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#include "common.h"
#include "Timer.h"
#include "HandlingMgr.h"
#include "Transmission.h"
void
cTransmission::InitGearRatios(void)
{
static tGear *pGearRatio0 = nil;
static tGear *pGearRatio1 = nil;
int i;
float velocityDiff;
memset(Gears, 0, sizeof(Gears));
for(i = 1; i <= nNumberOfGears; i++){
pGearRatio0 = &Gears[i-1];
pGearRatio1 = &Gears[i];
pGearRatio1->fMaxVelocity = (float)i / nNumberOfGears * fMaxVelocity;
velocityDiff = pGearRatio1->fMaxVelocity - pGearRatio0->fMaxVelocity;
if(i >= nNumberOfGears){
pGearRatio1->fShiftUpVelocity = fMaxVelocity;
}else{
Gears[i+1].fShiftDownVelocity = velocityDiff*0.42f + pGearRatio0->fMaxVelocity;
pGearRatio1->fShiftUpVelocity = velocityDiff*0.6667f + pGearRatio0->fMaxVelocity;
}
}
// Reverse gear
Gears[0].fMaxVelocity = fMaxReverseVelocity;
Gears[0].fShiftUpVelocity = -0.01f;
Gears[0].fShiftDownVelocity = fMaxReverseVelocity;
Gears[1].fShiftDownVelocity = -0.01f;
}
void
cTransmission::CalculateGearForSimpleCar(float speed, uint8 &gear)
{
static tGear *pGearRatio;
pGearRatio = &Gears[gear];
fCurVelocity = speed;
if(speed > pGearRatio->fShiftUpVelocity)
gear++;
else if(speed < pGearRatio->fShiftDownVelocity){
if(gear - 1 < 0)
gear = 0;
else
gear--;
}
}
float
cTransmission::CalculateDriveAcceleration(const float &gasPedal, uint8 &gear, float &time, const float &velocity, bool cheat)
{
static float fAcceleration = 0.0f;
static float fVelocity;
static float fCheat;
static tGear *pGearRatio;
fVelocity = velocity;
if(fVelocity < fMaxReverseVelocity){
fVelocity = fMaxReverseVelocity;
return 0.0f;
}
if(fVelocity > fMaxVelocity){
fVelocity = fMaxVelocity;
return 0.0f;
}
fCurVelocity = fVelocity;
assert(gear <= nNumberOfGears);
pGearRatio = &Gears[gear];
if(fVelocity > pGearRatio->fShiftUpVelocity){
if(gear != 0 || gasPedal > 0.0f){
gear++;
time = 0.0f;
return CalculateDriveAcceleration(gasPedal, gear, time, fVelocity, false);
}
}else if(fVelocity < pGearRatio->fShiftDownVelocity && gear != 0){
if(gear != 1 || gasPedal < 0.0f){
gear--;
time = 0.0f;
return CalculateDriveAcceleration(gasPedal, gear, time, fVelocity, false);
}
}
if(time > 0.0f){
// changing gears currently, can't accelerate
fAcceleration = 0.0f;
time -= CTimer::GetTimeStepInSeconds();
}else{
float speedMul, accelMul;
if(gear < 1){
// going reverse
accelMul = (Flags & HANDLING_2G_BOOST) ? 2.0f : 1.0f;
speedMul = -1.0f;
}else if(nNumberOfGears == 1){
accelMul = 1.0f;
speedMul = 1.0f;
}else{
// BUG or not? this is 1.0 normally but 0.0 in the highest gear
float f = 1.0f - (gear-1)/(nNumberOfGears-1);
speedMul = 3.0f*sq(f) + 1.0f;
// This is pretty ugly, could be written more clearly
if(Flags & HANDLING_2G_BOOST){
if(gear == 1)
accelMul = (Flags & HANDLING_1G_BOOST) ? 3.0f : 2.0f;
else if(gear == 2)
accelMul = 1.3f;
else
accelMul = 1.0f;
}else if(Flags & HANDLING_1G_BOOST && gear == 1){
accelMul = 3.0f;
}else
accelMul = 1.0f;
}
if(cheat)
fCheat = 1.2f;
else
fCheat = 1.0f;
float targetVelocity = Gears[gear].fMaxVelocity*speedMul*fCheat;
float accel = (targetVelocity - fVelocity) * (fEngineAcceleration*accelMul) / Abs(targetVelocity);
if(Abs(fVelocity) < Abs(Gears[gear].fMaxVelocity*fCheat))
fAcceleration = gasPedal * accel * CTimer::GetTimeStep();
else
fAcceleration = 0.0f;
}
return fAcceleration;
}
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