1 files changed, 106 insertions, 0 deletions
diff --git a/src/vehicles/Transmission.cpp b/src/vehicles/Transmission.cpp
index 2be25cbb..d500d004 100644
--- a/src/vehicles/Transmission.cpp
+++ b/src/vehicles/Transmission.cpp
@@ -1,5 +1,7 @@
 #include "common.h"
 #include "patcher.h"
+#include "Timer.h"
+#include "HandlingMgr.h"
 #include "Transmission.h"
 
 void
@@ -35,3 +37,107 @@ cTransmission::InitGearRatios(void)
 
 	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 = fEngineAcceleration*accelMul * (targetVelocity - fVelocity)/Abs(targetVelocity);
+		if(Abs(fVelocity) < Abs(Gears[gear].fMaxVelocity*fCheat))
+			fAcceleration = gasPedal * accel * CTimer::GetTimeStep();
+		else
+			fAcceleration = 0.0f;
+	}
+	return fAcceleration;
+}
+
+STARTPATCHES
+	InjectHook(0x550A00, &cTransmission::CalculateGearForSimpleCar, PATCH_JUMP);
+	InjectHook(0x5506B0, &cTransmission::CalculateDriveAcceleration, PATCH_JUMP);
+ENDPATCHES