
		186	// The Y input can provide two main pieces of information:
		187	// 1. Progressive Y obscurity.
		188	// 2. Recessive X obscurity.
		189
		190	// Progressive Y obscurity, favouring recessive input angle
		191	if (yi->ye > 0 && l.yo == 0)
		192	{
		193	l.ye = yi->ye - yi->xo;
		194	l.xe = yi->xe + yi->xo;
		195	l.yo = yi->yo;
		196	l.xo = yi->xo;
		197	}
		198
		199	// Recessive X obscurity
		200	if (yi->xe <= 0 && yi->xo > 0 && yi->ye > 0)
		201	{
		202	l.xe = yi->xo + yi->xe;
		203	l.ye = yi->ye - yi->xo;
		204	l.yo = yi->yo;
		205	l.xo = yi->xo;
		206	}
		207	}
		208	}
		209
		210	// check whether this space blocks the view
		211	maptile *m = pl->observe->map;
		212	sint16 nx = pl->observe->x + dx;
		213	sint16 ny = pl->observe->y + dy;
		214
		215	if (expect_true (!xy_normalise (m, nx, ny))
		216	\|\| expect_false (m->at (nx, ny).flags () & P_BLOCKSVIEW))
		217	{
		218	l.xo = l.xe = abs (dx);
		219	l.yo = l.ye = abs (dy);
		220
		221	// we obscure dependents, but might be visible
		222	// copy the los from the square towards the player,
		223	// so outward diagonal corners are lit.
		224	pl->los[x][y] = los[x - sign0 (dx)][y - sign0 (dy)].visible ? 0 : LOS_BLOCKED;
		225	l.visible = false;
		226	}
		227	else
		228	{
		229	// we are not blocked, so calculate visibility, by checking
		230	// whether we are inside or outside the shadow
		231	l.visible = (l.xe <= 0 \|\| l.xe > l.xo)
		232	&& (l.ye <= 0 \|\| l.ye > l.yo);
		233
		234	pl->los[x][y] = l.culled ? LOS_BLOCKED
		235	: l.visible ? max (0, 2 - max_radius + distance)
		236	: 3;
		237	}
		238
300	}	239	}
301		240
302	if (op->map->darkness > 0) /* player is on a dark map */	241	// Expands by the unit length in each component's current direction.
303	expand_lighted_sight (op);	242	// If a component has no direction, then it is expanded in both of its
304		243	// positive and negative directions.
305	/* clear mark squares */	244	if (!l.culled)
306	for (x = 0; x < op->contr->ns->mapx; x++)	245	{
307	for (y = 0; y < op->contr->ns->mapy; y++)	246	if (dx >= 0) enqueue (dx + 1, dy, LOS_XI);
308	if (op->contr->blocked_los[x][y] < 0)	247	if (dx <= 0) enqueue (dx - 1, dy, LOS_XI);
309	op->contr->blocked_los[x][y] = 0;	248	if (dy >= 0) enqueue (dx, dy + 1, LOS_YI);
		249	if (dy <= 0) enqueue (dx, dy - 1, LOS_YI);
		250	}
		251	}
310	}	252	}
311		253
312	/* returns true if op carries one or more lights	254	/* returns true if op carries one or more lights
313	* This is a trivial function now days, but it used to	255	* This is a trivial function now days, but it used to
314	* be a bit longer. Probably better for callers to just	256	* be a bit longer. Probably better for callers to just
315	* check the op->glow_radius instead of calling this.	257	* check the op->glow_radius instead of calling this.
316	*/	258	*/
317
318	int	259	int
319	has_carried_lights (const object *op)	260	has_carried_lights (const object *op)
320	{	261	{
321	/* op may glow! */	262	/* op may glow! */
322	if (op->glow_radius > 0)	263	if (op->glow_radius > 0)
323	return 1;	264	return 1;
324		265
325	return 0;	266	return 0;
326	}	267	}
327		268
		269	/* radius, distance => lightness adjust */
		270	static sint8 light_atten[MAX_LIGHT_RADIUS * 2 + 1][MAX_LIGHT_RADIUS * 3 / 2 + 1];
		271	static sint8 vision_atten[MAX_DARKNESS + 1][MAX_DARKNESS * 3 / 2 + 1];
		272
		273	static struct los_init
		274	{
		275	los_init ()
		276	{
		277	/* for lights */
		278	for (int radius = -MAX_LIGHT_RADIUS; radius <= MAX_LIGHT_RADIUS; ++radius)
		279	for (int distance = 0; distance <= MAX_LIGHT_RADIUS * 3 / 2; ++distance)
		280	{
		281	// max intensity
		282	int intensity = min (LOS_MAX, abs (radius) + 1);
		283
		284	// actual intensity
		285	intensity = max (0, lerp_rd (distance, 0, abs (radius) + 1, intensity, 0));
		286
		287	light_atten [radius + MAX_LIGHT_RADIUS][distance] = radius < 0
		288	? min (3, intensity)
		289	: LOS_MAX - intensity;
		290	}
		291
		292	/* for general vision */
		293	for (int radius = 0; radius <= MAX_DARKNESS; ++radius)
		294	for (int distance = 0; distance <= MAX_DARKNESS * 3 / 2; ++distance)
		295	{
		296	vision_atten [radius][distance] = distance <= radius ? 3 : 4;
		297	}
		298	}
		299	} los_init;
		300
		301	sint8
		302	los_brighten (sint8 b, sint8 l)
		303	{
		304	return b == LOS_BLOCKED ? b : min (b, l);
		305	}
		306
		307	sint8
		308	los_darken (sint8 b, sint8 l)
		309	{
		310	return max (b, l);
		311	}
		312
		313	template<sint8 change_it (sint8, sint8)>
328	static void	314	static void
329	expand_lighted_sight (object *op)	315	apply_light (player pl, int dx, int dy, int light, const sint8 atten_table)
330	{	316	{
331	int x, y, darklevel, ax, ay, basex, basey, mflags, light, x1, y1;	317	// min or max the circular area around basex, basey
332	maptile *m = op->map;	318	dx += LOS_X0;
333	sint16 nx, ny;	319	dy += LOS_Y0;
334		320
335	darklevel = m->darkness;	321	int hx = pl->ns->mapx / 2;
		322	int hy = pl->ns->mapy / 2;
		323
		324	int ax0 = max (LOS_X0 - hx, dx - light);
		325	int ay0 = max (LOS_Y0 - hy, dy - light);
		326	int ax1 = min (dx + light, LOS_X0 + hx);
		327	int ay1 = min (dy + light, LOS_Y0 + hy);
		328
		329	for (int ax = ax0; ax <= ax1; ax++)
		330	for (int ay = ay0; ay <= ay1; ay++)
		331	pl->los[ax][ay] =
		332	change_it (pl->los[ax][ay], atten_table [idistance (ax - dx, ay - dy)]);
		333	}
		334
		335	/* add light, by finding all (non-null) nearby light sources, then
		336	* mark those squares specially.
		337	*/
		338	static void
		339	apply_lights (player *pl)
		340	{
		341	object *op = pl->observe;
		342	int darklevel = op->map->darklevel ();
336		343
337	/* If the player can see in the dark, lower the darklevel for him */	344	/* If the player can see in the dark, lower the darklevel for him */
338	if (QUERY_FLAG (op, FLAG_SEE_IN_DARK))	345	if (op->flag [FLAG_SEE_IN_DARK])
339	darklevel -= 2;	346	darklevel = max (0, darklevel - 2);
340		347
341	/* add light, by finding all (non-null) nearby light sources, then	348	int half_x = pl->ns->mapx / 2;
342	* mark those squares specially. If the darklevel<1, there is no	349	int half_y = pl->ns->mapy / 2;
343	* reason to do this, so we skip this function
344	*/
345		350
		351	int min_x = op->x - half_x - MAX_LIGHT_RADIUS;
		352	int min_y = op->y - half_y - MAX_LIGHT_RADIUS;
		353	int max_x = op->x + half_x + MAX_LIGHT_RADIUS;
		354	int max_y = op->y + half_y + MAX_LIGHT_RADIUS;
		355
		356	int pass2 = 0; // negative lights have an extra pass
		357
346	if (darklevel < 1)	358	if (!darklevel)
347	return;	359	pass2 = 1;
348		360	else
349	/* Do a sanity check. If not valid, some code below may do odd
350	* things.
351	*/
352	if (darklevel > MAX_DARKNESS)
353	{	361	{
354	LOG (llevError, "Map darkness for %s on %s is too high (%d)\n", &op->name, &op->map->path, darklevel);	362	/* first, make everything totally dark */
355	darklevel = MAX_DARKNESS;	363	for (int dx = -half_x; dx <= half_x; dx++)
		364	for (int dy = -half_x; dy <= half_y; dy++)
		365	if (pl->los[dx + LOS_X0][dy + LOS_Y0] != LOS_BLOCKED)
		366	pl->los[dx + LOS_X0][dy + LOS_Y0] = LOS_MAX;
		367
		368	/*
		369	* Only process the area of interest.
		370	* the basex, basey values represent the position in the op->contr->los
		371	* array. Its easier to just increment them here (and start with the right
		372	* value) than to recalculate them down below.
		373	*/
		374	for (int x = min_x; x <= max_x; x++)
		375	for (int y = min_y; y <= max_y; y++)
		376	{
		377	maptile *m = pl->observe->map;
		378	sint16 nx = x;
		379	sint16 ny = y;
		380
		381	if (!xy_normalise (m, nx, ny))
		382	continue;
		383
		384	mapspace &ms = m->at (nx, ny);
		385	ms.update ();
		386	sint8 light = ms.light;
		387
		388	if (expect_false (light))
		389	if (light < 0)
		390	pass2 = 1;
		391	else
		392	apply_light<los_brighten> (pl, x - op->x, y - op->y, light, light_atten [light + MAX_LIGHT_RADIUS]);
		393	}
		394
		395	/* grant some vision to the player, based on the darklevel */
		396	{
		397	int light = clamp (MAX_DARKNESS - darklevel, 0, MAX_DARKNESS);
		398
		399	apply_light<los_brighten> (pl, 0, 0, light, vision_atten [light]);
		400	}
356	}	401	}
357		402
358	/* First, limit player furthest (unlighted) vision */	403	// possibly do 2nd pass for rare negative glow radii
359	for (x = 0; x < op->contr->ns->mapx; x++)	404	// for effect, those are always considered to be stronger than anything else
360	for (y = 0; y < op->contr->ns->mapy; y++)	405	// but they can't darken a place completely
361	if (op->contr->blocked_los[x][y] != 100)	406	if (pass2)
362	op->contr->blocked_los[x][y] = MAX_LIGHT_RADII;	407	for (int x = min_x; x <= max_x; x++)
363		408	for (int y = min_y; y <= max_y; y++)
364	/* the spaces[] darkness value contains the information we need.
365	* Only process the area of interest.
366	* the basex, basey values represent the position in the op->contr->blocked_los
367	* array. Its easier to just increment them here (and start with the right
368	* value) than to recalculate them down below.
369	*/
370	for (x = (op->x - op->contr->ns->mapx / 2 - MAX_LIGHT_RADII), basex = -MAX_LIGHT_RADII;
371	x <= (op->x + op->contr->ns->mapx / 2 + MAX_LIGHT_RADII); x++, basex++)
372	{
373
374	for (y = (op->y - op->contr->ns->mapy / 2 - MAX_LIGHT_RADII), basey = -MAX_LIGHT_RADII;
375	y <= (op->y + op->contr->ns->mapy / 2 + MAX_LIGHT_RADII); y++, basey++)
376	{	409	{
377	m = op->map;	410	maptile *m = pl->observe->map;
378	nx = x;	411	sint16 nx = x;
379	ny = y;	412	sint16 ny = y;
380		413
381	mflags = get_map_flags (m, &m, nx, ny, &nx, &ny);	414	if (!xy_normalise (m, nx, ny))
382
383	if (mflags & P_OUT_OF_MAP)
384	continue;	415	continue;
385		416
386	/* This space is providing light, so we need to brighten up the	417	mapspace &ms = m->at (nx, ny);
387	* spaces around here.	418	ms.update ();
388	*/	419	sint8 light = ms.light;
389	light = GET_MAP_LIGHT (m, nx, ny);
390	if (light != 0)
391	{
392	#if 0
393	LOG (llevDebug, "expand_lighted_sight: Found light at x=%d, y=%d, basex=%d, basey=%d\n", x, y, basex, basey);
394	#endif
395	for (ax = basex - light; ax <= basex + light; ax++)
396	{
397	if (ax < 0 \|\| ax >= op->contr->ns->mapx)
398	continue;
399		420
400	for (ay = basey - light; ay <= basey + light; ay++)	421	if (expect_false (light < 0))
401	{	422	apply_light<los_darken> (pl, x - op->x, y - op->y, -light, light_atten [light + MAX_LIGHT_RADIUS]);
402	if (ay < 0 \|\| ay >= op->contr->ns->mapy)
403	continue;
404
405	/* If the space is fully blocked, do nothing. Otherwise, we
406	* brighten the space. The further the light is away from the
407	* source (basex-x), the less effect it has. Though light used
408	* to dim in a square manner, it now dims in a circular manner
409	* using the the pythagorean theorem. glow_radius still
410	* represents the radius
411	*/
412	if (op->contr->blocked_los[ax][ay] != 100)
413	{
414	x1 = abs (basex - ax) * abs (basex - ax);
415	y1 = abs (basey - ay) * abs (basey - ay);
416
417	if (light > 0) op->contr->blocked_los[ax][ay] -= max (light - isqrt (x1 + y1), 0);
418	if (light < 0) op->contr->blocked_los[ax][ay] -= min (light + isqrt (x1 + y1), 0);
419	}
420	}
421	}
422	}
423	}
424	}
425
426	/* Outdoor should never really be completely pitch black dark like
427	* a dungeon, so let the player at least see a little around themselves
428	*/
429	if (op->map->outdoor && darklevel > (MAX_DARKNESS - 3))
430	{
431	if (op->contr->blocked_los[op->contr->ns->mapx / 2][op->contr->ns->mapy / 2] > (MAX_DARKNESS - 3))
432	op->contr->blocked_los[op->contr->ns->mapx / 2][op->contr->ns->mapy / 2] = MAX_DARKNESS - 3;
433
434	for (x = -1; x <= 1; x++)
435	for (y = -1; y <= 1; y++)
436	{
437	if (op->contr->blocked_los[x + op->contr->ns->mapx / 2][y + op->contr->ns->mapy / 2] > (MAX_DARKNESS - 2))
438	op->contr->blocked_los[x + op->contr->ns->mapx / 2][y + op->contr->ns->mapy / 2] = MAX_DARKNESS - 2;
439	}	423	}
440	}
441
442	/* grant some vision to the player, based on the darklevel */
443	for (x = darklevel - MAX_DARKNESS; x < MAX_DARKNESS + 1 - darklevel; x++)
444	for (y = darklevel - MAX_DARKNESS; y < MAX_DARKNESS + 1 - darklevel; y++)
445	if (!(op->contr->blocked_los[x + op->contr->ns->mapx / 2][y + op->contr->ns->mapy / 2] == 100))
446	op->contr->blocked_los[x + op->contr->ns->mapx / 2][y + op->contr->ns->mapy / 2] -=
447	MAX (0, 6 - darklevel - MAX (abs (x), abs (y)));
448	}	424	}
449		425
450	/* blinded_sight() - sets all veiwable squares to blocked except	426	/* blinded_sight() - sets all viewable squares to blocked except
451	* for the one the central one that the player occupies. A little	427	* for the one the central one that the player occupies. A little
452	* odd that you can see yourself (and what your standing on), but	428	* odd that you can see yourself (and what your standing on), but
453	* really need for any reasonable game play.	429	* really need for any reasonable game play.
454	*/	430	*/
455	static void	431	static void
456	blinded_sight (object *op)	432	blinded_sight (player *pl)
457	{	433	{
458	int x, y;	434	pl->los[LOS_X0][LOS_Y0] = 1;
459
460	for (x = 0; x < op->contr->ns->mapx; x++)
461	for (y = 0; y < op->contr->ns->mapy; y++)
462	op->contr->blocked_los[x][y] = 100;
463
464	op->contr->blocked_los[op->contr->ns->mapx / 2][op->contr->ns->mapy / 2] = 0;
465	}	435	}
466		436
467	/*	437	/*
468	* update_los() recalculates the array which specifies what is	438	* update_los() recalculates the array which specifies what is
469	* visible for the given player-object.	439	* visible for the given player-object.
470	*/	440	*/
471
472	void	441	void
473	update_los (object *op)	442	player::update_los ()
474	{	443	{
475	int dx = op->contr->ns->mapx / 2, dy = op->contr->ns->mapy / 2, x, y;	444	if (ob->flag [FLAG_REMOVED])//D really needed?
476
477	if (QUERY_FLAG (op, FLAG_REMOVED))
478	return;	445	return;
479		446
480	clear_los (op);	447	clear_los ();
481	if (QUERY_FLAG (op, FLAG_WIZ) /* \|\|XRAYS(op) */ )
482	return;
483		448
484	/* For larger maps, this is more efficient than the old way which	449	if (ob->flag [FLAG_WIZLOOK])
485	* used the chaining of the block array. Since many space views could	450	memset (los, 0, sizeof (los));
486	* be blocked by different spaces in front, this mean that a lot of spaces	451	else if (observe->flag [FLAG_BLIND]) /* player is blind */
487	* could be examined multile times, as each path would be looked at.
488	*/
489	for (x = (MAP_CLIENT_X - op->contr->ns->mapx) / 2 - 1; x < (MAP_CLIENT_X + op->contr->ns->mapx) / 2 + 1; x++)
490	for (y = (MAP_CLIENT_Y - op->contr->ns->mapy) / 2 - 1; y < (MAP_CLIENT_Y + op->contr->ns->mapy) / 2 + 1; y++)
491	check_wall (op, x, y);
492
493	/* do the los of the player. 3 (potential) cases */
494	if (QUERY_FLAG (op, FLAG_BLIND)) /* player is blind */
495	blinded_sight (op);	452	blinded_sight (this);
496	else	453	else
497	expand_sight (op);	454	{
		455	calculate_los (this);
		456	apply_lights (this);
		457	}
498		458
499	//TODO: no range-checking whatsoever :(	459	if (observe->flag [FLAG_XRAYS])
500	if (QUERY_FLAG (op, FLAG_XRAYS))
501	for (int x = -2; x <= 2; x++)	460	for (int dx = -2; dx <= 2; dx++)
502	for (int y = -2; y <= 2; y++)	461	for (int dy = -2; dy <= 2; dy++)
503	op->contr->blocked_los[dx + x][dy + y] = 0;	462	min_it (los[dx + LOS_X0][dy + LOS_X0], 1);
504	}	463	}
505		464
506	/* update all_map_los is like update_all_los below,	465	/* update all_map_los is like update_all_los below,
507	* but updates everyone on the map, no matter where they	466	* but updates everyone on the map, no matter where they
508	* are. This generally should not be used, as a per	467	* are. This generally should not be used, as a per
515	* change_map_light function	474	* change_map_light function
516	*/	475	*/
517	void	476	void
518	update_all_map_los (maptile *map)	477	update_all_map_los (maptile *map)
519	{	478	{
520	for_all_players (pl)	479	for_all_players_on_map (pl, map)
521	if (pl->ob && pl->ob->map == map)
522	pl->do_los = 1;	480	pl->do_los = 1;
523	}	481	}
524		482
525	/*	483	/*
526	* This function makes sure that update_los() will be called for all	484	* This function makes sure that update_los() will be called for all
527	* players on the given map within the next frame.	485	* players on the given map within the next frame.
…		…
535	* map is the map that changed, x and y are the coordinates.	493	* map is the map that changed, x and y are the coordinates.
536	*/	494	*/
537	void	495	void
538	update_all_los (const maptile *map, int x, int y)	496	update_all_los (const maptile *map, int x, int y)
539	{	497	{
		498	map->at (x, y).invalidate ();
		499
540	for_all_players (pl)	500	for_all_players (pl)
541	{	501	{
542	/* Player should not have a null map, but do this	502	/* Player should not have a null map, but do this
543	* check as a safety	503	* check as a safety
544	*/	504	*/
…		…
596	pl->do_los = 1;	556	pl->do_los = 1;
597	}	557	}
598	}	558	}
599	}	559	}
600		560
		561	static const int season_darkness[5][HOURS_PER_DAY] = {
		562	/0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 /
		563	{ 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 1, 2, 2, 2, 3, 3, 4, 4, 5 },
		564	{ 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4 },
		565	{ 5, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 4, 4 },
		566	{ 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 4 },
		567	{ 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4 }
		568	};
		569
601	/*	570	/*
602	* Debug-routine which dumps the array which specifies the visible	571	* Tell players the time and compute the darkness level for all maps in the game.
603	* area of a player. Triggered by the z key in DM mode.	572	* MUST be called exactly once per hour.
604	*/	573	*/
605	void	574	void
606	print_los (object *op)	575	maptile::adjust_daylight ()
607	{	576	{
608	int x, y;	577	timeofday_t tod;
609	char buf[50], buf2[10];
610		578
611	strcpy (buf, " ");	579	get_tod (&tod);
612		580
613	for (x = 0; x < op->contr->ns->mapx; x++)	581	// log the time to log-1 every hour, and to chat every day
614	{	582	{
615	sprintf (buf2, "%2d", x);	583	char todbuf[512];
616	strcat (buf, buf2);	584
		585	format_tod (todbuf, sizeof (todbuf), &tod);
		586
		587	for_all_players (pl)
		588	pl->ns->send_msg (NDI_GREY, tod.hour == 15 ? CHAT_CHANNEL : LOG_CHANNEL, todbuf);
617	}	589	}
618		590
619	new_draw_info (NDI_UNIQUE, 0, op, buf);	591	/* If the light level isn't changing, no reason to do all
		592	* the work below.
		593	*/
		594	sint8 new_darkness = season_darkness[tod.season][tod.hour];
620		595
621	for (y = 0; y < op->contr->ns->mapy; y++)	596	if (new_darkness == maptile::outdoor_darkness)
622	{	597	return;
623	sprintf (buf, "%2d:", y);
624		598
625	for (x = 0; x < op->contr->ns->mapx; x++)	599	new_draw_info (NDI_GREY \| NDI_UNIQUE \| NDI_ALL, 1, 0,
626	{	600	new_darkness > maptile::outdoor_darkness
627	sprintf (buf2, " %1d", op->contr->blocked_los[x][y]);	601	? "It becomes darker."
628	strcat (buf, buf2);	602	: "It becomes brighter.");
629	}
630		603
631	new_draw_info (NDI_UNIQUE, 0, op, buf);	604	maptile::outdoor_darkness = new_darkness;
632	}	605
		606	// we simply update the los for all players, which is unnecessarily
		607	// costly, but should do for the moment.
		608	for_all_players (pl)
		609	pl->do_los = 1;
633	}	610	}
634		611
635	/*	612	/*
636	* make_sure_seen: The object is supposed to be visible through walls, thus	613	* make_sure_seen: The object is supposed to be visible through walls, thus
637	* check if any players are nearby, and edit their LOS array.	614	* check if any players are nearby, and edit their LOS array.
638	*/	615	*/
639
640	void	616	void
641	make_sure_seen (const object *op)	617	make_sure_seen (const object *op)
642	{	618	{
643	for_all_players (pl)	619	for_all_players (pl)
644	if (pl->ob->map == op->map &&	620	if (pl->ob->map == op->map &&
645	pl->ob->y - pl->ns->mapy / 2 <= op->y &&	621	pl->ob->y - pl->ns->mapy / 2 <= op->y &&
646	pl->ob->y + pl->ns->mapy / 2 >= op->y && pl->ob->x - pl->ns->mapx / 2 <= op->x && pl->ob->x + pl->ns->mapx / 2 >= op->x)	622	pl->ob->y + pl->ns->mapy / 2 >= op->y && pl->ob->x - pl->ns->mapx / 2 <= op->x && pl->ob->x + pl->ns->mapx / 2 >= op->x)
647	pl->blocked_los[pl->ns->mapx / 2 + op->x - pl->ob->x][pl->ns->mapy / 2 + op->y - pl->ob->y] = 0;	623	pl->los[op->x - pl->ob->x + LOS_X0][op->y - pl->ob->y + LOS_X0] = 0;
648	}	624	}
649		625
650	/*	626	/*
651	* make_sure_not_seen: The object which is supposed to be visible through	627	* make_sure_not_seen: The object which is supposed to be visible through
652	* walls has just been removed from the map, so update the los of any	628	* walls has just been removed from the map, so update the los of any
653	* players within its range	629	* players within its range
654	*/	630	*/
655
656	void	631	void
657	make_sure_not_seen (const object *op)	632	make_sure_not_seen (const object *op)
658	{	633	{
659	for_all_players (pl)	634	for_all_players (pl)
660	if (pl->ob->map == op->map &&	635	if (pl->ob->map == op->map &&

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Comparing deliantra/server/common/los.C (file contents): Revision 1.23 by root, Fri Feb 16 22:21:45 2007 UTC vs. Revision 1.48 by root, Tue Dec 23 06:58:23 2008 UTC

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Comparing deliantra/server/common/los.C (file contents):
Revision 1.23 by root, Fri Feb 16 22:21:45 2007 UTC vs.
Revision 1.48 by root, Tue Dec 23 06:58:23 2008 UTC