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The original Quake 2 sources as originally released under the GPL license on December 21, 2001.
This commit is contained in:
Travis Bradshaw
278
client/cl_pred.c
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278
client/cl_pred.c
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/*
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Copyright (C) 1997-2001 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "client.h"
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/*
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===================
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CL_CheckPredictionError
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===================
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*/
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void CL_CheckPredictionError (void)
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{
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int frame;
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int delta[3];
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int i;
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int len;
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if (!cl_predict->value || (cl.frame.playerstate.pmove.pm_flags & PMF_NO_PREDICTION))
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return;
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// calculate the last usercmd_t we sent that the server has processed
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frame = cls.netchan.incoming_acknowledged;
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frame &= (CMD_BACKUP-1);
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// compare what the server returned with what we had predicted it to be
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VectorSubtract (cl.frame.playerstate.pmove.origin, cl.predicted_origins[frame], delta);
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// save the prediction error for interpolation
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len = abs(delta[0]) + abs(delta[1]) + abs(delta[2]);
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if (len > 640) // 80 world units
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{ // a teleport or something
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VectorClear (cl.prediction_error);
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}
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else
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{
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if (cl_showmiss->value && (delta[0] || delta[1] || delta[2]) )
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Com_Printf ("prediction miss on %i: %i\n", cl.frame.serverframe,
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delta[0] + delta[1] + delta[2]);
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VectorCopy (cl.frame.playerstate.pmove.origin, cl.predicted_origins[frame]);
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// save for error itnerpolation
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for (i=0 ; i<3 ; i++)
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cl.prediction_error[i] = delta[i]*0.125;
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}
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}
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/*
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====================
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CL_ClipMoveToEntities
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====================
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*/
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void CL_ClipMoveToEntities ( vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end, trace_t *tr )
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{
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int i, x, zd, zu;
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trace_t trace;
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int headnode;
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float *angles;
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entity_state_t *ent;
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int num;
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cmodel_t *cmodel;
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vec3_t bmins, bmaxs;
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for (i=0 ; i<cl.frame.num_entities ; i++)
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{
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num = (cl.frame.parse_entities + i)&(MAX_PARSE_ENTITIES-1);
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ent = &cl_parse_entities[num];
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if (!ent->solid)
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continue;
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if (ent->number == cl.playernum+1)
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continue;
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if (ent->solid == 31)
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{ // special value for bmodel
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cmodel = cl.model_clip[ent->modelindex];
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if (!cmodel)
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continue;
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headnode = cmodel->headnode;
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angles = ent->angles;
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}
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else
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{ // encoded bbox
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x = 8*(ent->solid & 31);
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zd = 8*((ent->solid>>5) & 31);
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zu = 8*((ent->solid>>10) & 63) - 32;
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bmins[0] = bmins[1] = -x;
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bmaxs[0] = bmaxs[1] = x;
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bmins[2] = -zd;
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bmaxs[2] = zu;
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headnode = CM_HeadnodeForBox (bmins, bmaxs);
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angles = vec3_origin; // boxes don't rotate
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}
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if (tr->allsolid)
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return;
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trace = CM_TransformedBoxTrace (start, end,
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mins, maxs, headnode, MASK_PLAYERSOLID,
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ent->origin, angles);
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if (trace.allsolid || trace.startsolid ||
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trace.fraction < tr->fraction)
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{
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trace.ent = (struct edict_s *)ent;
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if (tr->startsolid)
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{
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*tr = trace;
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tr->startsolid = true;
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}
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else
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*tr = trace;
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}
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else if (trace.startsolid)
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tr->startsolid = true;
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}
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}
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/*
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================
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CL_PMTrace
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================
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*/
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trace_t CL_PMTrace (vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end)
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{
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trace_t t;
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// check against world
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t = CM_BoxTrace (start, end, mins, maxs, 0, MASK_PLAYERSOLID);
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if (t.fraction < 1.0)
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t.ent = (struct edict_s *)1;
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// check all other solid models
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CL_ClipMoveToEntities (start, mins, maxs, end, &t);
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return t;
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}
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int CL_PMpointcontents (vec3_t point)
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{
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int i;
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entity_state_t *ent;
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int num;
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cmodel_t *cmodel;
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int contents;
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contents = CM_PointContents (point, 0);
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for (i=0 ; i<cl.frame.num_entities ; i++)
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{
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num = (cl.frame.parse_entities + i)&(MAX_PARSE_ENTITIES-1);
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ent = &cl_parse_entities[num];
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if (ent->solid != 31) // special value for bmodel
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continue;
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cmodel = cl.model_clip[ent->modelindex];
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if (!cmodel)
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continue;
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contents |= CM_TransformedPointContents (point, cmodel->headnode, ent->origin, ent->angles);
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}
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return contents;
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}
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/*
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=================
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CL_PredictMovement
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Sets cl.predicted_origin and cl.predicted_angles
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=================
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*/
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void CL_PredictMovement (void)
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{
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int ack, current;
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int frame;
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int oldframe;
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usercmd_t *cmd;
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pmove_t pm;
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int i;
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int step;
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int oldz;
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if (cls.state != ca_active)
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return;
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if (cl_paused->value)
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return;
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if (!cl_predict->value || (cl.frame.playerstate.pmove.pm_flags & PMF_NO_PREDICTION))
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{ // just set angles
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for (i=0 ; i<3 ; i++)
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{
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cl.predicted_angles[i] = cl.viewangles[i] + SHORT2ANGLE(cl.frame.playerstate.pmove.delta_angles[i]);
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}
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return;
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}
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ack = cls.netchan.incoming_acknowledged;
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current = cls.netchan.outgoing_sequence;
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// if we are too far out of date, just freeze
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if (current - ack >= CMD_BACKUP)
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{
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if (cl_showmiss->value)
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Com_Printf ("exceeded CMD_BACKUP\n");
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return;
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}
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// copy current state to pmove
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memset (&pm, 0, sizeof(pm));
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pm.trace = CL_PMTrace;
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pm.pointcontents = CL_PMpointcontents;
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pm_airaccelerate = atof(cl.configstrings[CS_AIRACCEL]);
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pm.s = cl.frame.playerstate.pmove;
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// SCR_DebugGraph (current - ack - 1, 0);
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frame = 0;
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// run frames
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while (++ack < current)
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{
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frame = ack & (CMD_BACKUP-1);
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cmd = &cl.cmds[frame];
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pm.cmd = *cmd;
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Pmove (&pm);
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// save for debug checking
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VectorCopy (pm.s.origin, cl.predicted_origins[frame]);
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}
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oldframe = (ack-2) & (CMD_BACKUP-1);
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oldz = cl.predicted_origins[oldframe][2];
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step = pm.s.origin[2] - oldz;
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if (step > 63 && step < 160 && (pm.s.pm_flags & PMF_ON_GROUND) )
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{
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cl.predicted_step = step * 0.125;
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cl.predicted_step_time = cls.realtime - cls.frametime * 500;
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}
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// copy results out for rendering
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cl.predicted_origin[0] = pm.s.origin[0]*0.125;
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cl.predicted_origin[1] = pm.s.origin[1]*0.125;
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cl.predicted_origin[2] = pm.s.origin[2]*0.125;
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VectorCopy (pm.viewangles, cl.predicted_angles);
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}
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