bool BigInt::FMulPow5(long c5)
{
AssertBi(this);
Assert(c5 >= 0);
const ulong k5to13 = 1220703125;
long clu = (c5 + 12) / 13;
ulong luT;
if (0 == m_clu || 0 == c5)
return true;
if (m_clu + clu > m_cluMax && !FResize(m_clu + clu))
return false;
for (; c5 >= 13; c5 -= 13)
AssertVerify(FMulAdd(k5to13, 0));
if (c5 > 0)
{
for (luT = 5; --c5 > 0; )
luT *= 5;
AssertVerify(FMulAdd(luT, 0));
}
AssertBi(this);
return true;
}
bool BigInt::FInitFromDigits(const EncodedChar *prgch, long cch, long *pcchDig)
{
AssertBi(this);
Assert(cch >= 0);
Assert(prgch != 0);
Assert(pcchDig != 0);
ulong luAdd;
ulong luMul;
long clu = (cch + 8) / 9;
const EncodedChar *pchLim = prgch + cch;
if (clu > m_cluMax && !FResize(clu))
return false;
m_clu = 0;
luAdd = 0;
luMul = 1;
for (*pcchDig = cch; prgch < pchLim; prgch++)
{
if (*prgch == '.')
{
(*pcchDig)--;
continue;
}
Assert(NumberUtilities::IsDigit(*prgch));
if (luMul == 1000000000)
{
AssertVerify(FMulAdd(luMul, luAdd));
luMul = 1;
luAdd = 0;
}
luMul *= 10;
luAdd = luAdd * 10 + *prgch - '0';
}
Assert(1 < luMul);
AssertVerify(FMulAdd(luMul, luAdd));
AssertBi(this);
return true;
}
void solveFriction_BStatic(const PxcSolverConstraintDesc& desc, PxcSolverContext& /*cache*/)
{
PxcSolverBody& b0 = *desc.bodyA;
Vec3V linVel0 = V3LoadA(b0.linearVelocity);
Vec3V angVel0 = V3LoadA(b0.angularVelocity);
const PxU8* PX_RESTRICT currPtr = desc.constraint;
const PxU8* PX_RESTRICT last = currPtr + getConstraintLength(desc);
//hopefully pointer aliasing doesn't bite.
//PxVec3 l0, a0;
//PxVec3_From_Vec3V(linVel0, l0);
//PxVec3_From_Vec3V(angVel0, a0);
//PX_ASSERT(l0.isFinite());
//PX_ASSERT(a0.isFinite());
while(currPtr < last)
{
const PxcSolverFrictionHeader* PX_RESTRICT frictionHeader = (PxcSolverFrictionHeader*)currPtr;
const PxU32 numFrictionConstr = frictionHeader->numFrictionConstr;
currPtr +=sizeof(PxcSolverFrictionHeader);
PxF32* appliedImpulse = (PxF32*)currPtr;
currPtr +=frictionHeader->getAppliedForcePaddingSize();
PxcSolverFriction* PX_RESTRICT frictions = (PxcSolverFriction*)currPtr;
currPtr += numFrictionConstr * sizeof(PxcSolverFriction);
const FloatV staticFriction = frictionHeader->getStaticFriction();
for(PxU32 i=0;i<numFrictionConstr;i++)
{
PxcSolverFriction& f = frictions[i];
Ps::prefetchLine(&frictions[i+1]);
const Vec3V t0 = Vec3V_From_Vec4V(f.normalXYZ_appliedForceW);
const Vec3V raXt0 = Vec3V_From_Vec4V(f.raXnXYZ_velMultiplierW);
const FloatV appliedForce = V4GetW(f.normalXYZ_appliedForceW);
const FloatV velMultiplier = V4GetW(f.raXnXYZ_velMultiplierW);
const FloatV targetVel = V4GetW(f.rbXnXYZ_targetVelocityW);
//const FloatV normalImpulse = contacts[f.contactIndex].getAppliedForce();
const FloatV normalImpulse = FLoad(appliedImpulse[f.contactIndex]);
const FloatV maxFriction = FMul(staticFriction, normalImpulse);
const FloatV nMaxFriction = FNeg(maxFriction);
//Compute the normal velocity of the constraint.
const FloatV t0Vel1 = V3Dot(t0, linVel0);
const FloatV t0Vel2 = V3Dot(raXt0, angVel0);
//const FloatV unbiasedErr = FMul(targetVel, velMultiplier);
//const FloatV biasedErr = FMulAdd(targetVel, velMultiplier, nScaledBias);
const FloatV t0Vel = FAdd(t0Vel1, t0Vel2);
const Vec3V delAngVel0 = Vec3V_From_Vec4V(f.delAngVel0_InvMassADom);
const Vec3V delLinVel0 = V3Scale(t0, V4GetW(f.delAngVel0_InvMassADom));
// still lots to do here: using loop pipelining we can interweave this code with the
// above - the code here has a lot of stalls that we would thereby eliminate
//FloatV deltaF = FSub(scaledBias, FMul(t0Vel, velMultiplier));//FNeg(FMul(t0Vel, velMultiplier));
//FloatV deltaF = FMul(t0Vel, velMultiplier);
//FloatV newForce = FMulAdd(t0Vel, velMultiplier, appliedForce);
const FloatV tmp = FNegMulSub(targetVel,velMultiplier,appliedForce);
FloatV newForce = FMulAdd(t0Vel, velMultiplier, tmp);
newForce = FClamp(newForce, nMaxFriction, maxFriction);
const FloatV deltaF = FSub(newForce, appliedForce);
linVel0 = V3ScaleAdd(delLinVel0, deltaF, linVel0);
angVel0 = V3ScaleAdd(delAngVel0, deltaF, angVel0);
f.setAppliedForce(newForce);
}
}
//PxVec3_From_Vec3V(linVel0, l0);
//PxVec3_From_Vec3V(angVel0, a0);
//PX_ASSERT(l0.isFinite());
//PX_ASSERT(a0.isFinite());
// Write back
V3StoreU(linVel0, b0.linearVelocity);
V3StoreU(angVel0, b0.angularVelocity);
PX_ASSERT(currPtr == last);
}
void solveContactCoulomb_BStatic(const PxcSolverConstraintDesc& desc, PxcSolverContext& /*cache*/)
{
PxcSolverBody& b0 = *desc.bodyA;
Vec3V linVel0 = V3LoadA(b0.linearVelocity);
Vec3V angVel0 = V3LoadA(b0.angularVelocity);
PxcSolverContactCoulombHeader* firstHeader = (PxcSolverContactCoulombHeader*)desc.constraint;
const PxU8* PX_RESTRICT last = desc.constraint + firstHeader->frictionOffset;//getConstraintLength(desc);
//hopefully pointer aliasing doesn't bite.
const PxU8* PX_RESTRICT currPtr = desc.constraint;
const FloatV zero = FZero();
while(currPtr < last)
{
PxcSolverContactCoulombHeader* PX_RESTRICT hdr = (PxcSolverContactCoulombHeader*)currPtr;
currPtr += sizeof(PxcSolverContactCoulombHeader);
const PxU32 numNormalConstr = hdr->numNormalConstr;
PxcSolverContact* PX_RESTRICT contacts = (PxcSolverContact*)currPtr;
Ps::prefetchLine(contacts);
currPtr += numNormalConstr * sizeof(PxcSolverContact);
PxF32* appliedImpulse = (PxF32*) (((PxU8*)hdr) + hdr->frictionOffset + sizeof(PxcSolverFrictionHeader));
Ps::prefetchLine(appliedImpulse);
const Vec3V normal = hdr->getNormal();
const FloatV invMassDom0 = FLoad(hdr->dominance0);
FloatV normalVel1 = V3Dot(normal, linVel0);
const Vec3V delLinVel0 = V3Scale(normal, invMassDom0);
FloatV accumDeltaF = zero;
//FloatV accumImpulse = zero;
for(PxU32 i=0;i<numNormalConstr;i++)
{
PxcSolverContact& c = contacts[i];
Ps::prefetchLine(&contacts[i+1]);
//const Vec4V normalXYZ_velMultiplierW = c.normalXYZ_velMultiplierW;
const Vec4V raXnXYZ_appliedForceW = c.raXnXYZ_appliedForceW;
const Vec4V rbXnXYZ_velMultiplierW = c.rbXnXYZ_velMultiplierW;
//const Vec3V normal = c.normal;
//const Vec3V normal = Vec3V_From_Vec4V(normalXYZ_velMultiplierW);
const Vec3V raXn = Vec3V_From_Vec4V(raXnXYZ_appliedForceW);
const FloatV appliedForce = V4GetW(raXnXYZ_appliedForceW);
const FloatV velMultiplier = V4GetW(rbXnXYZ_velMultiplierW);
//const FloatV velMultiplier = V4GetW(normalXYZ_velMultiplierW);
const Vec3V delAngVel0 = Vec3V_From_Vec4V(c.delAngVel0_InvMassADom);
const FloatV targetVel = c.getTargetVelocity();
const FloatV nScaledBias = FNeg(c.getScaledBias());
const FloatV maxImpulse = c.getMaxImpulse();
//Compute the normal velocity of the constraint.
//const FloatV normalVel1 = V3Dot(normal, linVel0);
const FloatV normalVel2 = V3Dot(raXn, angVel0);
const FloatV normalVel = FAdd(normalVel1, normalVel2);
//const FloatV unbiasedErr = FMul(targetVel, velMultiplier);
const FloatV biasedErr = FMulAdd(targetVel, velMultiplier, nScaledBias);
// still lots to do here: using loop pipelining we can interweave this code with the
// above - the code here has a lot of stalls that we would thereby eliminate
const FloatV _deltaF = FMax(FNegMulSub(normalVel, velMultiplier, biasedErr), FNeg(appliedForce));
const FloatV _newForce = FAdd(appliedForce, _deltaF);
const FloatV newForce = FMin(_newForce, maxImpulse);
const FloatV deltaF = FSub(newForce, appliedForce);
//linVel0 = V3MulAdd(delLinVel0, deltaF, linVel0);
normalVel1 = FScaleAdd(invMassDom0, deltaF, normalVel1);
angVel0 = V3ScaleAdd(delAngVel0, deltaF, angVel0);
accumDeltaF = FAdd(accumDeltaF, deltaF);
c.setAppliedForce(newForce);
Ps::aos::FStore(newForce, &appliedImpulse[i]);
Ps::prefetchLine(&appliedImpulse[i], 128);
//accumImpulse = FAdd(accumImpulse, newAppliedForce);
}
linVel0 = V3ScaleAdd(delLinVel0, accumDeltaF, linVel0);
//hdr->setAccumlatedForce(accumImpulse);
}
// Write back
V3StoreU(linVel0, b0.linearVelocity);
V3StoreU(angVel0, b0.angularVelocity);
PX_ASSERT(currPtr == last);
}
