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- /*
- 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.
- */
- #include "client.h"
- /*
- ===================
- CL_CheckPredictionError
- ===================
- */
- void CL_CheckPredictionError (void)
- {
- int frame;
- int delta[3];
- int i;
- int len;
- if (!cl_predict->value || (cl.frame.playerstate.pmove.pm_flags & PMF_NO_PREDICTION))
- return;
- // calculate the last usercmd_t we sent that the server has processed
- frame = cls.netchan.incoming_acknowledged;
- frame &= (CMD_BACKUP-1);
- // compare what the server returned with what we had predicted it to be
- VectorSubtract (cl.frame.playerstate.pmove.origin, cl.predicted_origins[frame], delta);
- // save the prediction error for interpolation
- len = abs(delta[0]) + abs(delta[1]) + abs(delta[2]);
- if (len > 640) // 80 world units
- { // a teleport or something
- VectorClear (cl.prediction_error);
- }
- else
- {
- if (cl_showmiss->value && (delta[0] || delta[1] || delta[2]) )
- Com_Printf ("prediction miss on %i: %i\n", cl.frame.serverframe,
- delta[0] + delta[1] + delta[2]);
- VectorCopy (cl.frame.playerstate.pmove.origin, cl.predicted_origins[frame]);
- // save for error itnerpolation
- for (i=0 ; i<3 ; i++)
- cl.prediction_error[i] = delta[i]*0.125;
- }
- }
- /*
- ====================
- CL_ClipMoveToEntities
- ====================
- */
- void CL_ClipMoveToEntities ( vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end, trace_t *tr )
- {
- int i, x, zd, zu;
- trace_t trace;
- int headnode;
- float *angles;
- entity_state_t *ent;
- int num;
- cmodel_t *cmodel;
- vec3_t bmins, bmaxs;
- for (i=0 ; i<cl.frame.num_entities ; i++)
- {
- num = (cl.frame.parse_entities + i)&(MAX_PARSE_ENTITIES-1);
- ent = &cl_parse_entities[num];
- if (!ent->solid)
- continue;
- if (ent->number == cl.playernum+1)
- continue;
- if (ent->solid == 31)
- { // special value for bmodel
- cmodel = cl.model_clip[ent->modelindex];
- if (!cmodel)
- continue;
- headnode = cmodel->headnode;
- angles = ent->angles;
- }
- else
- { // encoded bbox
- x = 8*(ent->solid & 31);
- zd = 8*((ent->solid>>5) & 31);
- zu = 8*((ent->solid>>10) & 63) - 32;
- bmins[0] = bmins[1] = -x;
- bmaxs[0] = bmaxs[1] = x;
- bmins[2] = -zd;
- bmaxs[2] = zu;
- headnode = CM_HeadnodeForBox (bmins, bmaxs);
- angles = vec3_origin; // boxes don't rotate
- }
- if (tr->allsolid)
- return;
- trace = CM_TransformedBoxTrace (start, end,
- mins, maxs, headnode, MASK_PLAYERSOLID,
- ent->origin, angles);
- if (trace.allsolid || trace.startsolid ||
- trace.fraction < tr->fraction)
- {
- trace.ent = (struct edict_s *)ent;
- if (tr->startsolid)
- {
- *tr = trace;
- tr->startsolid = true;
- }
- else
- *tr = trace;
- }
- else if (trace.startsolid)
- tr->startsolid = true;
- }
- }
- /*
- ================
- CL_PMTrace
- ================
- */
- trace_t CL_PMTrace (vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end)
- {
- trace_t t;
- // check against world
- t = CM_BoxTrace (start, end, mins, maxs, 0, MASK_PLAYERSOLID);
- if (t.fraction < 1.0)
- t.ent = (struct edict_s *)1;
- // check all other solid models
- CL_ClipMoveToEntities (start, mins, maxs, end, &t);
- return t;
- }
- int CL_PMpointcontents (vec3_t point)
- {
- int i;
- entity_state_t *ent;
- int num;
- cmodel_t *cmodel;
- int contents;
- contents = CM_PointContents (point, 0);
- for (i=0 ; i<cl.frame.num_entities ; i++)
- {
- num = (cl.frame.parse_entities + i)&(MAX_PARSE_ENTITIES-1);
- ent = &cl_parse_entities[num];
- if (ent->solid != 31) // special value for bmodel
- continue;
- cmodel = cl.model_clip[ent->modelindex];
- if (!cmodel)
- continue;
- contents |= CM_TransformedPointContents (point, cmodel->headnode, ent->origin, ent->angles);
- }
- return contents;
- }
- /*
- =================
- CL_PredictMovement
- Sets cl.predicted_origin and cl.predicted_angles
- =================
- */
- void CL_PredictMovement (void)
- {
- int ack, current;
- int frame;
- int oldframe;
- usercmd_t *cmd;
- pmove_t pm;
- int i;
- int step;
- int oldz;
- if (cls.state != ca_active)
- return;
- if (cl_paused->value)
- return;
- if (!cl_predict->value || (cl.frame.playerstate.pmove.pm_flags & PMF_NO_PREDICTION))
- { // just set angles
- for (i=0 ; i<3 ; i++)
- {
- cl.predicted_angles[i] = cl.viewangles[i] + SHORT2ANGLE(cl.frame.playerstate.pmove.delta_angles[i]);
- }
- return;
- }
- ack = cls.netchan.incoming_acknowledged;
- current = cls.netchan.outgoing_sequence;
- // if we are too far out of date, just freeze
- if (current - ack >= CMD_BACKUP)
- {
- if (cl_showmiss->value)
- Com_Printf ("exceeded CMD_BACKUP\n");
- return;
- }
- // copy current state to pmove
- memset (&pm, 0, sizeof(pm));
- pm.trace = CL_PMTrace;
- pm.pointcontents = CL_PMpointcontents;
- pm_airaccelerate = atof(cl.configstrings[CS_AIRACCEL]);
- pm.s = cl.frame.playerstate.pmove;
- // SCR_DebugGraph (current - ack - 1, 0);
- frame = 0;
- // run frames
- while (++ack < current)
- {
- frame = ack & (CMD_BACKUP-1);
- cmd = &cl.cmds[frame];
- pm.cmd = *cmd;
- Pmove (&pm);
- // save for debug checking
- VectorCopy (pm.s.origin, cl.predicted_origins[frame]);
- }
- oldframe = (ack-2) & (CMD_BACKUP-1);
- oldz = cl.predicted_origins[oldframe][2];
- step = pm.s.origin[2] - oldz;
- if (step > 63 && step < 160 && (pm.s.pm_flags & PMF_ON_GROUND) )
- {
- cl.predicted_step = step * 0.125;
- cl.predicted_step_time = cls.realtime - cls.frametime * 500;
- }
- // copy results out for rendering
- cl.predicted_origin[0] = pm.s.origin[0]*0.125;
- cl.predicted_origin[1] = pm.s.origin[1]*0.125;
- cl.predicted_origin[2] = pm.s.origin[2]*0.125;
- VectorCopy (pm.viewangles, cl.predicted_angles);
- }
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