REDRIVER2/src_rebuild/GAME/C/WHEELFORCES.C

#include "THISDUST.H"
#include "WHEELFORCES.H"

HANDLING_TYPE handlingType[7] = {
	{0x20, 1, 0, 1},
	{0x1D, 0, 0, 0},
	{0x2D, 1, 1, 0},
	{0x37, 1, 1, 0},
	{0x44, 1, 1, 0},
	{0x20, 1, 0, 1},
	{0x1D, 0, 0, 0}
};

// decompiled code
// original method signature: 
// void /*$ra*/ StepCars()
 // line 66, offset 0x00082bd0
	/* begin block 1 */
		// Start line: 68
		// Start offset: 0x00082BD0
		// Variables:
	// 		struct _CAR_DATA **ppCar; // $s0
	// 		struct _CAR_DATA **end; // $s1

		/* begin block 1.1 */
			// Start line: 73
			// Start offset: 0x00082C0C
		/* end block 1.1 */
		// End offset: 0x00082C0C
		// End Line: 76

		/* begin block 1.2 */
			// Start line: 80
			// Start offset: 0x00082C34
		/* end block 1.2 */
		// End offset: 0x00082C34
		// End Line: 81
	/* end block 1 */
	// End offset: 0x00082C64
	// End Line: 83

	/* begin block 2 */
		// Start line: 1357
	/* end block 2 */
	// End Line: 1358

	/* begin block 3 */
		// Start line: 132
	/* end block 3 */
	// End Line: 133

	/* begin block 4 */
		// Start line: 1358
	/* end block 4 */
	// End Line: 1359

	/* begin block 5 */
		// Start line: 1359
	/* end block 5 */
	// End Line: 1360

/* WARNING: Unknown calling convention yet parameter storage is locked */

void StepCars(void)

{
  _CAR_DATA *cp;
  _CAR_DATA **pp_Var1;
  _CAR_DATA **pp_Var2;
  
  pp_Var2 = active_car_list20 + num_active_cars;
  pp_Var1 = active_car_list20;
  while (pp_Var1 < pp_Var2) {
    cp = *pp_Var1;
    pp_Var1 = pp_Var1 + 1;
    StepOneCar(cp);
  }
  pp_Var1 = active_car_list20;
  while (pp_Var1 < pp_Var2) {
    cp = *pp_Var1;
    pp_Var1 = pp_Var1 + 1;
    ControlCarRevs(cp);
  }
  return;
}



// decompiled code
// original method signature: 
// void /*$ra*/ StepOneCar(struct _CAR_DATA *cp /*$s1*/)
 // line 98, offset 0x00081178
	/* begin block 1 */
		// Start line: 99
		// Start offset: 0x00081178
		// Variables:
	// 		struct CAR_LOCALS _cl; // stack offset -248
	// 		struct CAR_LOCALS *cl; // $s3
	// 		int i; // $s0
	// 		int speed; // $v1
	// 		struct _sdPlane *SurfacePtr; // stack offset -48

		/* begin block 1.1 */
			// Start line: 122
			// Start offset: 0x00081214
			// Variables:
		// 		int a; // $v1
		// 		int b; // $a0
		/* end block 1.1 */
		// End offset: 0x0008127C
		// End Line: 131

		/* begin block 1.2 */
			// Start line: 133
			// Start offset: 0x0008127C
			// Variables:
		// 		long deepestNormal[4]; // stack offset -208
		// 		long deepestLever[4]; // stack offset -192
		// 		long deepestPoint[4]; // stack offset -176
		// 		int lift; // $s5
		// 		int count; // $a0
		// 		int friToUse; // $s6
		// 		struct SVECTOR *carDisp; // $a1

			/* begin block 1.2.1 */
				// Start line: 156
				// Start offset: 0x00081314
				// Variables:
			// 		long pointPos[4]; // stack offset -160
			// 		long surfacePoint[4]; // stack offset -144
			// 		long surfaceNormal[4]; // stack offset -128
			// 		long lever[4]; // stack offset -112
			// 		int newLift; // $a0
			/* end block 1.2.1 */
			// End offset: 0x00081410
			// End Line: 196

			/* begin block 1.2.2 */
				// Start line: 201
				// Start offset: 0x00081428
				// Variables:
			// 		long pointVel[4]; // stack offset -112
			// 		long reaction[4]; // stack offset -96
			// 		int strikeVel; // $a2
			// 		int componant; // $t3
			// 		static int frictionLimit[6]; // offset 0x0

				/* begin block 1.2.2.1 */
					// Start line: 209
					// Start offset: 0x00081428
					// Variables:
				// 		int lever_dot_n; // $v1
				// 		int twistY; // $v0
				// 		int displacementsquared; // $a0
				// 		int denom; // $a0
				/* end block 1.2.2.1 */
				// End offset: 0x00081428
				// End Line: 209

				/* begin block 1.2.2.2 */
					// Start line: 226
					// Start offset: 0x00081630
					// Variables:
				// 		int loss; // $v1
				// 		int limit; // $a1
				/* end block 1.2.2.2 */
				// End offset: 0x0008166C
				// End Line: 230

				/* begin block 1.2.2.3 */
					// Start line: 235
					// Start offset: 0x000816B8

					/* begin block 1.2.2.3.1 */
						// Start line: 237
						// Start offset: 0x000816CC
						// Variables:
					// 		struct VECTOR direction; // stack offset -80
					/* end block 1.2.2.3.1 */
					// End offset: 0x000816CC
					// End Line: 237

					/* begin block 1.2.2.3.2 */
						// Start line: 242
						// Start offset: 0x0008170C
						// Variables:
					// 		struct VECTOR direction; // stack offset -64
					/* end block 1.2.2.3.2 */
					// End offset: 0x00081744
					// End Line: 244
				/* end block 1.2.2.3 */
				// End offset: 0x0008179C
				// End Line: 249
			/* end block 1.2.2 */
			// End offset: 0x0008179C
			// End Line: 250

			/* begin block 1.2.3 */
				// Start line: 256
				// Start offset: 0x0008186C
				// Variables:
			// 		struct VECTOR offset; // stack offset -112
			/* end block 1.2.3 */
			// End offset: 0x00081944
			// End Line: 269
		/* end block 1.2 */
		// End offset: 0x00081944
		// End Line: 270
	/* end block 1 */
	// End offset: 0x0008198C
	// End Line: 282

	/* begin block 2 */
		// Start line: 196
	/* end block 2 */
	// End Line: 197

	/* begin block 3 */
		// Start line: 211
	/* end block 3 */
	// End Line: 212

void StepOneCar(_CAR_DATA *cp)

{
  int iVar1;
  undefined4 in_zero;
  undefined4 in_at;
  CAR_COSMETICS *pCVar2;
  uint uVar3;
  int iVar4;
  uint *puVar5;
  int iVar6;
  uint *puVar7;
  int *piVar8;
  int *piVar9;
  int *piVar10;
  int *piVar11;
  int iVar12;
  int iVar13;
  SVECTOR *pSVar14;
  int unaff_s6;
  long *plVar15;
  CAR_LOCALS local_f8;
  int local_d0;
  int local_cc;
  int local_c8 [4];
  int local_b8;
  VECTOR local_b0;
  VECTOR local_a0;
  VECTOR local_90;
  VECTOR local_80;
  int local_70;
  int local_6c;
  int local_68 [4];
  int local_58 [2];
  VECTOR local_50;
  VECTOR local_40;
  _sdPlane *local_30 [2];
  
  iVar12 = 2;
  plVar15 = (cp->hd).where.t;
  puVar7 = (uint *)(local_f8.vel + 2);
  puVar5 = (uint *)(cp->st + 8);
  local_30[0] = (_sdPlane *)0x0;
  local_f8.aggressive = (uint)(byte)handlingType[cp->hndType].aggressiveBraking;
  local_f8.extraangulardamping = 0;
  do {
    uVar3 = puVar5[10];
    iVar12 = iVar12 + -1;
    *puVar7 = puVar5[7];
    puVar7[4] = uVar3;
    puVar7 = puVar7 + -1;
    *puVar5 = (*puVar5 & 0xf) + puVar5[-0x37] * 0x10;
    puVar5 = puVar5 + -1;
  } while (-1 < iVar12);
  (cp->hd).acc[0] = 0;
  (cp->hd).acc[1] = -0x1d20;
  (cp->hd).acc[2] = 0;
  iVar12 = local_f8.vel[0] + 0x800 >> 0xc;
  iVar4 = local_f8.vel[2] + 0x800 >> 0xc;
  if (iVar12 < 0) {
    iVar12 = -iVar12;
  }
  if (iVar4 < 0) {
    iVar4 = -iVar4;
  }
  if (iVar12 < iVar4) {
    iVar4 = iVar4 + iVar12 / 2;
  }
  else {
    iVar4 = iVar12 + iVar4 / 2;
  }
  pCVar2 = (cp->ap).carCos;
  iVar12 = 0;
  (cp->hd).speed = iVar4;
  setCopControlWord(2,0,*(undefined4 *)(cp->hd).where.m);
  setCopControlWord(2,0x800,*(undefined4 *)((cp->hd).where.m + 2));
  setCopControlWord(2,0x1000,*(undefined4 *)((cp->hd).where.m + 4));
  setCopControlWord(2,0x1800,*(undefined4 *)((cp->hd).where.m + 6));
  setCopControlWord(2,0x2000,*(undefined4 *)((cp->hd).where.m + 8));
  setCopControlWord(2,0x2800,*plVar15);
  setCopControlWord(2,0x3000,(cp->hd).where.t[1]);
  setCopControlWord(2,0x3800,(cp->hd).where.t[2]);
  iVar4 = 0xc;
  if ((0x800 < (cp->hd).where.m[4]) && (iVar4 = 4, cp->controlType == '\x02')) {
    iVar4 = (uint)(cp->totalDamage != 0) << 2;
  }
  iVar13 = iVar4 + -1;
  if (iVar4 != 0) {
    pSVar14 = pCVar2->cPoints + iVar13;
    do {
      setCopReg(2,in_zero,*(undefined4 *)pSVar14);
      setCopReg(2,in_at,*(undefined4 *)&pSVar14->vz);
      copFunction(2,0x480012);
      local_a0.vx = getCopReg(2,0x19);
      local_a0.vy = getCopReg(2,0x1a);
      local_a0.vz = getCopReg(2,0x1b);
      local_70 = local_a0.vx - (cp->hd).where.t[0];
      local_6c = local_a0.vy - (cp->hd).where.t[1];
      local_68[0] = local_a0.vz - (cp->hd).where.t[2];
      FindSurfaceD2(&local_a0,&local_80,&local_90,local_30);
      if (((local_90.vy - local_a0.vy) - 1U < 799) &&
         (iVar4 = (local_90.vy - local_a0.vy) * local_80.vy + 0x800 >> 0xc, iVar12 < iVar4)) {
        unaff_s6 = 0;
        local_cc = local_80.vy;
        local_b0.vy = local_90.vy;
        local_d0 = local_80.vx;
        local_c8[0] = local_80.vz;
        local_c8[2] = local_70;
        local_c8[3] = local_6c;
        local_b8 = local_68[0];
        local_b0.vx = local_90.vx;
        local_b0.vz = local_90.vz;
        iVar12 = iVar4;
        if (3 < iVar13) {
          unaff_s6 = 3;
        }
      }
      iVar13 = iVar13 + -1;
      pSVar14 = pSVar14 + -1;
    } while (iVar13 != -1);
  }
  if (iVar12 != 0) {
    local_70 = ((local_f8.avel[1] * local_b8 - local_f8.avel[2] * local_c8[3]) + 0x800 >> 0xc) +
               local_f8.vel[0];
    local_6c = ((local_f8.avel[2] * local_c8[2] - local_f8.avel[0] * local_b8) + 0x800 >> 0xc) +
               local_f8.vel[1];
    iVar4 = local_c8[2] * local_d0 + local_c8[3] * local_cc + local_b8 * local_c8[0] + 0x800 >> 0xc;
    local_68[0] = ((local_f8.avel[0] * local_c8[3] - local_f8.avel[1] * local_c8[2]) + 0x800 >> 0xc)
                  + local_f8.vel[2];
    iVar4 = (((local_c8[2] * local_c8[2] + local_c8[3] * local_c8[3] + local_b8 * local_b8) -
             iVar4 * iVar4) * (int)car_cosmetics[(byte)(cp->ap).model].twistRateY + 0x800 >> 0xc) +
            0x1000;
    if (iVar4 == 0) {
      trap(7);
    }
    iVar13 = 2;
    impulse = (((local_70 >> 6) * (local_d0 >> 6) + (local_6c >> 6) * (local_cc >> 6) +
               (local_68[0] >> 6) * (local_c8[0] >> 6)) / iVar4) * -0x800;
    piVar11 = local_58;
    piVar10 = local_c8;
    piVar9 = local_68;
    piVar8 = (int *)(unaff_s6 * 4 + 0xa1f10);
    do {
      iVar6 = *piVar8;
      iVar4 = *piVar9 * 0x43;
      iVar1 = -iVar6;
      if ((iVar4 <= iVar6) && (iVar6 = iVar4, iVar4 < iVar1)) {
        iVar6 = iVar1;
      }
      iVar4 = *piVar10;
      piVar10 = piVar10 + -1;
      piVar9 = piVar9 + -1;
      piVar8 = piVar8 + -1;
      iVar13 = iVar13 + -1;
      *piVar11 = (impulse * iVar4 - iVar6) + 0x800 >> 0xc;
      piVar11 = piVar11 + -1;
    } while (-1 < iVar13);
    if (20000 < impulse) {
      if (gNight == 1) {
        local_50.vx = DAT_00011ebc;
        local_50.vy = DAT_00011ec0;
        local_50.vz = DAT_00011ec4;
        local_50.pad = DAT_00011ec8;
        Setup_Sparks(&local_b0,&local_50,0xf,'\x01');
      }
      else {
        local_40.vx = DAT_00011ecc;
        local_40.vy = DAT_00011ed0;
        local_40.vz = DAT_00011ed4;
        local_40.pad = DAT_00011ed8;
        Setup_Debris(&local_b0,&local_40,10,0);
      }
      if ((local_30[0]->surface != 9) && (local_30[0]->surface != 6)) {
        iVar4 = GetPlayerId(cp);
        CollisionSound((char)iVar4,cp,(impulse / 6 + (impulse >> 0x1f) >> 3) - (impulse >> 0x1f),0);
      }
    }
    iVar13 = (cp->hd).acc[1];
    (cp->hd).acc[0] = (cp->hd).acc[0] + local_68[2];
    iVar4 = (cp->hd).acc[2];
    (cp->hd).acc[1] = iVar13 + local_68[3];
    (cp->hd).acc[2] = iVar4 + local_58[0];
    (cp->hd).aacc[0] =
         (cp->hd).aacc[0] + ((local_c8[3] * local_58[0] - local_b8 * local_68[3]) + 0x800 >> 0xc);
    (cp->hd).aacc[1] =
         (cp->hd).aacc[1] + ((local_b8 * local_68[2] - local_c8[2] * local_58[0]) + 0x800 >> 0xc);
    (cp->hd).aacc[2] =
         (cp->hd).aacc[2] + ((local_c8[2] * local_68[3] - local_c8[3] * local_68[2]) + 0x800 >> 0xc)
    ;
    if (iVar12 != 0) {
      local_70 = iVar12 * local_d0 + 0x800 >> 0xc;
      local_6c = iVar12 * local_cc + 0x800 >> 0xc;
      local_68[0] = iVar12 * local_c8[0] + 0x800 >> 0xc;
      iVar4 = (cp->hd).where.t[1];
      (cp->hd).where.t[0] = (cp->hd).where.t[0] + local_70;
      iVar13 = (cp->hd).where.t[2];
      (cp->hd).where.t[1] = iVar4 + local_6c;
      iVar4 = *(int *)cp->st;
      (cp->hd).where.t[2] = iVar13 + local_68[0];
      iVar13 = *(int *)(cp->st + 4);
      *(int *)cp->st = iVar4 + local_70 * 0x10;
      *(int *)(cp->st + 4) = iVar13 + local_6c * 0x10;
      *(int *)(cp->st + 8) = *(int *)(cp->st + 8) + local_68[0] * 0x10;
      setCopControlWord(2,0x2800,*plVar15);
      setCopControlWord(2,0x3000,(cp->hd).where.t[1]);
      setCopControlWord(2,0x3800,(cp->hd).where.t[2]);
      local_f8.extraangulardamping = 1;
      if (0x78 < iVar12) {
        *(undefined4 *)(cp->st + 0x20) = 0;
      }
    }
  }
  AddWheelForcesDriver1(cp,&local_f8);
  ConvertTorqueToAngularAcceleration(cp,&local_f8);
  (cp->hd).mayBeColliding = '\0';
  return;
}



// decompiled code
// original method signature: 
// void /*$ra*/ GetFrictionScalesDriver1(struct _CAR_DATA *cp /*$t0*/, struct CAR_LOCALS *cl /*$a1*/, int *frontFS /*$a2*/, int *rearFS /*$a3*/)
 // line 288, offset 0x0008198c
	/* begin block 1 */
		// Start line: 289
		// Start offset: 0x0008198C
		// Variables:
	// 		struct _HANDLING_TYPE *hp; // $t2

		/* begin block 1.1 */
			// Start line: 306
			// Start offset: 0x00081A1C
			// Variables:
		// 		int q; // $v1
		/* end block 1.1 */
		// End offset: 0x00081A98
		// End Line: 314

		/* begin block 1.2 */
			// Start line: 387
			// Start offset: 0x00081DC8
			// Variables:
		// 		int traction; // $a0
		/* end block 1.2 */
		// End offset: 0x00081E20
		// End Line: 393
	/* end block 1 */
	// End offset: 0x00081E20
	// End Line: 394

	/* begin block 2 */
		// Start line: 800
	/* end block 2 */
	// End Line: 801

	/* begin block 3 */
		// Start line: 807
	/* end block 3 */
	// End Line: 808

void GetFrictionScalesDriver1(_CAR_DATA *cp,CAR_LOCALS *cl,int *frontFS,int *rearFS)

{
  byte bVar1;
  int iVar2;
  int iVar3;
  
  bVar1 = cp->hndType;
  if (cp->thrust < 0) {
    iVar2 = 0x5ad;
  }
  else {
    iVar2 = 0x334;
    if (cp->thrust < 1) {
      iVar2 = 0x3a9;
    }
  }
  *frontFS = iVar2;
  if ((((cp->wheelspin == '\0') && (handlingType[cp->hndType].autoBrakeOn != '\0')) &&
      (iVar2 = (int)(cp->hd).autoBrake, 0 < iVar2)) && (0 < (cp->hd).wheel_speed)) {
    iVar3 = iVar2 << 1;
    if (0xd < iVar2) {
      iVar2 = 0xd;
      iVar3 = 0x1a;
    }
    *frontFS = *frontFS + (iVar3 + iVar2) * 0xf;
    if (handlingType[cp->hndType].autoBrakeOn == '\x02') {
      while (FrameCnt != 0x78654321) {
        trap(0x400);
      }
    }
  }
  if ((((cp->thrust < 0) && (0xa3d7 < (cp->hd).wheel_speed)) && (cp->hndType == '\0')) ||
     (((cp->controlType == '\x02' && (cp->ai[0xf9] == 3)) && (cp->ai[0xc] != 9)))) {
    (cp->hd).wheel[3].locked = '\x01';
    (cp->hd).wheel[2].locked = '\x01';
    (cp->hd).wheel[1].locked = '\x01';
    (cp->hd).wheel[0].locked = '\x01';
  }
  else {
    (cp->hd).wheel[3].locked = '\0';
    (cp->hd).wheel[2].locked = '\0';
    (cp->hd).wheel[1].locked = '\0';
    (cp->hd).wheel[0].locked = '\0';
  }
  if (cp->handbrake == '\0') {
    if (cp->wheelspin != '\0') {
      *frontFS = *frontFS + 600;
    }
  }
  else {
    if (-1 < cp->thrust) {
      cp->thrust = 0;
    }
    if ((cp->hd).wheel_speed < 1) {
      iVar2 = *frontFS + -0x177;
    }
    else {
      iVar2 = *frontFS + 0x290;
    }
    *frontFS = iVar2;
    (cp->hd).wheel[1].locked = '\x01';
    (cp->hd).wheel[3].locked = '\x01';
    cp->wheelspin = '\0';
  }
  if ((((cp->hd).wheel_speed < 0) && (-1 < cp->thrust)) && (cp->handbrake == '\0')) {
    *frontFS = *frontFS + -400;
  }
  *rearFS = 0x780 - *frontFS;
  if (cp->wheelspin != '\0') {
    cp->thrust = (short)((int)((cp->ap).carCos)->powerRatio * 5000 + 0x800 >> 0xc);
  }
  if (((cp->thrust < 0) && (0xa3d7 < (cp->hd).wheel_speed)) && (cl->aggressive != 0)) {
    iVar2 = *frontFS * 10;
    if (iVar2 < 0) {
      iVar2 = iVar2 + 7;
    }
    *frontFS = iVar2 >> 3;
    iVar2 = *rearFS * 10;
    if (iVar2 < 0) {
      iVar2 = iVar2 + 7;
    }
    *rearFS = iVar2 >> 3;
  }
  else {
    if ((cp->hd).wheel[0].onGrass == '\0') {
      iVar3 = *frontFS;
      iVar2 = iVar3 * 0x24;
    }
    else {
      iVar3 = *frontFS;
      iVar2 = iVar3 * 0x28;
    }
    iVar2 = iVar2 - iVar3;
    if (iVar2 < 0) {
      iVar2 = iVar2 + 0x1f;
    }
    *frontFS = iVar2 >> 5;
  }
  iVar2 = *frontFS * (uint)(byte)handlingType[bVar1].frictionScaleRatio;
  if (iVar2 < 0) {
    iVar2 = iVar2 + 0x1f;
  }
  *frontFS = iVar2 >> 5;
  iVar2 = *rearFS * (uint)(byte)handlingType[bVar1].frictionScaleRatio;
  if (iVar2 < 0) {
    iVar2 = iVar2 + 0x1f;
  }
  *rearFS = iVar2 >> 5;
  if ((cp->hndType == '\x05') && (cp->ai[0] == 5)) {
    *frontFS = (*frontFS * 3) / 2;
    *rearFS = (*rearFS * 3) / 2;
  }
  iVar2 = (int)((cp->ap).carCos)->traction;
  if (iVar2 != 0x1000) {
    *frontFS = *frontFS * iVar2 + 0x800 >> 0xc;
    *rearFS = *rearFS * iVar2 + 0x800 >> 0xc;
  }
  return;
}



// decompiled code
// original method signature: 
// void /*$ra*/ ConvertTorqueToAngularAcceleration(struct _CAR_DATA *cp /*$a0*/, struct CAR_LOCALS *cl /*$t5*/)
 // line 412, offset 0x00081e20
	/* begin block 1 */
		// Start line: 413
		// Start offset: 0x00081E20
		// Variables:
	// 		long nose[4]; // stack offset -16
	// 		int zd; // $a3
	// 		int i; // $t4
	// 		int twistY; // $t0
	// 		int twistZ; // $v1
	/* end block 1 */
	// End offset: 0x00081F50
	// End Line: 439

	/* begin block 2 */
		// Start line: 1035
	/* end block 2 */
	// End Line: 1036

	/* begin block 3 */
		// Start line: 1036
	/* end block 3 */
	// End Line: 1037

	/* begin block 4 */
		// Start line: 1055
	/* end block 4 */
	// End Line: 1056

	/* begin block 5 */
		// Start line: 1065
	/* end block 5 */
	// End Line: 1066

void ConvertTorqueToAngularAcceleration(_CAR_DATA *cp,CAR_LOCALS *cl)

{
  short sVar1;
  short sVar2;
  short sVar3;
  short sVar4;
  short sVar5;
  int iVar6;
  int iVar7;
  int iVar8;
  int iVar9;
  uint uVar10;
  int iVar11;
  int *piVar12;
  int *piVar13;
  short *psVar14;
  int iVar15;
  
  sVar1 = (cp->hd).where.m[2];
  iVar6 = (cp->hd).aacc[0];
  sVar2 = (cp->hd).where.m[5];
  iVar7 = (cp->hd).aacc[1];
  psVar14 = (cp->hd).where.m + 8;
  piVar12 = (cp->hd).aacc + 2;
  sVar3 = (cp->hd).where.m[8];
  iVar8 = (cp->hd).aacc[2];
  uVar10 = (uint)(byte)(cp->ap).model;
  sVar4 = car_cosmetics[uVar10].twistRateY;
  sVar5 = car_cosmetics[uVar10].twistRateZ;
  iVar15 = 2;
  piVar13 = cl->avel + 2;
  do {
    iVar11 = *piVar12 * (int)sVar4 +
             ((int)*psVar14 *
              ((int)sVar5 - (int)sVar4) *
              (sVar1 * iVar6 + sVar2 * iVar7 + sVar3 * iVar8 + 0x800 >> 0xc) + *piVar13 * -0x80 +
              0x800 >> 0xc);
    *piVar12 = iVar11;
    if (cl->extraangulardamping == 1) {
      iVar9 = *piVar13;
      if (iVar9 < 0) {
        iVar9 = iVar9 + 7;
      }
      *piVar12 = iVar11 - (iVar9 >> 3);
    }
    piVar13 = piVar13 + -1;
    psVar14 = psVar14 + -3;
    iVar15 = iVar15 + -1;
    piVar12 = piVar12 + -1;
  } while (-1 < iVar15);
  return;
}



// decompiled code
// original method signature: 
// void /*$ra*/ AddWheelForcesDriver1(struct _CAR_DATA *cp /*$s2*/, struct CAR_LOCALS *cl /*$s7*/)
 // line 442, offset 0x00081f50
	/* begin block 1 */
		// Start line: 443
		// Start offset: 0x00081F50
		// Variables:
	// 		int oldSpeed; // $v1
	// 		int frictionScale; // $fp
	// 		int frontFS; // stack offset -96
	// 		int rearFS; // stack offset -92
	// 		int i; // stack offset -84
	// 		int cdx; // stack offset -80
	// 		int cdz; // stack offset -76
	// 		int sdx; // stack offset -72
	// 		int sdz; // stack offset -68
	// 		int friction_coef; // $s6
	// 		struct CAR_COSMETICS *car_cos; // stack offset -64
	// 		struct _sdPlane *SurfacePtr; // stack offset -88
	// 		int player_id; // stack offset -60

		/* begin block 1.1 */
			// Start line: 469
			// Start offset: 0x000820A4
			// Variables:
		// 		int oldCompression; // $s5
		// 		int newCompression; // $s3
		// 		int susForce; // $s0
		// 		long wheelPos[4]; // stack offset -176
		// 		long surfacePoint[4]; // stack offset -160
		// 		long surfaceNormal[4]; // stack offset -144

			/* begin block 1.1.1 */
				// Start line: 488
				// Start offset: 0x00082140
				// Variables:
			// 		short typ; // $v1
			/* end block 1.1.1 */
			// End offset: 0x000821D8
			// End Line: 497

			/* begin block 1.1.2 */
				// Start line: 513
				// Start offset: 0x00082284
				// Variables:
			// 		int chan; // $s1
			/* end block 1.1.2 */
			// End offset: 0x0008231C
			// End Line: 525

			/* begin block 1.1.3 */
				// Start line: 537
				// Start offset: 0x00082380
				// Variables:
			// 		struct VECTOR force; // stack offset -128
			// 		long pointVel[4]; // stack offset -112
			// 		int lfx; // $a2
			// 		int lfz; // $t2
			// 		int sidevel; // $t0
			// 		int slidevel; // $t1

				/* begin block 1.1.3.1 */
					// Start line: 554
					// Start offset: 0x0008248C
				/* end block 1.1.3.1 */
				// End offset: 0x000824F0
				// End Line: 559

				/* begin block 1.1.3.2 */
					// Start line: 592
					// Start offset: 0x00082630
					// Variables:
				// 		int hack; // $v0
				// 		int hx; // $v0
				// 		int hz; // $v1
				/* end block 1.1.3.2 */
				// End offset: 0x00082630
				// End Line: 592

				/* begin block 1.1.3.3 */
					// Start line: 645
					// Start offset: 0x000828F0
					// Variables:
				// 		int a; // $v1
				/* end block 1.1.3.3 */
				// End offset: 0x00082928
				// End Line: 648
			/* end block 1.1.3 */
			// End offset: 0x00082A04
			// End Line: 671
		/* end block 1.1 */
		// End offset: 0x00082ADC
		// End Line: 679
	/* end block 1 */
	// End offset: 0x00082BD0
	// End Line: 694

	/* begin block 2 */
		// Start line: 1168
	/* end block 2 */
	// End Line: 1169

	/* begin block 3 */
		// Start line: 1172
	/* end block 3 */
	// End Line: 1173

void AddWheelForcesDriver1(_CAR_DATA *cp,CAR_LOCALS *cl)

{
  byte bVar1;
  short sVar2;
  long lVar3;
  VECTOR *pVVar4;
  undefined4 in_zero;
  undefined4 in_at;
  uint uVar5;
  int iVar6;
  int iVar7;
  int iVar8;
  bool bVar9;
  int iVar10;
  int iVar11;
  uint uVar12;
  int iVar13;
  int iVar14;
  int iVar15;
  int chan;
  int iVar16;
  WHEEL *pWVar17;
  VECTOR local_b0;
  VECTOR VStack160;
  VECTOR local_90;
  int local_80;
  int local_7c;
  int local_78;
  int local_70;
  int local_6c;
  int local_68;
  int local_60;
  int local_5c;
  _sdPlane *local_58;
  uint local_54;
  int local_50;
  int local_4c;
  int local_48;
  int local_44;
  CAR_COSMETICS *local_40;
  int local_3c;
  VECTOR *local_38;
  VECTOR *local_34;
  VECTOR *local_30;
  _sdPlane **local_2c;
  
  iVar10 = (cp->hd).speed * 3 >> 1;
  if (iVar10 < 0x20) {
    iVar10 = iVar10 * -0x48 + 0xe70;
  }
  else {
    iVar10 = 0x590 - iVar10;
  }
  uVar5 = (cp->hd).direction;
  local_58 = (_sdPlane *)0x0;
  uVar12 = uVar5 & 0xfff;
  uVar5 = uVar5 + (int)cp->wheel_angle & 0xfff;
  local_50 = (int)rcossin_tbl[uVar12 * 2];
  local_4c = (int)rcossin_tbl[uVar12 * 2 + 1];
  local_48 = (int)rcossin_tbl[uVar5 * 2];
  local_44 = (int)rcossin_tbl[uVar5 * 2 + 1];
  local_3c = GetPlayerId(cp);
  local_40 = car_cosmetics + (byte)(cp->ap).model;
  GetFrictionScalesDriver1(cp,cl,&local_60,&local_5c);
  (cp->hd).front_vel = 0;
  (cp->hd).rear_vel = 0;
  if (0xce4 < iVar10) {
    iVar10 = 0xce4;
  }
  local_38 = &local_b0;
  local_30 = &local_90;
  local_54 = 3;
  local_34 = &VStack160;
  local_2c = &local_58;
  pWVar17 = (cp->hd).wheel + 3;
  do {
    pVVar4 = local_38;
    setCopReg(2,in_zero,*(undefined4 *)(local_40->wheelDisp + local_54));
    setCopReg(2,in_at,*(undefined4 *)&local_40->wheelDisp[local_54].vz);
    copFunction(2,0x480012);
    lVar3 = getCopReg(2,0x19);
    local_38->vx = lVar3;
    lVar3 = getCopReg(2,0x1a);
    pVVar4->vy = lVar3;
    lVar3 = getCopReg(2,0x1b);
    pVVar4->vz = lVar3;
    iVar6 = FindSurfaceD2(local_38,local_30,local_34,local_2c);
    bVar9 = false;
    iVar6 = (iVar6 * (0x7e90 - wetness) >> 0xf) + 500;
    if (local_58 != (_sdPlane *)0x0) {
      bVar9 = local_58->surface == 4;
    }
    *(bool *)&pWVar17->onGrass = bVar9;
    if (local_58 == (_sdPlane *)0x0) {
      pWVar17->surface = '\0';
    }
    else {
      sVar2 = local_58->surface;
      if ((((sVar2 == 4) || (sVar2 == 6)) || (sVar2 == 0xb)) || (sVar2 == 9)) {
        pWVar17->surface = -0x80;
      }
      else {
        pWVar17->surface = '\0';
      }
      if (sVar2 == 8) {
        pWVar17->surface = pWVar17->surface | 2;
      }
      else {
        if (sVar2 < 9) {
          if (sVar2 == 6) {
LAB_000821c4:
            pWVar17->surface = pWVar17->surface | 1;
          }
        }
        else {
          if (sVar2 == 9) goto LAB_000821c4;
          if (sVar2 == 0xb) {
            pWVar17->surface = pWVar17->surface | 3;
          }
        }
      }
    }
    bVar1 = pWVar17->susCompression;
    uVar5 = (uint)bVar1;
    chan = ((VStack160.vy - local_b0.vy) * local_90.vy + 0x800 >> 0xc) + 0xe;
    iVar16 = chan;
    if (chan < 0) {
      iVar16 = 0;
    }
    if (800 < chan) {
      iVar16 = 0xc;
    }
    if (cp->controlType == '\x01') {
      chan = iVar16 - uVar5;
      if (chan < 0) {
        chan = uVar5 - iVar16;
      }
      if ((0xc < chan) && ((local_54 & 1) != 0)) {
        chan = GetFreeChannel();
        if ((1 < NumPlayers) && (NoPlayerControl == 0)) {
          SetPlayerOwnsChannel(chan,(char)local_3c);
        }
        Start3DSoundVolPitch
                  (chan,1,5,(cp->hd).where.t[0],(cp->hd).where.t[1],(cp->hd).where.t[2],-0x9c4,400);
        SetChannelPosition3(chan,(VECTOR *)(cp->hd).where.t,(long *)0x0,-0x9c4,400,0);
      }
      if (iVar16 < 0x55) {
        if (0x30 < iVar16) {
          SetPadVibration((int)**(char **)cp->ai,'\x03');
        }
      }
      else {
        SetPadVibration((int)**(char **)cp->ai,'\x02');
      }
    }
    if (0x2a < iVar16) {
      iVar16 = 0x2a;
    }
    if ((iVar16 == 0) && (bVar1 == 0)) {
      pWVar17->susCompression = '\0';
    }
    else {
      local_b0.vz = local_b0.vz - (cp->hd).where.t[2];
      local_b0.vy = local_b0.vy - (cp->hd).where.t[1];
      local_b0.vx = local_b0.vx - (cp->hd).where.t[0];
      local_78 = 0;
      local_80 = 0;
      local_70 = ((cl->avel[1] * local_b0.vz - cl->avel[2] * local_b0.vy) + 0x800 >> 0xc) +
                 cl->vel[0];
      local_6c = ((cl->avel[2] * local_b0.vx - cl->avel[0] * local_b0.vz) + 0x800 >> 0xc) +
                 cl->vel[1];
      local_68 = ((cl->avel[0] * local_b0.vy - cl->avel[1] * local_b0.vx) + 0x800 >> 0xc) +
                 cl->vel[2];
      chan = iVar16 * 0xe6 + uVar5 * -100;
      if (pWVar17->locked == '\0') {
        uVar5 = local_54 & 1;
        if (uVar5 == 0) {
          iVar15 = -local_48;
          iVar14 = local_44;
        }
        else {
          iVar15 = -local_50;
          iVar14 = local_4c;
        }
      }
      else {
        uVar12 = ratan2(local_70 >> 6,local_68 >> 6);
        uVar5 = local_54 & 1;
        iVar15 = (int)rcossin_tbl[(uVar12 & 0xfff) * 2 + 1];
        iVar11 = local_70;
        if (local_70 < 0) {
          iVar11 = -local_70;
        }
        iVar7 = local_68;
        if (local_68 < 0) {
          iVar7 = -local_68;
        }
        iVar14 = (int)rcossin_tbl[(uVar12 & 0xfff) * 2];
        if (iVar11 + iVar7 < 8000) {
          local_90.vx = 0;
          local_90.vy = 0x1000;
          local_90.vz = 0;
        }
      }
      iVar11 = local_70;
      if (local_70 < 0) {
        iVar11 = local_70 + 0x3f;
      }
      iVar7 = iVar14;
      if (iVar14 < 0) {
        iVar7 = iVar14 + 0x3f;
      }
      iVar13 = local_68;
      if (local_68 < 0) {
        iVar13 = local_68 + 0x3f;
      }
      iVar8 = iVar15;
      if (iVar15 < 0) {
        iVar8 = iVar15 + 0x3f;
      }
      iVar7 = (iVar11 >> 6) * (iVar7 >> 6) + (iVar13 >> 6) * (iVar8 >> 6);
      iVar11 = iVar10;
      if (iVar10 < 0) {
        iVar11 = iVar10 + 0x3f;
      }
      iVar13 = iVar7;
      if (iVar7 < 0) {
        iVar13 = iVar7 + 0x3f;
      }
      iVar11 = (iVar11 >> 6) * (iVar13 >> 6);
      if (iVar11 < 0) {
        iVar11 = -iVar11;
      }
      if (iVar7 < 0xc351) {
        if (iVar7 < -50000) {
LAB_00082604:
          iVar7 = -0x30d4;
        }
        else {
          iVar7 = iVar10 * iVar7 + 0x800 >> 0xc;
          if (0x30d4 < iVar7) goto LAB_000825f4;
          if (iVar7 < -0x30d4) goto LAB_00082604;
        }
      }
      else {
LAB_000825f4:
        iVar7 = 0x30d4;
      }
      if (uVar5 == 0) {
        iVar13 = local_60 * iVar7 + 0x800;
        iVar7 = iVar13 >> 0xc;
        if (pWVar17->locked == '\0') {
          if (cp->controlType == '\x03') {
            local_80 = local_80 + local_48 * cp->thrust;
            local_78 = local_78 + local_44 * cp->thrust;
          }
        }
        else {
          iVar7 = (iVar13 >> 0xd) + iVar7 >> 1;
          iVar13 = ((-iVar7 * iVar14 + 0x800 >> 0xc) * local_44 -
                   (-iVar7 * iVar15 + 0x800 >> 0xc) * local_48) + 0x400 >> 0xb;
          local_80 = local_80 + iVar13 * local_44;
          local_78 = local_78 + -iVar13 * local_48;
        }
        if ((cp->hd).front_vel < iVar11) {
          (cp->hd).front_vel = iVar11;
        }
      }
      else {
        if (pWVar17->locked == '\0') {
          iVar7 = local_5c * iVar7 + 0x800 >> 0xc;
          if ((handlingType[cp->hndType].autoBrakeOn != '\0') && (0 < iVar7 * cp->wheel_angle)) {
            (cp->hd).autoBrake = -1;
          }
          local_80 = local_80 + -iVar15 * (int)cp->thrust;
          local_78 = local_78 + iVar14 * (int)cp->thrust;
        }
        else {
          iVar7 = local_60 * iVar7 + 0x2000 >> 0xe;
        }
        if ((cp->hd).rear_vel < iVar11) {
          (cp->hd).rear_vel = iVar11;
        }
      }
      local_80 = local_80 + (chan * local_90.vx - iVar7 * iVar14) + cl->vel[0] * -0xc;
      local_78 = local_78 + (chan * local_90.vz - iVar7 * iVar15) + cl->vel[2] * -0xc;
      if ((pWVar17->surface & 7) == 1) {
        local_80 = local_80 + cl->vel[0] * -0x4b;
        local_78 = local_78 + cl->vel[2] * -0x4b;
      }
      iVar15 = (int)(cp->hd).where.m[4];
      if (iVar15 < 0x800) {
        iVar15 = 0x1000 - iVar15;
        if (iVar15 < 0x1001) {
          iVar15 = 0x1000 - (iVar15 * iVar15 + 0x800 >> 0xc);
        }
        else {
          iVar15 = 0;
        }
        iVar6 = iVar6 * iVar15 + 0x800 >> 0xc;
      }
      if (local_90.vy < 0xccc) {
        iVar6 = iVar6 * local_90.vy * 5 >> 0xe;
      }
      local_7c = chan * local_90.vy + cl->vel[1] * -0xc + 0x800 >> 0xc;
      local_80 = (local_80 + 0x800 >> 0xc) * iVar6 >> 0xc;
      local_78 = (local_78 + 0x800 >> 0xc) * iVar6 >> 0xc;
      if (cp->controlType == '\x03') {
        if (gCopDifficultyLevel == 2) {
          local_b0.vy = local_b0.vy * 0xc;
        }
        else {
          local_b0.vy = local_b0.vy * 0x13;
        }
        if (local_b0.vy < 0) {
          local_b0.vy = local_b0.vy + 0x1f;
        }
        local_b0.vy = local_b0.vy >> 5;
      }
      chan = (cp->hd).acc[1];
      (cp->hd).acc[0] = (cp->hd).acc[0] + local_80;
      iVar6 = (cp->hd).acc[2];
      (cp->hd).acc[1] = chan + local_7c;
      (cp->hd).acc[2] = iVar6 + local_78;
      (cp->hd).aacc[0] =
           (cp->hd).aacc[0] + ((local_b0.vy * local_78 - local_b0.vz * local_7c) + 0x800 >> 0xc);
      (cp->hd).aacc[1] =
           (cp->hd).aacc[1] + ((local_b0.vz * local_80 - local_b0.vx * local_78) + 0x800 >> 0xc);
      (cp->hd).aacc[2] =
           (cp->hd).aacc[2] + ((local_b0.vx * local_7c - local_b0.vy * local_80) + 0x800 >> 0xc);
      pWVar17->susCompression = (char)iVar16;
    }
    pWVar17 = pWVar17 + -1;
    local_54 = local_54 - 1;
  } while (-1 < (int)local_54);
  if (((cp->hd).wheel[1].susCompression == '\0') && ((cp->hd).wheel[3].susCompression == '\0')) {
    uVar5 = 0x1a0000;
    if (cp->thrust < 1) {
      uVar5 = 0;
      if (-1 < cp->thrust) goto LAB_00082b9c;
      uVar5 = 0xffed0000;
    }
    uVar5 = uVar5 | 0x4000;
  }
  else {
    iVar10 = cl->vel[0];
    if (iVar10 < 0) {
      iVar10 = iVar10 + 0x3f;
    }
    if (local_50 < 0) {
      local_50 = local_50 + 0x3f;
    }
    iVar6 = cl->vel[2];
    if (iVar6 < 0) {
      iVar6 = iVar6 + 0x3f;
    }
    if (local_4c < 0) {
      local_4c = local_4c + 0x3f;
    }
    uVar5 = (iVar10 >> 6) * (local_50 >> 6) + (iVar6 >> 6) * (local_4c >> 6);
  }
LAB_00082b9c:
  (cp->hd).wheel_speed = uVar5;
  return;
}