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

Comparing deliantra/server/common/los.C (file contents):
Revision 1.26 by root, Mon May 28 21:21:40 2007 UTC vs.
Revision 1.54 by root, Sat Dec 27 07:50:05 2008 UTC

…		…
1	/*	1	/*
2	* This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game.	2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	*	3	*
4	* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team	4	* Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	* Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team	5	* Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team
6	* Copyright (©) 1992,2007 Frank Tore Johansen	6	* Copyright (©) 1992,2007 Frank Tore Johansen
7	*	7	*
8	* Crossfire TRT is free software; you can redistribute it and/or modify it	8	* Deliantra is free software: you can redistribute it and/or modify
9	* under the terms of the GNU General Public License as published by the Free	9	* it under the terms of the GNU General Public License as published by
10	* Software Foundation; either version 2 of the License, or (at your option)	10	* the Free Software Foundation, either version 3 of the License, or
11	* 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, but	13	* This program is distributed in the hope that it will be useful,
14	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	* 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 along	18	* You should have received a copy of the GNU General Public License
19	* with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51	19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
20	* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21	*	20	*
22	* The authors can be reached via e-mail to <crossfire@schmorp.de>	21	* The authors can be reached via e-mail to <support@deliantra.net>
23	*/	22	*/
24
25	/* Nov 95 - inserted USE_LIGHTING code stuff in here - b.t. */
26		23
27	#include <global.h>	24	#include <global.h>
28	#include <funcpoint.h>
29	#include <math.h>	25	#include <cmath>
30		26
31	/* Distance must be less than this for the object to be blocked.	27	#define SEE_IN_DARK_RADIUS 3
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		28
38	#define SPACE_BLOCK 0.5	29	// los flags
		30	enum {
		31	FLG_XI = 0x01, // we have an x-parent
		32	FLG_YI = 0x02, // we have an y-parent
		33	FLG_BLOCKED = 0x04, // this space blocks the view
		34	FLG_QUEUED = 0x80 // already queued in queue, or border
		35	};
39		36
40	typedef struct blstr	37	struct los_info
41	{	38	{
42	int x[4], y[4];	39	uint8 flags; // FLG_xxx
43	int index;	40	uint8 culled; // culled from "tree"
44	} blocks;	41	uint8 visible;
		42	uint8 pad0;
45		43
46	// 31/32 == a speed hack	44	sint8 xo, yo; // obscure angle
47	// we would like to use 32 for speed, but the code loops endlessly	45	sint8 xe, ye; // angle deviation
48	// then, reason not yet identified, so only make the array use 32,	46	};
49	// not the define's.
50	blocks block[MAP_CLIENT_X][MAP_CLIENT_Y == 31 ? 32 : MAP_CLIENT_Y];
51		47
52	static void expand_lighted_sight (object *op);	48	// temporary storage for the los algorithm,
		49	// one los_info for each lightable map space
		50	static los_info los[MAP_CLIENT_X][MAP_CLIENT_Y];
53		51
54	/*	52	struct point
55	* Used to initialise the array used by the LOS routines.
56	* What this sets if that x,y blocks the view of bx,by
57	* This then sets up a relation - for example, something
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
64	static void
65	set_block (int x, int y, int bx, int by)
66	{	53	{
67	int index = block[x][y].index, i;
68
69	/* Due to flipping, we may get duplicates - better safe than sorry.
70	*/
71	for (i = 0; i < index; i++)
72	{
73	if (block[x][y].x[i] == bx && block[x][y].y[i] == by)
74	return;
75	}
76
77	block[x][y].x[index] = bx;
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	{
98	int x, y, dx, dy, i;
99	static int block_x[3] = { -1, -1, 0 },
100	block_y[3] = { -1, 0, -1 };
101
102	for (x = 0; x < MAP_CLIENT_X; x++)
103	for (y = 0; y < MAP_CLIENT_Y; y++)
104	block[x][y].index = 0;
105
106
107	/* The table should be symmetric, so only do the upper left
108	* quadrant - makes the processing easier.
109	*/
110	for (x = 1; x <= MAP_CLIENT_X / 2; x++)
111	{
112	for (y = 1; y <= MAP_CLIENT_Y / 2; y++)
113	{
114	for (i = 0; i < 3; i++)
115	{
116	dx = x + block_x[i];
117	dy = y + block_y[i];
118
119	/* center space never blocks */
120	if (x == MAP_CLIENT_X / 2 && y == MAP_CLIENT_Y / 2)
121	continue;
122
123	/* If its a straight line, its blocked */
124	if ((dx == x && x == MAP_CLIENT_X / 2) \|\| (dy == y && y == MAP_CLIENT_Y / 2))
125	{
126	/* For simplicity, we mirror the coordinates to block the other
127	* quadrants.
128	*/
129	set_block (x, y, dx, dy);
130	if (x == MAP_CLIENT_X / 2)
131	set_block (x, MAP_CLIENT_Y - y - 1, dx, MAP_CLIENT_Y - dy - 1);
132	else if (y == MAP_CLIENT_Y / 2)
133	set_block (MAP_CLIENT_X - x - 1, y, MAP_CLIENT_X - dx - 1, dy);
134	}
135	else
136	{
137	float d1, r, s, l;
138
139	/* We use the algorihm that found out how close the point
140	* (x,y) is to the line from dx,dy to the center of the viewable
141	* area. l is the distance from x,y to the line.
142	* r is more a curiosity - it lets us know what direction (left/right)
143	* the line is off
144	*/
145
146	d1 = (float) (pow (MAP_CLIENT_X / 2 - dx, 2.f) + pow (MAP_CLIENT_Y / 2 - dy, 2.f));
147	r = (float) ((dy - y) * (dy - MAP_CLIENT_Y / 2) - (dx - x) * (MAP_CLIENT_X / 2 - dx)) / d1;
148	s = (float) ((dy - y) * (MAP_CLIENT_X / 2 - dx) - (dx - x) * (MAP_CLIENT_Y / 2 - dy)) / d1;
149	l = FABS (sqrt (d1) * s);
150
151	if (l <= SPACE_BLOCK)
152	{
153	/* For simplicity, we mirror the coordinates to block the other
154	* quadrants.
155	*/
156	set_block (x, y, dx, dy);
157	set_block (MAP_CLIENT_X - x - 1, y, MAP_CLIENT_X - dx - 1, dy);
158	set_block (x, MAP_CLIENT_Y - y - 1, dx, MAP_CLIENT_Y - dy - 1);
159	set_block (MAP_CLIENT_X - x - 1, MAP_CLIENT_Y - y - 1, MAP_CLIENT_X - dx - 1, MAP_CLIENT_Y - dy - 1);
160	}
161	}
162	}
163	}
164	}
165	}
166
167	/*
168	* Used to initialise the array used by the LOS routines.
169	* x,y are indexes into the blocked[][] array.
170	* This recursively sets the blocked line of sight view.
171	* From the blocked[][] array, we know for example
172	* that if some particular space is blocked, it blocks
173	* the view of the spaces 'behind' it, and those blocked
174	* spaces behind it may block other spaces, etc.
175	* In this way, the chain of visibility is set.
176	*/
177	static void
178	set_wall (object *op, int x, int y)
179	{
180	int i;
181
182	for (i = 0; i < block[x][y].index; i++)
183	{
184	int dx = block[x][y].x[i], dy = block[x][y].y[i], ax, ay;
185
186	/* ax, ay are the values as adjusted to be in the
187	* socket look structure.
188	*/
189	ax = dx - (MAP_CLIENT_X - op->contr->ns->mapx) / 2;
190	ay = dy - (MAP_CLIENT_Y - op->contr->ns->mapy) / 2;
191
192	if (ax < 0 \|\| ax >= op->contr->ns->mapx \|\| ay < 0 \|\| ay >= op->contr->ns->mapy)
193	continue;
194	#if 0
195	LOG (llevDebug, "blocked %d %d -> %d %d\n", dx, dy, ax, ay);
196	#endif
197	/* we need to adjust to the fact that the socket
198	* code wants the los to start from the 0,0
199	* and not be relative to middle of los array.
200	*/
201	op->contr->blocked_los[ax][ay] = 100;
202	set_wall (op, dx, dy);
203	}
204	}
205
206	/*
207	* Used to initialise the array used by the LOS routines.
208	* op is the object, x and y values based on MAP_CLIENT_X and Y.
209	* this is because they index the blocked[][] arrays.
210	*/
211
212	static void
213	check_wall (object *op, int x, int y)
214	{
215	int ax, ay;	54	sint8 x, y;
		55	};
216		56
217	if (!block[x][y].index)	57	// minimum size, but must be a power of two
218	return;	58	#define QUEUE_LENGTH ((MAP_CLIENT_X + MAP_CLIENT_Y) * 2)
219		59
220	/* ax, ay are coordinates as indexed into the look window */	60	// a queue of spaces to calculate
221	ax = x - (MAP_CLIENT_X - op->contr->ns->mapx) / 2;	61	static point queue [QUEUE_LENGTH];
222	ay = y - (MAP_CLIENT_Y - op->contr->ns->mapy) / 2;	62	static int q1, q2; // queue start, end
223
224	/* If the converted coordinates are outside the viewable
225	* area for the client, return now.
226	*/
227	if (ax < 0 \|\| ay < 0 \|\| ax >= op->contr->ns->mapx \|\| ay >= op->contr->ns->mapy)
228	return;
229
230	#if 0
231	LOG (llevDebug, "check_wall, ax,ay=%d, %d x,y = %d, %d blocksview = %d, %d\n",
232	ax, ay, x, y, op->x + x - MAP_CLIENT_X / 2, op->y + y - MAP_CLIENT_Y / 2);
233	#endif
234
235	/* If this space is already blocked, prune the processing - presumably
236	* whatever has set this space to be blocked has done the work and already
237	* done the dependency chain.
238	*/
239	if (op->contr->blocked_los[ax][ay] == 100)
240	return;
241
242
243	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))
244	set_wall (op, x, y);
245	}
246		63
247	/*	64	/*
248	* Clears/initialises the los-array associated to the player	65	* Clears/initialises the los-array associated to the player
249	* controlling the object.	66	* controlling the object.
250	*/	67	*/
251
252	void	68	void
253	clear_los (object *op)	69	player::clear_los (sint8 value)
254	{	70	{
255	/* This is safer than using the ns->mapx, mapy because	71	memset (los, value, sizeof (los));
256	* we index the blocked_los as a 2 way array, so clearing
257	* the first z spaces may not not cover the spaces we are
258	* actually going to use
259	*/
260	(void) memset ((void ) op->contr->blocked_los, 0, MAP_CLIENT_X MAP_CLIENT_Y);
261	}	72	}
262		73
263	/*	74	// enqueue a single mapspace, but only if it hasn't
264	* expand_sight goes through the array of what the given player is	75	// been enqueued yet.
265	* able to see, and expands the visible area a bit, so the player will,
266	* to a certain degree, be able to see into corners.
267	* This is somewhat suboptimal, would be better to improve the formula.
268	*/
269
270	static void	76	static void
271	expand_sight (object *op)	77	enqueue (sint8 dx, sint8 dy, uint8 flags = 0)
272	{	78	{
273	int i, x, y, dx, dy;	79	sint8 x = LOS_X0 + dx;
		80	sint8 y = LOS_Y0 + dy;
274		81
275	for (x = 1; x < op->contr->ns->mapx - 1; x++) /* loop over inner squares */	82	los_info &l = los[x][y];
276	for (y = 1; y < op->contr->ns->mapy - 1; y++)	83
		84	l.flags \|= flags;
		85
		86	if (l.flags & FLG_QUEUED)
		87	return;
		88
		89	l.flags \|= FLG_QUEUED;
		90
		91	queue[q1].x = dx;
		92	queue[q1].y = dy;
		93
		94	q1 = (q1 + 1) & (QUEUE_LENGTH - 1);
		95	}
		96
		97	// run the los algorithm
		98	// this is a variant of a spiral los algorithm taken from
		99	// http://www.geocities.com/temerra/los_rays.html
		100	// which has been simplified and changed considerably, but
		101	// still is basically the same algorithm.
		102	static void
		103	calculate_los (player *pl)
		104	{
		105	{
		106	memset (los, 0, sizeof (los));
		107
		108	// we keep one line for ourselves, for the border flag
		109	// so the client area is actually MAP_CLIENT_(X\|Y) - 2
		110	int half_x = min (LOS_X0 - 1, pl->ns->mapx / 2);
		111	int half_y = min (LOS_Y0 - 1, pl->ns->mapy / 2);
		112
		113	// create borders, the corners are not touched
		114	for (int dx = -half_x; dx <= half_x; ++dx)
		115	los [dx + LOS_X0][LOS_Y0 - (half_y + 1)].flags =
		116	los [dx + LOS_X0][LOS_Y0 + (half_y + 1)].flags = FLG_QUEUED;
		117
		118	for (int dy = -half_y; dy <= half_y; ++dy)
		119	los [LOS_X0 - (half_x + 1)][dy + LOS_Y0].flags =
		120	los [LOS_X0 + (half_x + 1)][dy + LOS_Y0].flags = FLG_QUEUED;
		121
		122	// now reset the los area and also add blocked flags
		123	// which supposedly is faster than doing it inside the
		124	// spiral path algorithm below, except when very little
		125	// area is visible, in which case it is slower. which evens
		126	// out los calculation times between large and small los maps.
		127	// apply_lights also iterates over this area, maybe these
		128	// two passes could be combined somehow.
		129	unordered_mapwalk (pl->observe, -half_x, -half_y, half_x, half_y)
277	{	130	{
278	if (!op->contr->blocked_los[x][y] &&	131	los_info &l = los [LOS_X0 + dx][LOS_Y0 + dy];
279	!(get_map_flags (op->map, NULL,	132	l.flags = m->at (nx, ny).flags () & P_BLOCKSVIEW ? FLG_BLOCKED : 0;
280	op->x - op->contr->ns->mapx / 2 + x,
281	op->y - op->contr->ns->mapy / 2 + y, NULL, NULL) & (P_BLOCKSVIEW \| P_OUT_OF_MAP)))
282	{
283
284	for (i = 1; i <= 8; i += 1)
285	{ /* mark all directions */
286	dx = x + freearr_x[i];
287	dy = y + freearr_y[i];
288	if (op->contr->blocked_los[dx][dy] > 0) /* for any square blocked */
289	op->contr->blocked_los[dx][dy] = -1;
290	}
291	}
292	}	133	}
		134	}
293		135
294	if (op->map->darkness > 0) /* player is on a dark map */	136	q1 = 0; q2 = 0; // initialise queue, not strictly required
295	expand_lighted_sight (op);	137	enqueue (0, 0); // enqueue center
296		138
297	/* clear mark squares */	139	// treat the origin specially
298	for (x = 0; x < op->contr->ns->mapx; x++)	140	los[LOS_X0][LOS_Y0].visible = 1;
299	for (y = 0; y < op->contr->ns->mapy; y++)	141	pl->los[LOS_X0][LOS_Y0] = 0;
300	if (op->contr->blocked_los[x][y] < 0)	142
301	op->contr->blocked_los[x][y] = 0;	143	// loop over all enqueued points until the queue is empty
		144	// the order in which this is done ensures that we
		145	// never touch a mapspace whose input spaces we haven't checked
		146	// yet.
		147	while (q1 != q2)
		148	{
		149	sint8 dx = queue[q2].x;
		150	sint8 dy = queue[q2].y;
		151
		152	q2 = (q2 + 1) & (QUEUE_LENGTH - 1);
		153
		154	sint8 x = LOS_X0 + dx;
		155	sint8 y = LOS_Y0 + dy;
		156
		157	los_info &l = los[x][y];
		158
		159	if (expect_true (l.flags & (FLG_XI \| FLG_YI)))
		160	{
		161	l.culled = 1;
		162	l.xo = l.yo = l.xe = l.ye = 0;
		163
		164	// check contributing spaces, first horizontal
		165	if (expect_true (l.flags & FLG_XI))
		166	{
		167	los_info *xi = &los[x - sign (dx)][y];
		168
		169	// don't cull unless obscured
		170	l.culled &= !xi->visible;
		171
		172	/* merge input space */
		173	if (expect_false (xi->xo \|\| xi->yo))
		174	{
		175	// The X input can provide two main pieces of information:
		176	// 1. Progressive X obscurity.
		177	// 2. Recessive Y obscurity.
		178
		179	// Progressive X obscurity, favouring recessive input angle
		180	if (xi->xe > 0 && l.xo == 0)
		181	{
		182	l.xe = xi->xe - xi->yo;
		183	l.ye = xi->ye + xi->yo;
		184	l.xo = xi->xo;
		185	l.yo = xi->yo;
		186	}
		187
		188	// Recessive Y obscurity
		189	if (xi->ye <= 0 && xi->yo > 0 && xi->xe > 0)
		190	{
		191	l.ye = xi->yo + xi->ye;
		192	l.xe = xi->xe - xi->yo;
		193	l.xo = xi->xo;
		194	l.yo = xi->yo;
		195	}
		196	}
		197	}
		198
		199	// check contributing spaces, last vertical, identical structure
		200	if (expect_true (l.flags & FLG_YI))
		201	{
		202	los_info *yi = &los[x][y - sign (dy)];
		203
		204	// don't cull unless obscured
		205	l.culled &= !yi->visible;
		206
		207	/* merge input space */
		208	if (expect_false (yi->yo \|\| yi->xo))
		209	{
		210	// The Y input can provide two main pieces of information:
		211	// 1. Progressive Y obscurity.
		212	// 2. Recessive X obscurity.
		213
		214	// Progressive Y obscurity, favouring recessive input angle
		215	if (yi->ye > 0 && l.yo == 0)
		216	{
		217	l.ye = yi->ye - yi->xo;
		218	l.xe = yi->xe + yi->xo;
		219	l.yo = yi->yo;
		220	l.xo = yi->xo;
		221	}
		222
		223	// Recessive X obscurity
		224	if (yi->xe <= 0 && yi->xo > 0 && yi->ye > 0)
		225	{
		226	l.xe = yi->xo + yi->xe;
		227	l.ye = yi->ye - yi->xo;
		228	l.yo = yi->yo;
		229	l.xo = yi->xo;
		230	}
		231	}
		232	}
		233
		234	if (l.flags & FLG_BLOCKED)
		235	{
		236	l.xo = l.xe = abs (dx);
		237	l.yo = l.ye = abs (dy);
		238
		239	// we obscure dependents, but might be visible
		240	// copy the los from the square towards the player,
		241	// so outward diagonal corners are lit.
		242	pl->los[x][y] = los[x - sign0 (dx)][y - sign0 (dy)].visible ? 0 : LOS_BLOCKED;
		243
		244	l.visible = false;
		245	}
		246	else
		247	{
		248	// we are not blocked, so calculate visibility, by checking
		249	// whether we are inside or outside the shadow
		250	l.visible = (l.xe <= 0 \|\| l.xe > l.xo)
		251	&& (l.ye <= 0 \|\| l.ye > l.yo);
		252
		253	pl->los[x][y] = l.culled ? LOS_BLOCKED
		254	: l.visible ? 0
		255	: 3;
		256	}
		257
		258	}
		259
		260	// Expands by the unit length in each component's current direction.
		261	// If a component has no direction, then it is expanded in both of its
		262	// positive and negative directions.
		263	if (!l.culled)
		264	{
		265	if (dx >= 0) enqueue (dx + 1, dy, FLG_XI);
		266	if (dx <= 0) enqueue (dx - 1, dy, FLG_XI);
		267	if (dy >= 0) enqueue (dx, dy + 1, FLG_YI);
		268	if (dy <= 0) enqueue (dx, dy - 1, FLG_YI);
		269	}
		270	}
302	}	271	}
303		272
304	/* returns true if op carries one or more lights	273	/* returns true if op carries one or more lights
305	* This is a trivial function now days, but it used to	274	* This is a trivial function now days, but it used to
306	* be a bit longer. Probably better for callers to just	275	* be a bit longer. Probably better for callers to just
307	* check the op->glow_radius instead of calling this.	276	* check the op->glow_radius instead of calling this.
308	*/	277	*/
309
310	int	278	int
311	has_carried_lights (const object *op)	279	has_carried_lights (const object *op)
312	{	280	{
313	/* op may glow! */	281	/* op may glow! */
314	if (op->glow_radius > 0)	282	if (op->glow_radius > 0)
315	return 1;	283	return 1;
316		284
317	return 0;	285	return 0;
318	}	286	}
319		287
		288	/* radius, distance => lightness adjust */
		289	static sint8 light_atten[MAX_LIGHT_RADIUS * 2 + 1][MAX_LIGHT_RADIUS * 3 / 2 + 1];
		290	static sint8 vision_atten[MAX_DARKNESS + SEE_IN_DARK_RADIUS + 1][(MAX_DARKNESS + SEE_IN_DARK_RADIUS) * 3 / 2 + 1];
		291
		292	static struct los_init
		293	{
		294	los_init ()
		295	{
		296	assert (("QUEUE_LENGTH, MAP_CLIENT_X and MAP_CLIENT_Y must be powers of two",
		297	!(QUEUE_LENGTH & (QUEUE_LENGTH - 1))));
		298
		299	/* for lights */
		300	for (int radius = -MAX_LIGHT_RADIUS; radius <= MAX_LIGHT_RADIUS; ++radius)
		301	for (int distance = 0; distance <= MAX_LIGHT_RADIUS * 3 / 2; ++distance)
		302	{
		303	// max intensity
		304	int intensity = min (LOS_MAX, abs (radius) + 1);
		305
		306	// actual intensity
		307	intensity = max (0, lerp_rd (distance, 0, abs (radius) + 1, intensity, 0));
		308
		309	light_atten [radius + MAX_LIGHT_RADIUS][distance] = radius < 0
		310	? min (3, intensity)
		311	: LOS_MAX - intensity;
		312	}
		313
		314	/* for general vision */
		315	for (int radius = 0; radius <= MAX_DARKNESS + SEE_IN_DARK_RADIUS; ++radius)
		316	for (int distance = 0; distance <= (MAX_DARKNESS + SEE_IN_DARK_RADIUS) * 3 / 2; ++distance)
		317	vision_atten [radius][distance] = distance <= radius ? 3 : 4;
		318	}
		319	} los_init;
		320
		321	sint8
		322	los_brighten (sint8 b, sint8 l)
		323	{
		324	return b == LOS_BLOCKED ? b : min (b, l);
		325	}
		326
		327	sint8
		328	los_darken (sint8 b, sint8 l)
		329	{
		330	return max (b, l);
		331	}
		332
		333	template<sint8 change_it (sint8, sint8)>
320	static void	334	static void
321	expand_lighted_sight (object *op)	335	apply_light (player pl, int dx, int dy, int light, const sint8 atten_table)
322	{	336	{
323	int x, y, darklevel, ax, ay, basex, basey, mflags, light, x1, y1;	337	// min or max the circular area around basex, basey
324	maptile *m = op->map;	338	dx += LOS_X0;
325	sint16 nx, ny;	339	dy += LOS_Y0;
326		340
327	darklevel = m->darkness;	341	int hx = pl->ns->mapx / 2;
		342	int hy = pl->ns->mapy / 2;
328		343
329	/* If the player can see in the dark, lower the darklevel for him */	344	int ax0 = max (LOS_X0 - hx, dx - light);
330	if (QUERY_FLAG (op, FLAG_SEE_IN_DARK))	345	int ay0 = max (LOS_Y0 - hy, dy - light);
331	darklevel -= 2;	346	int ax1 = min (dx + light, LOS_X0 + hx);
		347	int ay1 = min (dy + light, LOS_Y0 + hy);
332		348
		349	for (int ax = ax0; ax <= ax1; ax++)
		350	for (int ay = ay0; ay <= ay1; ay++)
		351	pl->los[ax][ay] =
		352	change_it (pl->los[ax][ay], atten_table [idistance (ax - dx, ay - dy)]);
		353	}
		354
333	/* add light, by finding all (non-null) nearby light sources, then	355	/* add light, by finding all (non-null) nearby light sources, then
334	* mark those squares specially. If the darklevel<1, there is no	356	* mark those squares specially.
335	* reason to do this, so we skip this function
336	*/	357	*/
		358	static void
		359	apply_lights (player *pl)
		360	{
		361	object *op = pl->observe;
		362	int darklevel = op->map->darklevel ();
337		363
		364	int half_x = pl->ns->mapx / 2;
		365	int half_y = pl->ns->mapy / 2;
		366
		367	int pass2 = 0; // negative lights have an extra pass
		368
		369	maprect *rects = pl->observe->map->split_to_tiles (
		370	pl->observe->x - half_x - MAX_LIGHT_RADIUS,
		371	pl->observe->y - half_y - MAX_LIGHT_RADIUS,
		372	pl->observe->x + half_x + MAX_LIGHT_RADIUS + 1,
		373	pl->observe->y + half_y + MAX_LIGHT_RADIUS + 1
		374	);
		375
338	if (darklevel < 1)	376	if (!darklevel)
339	return;	377	pass2 = 1;
340		378	else
341	/* Do a sanity check. If not valid, some code below may do odd
342	* things.
343	*/
344	if (darklevel > MAX_DARKNESS)
345	{	379	{
346	LOG (llevError, "Map darkness for %s on %s is too high (%d)\n", &op->name, &op->map->path, darklevel);	380	/* first, make everything totally dark */
347	darklevel = MAX_DARKNESS;	381	for (int dx = -half_x; dx <= half_x; dx++)
		382	for (int dy = -half_x; dy <= half_y; dy++)
		383	max_it (pl->los[dx + LOS_X0][dy + LOS_Y0], LOS_MAX);
		384
		385	/*
		386	* Only process the area of interest.
		387	* the basex, basey values represent the position in the op->contr->los
		388	* array. Its easier to just increment them here (and start with the right
		389	* value) than to recalculate them down below.
		390	*/
		391	for (maprect *r = rects; r->m; ++r)
		392	rect_mapwalk (r, 0, 0)
		393	{
		394	mapspace &ms = m->at (nx, ny);
		395	ms.update ();
		396	sint8 light = ms.light;
		397
		398	if (expect_false (light))
		399	if (light < 0)
		400	pass2 = 1;
		401	else
		402	apply_light<los_brighten> (pl, dx - pl->observe->x, dy - pl->observe->y, light, light_atten [light + MAX_LIGHT_RADIUS]);
		403	}
		404
		405	/* grant some vision to the player, based on the darklevel */
		406	{
		407	int light = clamp (MAX_DARKNESS - darklevel, 0, MAX_DARKNESS);
		408
		409	/* If the player can see in the dark, lower the darklevel for him */
		410	if (op->flag [FLAG_SEE_IN_DARK])
		411	light += SEE_IN_DARK_RADIUS;
		412
		413	apply_light<los_brighten> (pl, 0, 0, light, vision_atten [light]);
		414	}
348	}	415	}
349		416
350	/* First, limit player furthest (unlighted) vision */	417	// possibly do 2nd pass for rare negative glow radii
351	for (x = 0; x < op->contr->ns->mapx; x++)	418	// for effect, those are always considered to be stronger than anything else
352	for (y = 0; y < op->contr->ns->mapy; y++)	419	// but they can't darken a place completely
353	if (op->contr->blocked_los[x][y] != 100)	420	if (pass2)
354	op->contr->blocked_los[x][y] = MAX_LIGHT_RADII;	421	for (maprect *r = rects; r->m; ++r)
355		422	rect_mapwalk (r, 0, 0)
356	/* the spaces[] darkness value contains the information we need.
357	* Only process the area of interest.
358	* the basex, basey values represent the position in the op->contr->blocked_los
359	* array. Its easier to just increment them here (and start with the right
360	* value) than to recalculate them down below.
361	*/
362	for (x = (op->x - op->contr->ns->mapx / 2 - MAX_LIGHT_RADII), basex = -MAX_LIGHT_RADII;
363	x <= (op->x + op->contr->ns->mapx / 2 + MAX_LIGHT_RADII); x++, basex++)
364	{
365
366	for (y = (op->y - op->contr->ns->mapy / 2 - MAX_LIGHT_RADII), basey = -MAX_LIGHT_RADII;
367	y <= (op->y + op->contr->ns->mapy / 2 + MAX_LIGHT_RADII); y++, basey++)
368	{
369	m = op->map;
370	nx = x;
371	ny = y;
372
373	mflags = get_map_flags (m, &m, nx, ny, &nx, &ny);
374
375	if (mflags & P_OUT_OF_MAP)
376	continue;
377
378	/* This space is providing light, so we need to brighten up the
379	* spaces around here.
380	*/
381	light = GET_MAP_LIGHT (m, nx, ny);
382	if (light != 0)
383	{	423	{
384	#if 0	424	mapspace &ms = m->at (nx, ny);
385	LOG (llevDebug, "expand_lighted_sight: Found light at x=%d, y=%d, basex=%d, basey=%d\n", x, y, basex, basey);	425	ms.update ();
386	#endif	426	sint8 light = ms.light;
387	for (ax = basex - light; ax <= basex + light; ax++)
388	{
389	if (ax < 0 \|\| ax >= op->contr->ns->mapx)
390	continue;
391		427
392	for (ay = basey - light; ay <= basey + light; ay++)	428	if (expect_false (light < 0))
393	{	429	apply_light<los_darken> (pl, dx - pl->observe->x, dy - pl->observe->y, -light, light_atten [light + MAX_LIGHT_RADIUS]);
394	if (ay < 0 \|\| ay >= op->contr->ns->mapy)
395	continue;
396
397	/* If the space is fully blocked, do nothing. Otherwise, we
398	* brighten the space. The further the light is away from the
399	* source (basex-x), the less effect it has. Though light used
400	* to dim in a square manner, it now dims in a circular manner
401	* using the the pythagorean theorem. glow_radius still
402	* represents the radius
403	*/
404	if (op->contr->blocked_los[ax][ay] != 100)
405	{
406	x1 = abs (basex - ax) * abs (basex - ax);
407	y1 = abs (basey - ay) * abs (basey - ay);
408
409	if (light > 0) op->contr->blocked_los[ax][ay] -= max (light - isqrt (x1 + y1), 0);
410	if (light < 0) op->contr->blocked_los[ax][ay] -= min (light + isqrt (x1 + y1), 0);
411	}
412	}
413	}
414	}
415	}	430	}
416	}
417
418	/* Outdoor should never really be completely pitch black dark like
419	* a dungeon, so let the player at least see a little around themselves
420	*/
421	if (op->map->outdoor && darklevel > (MAX_DARKNESS - 3))
422	{
423	if (op->contr->blocked_los[op->contr->ns->mapx / 2][op->contr->ns->mapy / 2] > (MAX_DARKNESS - 3))
424	op->contr->blocked_los[op->contr->ns->mapx / 2][op->contr->ns->mapy / 2] = MAX_DARKNESS - 3;
425
426	for (x = -1; x <= 1; x++)
427	for (y = -1; y <= 1; y++)
428	{
429	if (op->contr->blocked_los[x + op->contr->ns->mapx / 2][y + op->contr->ns->mapy / 2] > (MAX_DARKNESS - 2))
430	op->contr->blocked_los[x + op->contr->ns->mapx / 2][y + op->contr->ns->mapy / 2] = MAX_DARKNESS - 2;
431	}
432	}
433
434	/* grant some vision to the player, based on the darklevel */
435	for (x = darklevel - MAX_DARKNESS; x < MAX_DARKNESS + 1 - darklevel; x++)
436	for (y = darklevel - MAX_DARKNESS; y < MAX_DARKNESS + 1 - darklevel; y++)
437	if (!(op->contr->blocked_los[x + op->contr->ns->mapx / 2][y + op->contr->ns->mapy / 2] == 100))
438	op->contr->blocked_los[x + op->contr->ns->mapx / 2][y + op->contr->ns->mapy / 2] -=
439	MAX (0, 6 - darklevel - MAX (abs (x), abs (y)));
440	}	431	}
441		432
442	/* blinded_sight() - sets all veiwable squares to blocked except	433	/* blinded_sight() - sets all viewable squares to blocked except
443	* for the one the central one that the player occupies. A little	434	* for the one the central one that the player occupies. A little
444	* odd that you can see yourself (and what your standing on), but	435	* odd that you can see yourself (and what your standing on), but
445	* really need for any reasonable game play.	436	* really need for any reasonable game play.
446	*/	437	*/
447	static void	438	static void
448	blinded_sight (object *op)	439	blinded_sight (player *pl)
449	{	440	{
450	int x, y;	441	pl->los[LOS_X0][LOS_Y0] = 1;
451
452	for (x = 0; x < op->contr->ns->mapx; x++)
453	for (y = 0; y < op->contr->ns->mapy; y++)
454	op->contr->blocked_los[x][y] = 100;
455
456	op->contr->blocked_los[op->contr->ns->mapx / 2][op->contr->ns->mapy / 2] = 0;
457	}	442	}
458		443
459	/*	444	/*
460	* update_los() recalculates the array which specifies what is	445	* update_los() recalculates the array which specifies what is
461	* visible for the given player-object.	446	* visible for the given player-object.
462	*/	447	*/
463
464	void	448	void
465	update_los (object *op)	449	player::update_los ()
466	{	450	{
467	int dx = op->contr->ns->mapx / 2, dy = op->contr->ns->mapy / 2, x, y;	451	if (ob->flag [FLAG_REMOVED])//D really needed?
468
469	if (QUERY_FLAG (op, FLAG_REMOVED))
470	return;	452	return;
471		453
		454	if (ob->flag [FLAG_WIZLOOK])
472	clear_los (op);	455	clear_los (0);
473	if (QUERY_FLAG (op, FLAG_WIZ) /* \|\|XRAYS(op) */ )	456	else if (observe->flag [FLAG_BLIND]) /* player is blind */
474	return;	457	{
475		458	clear_los ();
476	/* For larger maps, this is more efficient than the old way which
477	* used the chaining of the block array. Since many space views could
478	* be blocked by different spaces in front, this mean that a lot of spaces
479	* could be examined multile times, as each path would be looked at.
480	*/
481	for (x = (MAP_CLIENT_X - op->contr->ns->mapx) / 2 - 1; x < (MAP_CLIENT_X + op->contr->ns->mapx) / 2 + 1; x++)
482	for (y = (MAP_CLIENT_Y - op->contr->ns->mapy) / 2 - 1; y < (MAP_CLIENT_Y + op->contr->ns->mapy) / 2 + 1; y++)
483	check_wall (op, x, y);
484
485	/* do the los of the player. 3 (potential) cases */
486	if (QUERY_FLAG (op, FLAG_BLIND)) /* player is blind */
487	blinded_sight (op);	459	blinded_sight (this);
		460	}
488	else	461	else
489	expand_sight (op);	462	{
		463	clear_los ();
		464	calculate_los (this);
		465	apply_lights (this);
		466	}
490		467
491	//TODO: no range-checking whatsoever :(	468	if (observe->flag [FLAG_XRAYS])
492	if (QUERY_FLAG (op, FLAG_XRAYS))
493	for (int x = -2; x <= 2; x++)	469	for (int dx = -2; dx <= 2; dx++)
494	for (int y = -2; y <= 2; y++)	470	for (int dy = -2; dy <= 2; dy++)
495	op->contr->blocked_los[dx + x][dy + y] = 0;	471	min_it (los[dx + LOS_X0][dy + LOS_Y0], 1);
496	}	472	}
497		473
498	/* update all_map_los is like update_all_los below,	474	/* update all_map_los is like update_all_los below,
499	* but updates everyone on the map, no matter where they	475	* but updates everyone on the map, no matter where they
500	* are. This generally should not be used, as a per	476	* are. This generally should not be used, as a per
507	* change_map_light function	483	* change_map_light function
508	*/	484	*/
509	void	485	void
510	update_all_map_los (maptile *map)	486	update_all_map_los (maptile *map)
511	{	487	{
512	for_all_players (pl)	488	for_all_players_on_map (pl, map)
513	if (pl->ob && pl->ob->map == map)
514	pl->do_los = 1;	489	pl->do_los = 1;
515	}	490	}
516		491
517	/*	492	/*
518	* This function makes sure that update_los() will be called for all	493	* This function makes sure that update_los() will be called for all
519	* players on the given map within the next frame.	494	* players on the given map within the next frame.
…		…
527	* map is the map that changed, x and y are the coordinates.	502	* map is the map that changed, x and y are the coordinates.
528	*/	503	*/
529	void	504	void
530	update_all_los (const maptile *map, int x, int y)	505	update_all_los (const maptile *map, int x, int y)
531	{	506	{
		507	// no need to do anything if we don't have darkness
		508	if (map->darklevel () <= 0)
		509	return;
		510
		511	map->at (x, y).invalidate ();
		512
532	for_all_players (pl)	513	for_all_players (pl)
533	{	514	{
534	/* Player should not have a null map, but do this	515	/* Player should not have a null map, but do this
535	* check as a safety	516	* check as a safety
536	*/	517	*/
…		…
545	* player can't be on another map that may be closer,	526	* player can't be on another map that may be closer,
546	* so by setting it up this way, we trim processing	527	* so by setting it up this way, we trim processing
547	* some.	528	* some.
548	*/	529	*/
549	if (pl->ob->map == map)	530	if (pl->ob->map == map)
550	{
551	if ((abs (pl->ob->x - x) <= pl->ns->mapx / 2) && (abs (pl->ob->y - y) <= pl->ns->mapy / 2))	531	if ((abs (pl->ob->x - x) <= pl->ns->mapx / 2) && (abs (pl->ob->y - y) <= pl->ns->mapy / 2))
552	pl->do_los = 1;	532	pl->do_los = 1;
553	}
554		533
555	/* Now we check to see if player is on adjacent	534	/* Now we check to see if player is on adjacent
556	* maps to the one that changed and also within	535	* maps to the one that changed and also within
557	* view. The tile_maps[] could be null, but in that	536	* view. The tile_maps[] could be null, but in that
558	* case it should never match the pl->ob->map, so	537	* case it should never match the pl->ob->map, so
…		…
588	pl->do_los = 1;	567	pl->do_los = 1;
589	}	568	}
590	}	569	}
591	}	570	}
592		571
		572	static const int season_darkness[5][HOURS_PER_DAY] = {
		573	/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 /
		574	{ 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 },
		575	{ 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 },
		576	{ 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 },
		577	{ 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 },
		578	{ 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 }
		579	};
		580
593	/*	581	/*
594	* Debug-routine which dumps the array which specifies the visible	582	* Tell players the time and compute the darkness level for all maps in the game.
595	* area of a player. Triggered by the z key in DM mode.	583	* MUST be called exactly once per hour.
596	*/	584	*/
597	void	585	void
598	print_los (object *op)	586	maptile::adjust_daylight ()
599	{	587	{
600	int x, y;	588	timeofday_t tod;
601	char buf[50], buf2[10];
602		589
603	strcpy (buf, " ");	590	get_tod (&tod);
604		591
605	for (x = 0; x < op->contr->ns->mapx; x++)	592	// log the time to log-1 every hour, and to chat every day
606	{	593	{
607	sprintf (buf2, "%2d", x);	594	char todbuf[512];
608	strcat (buf, buf2);	595
		596	format_tod (todbuf, sizeof (todbuf), &tod);
		597
		598	for_all_players (pl)
		599	pl->ns->send_msg (NDI_GREY, tod.hour == 15 ? CHAT_CHANNEL : LOG_CHANNEL, todbuf);
609	}	600	}
610		601
611	new_draw_info (NDI_UNIQUE, 0, op, buf);	602	/* If the light level isn't changing, no reason to do all
		603	* the work below.
		604	*/
		605	sint8 new_darkness = season_darkness[tod.season][tod.hour];
612		606
613	for (y = 0; y < op->contr->ns->mapy; y++)	607	if (new_darkness == maptile::outdoor_darkness)
614	{	608	return;
615	sprintf (buf, "%2d:", y);
616		609
617	for (x = 0; x < op->contr->ns->mapx; x++)	610	new_draw_info (NDI_GREY \| NDI_UNIQUE \| NDI_ALL, 1, 0,
618	{	611	new_darkness > maptile::outdoor_darkness
619	sprintf (buf2, " %1d", op->contr->blocked_los[x][y]);	612	? "It becomes darker."
620	strcat (buf, buf2);	613	: "It becomes brighter.");
621	}
622		614
623	new_draw_info (NDI_UNIQUE, 0, op, buf);	615	maptile::outdoor_darkness = new_darkness;
624	}	616
		617	// we simply update the los for all players, which is unnecessarily
		618	// costly, but should do for the moment.
		619	for_all_players (pl)
		620	pl->do_los = 1;
625	}	621	}
626		622
627	/*	623	/*
628	* make_sure_seen: The object is supposed to be visible through walls, thus	624	* make_sure_seen: The object is supposed to be visible through walls, thus
629	* check if any players are nearby, and edit their LOS array.	625	* check if any players are nearby, and edit their LOS array.
630	*/	626	*/
631
632	void	627	void
633	make_sure_seen (const object *op)	628	make_sure_seen (const object *op)
634	{	629	{
635	for_all_players (pl)	630	for_all_players (pl)
636	if (pl->ob->map == op->map &&	631	if (pl->ob->map == op->map &&
637	pl->ob->y - pl->ns->mapy / 2 <= op->y &&	632	pl->ob->y - pl->ns->mapy / 2 <= op->y &&
638	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)	633	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)
639	pl->blocked_los[pl->ns->mapx / 2 + op->x - pl->ob->x][pl->ns->mapy / 2 + op->y - pl->ob->y] = 0;	634	pl->los[op->x - pl->ob->x + LOS_X0][op->y - pl->ob->y + LOS_Y0] = 0;
640	}	635	}
641		636
642	/*	637	/*
643	* make_sure_not_seen: The object which is supposed to be visible through	638	* make_sure_not_seen: The object which is supposed to be visible through
644	* walls has just been removed from the map, so update the los of any	639	* walls has just been removed from the map, so update the los of any
645	* players within its range	640	* players within its range
646	*/	641	*/
647
648	void	642	void
649	make_sure_not_seen (const object *op)	643	make_sure_not_seen (const object *op)
650	{	644	{
651	for_all_players (pl)	645	for_all_players (pl)
652	if (pl->ob->map == op->map &&	646	if (pl->ob->map == op->map &&
653	pl->ob->y - pl->ns->mapy / 2 <= op->y &&	647	pl->ob->y - pl->ns->mapy / 2 <= op->y &&
654	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)	648	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)
655	pl->do_los = 1;	649	pl->do_los = 1;
656	}	650	}
		651

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Comparing deliantra/server/common/los.C (file contents): Revision 1.26 by root, Mon May 28 21:21:40 2007 UTC vs. Revision 1.54 by root, Sat Dec 27 07:50:05 2008 UTC

Diff Legend

Comparing deliantra/server/common/los.C (file contents):
Revision 1.26 by root, Mon May 28 21:21:40 2007 UTC vs.
Revision 1.54 by root, Sat Dec 27 07:50:05 2008 UTC