simu.cpp

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/***************************************************************************

    file                 : simu.cpp
    created              : Sun Mar 19 00:07:53 CET 2000
    copyright            : (C) 2000-2017 by Eric Espie, Bernhard Wymann
    email                : torcs@free.fr
    version              : $Id$

 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <memory.h>
#include <math.h>
#ifdef WIN32
#include <windows.h>
#include <float.h>
#define isnan _isnan
#endif

#include <tgf.h>
#include <robottools.h>
#include "sim.h"

tCar *SimCarTable = 0;
tdble SimDeltaTime;
int SimTelemetry;
static int SimNbCars = 0;

tdble rulesFuelFactor = 1.0f;
tdble rulesDamageFactor = 1.0f;
tdble rulesTireFactor = 0.0f;

/*
 * Check the input control from robots
 */
static void
ctrlCheck(tCar *car)
{
    tTransmission   *trans = &(car->transmission);
    tClutch     *clutch = &(trans->clutch);

    /* sanity check */
#if defined WIN32 || defined sun
    if (isnan(car->ctrl->accelCmd)) car->ctrl->accelCmd = 0;
    if (isnan(car->ctrl->brakeCmd)) car->ctrl->brakeCmd = 0;
    if (isnan(car->ctrl->clutchCmd)) car->ctrl->clutchCmd = 0;
    if (isnan(car->ctrl->steer)) car->ctrl->steer = 0;
#else
    if (isnan(car->ctrl->accelCmd) || isinf(car->ctrl->accelCmd)) car->ctrl->accelCmd = 0;
    if (isnan(car->ctrl->brakeCmd) || isinf(car->ctrl->brakeCmd)) car->ctrl->brakeCmd = 0;
    if (isnan(car->ctrl->clutchCmd) || isinf(car->ctrl->clutchCmd)) car->ctrl->clutchCmd = 0;
    if (isnan(car->ctrl->steer) || isinf(car->ctrl->steer)) car->ctrl->steer = 0;
#endif

    /* When the car is broken try to send it on the track side */
    if (car->carElt->_state & RM_CAR_STATE_BROKEN) {
    car->ctrl->accelCmd = 0.0f;
    car->ctrl->brakeCmd = 0.1f;
    car->ctrl->gear = 0;
    if (car->trkPos.toRight >  car->trkPos.seg->width / 2.0) {
        car->ctrl->steer = 0.1f;
    } else {
        car->ctrl->steer = -0.1f;
    }
    } else if (car->carElt->_state & RM_CAR_STATE_ELIMINATED) {
    car->ctrl->accelCmd = 0.0f;
    car->ctrl->brakeCmd = 0.1f;
    car->ctrl->gear = 0;
    if (car->trkPos.toRight >  car->trkPos.seg->width / 2.0) {
        car->ctrl->steer = 0.1f;
    } else {
        car->ctrl->steer = -0.1f;
    }
    } else if (car->carElt->_state & RM_CAR_STATE_FINISH) {
    /* when the finish line is passed, continue at "slow" pace */
    car->ctrl->accelCmd = MIN(car->ctrl->accelCmd, 0.20);
    if (car->DynGC.vel.x > 30.0) {
        car->ctrl->brakeCmd = MAX(car->ctrl->brakeCmd, 0.05);
    }
    }

    /* check boundaries */
    if (car->ctrl->accelCmd > 1.0) {
    car->ctrl->accelCmd = 1.0;
    } else if (car->ctrl->accelCmd < 0.0) {
    car->ctrl->accelCmd = 0.0;
    }
    if (car->ctrl->brakeCmd > 1.0) {
    car->ctrl->brakeCmd = 1.0;
    } else if (car->ctrl->brakeCmd < 0.0) {
    car->ctrl->brakeCmd = 0.0;
    }
    if (car->ctrl->clutchCmd > 1.0) {
    car->ctrl->clutchCmd = 1.0;
    } else if (car->ctrl->clutchCmd < 0.0) {
    car->ctrl->clutchCmd = 0.0;
    }
    if (car->ctrl->steer > 1.0) {
    car->ctrl->steer = 1.0;
    } else if (car->ctrl->steer < -1.0) {
    car->ctrl->steer = -1.0;
    }

    clutch->transferValue = 1.0 - car->ctrl->clutchCmd;
}

/* Initial configuration */
void
SimConfig(tCarElt *carElt, RmInfo *info)
{
    tCar *car = &(SimCarTable[carElt->index]);

    memset(car, 0, sizeof(tCar));

    car->carElt = carElt;
    car->DynGCg = car->DynGC = carElt->_DynGC;
    car->trkPos = carElt->_trkPos;
    car->ctrl   = &carElt->ctrl;
    car->params = carElt->_carHandle;

    SimCarConfig(car);

    SimCarCollideConfig(car, info->track);
    sgMakeCoordMat4(carElt->pub.posMat, carElt->_pos_X, carElt->_pos_Y, carElt->_pos_Z - carElt->_statGC_z,
            RAD2DEG(carElt->_yaw), RAD2DEG(carElt->_roll), RAD2DEG(carElt->_pitch));
}

/* After pit stop */
void SimReConfig(tCarElt *carElt)
{
    tCar *car = &(SimCarTable[carElt->index]);
    if (carElt->pitcmd.fuel > 0) {
        car->fuel += carElt->pitcmd.fuel;
        if (car->fuel > car->tank) car->fuel = car->tank;
    }

    if (carElt->pitcmd.repair > 0) {
        car->dammage -= carElt->pitcmd.repair;
        if (car->dammage < 0) car->dammage = 0;
    }

    int i;
    SimSteerReConfig(car);
    SimBrakeSystemReConfig(car);
    
    for (i = 0; i < 2; i++) {
        SimWingReConfig(car, i);
        SimAxleReConfig(car, i);
    }

    for (i = 0; i < 4; i++) {
        SimWheelReConfig(car, i);
        if (carElt->pitcmd.tireChange == tCarPitCmd::ALL) {
            SimWheelResetWear(car, i);
        }
    }

    SimTransmissionReConfig(car);
}


static void
RemoveCar(tCar *car, tSituation *s)
{
    int i;
    tCarElt *carElt;
    tTrkLocPos trkPos;
    int trkFlag;
    tdble travelTime;
    tdble dang;

    static tdble PULL_Z_OFFSET = 3.0;
    static tdble PULL_SPD = 0.5;

    carElt = car->carElt;

    if (carElt->_state & RM_CAR_STATE_PULLUP) {
        carElt->_pos_Z += car->restPos.vel.z * SimDeltaTime;
        carElt->_yaw += car->restPos.vel.az * SimDeltaTime;
        carElt->_roll += car->restPos.vel.ax * SimDeltaTime;
        carElt->_pitch += car->restPos.vel.ay * SimDeltaTime;
        sgMakeCoordMat4(carElt->pub.posMat, carElt->_pos_X, carElt->_pos_Y, carElt->_pos_Z - carElt->_statGC_z,
            RAD2DEG(carElt->_yaw), RAD2DEG(carElt->_roll), RAD2DEG(carElt->_pitch));

        if (carElt->_pos_Z > (car->restPos.pos.z + PULL_Z_OFFSET)) {
            carElt->_state &= ~RM_CAR_STATE_PULLUP;
            carElt->_state |= RM_CAR_STATE_PULLSIDE;
            // Moved pullside velocity computation down due to floating point error accumulation.
        }
        return;
    }


    if (carElt->_state & RM_CAR_STATE_PULLSIDE) {
        // Recompute speed to avoid missing the parking point due to error accumulation (the pos might be
        // in the 0-10000 range, depending on the track and vel*dt is around 0-0.001, so basically all
        // but the most significant digits are lost under bad conditions, happens e.g on e-track-4).
        // Should not lead to a division by zero because the pullside process stops if the car is within
        // [0.5, 0.5]. Do not move it back.
        travelTime = DIST(car->restPos.pos.x, car->restPos.pos.y, carElt->_pos_X, carElt->_pos_Y) / PULL_SPD;
        car->restPos.vel.x = (car->restPos.pos.x - carElt->_pos_X) / travelTime;
        car->restPos.vel.y = (car->restPos.pos.y - carElt->_pos_Y) / travelTime;

        carElt->_pos_X += car->restPos.vel.x * SimDeltaTime;
        carElt->_pos_Y += car->restPos.vel.y * SimDeltaTime;
        sgMakeCoordMat4(carElt->pub.posMat, carElt->_pos_X, carElt->_pos_Y, carElt->_pos_Z - carElt->_statGC_z,
            RAD2DEG(carElt->_yaw), RAD2DEG(carElt->_roll), RAD2DEG(carElt->_pitch));

        if ((fabs(car->restPos.pos.x - carElt->_pos_X) < 0.5) && (fabs(car->restPos.pos.y - carElt->_pos_Y) < 0.5)) {
            carElt->_state &= ~RM_CAR_STATE_PULLSIDE;
            carElt->_state |= RM_CAR_STATE_PULLDN;
        }
        return;
    }


    if (carElt->_state & RM_CAR_STATE_PULLDN) {
        carElt->_pos_Z -= car->restPos.vel.z * SimDeltaTime;
        sgMakeCoordMat4(carElt->pub.posMat, carElt->_pos_X, carElt->_pos_Y, carElt->_pos_Z - carElt->_statGC_z,
            RAD2DEG(carElt->_yaw), RAD2DEG(carElt->_roll), RAD2DEG(carElt->_pitch));

        if (carElt->_pos_Z < car->restPos.pos.z) {
            carElt->_state &= ~RM_CAR_STATE_PULLDN;
            carElt->_state |= RM_CAR_STATE_OUT;
        }
        return;
    }


    if (carElt->_state & (RM_CAR_STATE_NO_SIMU & ~RM_CAR_STATE_PIT)) {
        return;
    }

    if (carElt->_state & RM_CAR_STATE_PIT) {
        if ((s->_maxDammage) && (car->dammage > s->_maxDammage)) {
            // Broken during pit stop.
            carElt->_state &= ~RM_CAR_STATE_PIT;
            carElt->_pit->pitCarIndex = TR_PIT_STATE_FREE;
        } else {
            return;
        }
    }

    if ((s->_maxDammage) && (car->dammage > s->_maxDammage)) {
        carElt->_state |= RM_CAR_STATE_BROKEN;
    } else {
        carElt->_state |= RM_CAR_STATE_OUTOFGAS;
    }

    carElt->_gear = car->transmission.gearbox.gear = 0;
    carElt->_enginerpm = car->engine.rads = 0;

    if (!(carElt->_state & RM_CAR_STATE_DNF)) {
        if (fabs(carElt->_speed_x) > 1.0) {
            return;
        }
    }

    carElt->_state |= RM_CAR_STATE_PULLUP;
    // RM_CAR_STATE_NO_SIMU evaluates to > 0 from here, so we remove the car from the
    // collision detection.
    SimCollideRemoveCar(car, s->_ncars);

    carElt->priv.simcollision = carElt->priv.collision = car->collision = 0;
    for(i = 0; i < 4; i++) {
        carElt->_skid[i] = 0;
        carElt->_wheelSpinVel(i) = 0;
        carElt->_brakeTemp(i) = 0;
    }

    carElt->pub.DynGC = car->DynGC;
    carElt->_speed_x = 0;

    // Compute the target zone for the wrecked car.
    trkPos = car->trkPos;
    if (trkPos.toRight >  trkPos.seg->width / 2.0) {
        while (trkPos.seg->lside != 0) {
            trkPos.seg = trkPos.seg->lside;
        }
        trkPos.toLeft = -3.0;
        trkFlag = TR_TOLEFT;
    } else {
        while (trkPos.seg->rside != 0) {
            trkPos.seg = trkPos.seg->rside;
        }
        trkPos.toRight = -3.0;
        trkFlag = TR_TORIGHT;
    }

    trkPos.type = TR_LPOS_SEGMENT;
    RtTrackLocal2Global(&trkPos, &(car->restPos.pos.x), &(car->restPos.pos.y), trkFlag);
    car->restPos.pos.z = RtTrackHeightL(&trkPos) + carElt->_statGC_z;
    car->restPos.pos.az = RtTrackSideTgAngleL(&trkPos);
    car->restPos.pos.ax = 0;
    car->restPos.pos.ay = 0;

    car->restPos.vel.z = PULL_SPD;
    travelTime = (car->restPos.pos.z + PULL_Z_OFFSET - carElt->_pos_Z) / car->restPos.vel.z;
    dang = car->restPos.pos.az - carElt->_yaw;
    NORM_PI_PI(dang);
    car->restPos.vel.az = dang / travelTime;
    dang = car->restPos.pos.ax - carElt->_roll;
    NORM_PI_PI(dang);
    car->restPos.vel.ax = dang / travelTime;
    dang = car->restPos.pos.ay - carElt->_pitch;
    NORM_PI_PI(dang);
    car->restPos.vel.ay = dang / travelTime;
}



void
SimUpdate(tSituation *s, double deltaTime, int telemetry)
{
    int i;
    int ncar;
    tCarElt *carElt;
    tCar *car;
    
    SimDeltaTime = deltaTime;
    SimTelemetry = telemetry;
    for (ncar = 0; ncar < s->_ncars; ncar++) {
        SimCarTable[ncar].collision = 0;
        SimCarTable[ncar].blocked = 0;
    }
    
    for (ncar = 0; ncar < s->_ncars; ncar++) {
        car = &(SimCarTable[ncar]);
        carElt = car->carElt;
    
        if (carElt->_state & RM_CAR_STATE_NO_SIMU) {
            RemoveCar(car, s);
            continue;
        } else if (((s->_maxDammage) && (car->dammage > s->_maxDammage)) ||
            (car->fuel == 0) ||
            (car->carElt->_state & RM_CAR_STATE_ELIMINATED))  {
            RemoveCar(car, s);
            if (carElt->_state & RM_CAR_STATE_NO_SIMU) {
                continue;
            }
        }
    
        if (s->_raceState & RM_RACE_PRESTART) {
            car->ctrl->gear = 0;
        }
        
        SimAtmosphereUpdate(car, s);
        CHECK(car);
        ctrlCheck(car);
        CHECK(car);
        SimSteerUpdate(car);
        CHECK(car);
        SimGearboxUpdate(car);
        CHECK(car);
        SimEngineUpdateTq(car);
        CHECK(car);
    
        if (!(s->_raceState & RM_RACE_PRESTART)) {
    
            SimCarUpdateWheelPos(car);
            CHECK(car);
            SimBrakeSystemUpdate(car);
            CHECK(car);
            SimAeroUpdate(car, s);
            CHECK(car);
            for (i = 0; i < 2; i++){
                SimWingUpdate(car, i, s);
            }
            CHECK(car);
            for (i = 0; i < 4; i++){
                SimWheelUpdateRide(car, i);
            }
            CHECK(car);
            for (i = 0; i < 2; i++){
                SimAxleUpdate(car, i);
            }
            CHECK(car);
            for (i = 0; i < 4; i++){
                SimWheelUpdateForce(car, i);
                SimWheelUpdateTire(car, i);
                
                // Reset tire damage in pre simulation state (when the model is thrown in the world) 
                if (s->_raceState == 0) {
                    SimWheelResetWear(car, i);
                }
            }
            CHECK(car);
            SimTransmissionUpdate(car);
            CHECK(car);
            SimWheelUpdateRotation(car);
            CHECK(car);
            SimCarUpdate(car, s);
            CHECK(car);
        } else {
            SimEngineUpdateRpm(car, 0.0);
        }
    }
    
    SimCarCollideCars(s);
    
    /* printf ("%f - ", s->currentTime); */
    
    for (ncar = 0; ncar < s->_ncars; ncar++) {
        car = &(SimCarTable[ncar]);
        CHECK(car);
        carElt = car->carElt;
    
        if (carElt->_state & RM_CAR_STATE_NO_SIMU) {
            continue;
        }
    
        CHECK(car);
        SimCarUpdate2(car, s); /* telemetry */
    
        /* copy back the data to carElt */
    
        carElt->pub.DynGC = car->DynGC;
        carElt->pub.DynGCg = car->DynGCg;
        carElt->pub.speed = car->speed;
        sgMakeCoordMat4(carElt->pub.posMat, carElt->_pos_X, carElt->_pos_Y, carElt->_pos_Z - carElt->_statGC_z,
                RAD2DEG(carElt->_yaw), RAD2DEG(carElt->_roll), RAD2DEG(carElt->_pitch));
        carElt->_trkPos = car->trkPos;

        for (i = 0; i < 4; i++) {
            tWheelState* const wheelState = &(carElt->priv.wheel[i]);
            const tWheel* const wheel = &(car->wheel[i]);

            wheelState->relPos = wheel->relPos;
            wheelState->seg = wheel->trkPos.seg;
            wheelState->brakeTemp = wheel->brake.temp;
            wheelState->currentGraining = wheel->currentGraining;
            wheelState->currentPressure = wheel->currentPressure;
            wheelState->currentTemperature = wheel->currentTemperature;
            wheelState->currentWear = wheel->currentWear;

            carElt->pub.corner[i] = car->corner[i].pos;
        }

        carElt->_gear = car->transmission.gearbox.gear;
        carElt->_enginerpm = car->engine.rads;
        carElt->_fuel = car->fuel;
        carElt->priv.collision |= car->collision;
        carElt->priv.simcollision = car->collision;
        carElt->_dammage = car->dammage;
        carElt->priv.localPressure = car->localPressure;
        carElt->priv.repCmdMaxClicks = car->brkSyst.repCmdMaxClicks;
        carElt->priv.brakeRepartitionCmd = car->ctrl->brakeRepartitionCmd;
    }
}


void
SimInit(int nbcars, tTrack* track, tdble fuelFactor, tdble damageFactor, tdble tireFactor)
{
    rulesFuelFactor = fuelFactor;
    rulesDamageFactor = damageFactor;
    rulesTireFactor = tireFactor;
    SimNbCars = nbcars;
    SimCarTable = (tCar*)calloc(nbcars, sizeof(tCar));
    SimCarCollideInit(track);
}

void
SimShutdown(void)
{
    tCar *car;
    int  ncar;

    SimCarCollideShutdown(SimNbCars);
    if (SimCarTable) {
    for (ncar = 0; ncar < SimNbCars; ncar++) {
        car = &(SimCarTable[ncar]);
        SimEngineShutdown(car);
    }
    free(SimCarTable);
    SimCarTable = 0;
    }
}


bool SimAdjustPitCarSetupParam(tCarPitSetupValue* v)
{
    // If min == max there is nothing to adjust
    if (fabs(v->max - v->min) >= 0.0001f) {
        // Ensure that value is in intended borders
        if (v->value > v->max) {
            v->value = v->max;
        } else if (v->value < v->min) {
            v->value = v->min;
        }
        return true;
    }

    v->value = v->max;
    return false;
}