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Diffstat (limited to 'source/baseq2/m_move.c')
| -rw-r--r-- | source/baseq2/m_move.c | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/source/baseq2/m_move.c b/source/baseq2/m_move.c new file mode 100644 index 0000000..02a11fe --- /dev/null +++ b/source/baseq2/m_move.c @@ -0,0 +1,556 @@ +/* +Copyright (C) 1997-2001 Id Software, Inc. + +This program is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License +as published by the Free Software Foundation; either version 2 +of the License, or (at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + +See the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +*/ +// m_move.c -- monster movement + +#include "g_local.h" + +#define STEPSIZE 18 + +/* +============= +M_CheckBottom + +Returns qfalse if any part of the bottom of the entity is off an edge that +is not a staircase. + +============= +*/ +int c_yes, c_no; + +qboolean M_CheckBottom (edict_t *ent) +{ + vec3_t mins, maxs, start, stop; + trace_t trace; + int x, y; + float mid, bottom; + + VectorAdd (ent->s.origin, ent->mins, mins); + VectorAdd (ent->s.origin, ent->maxs, maxs); + +// if all of the points under the corners are solid world, don't bother +// with the tougher checks +// the corners must be within 16 of the midpoint + start[2] = mins[2] - 1; + for (x=0 ; x<=1 ; x++) + for (y=0 ; y<=1 ; y++) + { + start[0] = x ? maxs[0] : mins[0]; + start[1] = y ? maxs[1] : mins[1]; + if (gi.pointcontents (start) != CONTENTS_SOLID) + goto realcheck; + } + + c_yes++; + return qtrue; // we got out easy + +realcheck: + c_no++; +// +// check it for real... +// + start[2] = mins[2]; + +// the midpoint must be within 16 of the bottom + start[0] = stop[0] = (mins[0] + maxs[0])*0.5; + start[1] = stop[1] = (mins[1] + maxs[1])*0.5; + stop[2] = start[2] - 2*STEPSIZE; + trace = gi.trace (start, vec3_origin, vec3_origin, stop, ent, MASK_MONSTERSOLID); + + if (trace.fraction == 1.0) + return qfalse; + mid = bottom = trace.endpos[2]; + +// the corners must be within 16 of the midpoint + for (x=0 ; x<=1 ; x++) + for (y=0 ; y<=1 ; y++) + { + start[0] = stop[0] = x ? maxs[0] : mins[0]; + start[1] = stop[1] = y ? maxs[1] : mins[1]; + + trace = gi.trace (start, vec3_origin, vec3_origin, stop, ent, MASK_MONSTERSOLID); + + if (trace.fraction != 1.0 && trace.endpos[2] > bottom) + bottom = trace.endpos[2]; + if (trace.fraction == 1.0 || mid - trace.endpos[2] > STEPSIZE) + return qfalse; + } + + c_yes++; + return qtrue; +} + + +/* +============= +SV_movestep + +Called by monster program code. +The move will be adjusted for slopes and stairs, but if the move isn't +possible, no move is done, qfalse is returned, and +pr_global_struct->trace_normal is set to the normal of the blocking wall +============= +*/ +//FIXME since we need to test end position contents here, can we avoid doing +//it again later in catagorize position? +qboolean SV_movestep (edict_t *ent, vec3_t move, qboolean relink) +{ + float dz; + vec3_t oldorg, neworg, end; + trace_t trace; + int i; + float stepsize; + vec3_t test; + int contents; + +// try the move + VectorCopy (ent->s.origin, oldorg); + VectorAdd (ent->s.origin, move, neworg); + +// flying monsters don't step up + if ( ent->flags & (FL_SWIM | FL_FLY) ) + { + // try one move with vertical motion, then one without + for (i=0 ; i<2 ; i++) + { + VectorAdd (ent->s.origin, move, neworg); + if (i == 0 && ent->enemy) + { + if (!ent->goalentity) + ent->goalentity = ent->enemy; + dz = ent->s.origin[2] - ent->goalentity->s.origin[2]; + if (ent->goalentity->client) + { + if (dz > 40) + neworg[2] -= 8; + if (!((ent->flags & FL_SWIM) && (ent->waterlevel < 2))) + if (dz < 30) + neworg[2] += 8; + } + else + { + if (dz > 8) + neworg[2] -= 8; + else if (dz > 0) + neworg[2] -= dz; + else if (dz < -8) + neworg[2] += 8; + else + neworg[2] += dz; + } + } + trace = gi.trace (ent->s.origin, ent->mins, ent->maxs, neworg, ent, MASK_MONSTERSOLID); + + // fly monsters don't enter water voluntarily + if (ent->flags & FL_FLY) + { + if (!ent->waterlevel) + { + test[0] = trace.endpos[0]; + test[1] = trace.endpos[1]; + test[2] = trace.endpos[2] + ent->mins[2] + 1; + contents = gi.pointcontents(test); + if (contents & MASK_WATER) + return qfalse; + } + } + + // swim monsters don't exit water voluntarily + if (ent->flags & FL_SWIM) + { + if (ent->waterlevel < 2) + { + test[0] = trace.endpos[0]; + test[1] = trace.endpos[1]; + test[2] = trace.endpos[2] + ent->mins[2] + 1; + contents = gi.pointcontents(test); + if (!(contents & MASK_WATER)) + return qfalse; + } + } + + if (trace.fraction == 1) + { + VectorCopy (trace.endpos, ent->s.origin); + if (relink) + { + gi.linkentity (ent); + G_TouchTriggers (ent); + } + return qtrue; + } + + if (!ent->enemy) + break; + } + + return qfalse; + } + +// push down from a step height above the wished position + if (!(ent->monsterinfo.aiflags & AI_NOSTEP)) + stepsize = STEPSIZE; + else + stepsize = 1; + + neworg[2] += stepsize; + VectorCopy (neworg, end); + end[2] -= stepsize*2; + + trace = gi.trace (neworg, ent->mins, ent->maxs, end, ent, MASK_MONSTERSOLID); + + if (trace.allsolid) + return qfalse; + + if (trace.startsolid) + { + neworg[2] -= stepsize; + trace = gi.trace (neworg, ent->mins, ent->maxs, end, ent, MASK_MONSTERSOLID); + if (trace.allsolid || trace.startsolid) + return qfalse; + } + + + // don't go in to water + if (ent->waterlevel == 0) + { + test[0] = trace.endpos[0]; + test[1] = trace.endpos[1]; + test[2] = trace.endpos[2] + ent->mins[2] + 1; + contents = gi.pointcontents(test); + + if (contents & MASK_WATER) + return qfalse; + } + + if (trace.fraction == 1) + { + // if monster had the ground pulled out, go ahead and fall + if ( ent->flags & FL_PARTIALGROUND ) + { + VectorAdd (ent->s.origin, move, ent->s.origin); + if (relink) + { + gi.linkentity (ent); + G_TouchTriggers (ent); + } + ent->groundentity = NULL; + return qtrue; + } + + return qfalse; // walked off an edge + } + +// check point traces down for dangling corners + VectorCopy (trace.endpos, ent->s.origin); + + if (!M_CheckBottom (ent)) + { + if ( ent->flags & FL_PARTIALGROUND ) + { // entity had floor mostly pulled out from underneath it + // and is trying to correct + if (relink) + { + gi.linkentity (ent); + G_TouchTriggers (ent); + } + return qtrue; + } + VectorCopy (oldorg, ent->s.origin); + return qfalse; + } + + if ( ent->flags & FL_PARTIALGROUND ) + { + ent->flags &= ~FL_PARTIALGROUND; + } + ent->groundentity = trace.ent; + ent->groundentity_linkcount = trace.ent->linkcount; + +// the move is ok + if (relink) + { + gi.linkentity (ent); + G_TouchTriggers (ent); + } + return qtrue; +} + + +//============================================================================ + +/* +=============== +M_ChangeYaw + +=============== +*/ +void M_ChangeYaw (edict_t *ent) +{ + float ideal; + float current; + float move; + float speed; + + current = anglemod(ent->s.angles[YAW]); + ideal = ent->ideal_yaw; + + if (current == ideal) + return; + + move = ideal - current; + speed = ent->yaw_speed; + if (ideal > current) + { + if (move >= 180) + move = move - 360; + } + else + { + if (move <= -180) + move = move + 360; + } + if (move > 0) + { + if (move > speed) + move = speed; + } + else + { + if (move < -speed) + move = -speed; + } + + ent->s.angles[YAW] = anglemod (current + move); +} + + +/* +====================== +SV_StepDirection + +Turns to the movement direction, and walks the current distance if +facing it. + +====================== +*/ +qboolean SV_StepDirection (edict_t *ent, float yaw, float dist) +{ + vec3_t move, oldorigin; + float delta; + + ent->ideal_yaw = yaw; + M_ChangeYaw (ent); + + yaw = yaw*M_PI*2 / 360; + move[0] = cos(yaw)*dist; + move[1] = sin(yaw)*dist; + move[2] = 0; + + VectorCopy (ent->s.origin, oldorigin); + if (SV_movestep (ent, move, qfalse)) + { + delta = ent->s.angles[YAW] - ent->ideal_yaw; + if (delta > 45 && delta < 315) + { // not turned far enough, so don't take the step + VectorCopy (oldorigin, ent->s.origin); + } + gi.linkentity (ent); + G_TouchTriggers (ent); + return qtrue; + } + gi.linkentity (ent); + G_TouchTriggers (ent); + return qfalse; +} + +/* +====================== +SV_FixCheckBottom + +====================== +*/ +void SV_FixCheckBottom (edict_t *ent) +{ + ent->flags |= FL_PARTIALGROUND; +} + + + +/* +================ +SV_NewChaseDir + +================ +*/ +#define DI_NODIR -1 +void SV_NewChaseDir (edict_t *actor, edict_t *enemy, float dist) +{ + float deltax,deltay; + float d[3]; + float tdir, olddir, turnaround; + + //FIXME: how did we get here with no enemy + if (!enemy) + return; + + olddir = anglemod( (int)(actor->ideal_yaw/45)*45 ); + turnaround = anglemod(olddir - 180); + + deltax = enemy->s.origin[0] - actor->s.origin[0]; + deltay = enemy->s.origin[1] - actor->s.origin[1]; + if (deltax>10) + d[1]= 0; + else if (deltax<-10) + d[1]= 180; + else + d[1]= DI_NODIR; + if (deltay<-10) + d[2]= 270; + else if (deltay>10) + d[2]= 90; + else + d[2]= DI_NODIR; + +// try direct route + if (d[1] != DI_NODIR && d[2] != DI_NODIR) + { + if (d[1] == 0) + tdir = d[2] == 90 ? 45 : 315; + else + tdir = d[2] == 90 ? 135 : 215; + + if (tdir != turnaround && SV_StepDirection(actor, tdir, dist)) + return; + } + +// try other directions + if ( ((rand()&3) & 1) || abs(deltay)>abs(deltax)) + { + tdir=d[1]; + d[1]=d[2]; + d[2]=tdir; + } + + if (d[1]!=DI_NODIR && d[1]!=turnaround + && SV_StepDirection(actor, d[1], dist)) + return; + + if (d[2]!=DI_NODIR && d[2]!=turnaround + && SV_StepDirection(actor, d[2], dist)) + return; + +/* there is no direct path to the player, so pick another direction */ + + if (olddir!=DI_NODIR && SV_StepDirection(actor, olddir, dist)) + return; + + if (rand()&1) /*randomly determine direction of search*/ + { + for (tdir=0 ; tdir<=315 ; tdir += 45) + if (tdir!=turnaround && SV_StepDirection(actor, tdir, dist) ) + return; + } + else + { + for (tdir=315 ; tdir >=0 ; tdir -= 45) + if (tdir!=turnaround && SV_StepDirection(actor, tdir, dist) ) + return; + } + + if (turnaround != DI_NODIR && SV_StepDirection(actor, turnaround, dist) ) + return; + + actor->ideal_yaw = olddir; // can't move + +// if a bridge was pulled out from underneath a monster, it may not have +// a valid standing position at all + + if (!M_CheckBottom (actor)) + SV_FixCheckBottom (actor); +} + +/* +====================== +SV_CloseEnough + +====================== +*/ +qboolean SV_CloseEnough (edict_t *ent, edict_t *goal, float dist) +{ + int i; + + for (i=0 ; i<3 ; i++) + { + if (goal->absmin[i] > ent->absmax[i] + dist) + return qfalse; + if (goal->absmax[i] < ent->absmin[i] - dist) + return qfalse; + } + return qtrue; +} + + +/* +====================== +M_MoveToGoal +====================== +*/ +void M_MoveToGoal (edict_t *ent, float dist) +{ + edict_t *goal; + + goal = ent->goalentity; + + if (!ent->groundentity && !(ent->flags & (FL_FLY|FL_SWIM))) + return; + +// if the next step hits the enemy, return immediately + if (ent->enemy && SV_CloseEnough (ent, ent->enemy, dist) ) + return; + +// bump around... + if ( (rand()&3)==1 || !SV_StepDirection (ent, ent->ideal_yaw, dist)) + { + if (ent->inuse) + SV_NewChaseDir (ent, goal, dist); + } +} + + +/* +=============== +M_walkmove +=============== +*/ +qboolean M_walkmove (edict_t *ent, float yaw, float dist) +{ + vec3_t move; + + if (!ent->groundentity && !(ent->flags & (FL_FLY|FL_SWIM))) + return qfalse; + + yaw = yaw*M_PI*2 / 360; + + move[0] = cos(yaw)*dist; + move[1] = sin(yaw)*dist; + move[2] = 0; + + return SV_movestep(ent, move, qtrue); +} |