ref: 3033fafd257e3dff9a8c6621076c6dc15849bafc
dir: /sv_phys.c/
#include "quakedef.h" /* pushmove objects do not obey gravity, and do not interact with each other or trigger fields, but block normal movement and push normal objects when they move. onground is set for toss objects when they come to a complete rest. it is set for steping or walking objects doors, plats, etc are SOLID_BSP, and MOVETYPE_PUSH bonus items are SOLID_TRIGGER touch, and MOVETYPE_TOSS corpses are SOLID_NOT and MOVETYPE_TOSS crates are SOLID_BBOX and MOVETYPE_TOSS walking monsters are SOLID_SLIDEBOX and MOVETYPE_STEP flying/floating monsters are SOLID_SLIDEBOX and MOVETYPE_FLY solid_edge items only clip against bsp models. */ cvar_t sv_friction = {"sv_friction","4",false,true}; cvar_t sv_stopspeed = {"sv_stopspeed","100"}; cvar_t sv_gravity = {"sv_gravity","800",false,true}; cvar_t sv_maxvelocity = {"sv_maxvelocity","2000"}; cvar_t sv_nostep = {"sv_nostep","0"}; #define MOVE_EPSILON 0.01 void SV_Physics_Toss (edict_t *ent); /* ================ SV_CheckVelocity ================ */ void SV_CheckVelocity (edict_t *ent) { int i; float wishspeed; // bound velocity for (i=0 ; i<3 ; i++) { if (isnanf(ent->v.velocity[i])) { Con_Printf ("Got a NaN velocity on %s\n", PR_Str(sv.pr, ent->v.classname)); ent->v.velocity[i] = 0; } if (isnanf(ent->v.origin[i])) { Con_Printf ("Got a NaN origin on %s\n", PR_Str(sv.pr, ent->v.classname)); ent->v.origin[i] = 0; } } wishspeed = Length(ent->v.velocity); if(wishspeed > sv_maxvelocity.value) VectorScale(ent->v.velocity, sv_maxvelocity.value/wishspeed, ent->v.velocity); } /* ============= SV_RunThink Runs thinking code if time. There is some play in the exact time the think function will be called, because it is called before any movement is done in a frame. Not used for pushmove objects, because they must be exact. Returns false if the entity removed itself. ============= */ bool SV_RunThink (edict_t *ent) { float thinktime; thinktime = ent->v.nextthink; if (thinktime <= 0 || thinktime > sv.time + host_frametime) return true; if (thinktime < sv.time) thinktime = sv.time; // don't let things stay in the past. // it is possible to start that way // by a trigger with a local time. ent->v.nextthink = 0; sv.pr->global_struct->time = thinktime; sv.pr->global_struct->self = EDICT_TO_PROG(sv.pr, ent); sv.pr->global_struct->other = EDICT_TO_PROG(sv.pr, sv.pr->edicts); PR_ExecuteProgram(sv.pr, ent->v.think); return !ent->free; } /* ================== SV_Impact Two entities have touched, so run their touch functions ================== */ void SV_Impact (edict_t *e1, edict_t *e2) { int old_self, old_other; old_self = sv.pr->global_struct->self; old_other = sv.pr->global_struct->other; sv.pr->global_struct->time = sv.time; if (e1->v.touch && e1->v.solid != SOLID_NOT) { sv.pr->global_struct->self = EDICT_TO_PROG(sv.pr, e1); sv.pr->global_struct->other = EDICT_TO_PROG(sv.pr, e2); PR_ExecuteProgram (sv.pr, e1->v.touch); } if (e2->v.touch && e2->v.solid != SOLID_NOT) { sv.pr->global_struct->self = EDICT_TO_PROG(sv.pr, e2); sv.pr->global_struct->other = EDICT_TO_PROG(sv.pr, e1); PR_ExecuteProgram (sv.pr, e2->v.touch); } sv.pr->global_struct->self = old_self; sv.pr->global_struct->other = old_other; } /* ================== ClipVelocity Slide off of the impacting object returns the blocked flags (1 = floor, 2 = step / wall) ================== */ #define STOP_EPSILON 0.1 int ClipVelocity (vec3_t in, vec3_t normal, vec3_t out, float overbounce) { float backoff; float change; int i, blocked; blocked = 0; if (normal[2] > 0) blocked |= 1; // floor if (!normal[2]) blocked |= 2; // step backoff = DotProduct (in, normal) * overbounce; for (i=0 ; i<3 ; i++) { change = normal[i]*backoff; out[i] = in[i] - change; if (out[i] > -STOP_EPSILON && out[i] < STOP_EPSILON) out[i] = 0; } return blocked; } /* ============ SV_FlyMove The basic solid body movement clip that slides along multiple planes Returns the clipflags if the velocity was modified (hit something solid) 1 = floor 2 = wall / step 4 = dead stop If steptrace is not nil, the trace of any vertical wall hit will be stored ============ */ #define MAX_CLIP_PLANES 5 int SV_FlyMove (edict_t *ent, float time, trace_t *steptrace) { int bumpcount, numbumps; vec3_t dir; float d; int numplanes; vec3_t planes[MAX_CLIP_PLANES]; vec3_t primal_velocity, original_velocity, new_velocity; int i, j; trace_t trace; vec3_t end; float time_left; int blocked; numbumps = 4; blocked = 0; VectorCopy (ent->v.velocity, original_velocity); VectorCopy (ent->v.velocity, primal_velocity); numplanes = 0; time_left = time; for (bumpcount=0 ; bumpcount<numbumps ; bumpcount++) { if (!ent->v.velocity[0] && !ent->v.velocity[1] && !ent->v.velocity[2]) break; for (i=0 ; i<3 ; i++) end[i] = ent->v.origin[i] + time_left * ent->v.velocity[i]; trace = SV_Move (ent->v.origin, ent->v.mins, ent->v.maxs, end, false, ent); if (trace.allsolid) { // entity is trapped in another solid VectorCopy (vec3_origin, ent->v.velocity); return 3; } if (trace.fraction > 0) { // actually covered some distance VectorCopy (trace.endpos, ent->v.origin); VectorCopy (ent->v.velocity, original_velocity); numplanes = 0; } if (trace.fraction == 1) break; // moved the entire distance if (!trace.ent) fatal ("SV_FlyMove: !trace.ent"); if (trace.plane.normal[2] > 0.7) { blocked |= 1; // floor if (trace.ent->v.solid == SOLID_BSP) { ent->v.flags = (int)ent->v.flags | FL_ONGROUND; ent->v.groundentity = EDICT_TO_PROG(sv.pr, trace.ent); } } if (!trace.plane.normal[2]) { blocked |= 2; // step if (steptrace) *steptrace = trace; // save for player extrafriction } // run the impact function SV_Impact (ent, trace.ent); if (ent->free) break; // removed by the impact function time_left -= time_left * trace.fraction; // cliped to another plane if (numplanes >= MAX_CLIP_PLANES) { // this shouldn't really happen VectorCopy (vec3_origin, ent->v.velocity); return 3; } VectorCopy (trace.plane.normal, planes[numplanes]); numplanes++; // modify original_velocity so it parallels all of the clip planes for (i=0 ; i<numplanes ; i++) { ClipVelocity (original_velocity, planes[i], new_velocity, 1); for (j=0 ; j<numplanes ; j++) if (j != i) { if (DotProduct (new_velocity, planes[j]) < 0) break; // not ok } if (j == numplanes) break; } if (i != numplanes) { // go along this plane VectorCopy (new_velocity, ent->v.velocity); } else { // go along the crease if (numplanes != 2) { //Con_Printf ("clip velocity, numplanes == %d\n",numplanes); VectorCopy (vec3_origin, ent->v.velocity); return 7; } CrossProduct (planes[0], planes[1], dir); VectorNormalize(dir); d = DotProduct (dir, ent->v.velocity); VectorScale (dir, d, ent->v.velocity); } // if original velocity is against the original velocity, stop dead // to avoid tiny occilations in sloping corners if (DotProduct (ent->v.velocity, primal_velocity) <= 0) { VectorCopy (vec3_origin, ent->v.velocity); return blocked; } } return blocked; } /* ============ SV_AddGravity ============ */ void SV_AddGravity (edict_t *ent) { float ent_gravity; eval_t *val; val = GetEdictFieldValue(sv.pr, ent, "gravity"); if (val && val->_float) ent_gravity = val->_float; else ent_gravity = 1.0; ent->v.velocity[2] -= ent_gravity * sv_gravity.value * host_frametime; } /* =============================================================================== PUSHMOVE =============================================================================== */ /* ============ SV_PushEntity Does not change the entities velocity at all ============ */ trace_t SV_PushEntity (edict_t *ent, vec3_t push) { trace_t trace; vec3_t end; VectorAdd (ent->v.origin, push, end); if (ent->v.movetype == MOVETYPE_FLYMISSILE) trace = SV_Move (ent->v.origin, ent->v.mins, ent->v.maxs, end, MOVE_MISSILE, ent); else if (ent->v.solid == SOLID_TRIGGER || ent->v.solid == SOLID_NOT) // only clip against bmodels trace = SV_Move (ent->v.origin, ent->v.mins, ent->v.maxs, end, MOVE_NOMONSTERS, ent); else trace = SV_Move (ent->v.origin, ent->v.mins, ent->v.maxs, end, MOVE_NORMAL, ent); VectorCopy (trace.endpos, ent->v.origin); SV_LinkEdict (ent, true); if (trace.ent) SV_Impact (ent, trace.ent); return trace; } /* ============ SV_PushMove ============ */ void SV_PushMove (edict_t *pusher, float movetime) { int i, e; edict_t *check, *block; vec3_t mins, maxs, move; vec3_t entorig, pushorig; int num_moved; static edict_t *moved_edict[MAX_EDICTS]; static vec3_t moved_from[MAX_EDICTS]; if (!pusher->v.velocity[0] && !pusher->v.velocity[1] && !pusher->v.velocity[2]) { pusher->v.ltime += movetime; return; } for (i=0 ; i<3 ; i++) { move[i] = pusher->v.velocity[i] * movetime; mins[i] = pusher->v.absmin[i] + move[i]; maxs[i] = pusher->v.absmax[i] + move[i]; } VectorCopy (pusher->v.origin, pushorig); // move the pusher to it's final position VectorAdd (pusher->v.origin, move, pusher->v.origin); pusher->v.ltime += movetime; SV_LinkEdict (pusher, false); // see if any solid entities are inside the final position num_moved = 0; check = NEXT_EDICT(sv.pr, sv.pr->edicts); for (e=1 ; e<sv.pr->num_edicts ; e++, check = NEXT_EDICT(sv.pr, check)) { if (check->free) continue; if (check->v.movetype == MOVETYPE_PUSH || check->v.movetype == MOVETYPE_NONE || check->v.movetype == MOVETYPE_NOCLIP) continue; // if the entity is standing on the pusher, it will definately be moved if ( ! ( ((int)check->v.flags & FL_ONGROUND) && PROG_TO_EDICT(sv.pr, check->v.groundentity) == pusher) ) { if ( check->v.absmin[0] >= maxs[0] || check->v.absmin[1] >= maxs[1] || check->v.absmin[2] >= maxs[2] || check->v.absmax[0] <= mins[0] || check->v.absmax[1] <= mins[1] || check->v.absmax[2] <= mins[2] ) continue; // see if the ent's bbox is inside the pusher's final position if (!SV_TestEntityPosition (check)) continue; } // remove the onground flag for non-players if (check->v.movetype != MOVETYPE_WALK) check->v.flags = (int)check->v.flags & ~FL_ONGROUND; VectorCopy (check->v.origin, entorig); VectorCopy (check->v.origin, moved_from[num_moved]); moved_edict[num_moved] = check; num_moved++; // try moving the contacted entity pusher->v.solid = SOLID_NOT; SV_PushEntity (check, move); pusher->v.solid = SOLID_BSP; // if it is still inside the pusher, block block = SV_TestEntityPosition (check); if (block) { // fail the move if (check->v.mins[0] == check->v.maxs[0]) continue; if (check->v.solid == SOLID_NOT || check->v.solid == SOLID_TRIGGER) { // corpse check->v.mins[0] = check->v.mins[1] = 0; VectorCopy (check->v.mins, check->v.maxs); continue; } VectorCopy (entorig, check->v.origin); SV_LinkEdict (check, true); VectorCopy (pushorig, pusher->v.origin); SV_LinkEdict (pusher, false); pusher->v.ltime -= movetime; // if the pusher has a "blocked" function, call it // otherwise, just stay in place until the obstacle is gone if (pusher->v.blocked) { sv.pr->global_struct->self = EDICT_TO_PROG(sv.pr, pusher); sv.pr->global_struct->other = EDICT_TO_PROG(sv.pr, check); PR_ExecuteProgram (sv.pr, pusher->v.blocked); } // move back any entities we already moved for (i=0 ; i<num_moved ; i++) { VectorCopy (moved_from[i], moved_edict[i]->v.origin); SV_LinkEdict (moved_edict[i], false); } return; } } } /* ================ SV_Physics_Pusher ================ */ void SV_Physics_Pusher (edict_t *ent) { float thinktime; float oldltime; float movetime; oldltime = ent->v.ltime; thinktime = ent->v.nextthink; if (thinktime < ent->v.ltime + host_frametime) { movetime = thinktime - ent->v.ltime; if (movetime < 0) movetime = 0; } else movetime = host_frametime; if (movetime) SV_PushMove (ent, movetime); // advances ent->v.ltime if not blocked if (thinktime > oldltime && thinktime <= ent->v.ltime) { ent->v.nextthink = 0; sv.pr->global_struct->time = sv.time; sv.pr->global_struct->self = EDICT_TO_PROG(sv.pr, ent); sv.pr->global_struct->other = EDICT_TO_PROG(sv.pr, sv.pr->edicts); PR_ExecuteProgram (sv.pr, ent->v.think); if (ent->free) return; } } /* =============================================================================== CLIENT MOVEMENT =============================================================================== */ /* ============= SV_CheckStuck This is a big hack to try and fix the rare case of getting stuck in the world clipping hull. ============= */ void SV_CheckStuck (edict_t *ent) { int i, j; int z; vec3_t org; if (!SV_TestEntityPosition(ent)) { VectorCopy (ent->v.origin, ent->v.oldorigin); return; } VectorCopy (ent->v.origin, org); VectorCopy (ent->v.oldorigin, ent->v.origin); if (!SV_TestEntityPosition(ent)) { Con_DPrintf("player unstuck\n"); SV_LinkEdict (ent, true); return; } for (z=0 ; z< 18 ; z++) for (i=-1 ; i <= 1 ; i++) for (j=-1 ; j <= 1 ; j++) { ent->v.origin[0] = org[0] + i; ent->v.origin[1] = org[1] + j; ent->v.origin[2] = org[2] + z; if (!SV_TestEntityPosition(ent)) { Con_DPrintf("player unstuck\n"); SV_LinkEdict (ent, true); return; } } VectorCopy (org, ent->v.origin); Con_DPrintf("player is stuck\n"); } /* ============= SV_CheckWater ============= */ bool SV_CheckWater (edict_t *ent) { vec3_t point; int cont; point[0] = ent->v.origin[0]; point[1] = ent->v.origin[1]; point[2] = ent->v.origin[2] + ent->v.mins[2] + 1; ent->v.waterlevel = 0; ent->v.watertype = CONTENTS_EMPTY; cont = SV_PointContents (point); if (cont <= CONTENTS_WATER) { ent->v.watertype = cont; ent->v.waterlevel = 1; point[2] = ent->v.origin[2] + (ent->v.mins[2] + ent->v.maxs[2])*0.5; cont = SV_PointContents (point); if (cont <= CONTENTS_WATER) { ent->v.waterlevel = 2; point[2] = ent->v.origin[2] + ent->v.view_ofs[2]; cont = SV_PointContents (point); if (cont <= CONTENTS_WATER) ent->v.waterlevel = 3; } } return ent->v.waterlevel > 1; } /* ============ SV_WallFriction ============ */ void SV_WallFriction (edict_t *ent, trace_t *trace) { vec3_t forward, right, up; float d, i; vec3_t into, side; AngleVectors (ent->v.v_angle, forward, right, up); d = DotProduct (trace->plane.normal, forward); d += 0.5; if (d >= 0) return; // cut the tangential velocity i = DotProduct (trace->plane.normal, ent->v.velocity); VectorScale (trace->plane.normal, i, into); VectorSubtract (ent->v.velocity, into, side); ent->v.velocity[0] = side[0] * (1 + d); ent->v.velocity[1] = side[1] * (1 + d); } /* ===================== SV_TryUnstick Player has come to a dead stop, possibly due to the problem with limited float precision at some angle joins in the BSP hull. Try fixing by pushing one pixel in each direction. This is a hack, but in the interest of good gameplay... ====================== */ int SV_TryUnstick (edict_t *ent, vec3_t oldvel) { int i; vec3_t oldorg; vec3_t dir; int clip; trace_t steptrace; VectorCopy (ent->v.origin, oldorg); VectorCopy (vec3_origin, dir); for (i=0 ; i<8 ; i++) { // try pushing a little in an axial direction switch (i) { case 0: dir[0] = 2; dir[1] = 0; break; case 1: dir[0] = 0; dir[1] = 2; break; case 2: dir[0] = -2; dir[1] = 0; break; case 3: dir[0] = 0; dir[1] = -2; break; case 4: dir[0] = 2; dir[1] = 2; break; case 5: dir[0] = -2; dir[1] = 2; break; case 6: dir[0] = 2; dir[1] = -2; break; case 7: dir[0] = -2; dir[1] = -2; break; } SV_PushEntity (ent, dir); // retry the original move ent->v.velocity[0] = oldvel[0]; ent->v. velocity[1] = oldvel[1]; ent->v. velocity[2] = 0; clip = SV_FlyMove (ent, 0.1, &steptrace); if ( fabs(oldorg[1] - ent->v.origin[1]) > 4 || fabs(oldorg[0] - ent->v.origin[0]) > 4 ) { //Con_DPrintf ("unstuck!\n"); return clip; } // go back to the original pos and try again VectorCopy (oldorg, ent->v.origin); } VectorCopy (vec3_origin, ent->v.velocity); return 7; // still not moving } /* ===================== SV_WalkMove Only used by players ====================== */ #define STEPSIZE 18 void SV_WalkMove (edict_t *ent) { vec3_t upmove, downmove; vec3_t oldorg, oldvel; vec3_t nosteporg, nostepvel; int clip; int oldonground; trace_t steptrace, downtrace; // do a regular slide move unless it looks like you ran into a step oldonground = (int)ent->v.flags & FL_ONGROUND; ent->v.flags = (int)ent->v.flags & ~FL_ONGROUND; VectorCopy (ent->v.origin, oldorg); VectorCopy (ent->v.velocity, oldvel); clip = SV_FlyMove (ent, host_frametime, &steptrace); if ( !(clip & 2) ) return; // move didn't block on a step if (!oldonground && ent->v.waterlevel == 0) return; // don't stair up while jumping if (ent->v.movetype != MOVETYPE_WALK) return; // gibbed by a trigger if (sv_nostep.value) return; if ( (int)sv_player->v.flags & FL_WATERJUMP ) return; VectorCopy (ent->v.origin, nosteporg); VectorCopy (ent->v.velocity, nostepvel); // try moving up and forward to go up a step VectorCopy (oldorg, ent->v.origin); // back to start pos VectorCopy (vec3_origin, upmove); VectorCopy (vec3_origin, downmove); upmove[2] = STEPSIZE; downmove[2] = -STEPSIZE + oldvel[2]*host_frametime; // move up SV_PushEntity (ent, upmove); // FIXME: don't link? // move forward ent->v.velocity[0] = oldvel[0]; ent->v. velocity[1] = oldvel[1]; ent->v. velocity[2] = 0; clip = SV_FlyMove (ent, host_frametime, &steptrace); // check for stuckness, possibly due to the limited precision of floats // in the clipping hulls if (clip) { if ( fabs(oldorg[1] - ent->v.origin[1]) < 0.03125 && fabs(oldorg[0] - ent->v.origin[0]) < 0.03125 ) { // stepping up didn't make any progress clip = SV_TryUnstick (ent, oldvel); } } // extra friction based on view angle if ( clip & 2 ) SV_WallFriction (ent, &steptrace); // move down downtrace = SV_PushEntity (ent, downmove); // FIXME: don't link? if (downtrace.plane.normal[2] > 0.7) { if (ent->v.solid == SOLID_BSP) { ent->v.flags = (int)ent->v.flags | FL_ONGROUND; ent->v.groundentity = EDICT_TO_PROG(sv.pr, downtrace.ent); } } else { // if the push down didn't end up on good ground, use the move without // the step up. This happens near wall / slope combinations, and can // cause the player to hop up higher on a slope too steep to climb VectorCopy (nosteporg, ent->v.origin); VectorCopy (nostepvel, ent->v.velocity); } } /* ================ SV_Physics_Client Player character actions ================ */ void SV_Physics_Client (edict_t *ent, int num) { if ( ! svs.clients[num-1].active ) return; // unconnected slot // call standard client pre-think sv.pr->global_struct->time = sv.time; sv.pr->global_struct->self = EDICT_TO_PROG(sv.pr, ent); PR_ExecuteProgram (sv.pr, sv.pr->global_struct->PlayerPreThink); // do a move SV_CheckVelocity (ent); // decide which move function to call switch ((int)ent->v.movetype) { case MOVETYPE_NONE: if (!SV_RunThink (ent)) return; break; case MOVETYPE_WALK: if (!SV_RunThink (ent)) return; if (!SV_CheckWater (ent) && ! ((int)ent->v.flags & FL_WATERJUMP) ) SV_AddGravity (ent); SV_CheckStuck (ent); SV_WalkMove (ent); break; case MOVETYPE_TOSS: case MOVETYPE_BOUNCE: SV_Physics_Toss (ent); break; case MOVETYPE_FLY: if (!SV_RunThink (ent)) return; SV_FlyMove (ent, host_frametime, nil); break; case MOVETYPE_NOCLIP: if (!SV_RunThink (ent)) return; VectorMA (ent->v.origin, host_frametime, ent->v.velocity, ent->v.origin); break; default: fatal ("SV_Physics_client: bad movetype %d", (int)ent->v.movetype); } // call standard player post-think SV_LinkEdict (ent, (int)ent->v.movetype != MOVETYPE_NOCLIP); sv.pr->global_struct->time = sv.time; sv.pr->global_struct->self = EDICT_TO_PROG(sv.pr, ent); PR_ExecuteProgram (sv.pr, sv.pr->global_struct->PlayerPostThink); } //============================================================================ /* ============= SV_Physics_None Non moving objects can only think ============= */ void SV_Physics_None (edict_t *ent) { // regular thinking SV_RunThink (ent); } /* ============= SV_Physics_Noclip A moving object that doesn't obey physics ============= */ void SV_Physics_Noclip (edict_t *ent) { // regular thinking if (!SV_RunThink (ent)) return; VectorMA (ent->v.angles, host_frametime, ent->v.avelocity, ent->v.angles); VectorMA (ent->v.origin, host_frametime, ent->v.velocity, ent->v.origin); SV_LinkEdict (ent, false); } /* ============================================================================== TOSS / BOUNCE ============================================================================== */ /* ============= SV_CheckWaterTransition ============= */ void SV_CheckWaterTransition (edict_t *ent) { int cont; cont = SV_PointContents (ent->v.origin); if (!ent->v.watertype) { // just spawned here ent->v.watertype = cont; ent->v.waterlevel = 1; return; } if (cont <= CONTENTS_WATER) { if (ent->v.watertype == CONTENTS_EMPTY) { // just crossed into water SV_StartSound (ent, 0, "misc/h2ohit1.wav", 255, 1); } ent->v.watertype = cont; ent->v.waterlevel = 1; } else { if (ent->v.watertype != CONTENTS_EMPTY) { // just crossed into water SV_StartSound (ent, 0, "misc/h2ohit1.wav", 255, 1); } ent->v.watertype = CONTENTS_EMPTY; ent->v.waterlevel = cont; } } /* ============= SV_Physics_Toss Toss, bounce, and fly movement. When onground, do nothing. ============= */ void SV_Physics_Toss (edict_t *ent) { trace_t trace; vec3_t move; float backoff; // regular thinking if (!SV_RunThink (ent)) return; // if onground, return without moving if ( ((int)ent->v.flags & FL_ONGROUND) ) return; SV_CheckVelocity (ent); // add gravity if (ent->v.movetype != MOVETYPE_FLY && ent->v.movetype != MOVETYPE_FLYMISSILE) SV_AddGravity (ent); // move angles VectorMA (ent->v.angles, host_frametime, ent->v.avelocity, ent->v.angles); // move origin VectorScale (ent->v.velocity, host_frametime, move); trace = SV_PushEntity (ent, move); if(ent->free || trace.fraction == 1) return; if(ent->v.movetype == MOVETYPE_BOUNCE) backoff = 1.5; else backoff = 1; ClipVelocity(ent->v.velocity, trace.plane.normal, ent->v.velocity, backoff); // stop if on ground if(trace.plane.normal[2] > 0.5 && DotProduct(trace.plane.normal, ent->v.velocity) < 15){ ent->v.flags = (int)ent->v.flags | FL_ONGROUND; ent->v.groundentity = EDICT_TO_PROG(sv.pr, trace.ent); ClipVelocity(ent->v.velocity, trace.plane.normal, ent->v.velocity, backoff + trace.plane.normal[2]); }else{ ent->v.flags = (int)ent->v.flags & ~FL_ONGROUND; } // check for in water SV_CheckWaterTransition (ent); } /* =============================================================================== STEPPING MOVEMENT =============================================================================== */ /* ============= SV_Physics_Step Monsters freefall when they don't have a ground entity, otherwise all movement is done with discrete steps. This is also used for objects that have become still on the ground, but will fall if the floor is pulled out from under them. ============= */ void SV_Physics_Step (edict_t *ent) { bool hitsound; // freefall if not onground if ( ! ((int)ent->v.flags & (FL_ONGROUND | FL_FLY | FL_SWIM) ) ) { if (ent->v.velocity[2] < sv_gravity.value*-0.1) hitsound = true; else hitsound = false; SV_AddGravity (ent); SV_CheckVelocity (ent); SV_FlyMove (ent, host_frametime, nil); SV_LinkEdict (ent, true); if ( (int)ent->v.flags & FL_ONGROUND ) // just hit ground { if (hitsound) SV_StartSound (ent, 0, "demon/dland2.wav", 255, 1); } } // regular thinking SV_RunThink (ent); SV_CheckWaterTransition (ent); } //============================================================================ /* ================ SV_Physics ================ */ void SV_Physics (void) { int i; edict_t *ent; // let the progs know that a new frame has started sv.pr->global_struct->self = EDICT_TO_PROG(sv.pr, sv.pr->edicts); sv.pr->global_struct->other = EDICT_TO_PROG(sv.pr, sv.pr->edicts); sv.pr->global_struct->time = sv.time; PR_ExecuteProgram (sv.pr, sv.pr->global_struct->StartFrame); // treat each object in turn ent = sv.pr->edicts; for (i=0 ; i<sv.pr->num_edicts ; i++, ent = NEXT_EDICT(sv.pr, ent)) { if (ent->free) continue; if (sv.pr->global_struct->force_retouch) { SV_LinkEdict (ent, true); // force retouch even for stationary } if (i > 0 && i <= svs.maxclients) SV_Physics_Client (ent, i); else if (ent->v.movetype == MOVETYPE_PUSH) SV_Physics_Pusher (ent); else if (ent->v.movetype == MOVETYPE_NONE) SV_Physics_None (ent); else if (ent->v.movetype == MOVETYPE_NOCLIP) SV_Physics_Noclip (ent); else if (ent->v.movetype == MOVETYPE_STEP) SV_Physics_Step (ent); else if (ent->v.movetype == MOVETYPE_TOSS || ent->v.movetype == MOVETYPE_BOUNCE || ent->v.movetype == MOVETYPE_FLY || ent->v.movetype == MOVETYPE_FLYMISSILE) SV_Physics_Toss (ent); else fatal ("SV_Physics: bad movetype %d", (int)ent->v.movetype); } if (sv.pr->global_struct->force_retouch) sv.pr->global_struct->force_retouch--; sv.time += host_frametime; }