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

Comparing deliantra/server/common/los.C (file contents):
Revision 1.17 by root, Sun Jan 7 02:39:13 2007 UTC vs.
Revision 1.45 by root, Sun Dec 21 23:29:27 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.	20	*
21		21	* The authors can be reached via e-mail to <support@deliantra.net>
22	The authors can be reached via e-mail at <crossfire@schmorp.de>
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	blocks block[MAP_CLIENT_X][MAP_CLIENT_Y];
47		28
48	static void expand_lighted_sight (object *op);	29	static void expand_lighted_sight (object *op);
49		30
50	/*	31	enum {
51	* Used to initialise the array used by the LOS routines.	32	LOS_XI = 0x01,
52	* What this sets if that x,y blocks the view of bx,by	33	LOS_YI = 0x02,
53	* This then sets up a relation - for example, something	34	};
54	* at 5,4 blocks view at 5,3 which blocks view at 5,2
55	* etc. So when we check 5,4 and find it block, we have
56	* the data to know that 5,3 and 5,2 and 5,1 should also
57	* be blocked.
58	*/
59		35
60	static void	36	struct los_info
61	set_block (int x, int y, int bx, int by)
62	{	37	{
63	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	};
64		45
65	/* Due to flipping, we may get duplicates - better safe than sorry.	46	// temporary storage for the los algorithm,
66	*/	47	// one los_info for each lightable map space
67	for (i = 0; i < index; i++)	48	static los_info los[MAP_CLIENT_X][MAP_CLIENT_Y];
68	{
69	if (block[x][y].x[i] == bx && block[x][y].y[i] == by)
70	return;
71	}
72		49
73	block[x][y].x[index] = bx;	50	struct point
74	block[x][y].y[index] = by;
75	block[x][y].index++;
76	#ifdef LOS_DEBUG
77	LOG (llevDebug, "setblock: added %d %d -> %d %d (%d)\n", x, y, bx, by, block[x][y].index);
78	#endif
79	}
80
81	/*
82	* initialises the array used by the LOS routines.
83	*/
84
85	/* since we are only doing the upper left quadrant, only
86	* these spaces could possibly get blocked, since these
87	* are the only ones further out that are still possibly in the
88	* sightline.
89	*/
90
91	void
92	init_block (void)
93	{	51	{
94	int x, y, dx, dy, i;
95	static int block_x[3] = { -1, -1, 0 }, block_y[3] =
96	{
97	-1, 0, -1};
98
99	for (x = 0; x < MAP_CLIENT_X; x++)
100	for (y = 0; y < MAP_CLIENT_Y; y++)
101	{
102	block[x][y].index = 0;
103	}
104
105
106	/* The table should be symmetric, so only do the upper left
107	* quadrant - makes the processing easier.
108	*/
109	for (x = 1; x <= MAP_CLIENT_X / 2; x++)
110	{
111	for (y = 1; y <= MAP_CLIENT_Y / 2; y++)
112	{
113	for (i = 0; i < 3; i++)
114	{
115	dx = x + block_x[i];
116	dy = y + block_y[i];
117
118	/* center space never blocks */
119	if (x == MAP_CLIENT_X / 2 && y == MAP_CLIENT_Y / 2)
120	continue;
121
122	/* If its a straight line, its blocked */
123	if ((dx == x && x == MAP_CLIENT_X / 2) \|\| (dy == y && y == MAP_CLIENT_Y / 2))
124	{
125	/* For simplicity, we mirror the coordinates to block the other
126	* quadrants.
127	*/
128	set_block (x, y, dx, dy);
129	if (x == MAP_CLIENT_X / 2)
130	{
131	set_block (x, MAP_CLIENT_Y - y - 1, dx, MAP_CLIENT_Y - dy - 1);
132	}
133	else if (y == MAP_CLIENT_Y / 2)
134	{
135	set_block (MAP_CLIENT_X - x - 1, y, MAP_CLIENT_X - dx - 1, dy);
136	}
137	}
138	else
139	{
140	float d1, r, s, l;
141
142	/* We use the algorihm that found out how close the point
143	* (x,y) is to the line from dx,dy to the center of the viewable
144	* area. l is the distance from x,y to the line.
145	* r is more a curiosity - it lets us know what direction (left/right)
146	* the line is off
147	*/
148
149	d1 = (float) (pow (MAP_CLIENT_X / 2 - dx, 2.f) + pow (MAP_CLIENT_Y / 2 - dy, 2.f));
150	r = (float) ((dy - y) * (dy - MAP_CLIENT_Y / 2) - (dx - x) * (MAP_CLIENT_X / 2 - dx)) / d1;
151	s = (float) ((dy - y) * (MAP_CLIENT_X / 2 - dx) - (dx - x) * (MAP_CLIENT_Y / 2 - dy)) / d1;
152	l = FABS (sqrt (d1) * s);
153
154	if (l <= SPACE_BLOCK)
155	{
156	/* For simplicity, we mirror the coordinates to block the other
157	* quadrants.
158	*/
159	set_block (x, y, dx, dy);
160	set_block (MAP_CLIENT_X - x - 1, y, MAP_CLIENT_X - dx - 1, dy);
161	set_block (x, MAP_CLIENT_Y - y - 1, dx, MAP_CLIENT_Y - dy - 1);
162	set_block (MAP_CLIENT_X - x - 1, MAP_CLIENT_Y - y - 1, MAP_CLIENT_X - dx - 1, MAP_CLIENT_Y - dy - 1);
163	}
164	}
165	}
166	}
167	}
168	}
169
170	/*
171	* Used to initialise the array used by the LOS routines.
172	* x,y are indexes into the blocked[][] array.
173	* This recursively sets the blocked line of sight view.
174	* From the blocked[][] array, we know for example
175	* that if some particular space is blocked, it blocks
176	* the view of the spaces 'behind' it, and those blocked
177	* spaces behind it may block other spaces, etc.
178	* In this way, the chain of visibility is set.
179	*/
180
181	static void
182	set_wall (object *op, int x, int y)
183	{
184	int i;
185
186	for (i = 0; i < block[x][y].index; i++)
187	{
188	int dx = block[x][y].x[i], dy = block[x][y].y[i], ax, ay;
189
190	/* ax, ay are the values as adjusted to be in the
191	* socket look structure.
192	*/
193	ax = dx - (MAP_CLIENT_X - op->contr->ns->mapx) / 2;
194	ay = dy - (MAP_CLIENT_Y - op->contr->ns->mapy) / 2;
195
196	if (ax < 0 \|\| ax >= op->contr->ns->mapx \|\| ay < 0 \|\| ay >= op->contr->ns->mapy)
197	continue;
198	#if 0
199	LOG (llevDebug, "blocked %d %d -> %d %d\n", dx, dy, ax, ay);
200	#endif
201	/* we need to adjust to the fact that the socket
202	* code wants the los to start from the 0,0
203	* and not be relative to middle of los array.
204	*/
205	op->contr->blocked_los[ax][ay] = 100;
206	set_wall (op, dx, dy);
207	}
208	}
209
210	/*
211	* Used to initialise the array used by the LOS routines.
212	* op is the object, x and y values based on MAP_CLIENT_X and Y.
213	* this is because they index the blocked[][] arrays.
214	*/
215
216	static void
217	check_wall (object *op, int x, int y)
218	{
219	int ax, ay;	52	sint8 x, y;
		53	};
220		54
221	if (!block[x][y].index)	55	// minimum size, but must be a power of two
222	return;	56	#define QUEUE_LENGTH ((MAP_CLIENT_X + MAP_CLIENT_Y) * 2)
223		57
224	/* ax, ay are coordinates as indexed into the look window */	58	// a queue of spaces to calculate
225	ax = x - (MAP_CLIENT_X - op->contr->ns->mapx) / 2;	59	static point queue [QUEUE_LENGTH];
226	ay = y - (MAP_CLIENT_Y - op->contr->ns->mapy) / 2;	60	static int q1, q2; // queue start, end
227
228	/* If the converted coordinates are outside the viewable
229	* area for the client, return now.
230	*/
231	if (ax < 0 \|\| ay < 0 \|\| ax >= op->contr->ns->mapx \|\| ay >= op->contr->ns->mapy)
232	return;
233
234	#if 0
235	LOG (llevDebug, "check_wall, ax,ay=%d, %d x,y = %d, %d blocksview = %d, %d\n",
236	ax, ay, x, y, op->x + x - MAP_CLIENT_X / 2, op->y + y - MAP_CLIENT_Y / 2);
237	#endif
238
239	/* If this space is already blocked, prune the processing - presumably
240	* whatever has set this space to be blocked has done the work and already
241	* done the dependency chain.
242	*/
243	if (op->contr->blocked_los[ax][ay] == 100)
244	return;
245
246
247	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))
248	set_wall (op, x, y);
249	}
250		61
251	/*	62	/*
252	* Clears/initialises the los-array associated to the player	63	* Clears/initialises the los-array associated to the player
253	* controlling the object.	64	* controlling the object.
254	*/	65	*/
255
256	void	66	void
257	clear_los (object *op)	67	player::clear_los (sint8 value)
258	{	68	{
259	/* This is safer than using the ns->mapx, mapy because	69	memset (los, value, sizeof (los));
260	* we index the blocked_los as a 2 way array, so clearing
261	* the first z spaces may not not cover the spaces we are
262	* actually going to use
263	*/
264	(void) memset ((void ) op->contr->blocked_los, 0, MAP_CLIENT_X MAP_CLIENT_Y);
265	}	70	}
266		71
267	/*	72	// enqueue a single mapspace, but only if it hasn't
268	* expand_sight goes through the array of what the given player is	73	// been enqueued yet.
269	* able to see, and expands the visible area a bit, so the player will,
270	* to a certain degree, be able to see into corners.
271	* This is somewhat suboptimal, would be better to improve the formula.
272	*/
273
274	static void	74	static void
275	expand_sight (object *op)	75	enqueue (sint8 dx, sint8 dy, uint8 flags = 0)
276	{	76	{
277	int i, x, y, dx, dy;	77	sint8 x = LOS_X0 + dx;
		78	sint8 y = LOS_Y0 + dy;
278		79
279	for (x = 1; x < op->contr->ns->mapx - 1; x++) /* loop over inner squares */	80	if (x < 0 \|\| x >= MAP_CLIENT_X) return;
280	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	do_los (object *op)
		105	{
		106	player *pl = op->contr;
		107
		108	int max_radius = max (pl->ns->mapx, pl->ns->mapy) / 2;
		109
		110	memset (los, 0, sizeof (los));
		111
		112	q1 = 0; q2 = 0; // initialise queue, not strictly required
		113	enqueue (0, 0); // enqueue center
		114
		115	// treat the origin specially
		116	los[LOS_X0][LOS_Y0].visible = 1;
		117	pl->los[LOS_X0][LOS_Y0] = 0;
		118
		119	// loop over all enqueued points until the queue is empty
		120	// the order in which this is done ensures that we
		121	// never touch a mapspace whose input spaces we haven't checked
		122	// yet.
		123	while (q1 != q2)
		124	{
		125	sint8 dx = queue[q2].x;
		126	sint8 dy = queue[q2].y;
		127
		128	q2 = (q2 + 1) & (QUEUE_LENGTH - 1);
		129
		130	sint8 x = LOS_X0 + dx;
		131	sint8 y = LOS_Y0 + dy;
		132
		133	//int distance = idistance (dx, dy); if (distance > max_radius) continue;//D
		134	int distance = 0;//D
		135
		136	los_info &l = los[x][y];
		137
		138	if (expect_true (l.flags & (LOS_XI \| LOS_YI)))
281	{	139	{
282	if (!op->contr->blocked_los[x][y] &&	140	l.culled = 1;
283	!(get_map_flags (op->map, NULL,	141
284	op->x - op->contr->ns->mapx / 2 + x,	142	// check contributing spaces, first horizontal
285	op->y - op->contr->ns->mapy / 2 + y, NULL, NULL) & (P_BLOCKSVIEW \| P_OUT_OF_MAP)))	143	if (expect_true (l.flags & LOS_XI))
286	{	144	{
		145	los_info *xi = &los[x - sign (dx)][y];
287		146
288	for (i = 1; i <= 8; i += 1)	147	// don't cull unless obscured
289	{ /* mark all directions */	148	l.culled &= !xi->visible;
290	dx = x + freearr_x[i];	149
291	dy = y + freearr_y[i];	150	/* merge input space */
292	if (op->contr->blocked_los[dx][dy] > 0) /* for any square blocked */	151	if (expect_false (xi->xo \|\| xi->yo))
293	op->contr->blocked_los[dx][dy] = -1;	152	{
		153	// The X input can provide two main pieces of information:
		154	// 1. Progressive X obscurity.
		155	// 2. Recessive Y obscurity.
		156
		157	// Progressive X obscurity, favouring recessive input angle
		158	if (xi->xe > 0 && l.xo == 0)
		159	{
		160	l.xe = xi->xe - xi->yo;
		161	l.ye = xi->ye + xi->yo;
		162	l.xo = xi->xo;
		163	l.yo = xi->yo;
		164	}
		165
		166	// Recessive Y obscurity
		167	if (xi->ye <= 0 && xi->yo > 0 && xi->xe > 0)
		168	{
		169	l.ye = xi->yo + xi->ye;
		170	l.xe = xi->xe - xi->yo;
		171	l.xo = xi->xo;
		172	l.yo = xi->yo;
		173	}
294	}	174	}
295	}	175	}
		176
		177	// check contributing spaces, last vertical, identical structure
		178	if (expect_true (l.flags & LOS_YI))
		179	{
		180	los_info *yi = &los[x][y - sign (dy)];
		181
		182	// don't cull unless obscured
		183	l.culled &= !yi->visible;
		184
		185	/* merge input space */
		186	if (expect_false (yi->yo \|\| yi->xo))
		187	{
		188	// The Y input can provide two main pieces of information:
		189	// 1. Progressive Y obscurity.
		190	// 2. Recessive X obscurity.
		191
		192	// Progressive Y obscurity, favouring recessive input angle
		193	if (yi->ye > 0 && l.yo == 0)
		194	{
		195	l.ye = yi->ye - yi->xo;
		196	l.xe = yi->xe + yi->xo;
		197	l.yo = yi->yo;
		198	l.xo = yi->xo;
		199	}
		200
		201	// Recessive X obscurity
		202	if (yi->xe <= 0 && yi->xo > 0 && yi->ye > 0)
		203	{
		204	l.xe = yi->xo + yi->xe;
		205	l.ye = yi->ye - yi->xo;
		206	l.yo = yi->yo;
		207	l.xo = yi->xo;
		208	}
		209	}
		210	}
		211
		212	// check whether this space blocks the view
		213	maptile *m = op->map;
		214	sint16 nx = op->x + dx;
		215	sint16 ny = op->y + dy;
		216
		217	if (expect_true (!xy_normalise (m, nx, ny))
		218	\|\| expect_false (m->at (nx, ny).flags () & P_BLOCKSVIEW))
		219	{
		220	l.xo = l.xe = abs (dx);
		221	l.yo = l.ye = abs (dy);
		222
		223	// we obscure dependents, but might be visible
		224	// copy the los from the square towards the player,
		225	// so outward diagonal corners are lit.
		226	pl->los[x][y] = los[x - sign0 (dx)][y - sign0 (dy)].visible ? 0 : LOS_BLOCKED;
		227	l.visible = false;
		228	}
		229	else
		230	{
		231	// we are not blocked, so calculate visibility, by checking
		232	// whether we are inside or outside the shadow
		233	l.visible = (l.xe <= 0 \|\| l.xe > l.xo)
		234	&& (l.ye <= 0 \|\| l.ye > l.yo);
		235
		236	pl->los[x][y] = l.culled ? LOS_BLOCKED
		237	: l.visible ? max (0, 2 - max_radius + distance)
		238	: 3;
		239	}
		240
296	}	241	}
297		242
298	if (op->map->darkness > 0) /* player is on a dark map */	243	// Expands by the unit length in each component's current direction.
299	expand_lighted_sight (op);	244	// If a component has no direction, then it is expanded in both of its
300		245	// positive and negative directions.
301		246	if (!l.culled)
302	/* clear mark squares */	247	{
303	for (x = 0; x < op->contr->ns->mapx; x++)	248	if (dx >= 0) enqueue (dx + 1, dy, LOS_XI);
304	for (y = 0; y < op->contr->ns->mapy; y++)	249	if (dx <= 0) enqueue (dx - 1, dy, LOS_XI);
305	if (op->contr->blocked_los[x][y] < 0)	250	if (dy >= 0) enqueue (dx, dy + 1, LOS_YI);
306	op->contr->blocked_los[x][y] = 0;	251	if (dy <= 0) enqueue (dx, dy - 1, LOS_YI);
		252	}
		253	}
307	}	254	}
308
309
310
311		255
312	/* returns true if op carries one or more lights	256	/* returns true if op carries one or more lights
313	* This is a trivial function now days, but it used to	257	* This is a trivial function now days, but it used to
314	* be a bit longer. Probably better for callers to just	258	* be a bit longer. Probably better for callers to just
315	* check the op->glow_radius instead of calling this.	259	* check the op->glow_radius instead of calling this.
316	*/	260	*/
317
318	int	261	int
319	has_carried_lights (const object *op)	262	has_carried_lights (const object *op)
320	{	263	{
321	/* op may glow! */	264	/* op may glow! */
322	if (op->glow_radius > 0)	265	if (op->glow_radius > 0)
323	return 1;	266	return 1;
324		267
325	return 0;	268	return 0;
326	}	269	}
327		270
		271	/* radius, distance => lightness adjust */
		272	static sint8 light_atten[MAX_LIGHT_RADIUS * 2 + 1][MAX_LIGHT_RADIUS * 3 / 2 + 1];
		273	static sint8 vision_atten[MAX_DARKNESS + 1][MAX_DARKNESS * 3 / 2 + 1];
		274
		275	static struct los_init
		276	{
		277	los_init ()
		278	{
		279	/* for lights */
		280	for (int radius = -MAX_LIGHT_RADIUS; radius <= MAX_LIGHT_RADIUS; ++radius)
		281	for (int distance = 0; distance <= MAX_LIGHT_RADIUS * 3 / 2; ++distance)
		282	{
		283	// max intensity
		284	int intensity = min (LOS_MAX, abs (radius) + 1);
		285
		286	// actual intensity
		287	intensity = max (0, lerp_rd (distance, 0, abs (radius) + 1, intensity, 0));
		288
		289	light_atten [radius + MAX_LIGHT_RADIUS][distance] = radius < 0
		290	? min (3, intensity)
		291	: LOS_MAX - intensity;
		292	}
		293
		294	/* for general vision */
		295	for (int radius = 0; radius <= MAX_DARKNESS; ++radius)
		296	for (int distance = 0; distance <= MAX_DARKNESS * 3 / 2; ++distance)
		297	{
		298	vision_atten [radius][distance] = distance <= radius ? 3 : 4;
		299	}
		300	}
		301	} los_init;
		302
		303	sint8
		304	los_brighten (sint8 b, sint8 l)
		305	{
		306	return b == LOS_BLOCKED ? b : min (b, l);
		307	}
		308
		309	sint8
		310	los_darken (sint8 b, sint8 l)
		311	{
		312	return max (b, l);
		313	}
		314
		315	template<sint8 change_it (sint8, sint8)>
328	static void	316	static void
329	expand_lighted_sight (object *op)	317	apply_light (object op, int dx, int dy, int light, const sint8 atten_table)
330	{	318	{
331	int x, y, darklevel, ax, ay, basex, basey, mflags, light, x1, y1;	319	// min or max the circular area around basex, basey
		320	player *pl = op->contr;
		321
		322	dx += LOS_X0;
		323	dy += LOS_Y0;
		324
		325	int hx = op->contr->ns->mapx / 2;
		326	int hy = op->contr->ns->mapy / 2;
		327
		328	int ax0 = max (LOS_X0 - hx, dx - light);
		329	int ay0 = max (LOS_Y0 - hy, dy - light);
		330	int ax1 = min (dx + light, LOS_X0 + hx);
		331	int ay1 = min (dy + light, LOS_Y0 + hy);
		332
		333	for (int ax = ax0; ax <= ax1; ax++)
		334	for (int ay = ay0; ay <= ay1; ay++)
		335	pl->los[ax][ay] =
		336	change_it (pl->los[ax][ay], atten_table [idistance (ax - dx, ay - dy)]);
		337	}
		338
		339	/* add light, by finding all (non-null) nearby light sources, then
		340	* mark those squares specially.
		341	*/
		342	static void
		343	apply_lights (object *op)
		344	{
		345	int darklevel, mflags, light, x1, y1;
332	maptile *m = op->map;	346	maptile *m = op->map;
333	sint16 nx, ny;	347	sint16 nx, ny;
334		348
335	darklevel = m->darkness;	349	darklevel = m->darkness;
336		350
337	/* If the player can see in the dark, lower the darklevel for him */	351	/* If the player can see in the dark, lower the darklevel for him */
338	if (QUERY_FLAG (op, FLAG_SEE_IN_DARK))	352	if (QUERY_FLAG (op, FLAG_SEE_IN_DARK))
339	darklevel -= 2;	353	darklevel -= LOS_MAX / 2;
340
341	/* add light, by finding all (non-null) nearby light sources, then
342	* mark those squares specially. If the darklevel<1, there is no
343	* reason to do this, so we skip this function
344	*/
345
346	if (darklevel < 1)
347	return;
348		354
349	/* Do a sanity check. If not valid, some code below may do odd	355	/* Do a sanity check. If not valid, some code below may do odd
350	* things.	356	* things.
351	*/	357	*/
352	if (darklevel > MAX_DARKNESS)	358	if (darklevel > MAX_DARKNESS)
353	{	359	{
354	LOG (llevError, "Map darkness for %s on %s is too high (%d)\n", &op->name, &op->map->path, darklevel);	360	LOG (llevError, "Map darkness for %s on %s is too high (%d)\n", &op->name, &op->map->path, darklevel);
355	darklevel = MAX_DARKNESS;	361	darklevel = MAX_DARKNESS;
356	}	362	}
357		363
358	/* First, limit player furthest (unlighted) vision */	364	int half_x = op->contr->ns->mapx / 2;
359	for (x = 0; x < op->contr->ns->mapx; x++)	365	int half_y = op->contr->ns->mapy / 2;
360	for (y = 0; y < op->contr->ns->mapy; y++)
361	if (op->contr->blocked_los[x][y] != 100)
362	op->contr->blocked_los[x][y] = MAX_LIGHT_RADII;
363		366
364	/* the spaces[] darkness value contains the information we need.	367	int min_x = op->x - half_x - MAX_LIGHT_RADIUS;
365	* Only process the area of interest.	368	int min_y = op->y - half_y - MAX_LIGHT_RADIUS;
366	* the basex, basey values represent the position in the op->contr->blocked_los	369	int max_x = op->x + half_x + MAX_LIGHT_RADIUS;
367	* array. Its easier to just increment them here (and start with the right	370	int max_y = op->y + half_y + MAX_LIGHT_RADIUS;
368	* value) than to recalculate them down below.	371
369	*/	372	int pass2 = 0; // negative lights have an extra pass
370	for (x = (op->x - op->contr->ns->mapx / 2 - MAX_LIGHT_RADII), basex = -MAX_LIGHT_RADII;	373
371	x <= (op->x + op->contr->ns->mapx / 2 + MAX_LIGHT_RADII); x++, basex++)	374	if (darklevel < 1)
		375	pass2 = 1;
		376	else
372	{	377	{
		378	/* first, make everything totally dark */
		379	for (int dx = -half_x; dx <= half_x; dx++)
		380	for (int dy = -half_x; dy <= half_y; dy++)
		381	if (op->contr->los[dx + LOS_X0][dy + LOS_Y0] != LOS_BLOCKED)
		382	op->contr->los[dx + LOS_X0][dy + LOS_Y0] = LOS_MAX;
373		383
374	for (y = (op->y - op->contr->ns->mapy / 2 - MAX_LIGHT_RADII), basey = -MAX_LIGHT_RADII;	384	/*
375	y <= (op->y + op->contr->ns->mapy / 2 + MAX_LIGHT_RADII); y++, basey++)	385	* Only process the area of interest.
		386	* the basex, basey values represent the position in the op->contr->los
		387	* array. Its easier to just increment them here (and start with the right
		388	* value) than to recalculate them down below.
		389	*/
		390	for (int x = min_x; x <= max_x; x++)
		391	for (int y = min_y; y <= max_y; y++)
376	{	392	{
		393	maptile *m = op->map;
		394	sint16 nx = x;
		395	sint16 ny = y;
		396
		397	if (!xy_normalise (m, nx, ny))
		398	continue;
		399
		400	mapspace &ms = m->at (nx, ny);
		401	ms.update ();
		402	sint8 light = ms.light;
		403
		404	if (expect_false (light))
		405	if (light < 0)
		406	pass2 = 1;
		407	else
		408	apply_light<los_brighten> (op, x - op->x, y - op->y, light, light_atten [light + MAX_LIGHT_RADIUS]);
		409	}
		410
		411	/* grant some vision to the player, based on the darklevel */
		412	{
		413	int light = clamp (MAX_DARKNESS - darklevel, 0, MAX_DARKNESS);
		414
		415	apply_light<los_brighten> (op, 0, 0, light, vision_atten [light]);
		416	}
		417	}
		418
		419	// possibly do 2nd pass for rare negative glow radii
		420	// for effect, those are always considered to be stronger than anything else
		421	// but they can't darken a place completely
		422	if (pass2)
		423	for (int x = min_x; x <= max_x; x++)
		424	for (int y = min_y; y <= max_y; y++)
		425	{
377	m = op->map;	426	maptile *m = op->map;
378	nx = x;	427	sint16 nx = x;
379	ny = y;	428	sint16 ny = y;
380		429
381	mflags = get_map_flags (m, &m, nx, ny, &nx, &ny);	430	if (!xy_normalise (m, nx, ny))
382
383	if (mflags & P_OUT_OF_MAP)
384	continue;	431	continue;
385		432
386	/* This space is providing light, so we need to brighten up the	433	mapspace &ms = m->at (nx, ny);
387	* spaces around here.	434	ms.update ();
388	*/	435	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	for (ay = basey - light; ay <= basey + light; ay++)
400	{
401	if (ay < 0 \|\| ay >= op->contr->ns->mapy)
402	continue;
403		436
404	/* If the space is fully blocked, do nothing. Otherwise, we	437	if (expect_false (light < 0))
405	* brighten the space. The further the light is away from the	438	apply_light<los_darken> (op, x - op->x, y - op->y, -light, light_atten [light + MAX_LIGHT_RADIUS]);
406	* source (basex-x), the less effect it has. Though light used
407	* to dim in a square manner, it now dims in a circular manner
408	* using the the pythagorean theorem. glow_radius still
409	* represents the radius
410	*/
411	if (op->contr->blocked_los[ax][ay] != 100)
412	{
413	x1 = abs (basex - ax) * abs (basex - ax);
414	y1 = abs (basey - ay) * abs (basey - ay);
415	if (light > 0)
416	op->contr->blocked_los[ax][ay] -= MAX ((light - isqrt (x1 + y1)), 0);
417	if (light < 0)
418	op->contr->blocked_los[ax][ay] -= MIN ((light + isqrt (x1 + y1)), 0);
419	}
420	} /* for ay */
421	} /* for ax */
422	} /* if this space is providing light */
423	} /* for y */
424	} /* for x */
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	}	439	}
440	}
441	/* grant some vision to the player, based on the darklevel */
442	for (x = darklevel - MAX_DARKNESS; x < MAX_DARKNESS + 1 - darklevel; x++)
443	for (y = darklevel - MAX_DARKNESS; y < MAX_DARKNESS + 1 - darklevel; y++)
444	if (!(op->contr->blocked_los[x + op->contr->ns->mapx / 2][y + op->contr->ns->mapy / 2] == 100))
445	op->contr->blocked_los[x + op->contr->ns->mapx / 2][y + op->contr->ns->mapy / 2] -=
446	MAX (0, 6 - darklevel - MAX (abs (x), abs (y)));
447	}	440	}
448		441
449	/* blinded_sight() - sets all veiwable squares to blocked except	442	/* blinded_sight() - sets all viewable squares to blocked except
450	* for the one the central one that the player occupies. A little	443	* for the one the central one that the player occupies. A little
451	* odd that you can see yourself (and what your standing on), but	444	* odd that you can see yourself (and what your standing on), but
452	* really need for any reasonable game play.	445	* really need for any reasonable game play.
453	*/	446	*/
454
455	static void	447	static void
456	blinded_sight (object *op)	448	blinded_sight (object *op)
457	{	449	{
458	int x, y;	450	op->contr->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	}	451	}
466		452
467	/*	453	/*
468	* update_los() recalculates the array which specifies what is	454	* update_los() recalculates the array which specifies what is
469	* visible for the given player-object.	455	* visible for the given player-object.
470	*/	456	*/
471
472	void	457	void
473	update_los (object *op)	458	update_los (object *op)
474	{	459	{
475	int dx = op->contr->ns->mapx / 2, dy = op->contr->ns->mapy / 2, x, y;
476
477	if (QUERY_FLAG (op, FLAG_REMOVED))	460	if (QUERY_FLAG (op, FLAG_REMOVED))
478	return;	461	return;
479		462
480	clear_los (op);	463	op->contr->clear_los ();
		464
481	if (QUERY_FLAG (op, FLAG_WIZ) /* \|\|XRAYS(op) */ )	465	if (QUERY_FLAG (op, FLAG_WIZ) /* \|\|XRAYS(op) */ )
482	return;	466	memset (op->contr->los, 0, sizeof (op->contr->los));
483
484	/* For larger maps, this is more efficient than the old way which
485	* used the chaining of the block array. Since many space views could
486	* be blocked by different spaces in front, this mean that a lot of spaces
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
494	/* do the los of the player. 3 (potential) cases */
495	if (QUERY_FLAG (op, FLAG_BLIND)) /* player is blind */	467	else if (QUERY_FLAG (op, FLAG_BLIND)) /* player is blind */
496	blinded_sight (op);	468	blinded_sight (op);
497	else	469	else
498	expand_sight (op);	470	{
		471	do_los (op);
		472	apply_lights (op);
		473	}
499		474
500	if (QUERY_FLAG (op, FLAG_XRAYS))	475	if (QUERY_FLAG (op, FLAG_XRAYS))
501	{
502	int x, y;
503
504	for (x = -2; x <= 2; x++)	476	for (int dx = -2; dx <= 2; dx++)
505	for (y = -2; y <= 2; y++)	477	for (int dy = -2; dy <= 2; dy++)
506	op->contr->blocked_los[dx + x][dy + y] = 0;	478	op->contr->los[dx + LOS_X0][dy + LOS_X0] = 0;
507	}
508	}	479	}
509		480
510	/* update all_map_los is like update_all_los below,	481	/* update all_map_los is like update_all_los below,
511	* but updates everyone on the map, no matter where they	482	* but updates everyone on the map, no matter where they
512	* are. This generally should not be used, as a per	483	* are. This generally should not be used, as a per
601	}	572	}
602	}	573	}
603	}	574	}
604		575
605	/*	576	/*
606	* Debug-routine which dumps the array which specifies the visible
607	* area of a player. Triggered by the z key in DM mode.
608	*/
609	void
610	print_los (object *op)
611	{
612	int x, y;
613	char buf[50], buf2[10];
614
615	strcpy (buf, " ");
616
617	for (x = 0; x < op->contr->ns->mapx; x++)
618	{
619	sprintf (buf2, "%2d", x);
620	strcat (buf, buf2);
621	}
622
623	new_draw_info (NDI_UNIQUE, 0, op, buf);
624
625	for (y = 0; y < op->contr->ns->mapy; y++)
626	{
627	sprintf (buf, "%2d:", y);
628
629	for (x = 0; x < op->contr->ns->mapx; x++)
630	{
631	sprintf (buf2, " %1d", op->contr->blocked_los[x][y]);
632	strcat (buf, buf2);
633	}
634
635	new_draw_info (NDI_UNIQUE, 0, op, buf);
636	}
637	}
638
639	/*
640	* make_sure_seen: The object is supposed to be visible through walls, thus	577	* make_sure_seen: The object is supposed to be visible through walls, thus
641	* check if any players are nearby, and edit their LOS array.	578	* check if any players are nearby, and edit their LOS array.
642	*/	579	*/
643
644	void	580	void
645	make_sure_seen (const object *op)	581	make_sure_seen (const object *op)
646	{	582	{
647	for_all_players (pl)	583	for_all_players (pl)
648	if (pl->ob->map == op->map &&	584	if (pl->ob->map == op->map &&
649	pl->ob->y - pl->ns->mapy / 2 <= op->y &&	585	pl->ob->y - pl->ns->mapy / 2 <= op->y &&
650	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)	586	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)
651	pl->blocked_los[pl->ns->mapx / 2 + op->x - pl->ob->x][pl->ns->mapy / 2 + op->y - pl->ob->y] = 0;	587	pl->los[op->x - pl->ob->x + LOS_X0][op->y - pl->ob->y + LOS_X0] = 0;
652	}	588	}
653		589
654	/*	590	/*
655	* make_sure_not_seen: The object which is supposed to be visible through	591	* make_sure_not_seen: The object which is supposed to be visible through
656	* walls has just been removed from the map, so update the los of any	592	* walls has just been removed from the map, so update the los of any
657	* players within its range	593	* players within its range
658	*/	594	*/
659
660	void	595	void
661	make_sure_not_seen (const object *op)	596	make_sure_not_seen (const object *op)
662	{	597	{
663	for_all_players (pl)	598	for_all_players (pl)
664	if (pl->ob->map == op->map &&	599	if (pl->ob->map == op->map &&

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Comparing deliantra/server/common/los.C (file contents): Revision 1.17 by root, Sun Jan 7 02:39:13 2007 UTC vs. Revision 1.45 by root, Sun Dec 21 23:29:27 2008 UTC

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Comparing deliantra/server/common/los.C (file contents):
Revision 1.17 by root, Sun Jan 7 02:39:13 2007 UTC vs.
Revision 1.45 by root, Sun Dec 21 23:29:27 2008 UTC