4 .int disableclientprediction;
6 void sys_phys_simulate(entity this, float dt);
7 void sys_phys_simulate_simple(entity this, float dt);
9 void sys_phys_postupdate(entity this);
11 void sys_phys_update(entity this, float dt)
13 if (!IS_CLIENT(this)) {
14 sys_phys_simulate_simple(this, dt);
17 sys_in_update(this, dt);
19 sys_phys_fix(this, dt);
20 if (sys_phys_override(this, dt))
23 sys_phys_monitor(this, dt);
25 PHYS_CS(this).movement_old = PHYS_CS(this).movement;
26 PHYS_CS(this).v_angle_old = this.v_angle;
27 PHYS_CS(this).buttons_old = PHYS_INPUT_BUTTON_MASK(this);
31 sys_phys_pregame_hold(this);
34 if (this.move_movetype == MOVETYPE_NONE) { return; }
35 // when we get here, disableclientprediction cannot be 2
36 this.disableclientprediction = (this.move_qcphysics) ? -1 : 0;
39 viewloc_PlayerPhysics(this);
41 PM_check_frozen(this);
43 PM_check_blocked(this);
45 float maxspeed_mod = (!this.in_swamp) ? 1 : this.swamp_slowdown; // cvar("g_balance_swamp_moverate");
47 // conveyors: first fix velocity
48 if (this.conveyor.active) { this.velocity -= this.conveyor.movedir; }
49 MUTATOR_CALLHOOK(PlayerPhysics, this, dt);
51 if (!IS_PLAYER(this)) {
52 sys_phys_spectator_control(this);
53 maxspeed_mod = STAT(SPECTATORSPEED, this);
55 sys_phys_fixspeed(this, maxspeed_mod);
59 vector midpoint = ((this.absmin + this.absmax) * 0.5);
60 int cont = pointcontents(midpoint);
61 if (cont == CONTENT_WATER || cont == CONTENT_LAVA || cont == CONTENT_SLIME) {
62 this.velocity = this.velocity * 0.5;
65 // if(pointcontents(midpoint + '0 0 2') == CONTENT_WATER)
66 // { this.velocity_z = 70; }
68 sys_phys_postupdate(this);
74 if (IS_SVQC && !PHYS_FIXANGLE(this)) { this.angles = '0 1 0' * this.v_angle.y; }
75 if (IS_PLAYER(this)) {
76 if (IS_ONGROUND(this)) {
77 PM_check_hitground(this);
79 } else if (IsFlying(this)) {
80 this.wasFlying = true;
82 CheckPlayerJump(this);
85 if (this.flags & FL_WATERJUMP) {
86 this.velocity_x = this.movedir.x;
87 this.velocity_y = this.movedir.y;
88 if (this.waterlevel == WATERLEVEL_NONE
89 || time > PHYS_TELEPORT_TIME(this)
90 || PHYS_WATERJUMP_TIME(this) <= 0
92 this.flags &= ~FL_WATERJUMP;
93 PHYS_TELEPORT_TIME(this) = 0;
94 PHYS_WATERJUMP_TIME(this) = 0;
96 } else if (MUTATOR_CALLHOOK(PM_Physics, this, maxspeed_mod, dt)) {
98 } else if (this.move_movetype == MOVETYPE_NOCLIP
99 || this.move_movetype == MOVETYPE_FLY
100 || this.move_movetype == MOVETYPE_FLY_WORLDONLY
101 || MUTATOR_CALLHOOK(IsFlying, this)) {
102 this.com_phys_friction = PHYS_FRICTION(this);
103 this.com_phys_vel_max = PHYS_MAXSPEED(this) * maxspeed_mod;
104 this.com_phys_acc_rate = PHYS_ACCELERATE(this) * maxspeed_mod;
105 this.com_phys_friction_air = true;
106 sys_phys_simulate(this, dt);
107 this.com_phys_friction_air = false;
108 } else if (this.waterlevel >= WATERLEVEL_SWIMMING) {
109 this.com_phys_vel_max = PHYS_MAXSPEED(this) * maxspeed_mod;
110 this.com_phys_acc_rate = PHYS_ACCELERATE(this) * maxspeed_mod;
111 this.com_phys_water = true;
112 sys_phys_simulate(this, dt);
113 this.com_phys_water = false;
114 this.jumppadcount = 0;
115 } else if (time < this.ladder_time) {
116 this.com_phys_friction = PHYS_FRICTION(this);
117 this.com_phys_vel_max = PHYS_MAXSPEED(this) * maxspeed_mod;
118 this.com_phys_acc_rate = PHYS_ACCELERATE(this) * maxspeed_mod;
119 this.com_phys_gravity = '0 0 -1' * PHYS_GRAVITY(this) * dt;
120 if (PHYS_ENTGRAVITY(this)) { this.com_phys_gravity *= PHYS_ENTGRAVITY(this); }
121 this.com_phys_ladder = true;
122 this.com_phys_friction_air = true;
123 sys_phys_simulate(this, dt);
124 this.com_phys_friction_air = false;
125 this.com_phys_ladder = false;
126 this.com_phys_gravity = '0 0 0';
127 } else if (ITEMS_STAT(this) & IT_USING_JETPACK) {
128 PM_jetpack(this, maxspeed_mod, dt);
129 } else if (IS_ONGROUND(this)) {
130 if (!WAS_ONGROUND(this)) {
131 emit(phys_land, this);
132 if (this.lastground < time - 0.3) {
133 this.velocity *= (1 - PHYS_FRICTION_ONLAND(this));
136 this.com_phys_vel_max = PHYS_MAXSPEED(this) * maxspeed_mod;
137 this.com_phys_gravity = '0 0 -1' * PHYS_GRAVITY(this) * dt;
138 if (PHYS_ENTGRAVITY(this)) { this.com_phys_gravity *= PHYS_ENTGRAVITY(this); }
139 this.com_phys_ground = true;
140 this.com_phys_vel_2d = true;
141 sys_phys_simulate(this, dt);
142 this.com_phys_vel_2d = false;
143 this.com_phys_ground = false;
144 this.com_phys_gravity = '0 0 0';
146 this.com_phys_acc_rate_air = PHYS_AIRACCELERATE(this) * min(maxspeed_mod, 1);
147 this.com_phys_acc_rate_air_stop = PHYS_AIRSTOPACCELERATE(this) * maxspeed_mod;
148 this.com_phys_acc_rate_air_strafe = PHYS_AIRSTRAFEACCELERATE(this) * maxspeed_mod;
149 this.com_phys_vel_max_air_strafe = PHYS_MAXAIRSTRAFESPEED(this) * maxspeed_mod;
150 this.com_phys_vel_max_air = PHYS_MAXAIRSPEED(this) * maxspeed_mod;
151 this.com_phys_vel_max = PHYS_MAXAIRSPEED(this) * min(maxspeed_mod, 1);
152 this.com_phys_air = true;
153 this.com_phys_vel_2d = true;
154 sys_phys_simulate(this, dt);
155 this.com_phys_vel_2d = false;
156 this.com_phys_air = false;
159 sys_phys_postupdate(this);
162 void sys_phys_postupdate(entity this)
164 if (IS_ONGROUND(this)) { this.lastground = time; }
165 // conveyors: then break velocity again
166 if (this.conveyor.active) { this.velocity += this.conveyor.movedir; }
167 this.lastflags = this.flags;
169 this.lastclassname = this.classname;
173 void sys_phys_simulate(entity this, float dt)
175 if (!this.com_phys_ground && !this.com_phys_air) {
178 // on a spawnfunc_func_ladder
179 // swimming in spawnfunc_func_water
181 UNSET_ONGROUND(this);
183 if (this.com_phys_friction_air) {
184 const vector g = -this.com_phys_gravity;
185 this.velocity_z += g.z / 2;
186 this.velocity = this.velocity * (1 - dt * this.com_phys_friction);
187 this.velocity_z += g.z / 2;
191 if (this.com_phys_water) {
192 // water jump only in certain situations
193 // this mimics quakeworld code
194 if (this.com_in_jump && this.waterlevel == WATERLEVEL_SWIMMING && this.velocity_z >= -180 && !this.viewloc) {
195 vector yawangles = '0 1 0' * this.v_angle.y;
196 makevectors(yawangles);
197 vector forward = v_forward;
198 vector spot = this.origin + 24 * forward;
200 traceline(spot, spot, MOVE_NOMONSTERS, this);
201 if (trace_startsolid) {
203 traceline(spot, spot, MOVE_NOMONSTERS, this);
204 if (!trace_startsolid) {
205 this.velocity = forward * 50;
206 this.velocity_z = 310;
207 UNSET_ONGROUND(this);
213 makevectors(vmul(this.v_angle, (this.com_phys_vel_2d ? '0 1 0' : '1 1 1')));
214 // wishvel = v_forward * PHYS_CS(this).movement.x + v_right * PHYS_CS(this).movement.y + v_up * PHYS_CS(this).movement.z;
215 vector wishvel = v_forward * PHYS_CS(this).movement.x
216 + v_right * PHYS_CS(this).movement.y
217 + '0 0 1' * PHYS_CS(this).movement.z * (this.com_phys_vel_2d ? 0 : 1);
218 if (this.com_phys_water) {
219 if (PHYS_INPUT_BUTTON_CROUCH(this)) {
220 wishvel.z = -PHYS_MAXSPEED(this);
223 wishvel.z = -160; // drift anyway
224 } else if (wishvel == '0 0 0') {
225 wishvel = '0 0 -60'; // drift towards bottom
228 if (this.com_phys_ladder) {
230 wishvel.z = PHYS_CS(this).movement_old.x;
232 if (this.ladder_entity.classname == "func_water") {
233 float f = vlen(wishvel);
234 if (f > this.ladder_entity.speed) {
235 wishvel *= (this.ladder_entity.speed / f);
238 this.watertype = this.ladder_entity.skin;
239 f = this.ladder_entity.origin_z + this.ladder_entity.maxs_z;
240 if ((this.origin_z + this.view_ofs_z) < f) {
241 this.waterlevel = WATERLEVEL_SUBMERGED;
242 } else if ((this.origin_z + (this.mins_z + this.maxs_z) * 0.5) < f) {
243 this.waterlevel = WATERLEVEL_SWIMMING;
244 } else if ((this.origin_z + this.mins_z + 1) < f) {
245 this.waterlevel = WATERLEVEL_WETFEET;
247 this.waterlevel = WATERLEVEL_NONE;
248 this.watertype = CONTENT_EMPTY;
253 const vector wishdir = normalize(wishvel);
254 float wishspeed = min(vlen(wishvel), this.com_phys_vel_max);
256 if (this.com_phys_air) {
257 if ((IS_SVQC && time >= PHYS_TELEPORT_TIME(this))
258 || (IS_CSQC && PHYS_WATERJUMP_TIME(this) <= 0)) {
259 // apply air speed limit
260 float airaccelqw = PHYS_AIRACCEL_QW(this);
261 float wishspeed0 = wishspeed;
262 const float maxairspd = this.com_phys_vel_max;
263 wishspeed = min(wishspeed, maxairspd);
264 if (IS_DUCKED(this)) {
267 float airaccel = this.com_phys_acc_rate_air;
269 float accelerating = (this.velocity * wishdir > 0);
270 float wishspeed2 = wishspeed;
273 if (PHYS_AIRSTOPACCELERATE(this)) {
274 vector curdir = normalize(vec2(this.velocity));
275 airaccel += (this.com_phys_acc_rate_air_stop - airaccel) * max(0, -(curdir * wishdir));
277 // note that for straight forward jumping:
278 // step = accel * dt * wishspeed0;
279 // accel = bound(0, wishspeed - vel_xy_current, step) * accelqw + step * (1 - accelqw);
281 // dv/dt = accel * maxspeed (when slow)
282 // dv/dt = accel * maxspeed * (1 - accelqw) (when fast)
283 // log dv/dt = logaccel + logmaxspeed (when slow)
284 // log dv/dt = logaccel + logmaxspeed + log(1 - accelqw) (when fast)
285 float strafity = IsMoveInDirection(PHYS_CS(this).movement, -90) + IsMoveInDirection(PHYS_CS(this).movement, +90); // if one is nonzero, other is always zero
286 if (PHYS_MAXAIRSTRAFESPEED(this)) {
289 GeomLerp(this.com_phys_vel_max_air, strafity, this.com_phys_vel_max_air_strafe));
291 if (PHYS_AIRSTRAFEACCELERATE(this)) {
292 airaccel = GeomLerp(airaccel, strafity, this.com_phys_acc_rate_air_strafe);
294 if (PHYS_AIRSTRAFEACCEL_QW(this)) {
296 (((strafity > 0.5 ? PHYS_AIRSTRAFEACCEL_QW(this) : PHYS_AIRACCEL_QW(this)) >= 0) ? +1 : -1)
298 (1 - GeomLerp(1 - fabs(PHYS_AIRACCEL_QW(this)), strafity, 1 - fabs(PHYS_AIRSTRAFEACCEL_QW(this))));
302 if (PHYS_WARSOWBUNNY_TURNACCEL(this) && accelerating && PHYS_CS(this).movement.y == 0 && PHYS_CS(this).movement.x != 0) {
303 PM_AirAccelerate(this, dt, wishdir, wishspeed2);
305 float sidefric = maxairspd ? (PHYS_AIRACCEL_SIDEWAYS_FRICTION(this) / maxairspd) : 0;
306 PM_Accelerate(this, dt, wishdir, wishspeed, wishspeed0, airaccel, airaccelqw,
307 PHYS_AIRACCEL_QW_STRETCHFACTOR(this), sidefric, PHYS_AIRSPEEDLIMIT_NONQW(this));
310 if (PHYS_AIRCONTROL(this)) {
311 CPM_PM_Aircontrol(this, dt, wishdir, wishspeed2);
315 if (this.com_phys_ground && IS_DUCKED(this)) { wishspeed *= 0.5; }
316 if (this.com_phys_water) {
319 // if (PHYS_WATERJUMP_TIME(this) <= 0) // TODO: use
322 float f = 1 - dt * PHYS_FRICTION(this);
323 f = min(max(0, f), 1);
326 f = wishspeed - this.velocity * wishdir;
328 float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, f);
329 this.velocity += accelspeed * wishdir;
332 // holding jump button swims upward slowly
333 if (this.com_in_jump && !this.viewloc) {
338 // idea: double those
339 this.velocity_z = 200;
340 if (this.waterlevel >= WATERLEVEL_SUBMERGED) {
341 this.velocity_z = PHYS_MAXSPEED(this) * 0.7;
346 const float addspeed = wishspeed - this.velocity * wishdir;
348 const float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, addspeed);
349 this.velocity += accelspeed * wishdir;
352 // water acceleration
353 PM_Accelerate(this, dt, wishdir, wishspeed, wishspeed, this.com_phys_acc_rate, 1, 0, 0, 0);
357 if (this.com_phys_ground) {
358 // apply edge friction
359 const float f2 = vlen2(vec2(this.velocity));
361 trace_dphitq3surfaceflags = 0;
362 tracebox(this.origin, this.mins, this.maxs, this.origin - '0 0 1', MOVE_NOMONSTERS, this);
363 // TODO: apply edge friction
364 // apply ground friction
365 const int realfriction = (trace_dphitq3surfaceflags & Q3SURFACEFLAG_SLICK)
366 ? PHYS_FRICTION_SLICK(this)
367 : PHYS_FRICTION(this);
370 f = 1 - dt * realfriction
371 * ((f < PHYS_STOPSPEED(this)) ? (PHYS_STOPSPEED(this) / f) : 1);
375 Mathematical analysis time!
377 Our goal is to invert this mess.
379 For the two cases we get:
380 v = v0 * (1 - dt * (PHYS_STOPSPEED(this) / v0) * PHYS_FRICTION(this))
381 = v0 - dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this)
382 v0 = v + dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this)
384 v = v0 * (1 - dt * PHYS_FRICTION(this))
385 v0 = v / (1 - dt * PHYS_FRICTION(this))
387 These cases would be chosen ONLY if:
388 v0 < PHYS_STOPSPEED(this)
389 v + dt * PHYS_STOPSPEED(this) * PHYS_FRICTION(this) < PHYS_STOPSPEED(this)
390 v < PHYS_STOPSPEED(this) * (1 - dt * PHYS_FRICTION(this))
392 v0 >= PHYS_STOPSPEED(this)
393 v / (1 - dt * PHYS_FRICTION(this)) >= PHYS_STOPSPEED(this)
394 v >= PHYS_STOPSPEED(this) * (1 - dt * PHYS_FRICTION(this))
397 const float addspeed = wishspeed - this.velocity * wishdir;
399 const float accelspeed = min(PHYS_ACCELERATE(this) * dt * wishspeed, addspeed);
400 this.velocity += accelspeed * wishdir;
405 if (IS_CSQC ? PHYS_WATERJUMP_TIME(this) <= 0 : time >= PHYS_TELEPORT_TIME(this)) {
406 PM_Accelerate(this, dt, wishdir, wishspeed, wishspeed, this.com_phys_acc_rate, 1, 0, 0, 0);
411 .entity groundentity;
412 /** for other entities */
413 void sys_phys_simulate_simple(entity this, float dt)
415 vector mn = this.mins;
416 vector mx = this.maxs;
419 if (this.com_phys_gravity_factor && !g) g = '0 0 -1' * PHYS_GRAVITY(NULL);
421 vector acc = this.com_phys_acc;
422 vector vel = this.com_phys_vel;
423 vector pos = this.com_phys_pos;
429 this.angles += dt * this.avelocity;
431 for (int i = 0; i < MAX_CLIP_PLANES && movetime > 0; i++) {
432 vector push = vel * movetime;
434 vector p1 = p0 + push;
436 tracebox(p0, mn, mx, p1, MOVE_NORMAL, this);
437 if (!trace_startsolid) {
438 bool hit = trace_fraction < 1;
440 entity ent = trace_ent;
441 // SV_LinkEdict_TouchAreaGrid
442 if (this.solid != SOLID_NOT) {
443 FOREACH_ENTITY_RADIUS_ORDERED(0.5 * (this.absmin + this.absmax), 0.5 * vlen(this.absmax - this.absmin), true, {
444 if (it.solid != SOLID_TRIGGER || it == this) continue;
445 if (gettouch(it) && boxesoverlap(it.absmin, it.absmax, this.absmin, this.absmax)) {
446 // SV_LinkEdict_TouchAreaGrid_Call
447 trace_allsolid = false;
448 trace_startsolid = false;
450 trace_inwater = false;
452 trace_endpos = it.origin;
453 trace_plane_normal = '0 0 1';
454 trace_plane_dist = 0;
456 trace_dpstartcontents = 0;
457 trace_dphitcontents = 0;
458 trace_dphitq3surfaceflags = 0;
459 trace_dphittexturename = string_null;
460 gettouch(it)(this, it);
465 if (hit && this.solid >= SOLID_TRIGGER && (!IS_ONGROUND(this) || this.groundentity != ent)) {
466 // SV_Impact (ent, trace);
467 tracebox(p0, mn, mx, p1, MOVE_NORMAL, this);
468 void(entity, entity) touched = gettouch(this);
469 if (touched && this.solid != SOLID_NOT) {
472 void(entity, entity) touched2 = gettouch(ent);
473 if (this && ent && touched2 && ent.solid != SOLID_NOT) {
474 trace_endpos = ent.origin;
475 trace_plane_normal *= -1;
476 trace_plane_dist *= -1;
478 trace_dpstartcontents = 0;
479 trace_dphitcontents = 0;
480 trace_dphitq3surfaceflags = 0;
481 trace_dphittexturename = string_null;
487 if (wasfreed(this)) { return; }
488 tracebox(p0, mn, mx, p1, MOVE_NORMAL, this);
489 if (trace_fraction == 1) { break; }
490 movetime *= 1 - min(1, trace_fraction);
491 ClipVelocity(vel, trace_plane_normal, vel, 1);
494 this.com_phys_acc = acc;
495 this.com_phys_vel = vel;
496 this.com_phys_pos = pos;
497 setorigin(this, this.com_phys_pos);
500 void sys_phys_update_single(entity this)
502 sys_phys_simulate_simple(this, frametime);