From a672860c401aa1ca179fce42e439c59f8d07f6d8 Mon Sep 17 00:00:00 2001
From: aap <aap@papnet.eu>
Date: Sat, 16 Jan 2021 19:38:05 +0100
Subject: initial work on vehicles

---
 src/vehicles/Transmission.cpp | 120 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 115 insertions(+), 5 deletions(-)

(limited to 'src/vehicles/Transmission.cpp')

diff --git a/src/vehicles/Transmission.cpp b/src/vehicles/Transmission.cpp
index b3e1af7d..ce4b97f4 100644
--- a/src/vehicles/Transmission.cpp
+++ b/src/vehicles/Transmission.cpp
@@ -4,7 +4,7 @@
 #include "HandlingMgr.h"
 #include "Transmission.h"
 
-//--MIAMI: done
+//--LCS: file done
 
 void
 cTransmission::InitGearRatios(void)
@@ -16,11 +16,14 @@ cTransmission::InitGearRatios(void)
 
 	memset(Gears, 0, sizeof(Gears));
 
+	float baseVelocity = 0.5f*fMaxVelocity / nNumberOfGears;
+	float step = (fMaxVelocity - baseVelocity) / nNumberOfGears;
+
 	for(i = 1; i <= nNumberOfGears; i++){
 		pGearRatio0 = &Gears[i-1];
 		pGearRatio1 = &Gears[i];
 
-		pGearRatio1->fMaxVelocity = (float)i / nNumberOfGears * fMaxVelocity;
+		pGearRatio1->fMaxVelocity = baseVelocity + i*step;
 
 		velocityDiff = pGearRatio1->fMaxVelocity - pGearRatio0->fMaxVelocity;
 
@@ -47,9 +50,12 @@ cTransmission::CalculateGearForSimpleCar(float speed, uint8 &gear)
 
 	pGearRatio = &Gears[gear];
 	fCurVelocity = speed;
-	if(speed > pGearRatio->fShiftUpVelocity)
-		gear++;
-	else if(speed < pGearRatio->fShiftDownVelocity){
+	if(speed > pGearRatio->fShiftUpVelocity){
+		if(gear + 1 > nNumberOfGears)
+			gear = nNumberOfGears;
+		else
+			gear++;
+	}else if(speed < pGearRatio->fShiftDownVelocity){
 		if(gear - 1 < 0)
 			gear = 0;
 		else
@@ -57,6 +63,110 @@ cTransmission::CalculateGearForSimpleCar(float speed, uint8 &gear)
 	}
 }
 
+float TRANSMISSION_NITROS_INERTIA_MULT = 0.5f;
+float TRANSMISSION_AI_CHEAT_INERTIA_MULT = 0.75f;
+float TRANSMISSION_NITROS_MULT = 2.0f;
+float TRANSMISSION_AI_CHEAT_MULT = 1.2f;
+float TRANSMISSION_SMOOTHER_FRAC = 0.85f;
+float TRANSMISSION_FREE_ACCELERATION = 0.1f;
+
+//--LCS: done
+float
+cTransmission::CalculateDriveAcceleration(const float &gasPedal, uint8 &gear, float &time, const float &velocity, float *inertiaVar1, float *inertiaVar2, uint8 nDriveWheels, uint8 cheat)
+{
+	static float fAcceleration = 0.0f;
+	static float fVelocity;
+	static float fCheat;
+	static tGear *pGearRatio;
+
+	fVelocity = velocity;
+	if(fVelocity < fMaxReverseVelocity)
+		return 0.0f;
+	if(fVelocity > fMaxVelocity)
+		return 0.0f;
+	fCurVelocity = fVelocity;
+
+	assert(gear <= nNumberOfGears);
+
+	pGearRatio = &Gears[gear];
+	if(fVelocity > pGearRatio->fShiftUpVelocity){
+		if(gear != 0 || gasPedal > 0.0f){
+			gear++;
+			return CalculateDriveAcceleration(gasPedal, gear, time, fVelocity, nil, nil, 0, false);
+		}
+	}else if(fVelocity < pGearRatio->fShiftDownVelocity && gear != 0){
+		if(gear != 1 || gasPedal < 0.0f){
+			gear--;
+			return CalculateDriveAcceleration(gasPedal, gear, time, fVelocity, nil, nil, 0, false);
+		}
+	}
+
+	float accelMul;
+
+	if(nNumberOfGears == 1){
+		accelMul = 1.0f;
+	}else if(gear == 0){
+		accelMul = 4.5f;
+	}else{
+		float f = 1.0f - (gear-1.0f)/(nNumberOfGears-1.0f);
+		if(Flags & HANDLING_1G_BOOST)
+			accelMul = SQR(f)*5.0f + 1.0f;
+		else if(Flags & HANDLING_2G_BOOST)
+			accelMul = SQR(f)*4.0f + 1.0f;
+		else
+			accelMul = SQR(f)*3.0f + 1.0f;
+	}
+
+	fCheat = 1.0f;
+	float nitroMult = 1.0f;
+	if(cheat == 1)
+		fCheat = TRANSMISSION_AI_CHEAT_MULT;
+	else if(cheat == 2)
+		nitroMult = TRANSMISSION_NITROS_MULT;
+
+	fAcceleration = fEngineAcceleration*CTimer::GetTimeStep()*0.4f*accelMul*gasPedal*fCheat*nitroMult;
+
+	if(inertiaVar1 != nil && inertiaVar2 != nil){
+		if(nDriveWheels == 0){
+			float f = TRANSMISSION_FREE_ACCELERATION*CTimer::GetTimeStep()*Abs(gasPedal)/fEngineInertia;
+			*inertiaVar1 = Min(*inertiaVar1 + f, 1.0f);
+			*inertiaVar2 = 0.1f;
+		}else{
+			float var1;
+			// What is being calculated here?
+			// TODO: find better names for the inertia vars
+			if(gear == 0){
+				var1 = ((fMaxVelocity/nNumberOfGears)*(1.0f-0.6667f) - fVelocity) /
+				       ((fMaxVelocity/nNumberOfGears)*(1.0f-0.6667f) - Gears[gear].fShiftDownVelocity);
+			}else if(gear == 1){
+				var1 = ((fMaxVelocity/nNumberOfGears)*(1.0f-0.6667f) + fVelocity) /
+				       ((fMaxVelocity/nNumberOfGears)*(1.0f-0.6667f) + Gears[gear].fShiftUpVelocity);
+			}else{
+				var1 = (fVelocity - Gears[gear].fShiftDownVelocity) /
+				       (Gears[gear].fShiftUpVelocity - Gears[gear].fShiftDownVelocity);
+			}
+			float inertiaMult = var1 - *inertiaVar1;
+			if(cheat == 1)
+				inertiaMult *= TRANSMISSION_AI_CHEAT_INERTIA_MULT;
+			else if(cheat == 2)
+				inertiaMult *= TRANSMISSION_NITROS_INERTIA_MULT;
+			float var2target = 1.0f - inertiaMult*fEngineInertia;
+			var2target = clamp(var2target, 0.1f, 1.0f);
+			*inertiaVar2 = (1.0f-TRANSMISSION_SMOOTHER_FRAC)*var2target + TRANSMISSION_SMOOTHER_FRAC*(*inertiaVar2);
+			*inertiaVar1 = var1;
+			fAcceleration *= *inertiaVar2;
+		}
+	}
+
+	float targetVelocity = Gears[gear].fMaxVelocity*fCheat;
+	if(Gears[gear].fMaxVelocity < 0.0f && targetVelocity > fVelocity)
+		fAcceleration *= 1.0f - Min((targetVelocity - fVelocity)/0.05f, 1.0f);
+	else if(Gears[gear].fMaxVelocity > 0.0f && targetVelocity < fVelocity)
+		fAcceleration *= 1.0f - Min((fVelocity - targetVelocity)/0.05f, 1.0f);
+	return fAcceleration;
+}
+
+// TEMP old VC code until we have bikes
 float
 cTransmission::CalculateDriveAcceleration(const float &gasPedal, uint8 &gear, float &time, const float &velocity, bool cheat)
 {
-- 
cgit v1.2.3