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XCEngine/engine/third_party/physx/snippets/snippetimmediatemode/SnippetImmediateMode.cpp

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feat(physics): wire physx sdk into build
2026-04-15 12:22:15 +08:00
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of NVIDIA CORPORATION nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2008-2025 NVIDIA Corporation. All rights reserved.
// ****************************************************************************
// This snippet illustrates the use of PhysX immediate mode.
//
// It creates a number of box stacks on a plane, and if rendering, allows the
// user to create new stacks and fire a ball from the camera position
// ****************************************************************************
#include <ctype.h>
#include "PxPhysicsAPI.h"
#include "../snippetcommon/SnippetPVD.h"
#include "../snippetutils/SnippetUtils.h"
#include "../snippetutils/SnippetImmUtils.h"
#include "foundation/PxArray.h"
#include "PxImmediateMode.h"
#include "extensions/PxMassProperties.h"
#include "../snippetcommon/SnippetPrint.h"
#include "extensions/PxRigidActorExt.h"
#define USE_TGS 1
//Enables whether we want persistent state caching (contact cache, friction caching) or not. Avoiding persistency results in one-shot collision detection and zero friction
//correlation but simplifies code by not longer needing to cache persistent pairs.
#define WITH_PERSISTENCY 1
//Toggles between using low-level inertia computation code or using the RigidBodyExt inertia computation code. The former can operate without the need for PxRigidDynamics being constructed.
#define USE_LOWLEVEL_INERTIA_COMPUTATION 1
//Toggles whether we batch constraints or not. Constraint batching is an optional process which can improve performance by grouping together independent constraints. These independent constraints
//can be solved in parallel by using multiple lanes of SIMD registers.
#define BATCH_CONTACTS 1
// Toggles whether we use PhysX' "immediate broadphase", or not. If we don't, a simple O(n^2) broadphase is used.
#define USE_IMMEDIATE_BROADPHASE 1
// Toggles profiling for the full step. Only for Windows.
#define PROFILE_STEP 0
using namespace physx;
using namespace immediate;
using namespace SnippetImmUtils;
static PxDefaultAllocator gAllocator;
static PxDefaultErrorCallback gErrorCallback;
static PxFoundation* gFoundation = NULL;
static PxPhysics* gPhysics = NULL;
static PxDefaultCpuDispatcher* gDispatcher = NULL;
static PxScene* gScene = NULL;
static PxMaterial* gMaterial = NULL;
static PxPvd* gPvd = NULL;
static physx::PxArray<PxConstraint*>* gConstraints = NULL;
static PxReal gStackZ = 10.0f;
//Enable to 1 to use centimeter units instead of meter units.
//Instructive to demonstrate which values used in immediate mode are unit-dependent
#define USE_CM_UNITS 0
#if !USE_CM_UNITS
static const PxReal gUnitScale = 1.0f;
//static float cameraSpeed = 1.0f;
#else
static const PxReal gUnitScale = 100.0f;
//static float cameraSpeed = 100.0f;
#endif
#if USE_IMMEDIATE_BROADPHASE && WITH_PERSISTENCY
static PxU32 gFrameIndex = 0;
#endif
#if WITH_PERSISTENCY
#if USE_IMMEDIATE_BROADPHASE
static PxAABBManager* gAABBManager = NULL;
struct PersistentPair
{
PersistentPair() {}
PersistentPair(PxU32 id0, PxU32 id1) : mID0(id0), mID1(id1) {}
PX_INLINE bool operator == (const PersistentPair& a) const
{
return a.mID0 == mID0 && a.mID1 == mID1;
}
PxU32 mID0;
PxU32 mID1;
};
struct PersistentPairData
{
PxRigidActor* actor0;
PxRigidActor* actor1;
PxCache cache;
PxU8* frictions;
PxU32 nbFrictions;
};
static PX_INLINE uint32_t PxComputeHash(const PersistentPair& p)
{
return PxComputeHash(uint64_t(p.mID0)|(uint64_t(p.mID1)<<32));
}
static PxHashMap<PersistentPair, PersistentPairData>* gPersistentPairs = NULL;
#else
namespace
{
struct PersistentContactPair
{
PxCache cache;
PxU8* frictions;
PxU32 nbFrictions;
};
}
static PxArray<PersistentContactPair>* allContactCache = NULL;
#endif
#endif
static TestCacheAllocator* gCacheAllocator = NULL;
static TestConstraintAllocator* gConstraintAllocator = NULL;
namespace
{
struct ContactPair
{
PxRigidActor* actor0;
PxRigidActor* actor1;
PxU32 idx0, idx1;
PxU32 startContactIndex;
PxU32 nbContacts;
};
class TestContactRecorder : public immediate::PxContactRecorder
{
PxArray<ContactPair>& mContactPairs;
PxArray<PxContactPoint>& mContactPoints;
PxRigidActor& mActor0;
PxRigidActor& mActor1;
PxU32 mIdx0, mIdx1;
bool mHasContacts;
public:
TestContactRecorder(PxArray<ContactPair>& contactPairs, PxArray<PxContactPoint>& contactPoints, PxRigidActor& actor0,
PxRigidActor& actor1, PxU32 idx0, PxU32 idx1) : mContactPairs(contactPairs), mContactPoints(contactPoints),
mActor0(actor0), mActor1(actor1), mIdx0(idx0), mIdx1(idx1), mHasContacts(false)
{
}
virtual bool recordContacts(const PxContactPoint* contactPoints, PxU32 nbContacts, PxU32 index)
{
PX_UNUSED(index);
{
ContactPair pair;
pair.actor0 = &mActor0;
pair.actor1 = &mActor1;
pair.nbContacts = nbContacts;
pair.startContactIndex = mContactPoints.size();
pair.idx0 = mIdx0;
pair.idx1 = mIdx1;
mContactPairs.pushBack(pair);
mHasContacts = true;
}
for (PxU32 c = 0; c < nbContacts; ++c)
{
//Fill in solver-specific data that our contact gen does not produce...
PxContactPoint point = contactPoints[c];
point.maxImpulse = PX_MAX_F32;
point.targetVel = PxVec3(0.0f);
point.staticFriction = 0.5f;
point.dynamicFriction = 0.5f;
point.restitution = 0.0f;
point.damping = 0.0f;
point.materialFlags = 0;
mContactPoints.pushBack(point);
}
return true;
}
PX_FORCE_INLINE bool hasContacts() const { return mHasContacts; }
private:
PX_NOCOPY(TestContactRecorder)
};
}
static bool generateContacts( const PxGeometryHolder& geom0, const PxGeometryHolder& geom1, PxRigidActor& actor0, PxRigidActor& actor1, PxCacheAllocator& cacheAllocator,
PxArray<PxContactPoint>& contactPoints, PxArray<ContactPair>& contactPairs, PxU32 idx0, PxU32 idx1, PxCache& cache)
{
const PxTransform tr0 = actor0.getGlobalPose();
const PxTransform tr1 = actor1.getGlobalPose();
TestContactRecorder recorder(contactPairs, contactPoints, actor0, actor1, idx0, idx1);
const PxGeometry* pxGeom0 = &geom0.any();
const PxGeometry* pxGeom1 = &geom1.any();
physx::immediate::PxGenerateContacts(&pxGeom0, &pxGeom1, &tr0, &tr1, &cache, 1, recorder, gUnitScale*0.04f, gUnitScale*0.01f, gUnitScale, cacheAllocator);
return recorder.hasContacts();
}
static PxRigidDynamic* createDynamic(const PxTransform& t, const PxGeometry& geometry, const PxVec3& velocity=PxVec3(0))
{
PxRigidDynamic* dynamic = PxCreateDynamic(*gPhysics, t, geometry, *gMaterial, 10.0f);
dynamic->setAngularDamping(0.5f);
dynamic->setLinearVelocity(velocity);
gScene->addActor(*dynamic);
return dynamic;
}
static void updateInertia(PxRigidBody* body, PxReal density)
{
#if !USE_LOWLEVEL_INERTIA_COMPUTATION
PX_UNUSED(density);
//Compute the inertia of the rigid body using the helper function in PxRigidBodyExt
PxRigidBodyExt::updateMassAndInertia(*body, 10.0f);
#else
//Compute the inertia/mass of the bodies using the more low-level PxMassProperties interface
//This was written for readability rather than performance. Complexity can be avoided if you know that you are dealing with a single shape body
PxU32 nbShapes = body->getNbShapes();
//Keep track of an array of inertia tensors and local poses.
physx::PxArray<PxMassProperties> inertias;
physx::PxArray<PxTransform> localPoses;
for (PxU32 a = 0; a < nbShapes; ++a)
{
PxShape* shape;
body->getShapes(&shape, 1, a);
//(1) initialize an inertia tensor based on the shape's geometry
PxMassProperties inertia(shape->getGeometry());
//(2) Scale the inertia tensor based on density. If you use a single density instead of a density per-shape, this could be performed just prior to
//extracting the massSpaceInertiaTensor
inertia = inertia * density;
inertias.pushBack(inertia);
localPoses.pushBack(shape->getLocalPose());
}
//(3)Sum all the inertia tensors - can be skipped if the shape count is 1
PxMassProperties inertia = PxMassProperties::sum(inertias.begin(), localPoses.begin(), inertias.size());
//(4)Get the diagonalized inertia component and frame of the mass space orientation
PxQuat orient;
const PxVec3 diagInertia = PxMassProperties::getMassSpaceInertia(inertia.inertiaTensor, orient);
//(4) Set properties on the rigid body
body->setMass(inertia.mass);
body->setCMassLocalPose(PxTransform(inertia.centerOfMass, orient));
body->setMassSpaceInertiaTensor(diagInertia);
#endif
}
/*static*/ void createStack(const PxTransform& t, PxU32 size, PxReal halfExtent)
{
PxShape* shape = gPhysics->createShape(PxBoxGeometry(halfExtent, halfExtent, halfExtent), *gMaterial);
for (PxU32 i = 0; i<size; i++)
{
for (PxU32 j = 0; j<size - i; j++)
{
PxTransform localTm(PxVec3(PxReal(j * 2) - PxReal(size - i), PxReal(i * 2 + 1), 0) * halfExtent);
PxRigidDynamic* body = gPhysics->createRigidDynamic(t.transform(localTm));
body->attachShape(*shape);
updateInertia(body, 10.f);
gScene->addActor(*body);
}
}
shape->release();
}
struct Triangle
{
PxU32 ind0, ind1, ind2;
};
static PxTriangleMesh* createMeshGround()
{
const PxU32 gridSize = 8;
const PxReal gridStep = 512.f / (gridSize-1);
PxVec3 verts[gridSize * gridSize];
const PxU32 nbTriangles = 2 * (gridSize - 1) * (gridSize-1);
Triangle indices[nbTriangles];
for (PxU32 a = 0; a < gridSize; ++a)
{
for (PxU32 b = 0; b < gridSize; ++b)
{
verts[a * gridSize + b] = PxVec3(-400.f + b*gridStep, 0.f, -400.f + a*gridStep);
}
}
for (PxU32 a = 0; a < (gridSize-1); ++a)
{
for (PxU32 b = 0; b < (gridSize-1); ++b)
{
Triangle& tri0 = indices[(a * (gridSize-1) + b) * 2];
Triangle& tri1 = indices[((a * (gridSize-1) + b) * 2) + 1];
tri0.ind0 = a * gridSize + b + 1;
tri0.ind1 = a * gridSize + b;
tri0.ind2 = (a + 1) * gridSize + b + 1;
tri1.ind0 = (a + 1) * gridSize + b + 1;
tri1.ind1 = a * gridSize + b;
tri1.ind2 = (a + 1) * gridSize + b;
}
}
PxTriangleMeshDesc meshDesc;
meshDesc.points.data = verts;
meshDesc.points.count = gridSize * gridSize;
meshDesc.points.stride = sizeof(PxVec3);
meshDesc.triangles.count = nbTriangles;
meshDesc.triangles.data = indices;
meshDesc.triangles.stride = sizeof(Triangle);
PxCookingParams cookingParams(gPhysics->getTolerancesScale());
PxTriangleMesh* triMesh = PxCreateTriangleMesh(cookingParams, meshDesc, gPhysics->getPhysicsInsertionCallback());
return triMesh;
}
#if WITH_PERSISTENCY && USE_IMMEDIATE_BROADPHASE
static void createBroadPhase()
{
PxBroadPhaseDesc bpDesc(PxBroadPhaseType::eABP);
PxBroadPhase* bp = PxCreateBroadPhase(bpDesc);
gAABBManager = PxCreateAABBManager(*bp);
gPersistentPairs = new PxHashMap<PersistentPair, PersistentPairData>;
}
static void releaseBroadPhase()
{
PxBroadPhase* bp = &gAABBManager->getBroadPhase();
PX_RELEASE(gAABBManager);
PX_RELEASE(bp);
delete gPersistentPairs;
}
#endif
static void updateContactPairs()
{
#if WITH_PERSISTENCY
#if USE_IMMEDIATE_BROADPHASE
// In this simple snippet we just recreate the broadphase structure here
releaseBroadPhase();
createBroadPhase();
gFrameIndex = 0;
#else
allContactCache->clear();
const PxU32 nbDynamic = gScene->getNbActors(PxActorTypeFlag::eRIGID_DYNAMIC);
const PxU32 nbStatic = gScene->getNbActors(PxActorTypeFlag::eRIGID_STATIC);
const PxU32 totalPairs = (nbDynamic * (nbDynamic - 1)) / 2 + nbDynamic * nbStatic;
allContactCache->resize(totalPairs);
for (PxU32 a = 0; a < totalPairs; ++a)
{
(*allContactCache)[a].frictions = NULL;
(*allContactCache)[a].nbFrictions = 0;
(*allContactCache)[a].cache.mCachedData = 0;
(*allContactCache)[a].cache.mCachedSize = 0;
(*allContactCache)[a].cache.mManifoldFlags = 0;
(*allContactCache)[a].cache.mPairData = 0;
}
#endif
#endif
}
void initPhysics(bool /*interactive*/)
{
gFoundation = PxCreateFoundation(PX_PHYSICS_VERSION, gAllocator, gErrorCallback);
gPvd = PxCreatePvd(*gFoundation);
PxPvdTransport* transport = PxDefaultPvdSocketTransportCreate(PVD_HOST, 5425, 10);
gPvd->connect(*transport, PxPvdInstrumentationFlag::ePROFILE);
gPhysics = PxCreatePhysics(PX_PHYSICS_VERSION, *gFoundation, PxTolerancesScale(), true, gPvd);
PxSceneDesc sceneDesc(gPhysics->getTolerancesScale());
sceneDesc.gravity = PxVec3(0.0f, -9.81f, 0.0f)*gUnitScale;
gDispatcher = PxDefaultCpuDispatcherCreate(0);
sceneDesc.cpuDispatcher = gDispatcher;
sceneDesc.filterShader = PxDefaultSimulationFilterShader;
gScene = gPhysics->createScene(sceneDesc);
gMaterial = gPhysics->createMaterial(0.5f, 0.5f, 0.2f);
gConstraints = new physx::PxArray<PxConstraint*>();
const bool useGroundMesh = true; // Use a triangle mesh or a plane for the ground
if(useGroundMesh)
{
PxTriangleMesh* mesh = createMeshGround();
PxTriangleMeshGeometry geom(mesh);
PxRigidStatic* groundMesh = gPhysics->createRigidStatic(PxTransform(PxVec3(0, 2, 0)));
PxRigidActorExt::createExclusiveShape(*groundMesh, geom, *gMaterial);
gScene->addActor(*groundMesh);
}
else
{
PxRigidStatic* groundPlane = PxCreatePlane(*gPhysics, PxPlane(0,1,0,0), *gMaterial);
gScene->addActor(*groundPlane);
}
for (PxU32 i = 0; i<4; i++)
createStack(PxTransform(PxVec3(0, 2, gStackZ -= 10.0f*gUnitScale)), 20, gUnitScale);
PxRigidDynamic* ball = createDynamic(PxTransform(PxVec3(0, 20, 100)*gUnitScale), PxSphereGeometry(2 * gUnitScale), PxVec3(0, -25, -100)*gUnitScale);
PxRigidDynamic* ball2 = createDynamic(PxTransform(PxVec3(0, 24, 100)*gUnitScale), PxSphereGeometry(2 * gUnitScale), PxVec3(0, -25, -100)*gUnitScale);
PxRigidDynamic* ball3 = createDynamic(PxTransform(PxVec3(0, 27, 100)*gUnitScale), PxSphereGeometry(2 * gUnitScale), PxVec3(0, -25, -100)*gUnitScale);
updateInertia(ball, 1000.f);
updateInertia(ball2, 1000.f);
PxD6Joint* joint = PxD6JointCreate(*gPhysics, ball, PxTransform(PxVec3(0, 4, 0)*gUnitScale), ball2, PxTransform(PxVec3(0, -2, 0)*gUnitScale));
PxD6Joint* joint2 = PxD6JointCreate(*gPhysics, ball2, PxTransform(PxVec3(0, 4, 0)*gUnitScale), ball3, PxTransform(PxVec3(0, -2, 0)*gUnitScale));
gConstraints->pushBack(joint->getConstraint());
gConstraints->pushBack(joint2->getConstraint());
gCacheAllocator = new TestCacheAllocator;
gConstraintAllocator = new TestConstraintAllocator;
#if WITH_PERSISTENCY
#if USE_IMMEDIATE_BROADPHASE
createBroadPhase();
#else
allContactCache = new PxArray<PersistentContactPair>;
#endif
#endif
updateContactPairs();
}
void stepPhysics(bool /*interactive*/)
{
#if PROFILE_STEP
PxU64 time = __rdtsc();
#endif
gCacheAllocator->reset();
gConstraintAllocator->release();
const PxU32 nbStatics = gScene->getNbActors(PxActorTypeFlag::eRIGID_STATIC);
const PxU32 nbDynamics = gScene->getNbActors(PxActorTypeFlag::eRIGID_DYNAMIC);
const PxU32 totalActors = nbDynamics + nbStatics;
PxArray<ContactPair> activeContactPairs;
PxArray<PxContactPoint> contactPoints;
activeContactPairs.reserve(4 * totalActors);
PxArray<PxActor*> actors(totalActors);
PxArray<PxBounds3> shapeBounds(totalActors+1);
PxArray<PxGeometryHolder> mGeometries(totalActors);
#if USE_TGS
PxArray<PxTGSSolverBodyVel> bodies(totalActors);
PxArray<PxTGSSolverBodyData> bodyData(totalActors);
PxArray<PxTGSSolverBodyTxInertia> txInertia(totalActors);
PxArray<PxTransform> globalPoses(totalActors);
#else
PxArray<PxSolverBody> bodies(totalActors);
PxArray<PxSolverBodyData> bodyData(totalActors);
#endif
#if USE_IMMEDIATE_BROADPHASE && !WITH_PERSISTENCY
PxArray<PxBpIndex> handles(totalActors);
PxArray<PxBpFilterGroup> groups(totalActors);
PxArray<float> distances(totalActors);
#endif
gScene->getActors(PxActorTypeFlag::eRIGID_DYNAMIC, actors.begin(), nbDynamics);
gScene->getActors(PxActorTypeFlag::eRIGID_STATIC, actors.begin() + nbDynamics, nbStatics);
#if USE_IMMEDIATE_BROADPHASE && WITH_PERSISTENCY
gFrameIndex++;
#endif
//Now do collision detection...Brute force every dynamic against every dynamic/static
for (PxU32 a = 0; a < totalActors; ++a)
{
PxRigidActor* actor = actors[a]->is<PxRigidActor>();
PxShape* shape;
actor->getShapes(&shape, 1);
//Compute the AABBs. We inflate these by 2cm margins
shapeBounds[a] = PxShapeExt::getWorldBounds(*shape, *actor, 1.f);
shapeBounds[a].minimum -= PxVec3(0.02f)*gUnitScale;
shapeBounds[a].maximum += PxVec3(0.02f)*gUnitScale;
mGeometries[a].storeAny(shape->getGeometry());
#if USE_IMMEDIATE_BROADPHASE
#if WITH_PERSISTENCY
if(gFrameIndex==1)
{
const PxBpFilterGroup group = a < nbDynamics ? PxGetBroadPhaseDynamicFilterGroup(a) : PxGetBroadPhaseStaticFilterGroup();
gAABBManager->addObject(a, shapeBounds[a], group);
}
else if(a < nbDynamics)
{
gAABBManager->updateObject(a, &shapeBounds[a]);
}
#else
handles[a] = a;
distances[a]= 0.0f;
if(a < nbDynamics)
groups[a] = PxGetBroadPhaseDynamicFilterGroup(a);
else
groups[a] = PxGetBroadPhaseStaticFilterGroup();
#endif
#endif
}
#if USE_IMMEDIATE_BROADPHASE
{
PxBroadPhaseResults results;
#if WITH_PERSISTENCY
gAABBManager->updateAndFetchResults(results);
const PxU32 nbCreatedPairs = results.mNbCreatedPairs;
for(PxU32 i=0;i<nbCreatedPairs;i++)
{
const PxU32 id0 = results.mCreatedPairs[i].mID0;
const PxU32 id1 = results.mCreatedPairs[i].mID1;
const PersistentPair currentPair(id0, id1);
PersistentPairData data;
data.actor0 = actors[id0]->is<PxRigidActor>();
data.actor1 = actors[id1]->is<PxRigidActor>();
data.frictions = NULL;
data.nbFrictions = 0;
data.cache = PxCache();
bool b = gPersistentPairs->insert(currentPair, data);
PX_ASSERT(b);
PX_UNUSED(b);
}
const PxU32 nbDeletedPairs = results.mNbDeletedPairs;
for(PxU32 i=0;i<nbDeletedPairs;i++)
{
const PxU32 id0 = results.mDeletedPairs[i].mID0;
const PxU32 id1 = results.mDeletedPairs[i].mID1;
const PersistentPair currentPair(id0, id1);
PxHashMap<PersistentPair, PersistentPairData>::Entry removedEntry;
bool b = gPersistentPairs->erase(currentPair, removedEntry);
PX_ASSERT(b);
PX_UNUSED(b);
}
#else
PxBroadPhaseDesc bpDesc(PxBroadPhaseType::eABP);
PxBroadPhase* bp = PxCreateBroadPhase(bpDesc);
const PxBroadPhaseUpdateData updateData(handles.begin(), totalActors, NULL, 0, NULL, 0, shapeBounds.begin(), groups.begin(), distances.begin(), totalActors);
bp->update(results, updateData);
const PxU32 nbPairs = results.mNbCreatedPairs;
for(PxU32 i=0;i<nbPairs;i++)
{
const PxU32 id0 = results.mCreatedPairs[i].mID0;
const PxU32 id1 = results.mCreatedPairs[i].mID1;
ContactPair pair;
pair.actor0 = actors[id0]->is<PxRigidActor>();
pair.actor1 = actors[id1]->is<PxRigidActor>();
pair.idx0 = id0;
pair.idx1 = id1;
activeContactPairs.pushBack(pair);
}
PX_RELEASE(bp);
#endif
}
#else
{
//Broad phase for active pairs...
for (PxU32 a = 0; a < nbDynamics; ++a)
{
PxRigidDynamic* dyn0 = actors[a]->is<PxRigidDynamic>();
for (PxU32 b = a + 1; b < totalActors; ++b)
{
PxRigidActor* actor1 = actors[b]->is<PxRigidActor>();
if (shapeBounds[a].intersects(shapeBounds[b]))
{
ContactPair pair;
pair.actor0 = dyn0;
pair.actor1 = actor1;
pair.idx0 = a;
pair.idx1 = b;
activeContactPairs.pushBack(pair);
}
#if WITH_PERSISTENCY
else
{
const PxU32 startIndex = a == 0 ? 0 : (a * totalActors) - (a * (a + 1)) / 2;
PersistentContactPair& persistentData = (*allContactCache)[startIndex + (b - a - 1)];
//No collision detection performed at all so clear contact cache and friction data
persistentData.frictions = NULL;
persistentData.nbFrictions = 0;
persistentData.cache = PxCache();
}
#endif
}
}
}
#endif
#if USE_IMMEDIATE_BROADPHASE && WITH_PERSISTENCY
const PxU32 nbActivePairs = gPersistentPairs->size();
activeContactPairs.forceSize_Unsafe(0);
contactPoints.reserve(4 * nbActivePairs);
for(PxHashMap<PersistentPair, PersistentPairData>::Iterator iter = gPersistentPairs->getIterator(); !iter.done(); ++iter)
{
const PxU32 id0 = iter->first.mID0;
const PxU32 id1 = iter->first.mID1;
PxRigidActor* dyn0 = iter->second.actor0;
const PxGeometryHolder& holder0 = mGeometries[id0];
PxRigidActor* actor1 = iter->second.actor1;
const PxGeometryHolder& holder1 = mGeometries[id1];
if (!generateContacts(holder0, holder1, *dyn0, *actor1, *gCacheAllocator, contactPoints, activeContactPairs, id0, id1, iter->second.cache))
{
//Contact generation run but no touches found so clear cached friction data
iter->second.frictions = NULL;
iter->second.nbFrictions = 0;
}
}
#else
const PxU32 nbActivePairs = activeContactPairs.size();
ContactPair* activePairs = activeContactPairs.begin();
activeContactPairs.forceSize_Unsafe(0);
contactPoints.reserve(4 * nbActivePairs);
for (PxU32 a = 0; a < nbActivePairs; ++a)
{
const ContactPair& pair = activePairs[a];
PxRigidActor* dyn0 = pair.actor0;
const PxGeometryHolder& holder0 = mGeometries[pair.idx0];
PxRigidActor* actor1 = pair.actor1;
const PxGeometryHolder& holder1 = mGeometries[pair.idx1];
#if WITH_PERSISTENCY
const PxU32 startIndex = pair.idx0 == 0 ? 0 : (pair.idx0 * totalActors) - (pair.idx0 * (pair.idx0 + 1)) / 2;
PersistentContactPair& persistentData = (*allContactCache)[startIndex + (pair.idx1 - pair.idx0 - 1)];
if (!generateContacts(holder0, holder1, *dyn0, *actor1, *gCacheAllocator, contactPoints, activeContactPairs, pair.idx0, pair.idx1, persistentData.cache))
{
//Contact generation run but no touches found so clear cached friction data
persistentData.frictions = NULL;
persistentData.nbFrictions = 0;
}
#else
PxCache cache;
generateContacts(holder0, holder1, *dyn0, *actor1, *gCacheAllocator, contactPoints, activeContactPairs, pair.idx0, pair.idx1, cache);
#endif
}
#endif
const PxReal dt = 1.f / 60.f;
const PxReal invDt = 60.f;
const PxU32 nbPositionIterations = 4;
const PxU32 nbVelocityIterations = 1;
#if USE_TGS
const PxReal stepDt = dt/PxReal(nbPositionIterations);
const PxReal invStepDt = invDt * PxReal(nbPositionIterations);
#endif
const PxVec3 gravity(0.f, -9.8f* gUnitScale, 0.f);
//Construct solver bodies
for (PxU32 a = 0; a < nbDynamics; ++a)
{
PxRigidDynamic* dyn = actors[a]->is<PxRigidDynamic>();
immediate::PxRigidBodyData data;
data.linearVelocity = dyn->getLinearVelocity();
data.angularVelocity = dyn->getAngularVelocity();
data.invMass = dyn->getInvMass();
data.invInertia = dyn->getMassSpaceInvInertiaTensor();
data.body2World = dyn->getGlobalPose();
data.maxDepenetrationVelocity = dyn->getMaxDepenetrationVelocity();
data.maxContactImpulse = dyn->getMaxContactImpulse();
data.linearDamping = dyn->getLinearDamping();
data.angularDamping = dyn->getAngularDamping();
data.maxLinearVelocitySq = 100.f*100.f*gUnitScale*gUnitScale;
data.maxAngularVelocitySq = 7.f*7.f;
#if USE_TGS
physx::immediate::PxConstructSolverBodiesTGS(&data, &bodies[a], &txInertia[a], &bodyData[a], 1, gravity, dt);
globalPoses[a] = data.body2World;
#else
physx::immediate::PxConstructSolverBodies(&data, &bodyData[a], 1, gravity, dt);
#endif
dyn->userData = reinterpret_cast<void*>(size_t(a));
}
//Construct static bodies
for (PxU32 a = nbDynamics; a < totalActors; ++a)
{
PxRigidStatic* sta = actors[a]->is<PxRigidStatic>();
#if USE_TGS
physx::immediate::PxConstructStaticSolverBodyTGS(sta->getGlobalPose(), bodies[a], txInertia[a], bodyData[a]);
globalPoses[a] = sta->getGlobalPose();
#else
physx::immediate::PxConstructStaticSolverBody(sta->getGlobalPose(), bodyData[a]);
#endif
sta->userData = reinterpret_cast<void*>(size_t(a));
}
PxArray<PxSolverConstraintDesc> descs(activeContactPairs.size() + gConstraints->size());
for (PxU32 a = 0; a < activeContactPairs.size(); ++a)
{
PxSolverConstraintDesc& desc = descs[a];
ContactPair& pair = activeContactPairs[a];
//Set body pointers and bodyData idxs
#if USE_TGS
desc.tgsBodyA = &bodies[pair.idx0];
desc.tgsBodyB = &bodies[pair.idx1];
#else
desc.bodyA = &bodies[pair.idx0];
desc.bodyB = &bodies[pair.idx1];
#endif
desc.bodyADataIndex = pair.idx0;
desc.bodyBDataIndex = pair.idx1;
desc.linkIndexA = PxSolverConstraintDesc::RIGID_BODY;
desc.linkIndexB = PxSolverConstraintDesc::RIGID_BODY;
//Cache pointer to our contact data structure and identify which type of constraint this is. We'll need this later after batching.
//We store our pointer in the desc.constraint field as this field is ignored by PxBatchConstraints. It will later be overwritten by PxCreateContactConstraints.
//If we choose not to perform batching and instead just create a single header per-pair, then this would not be necessary because
//the constraintDescs would not have been reordered
desc.constraint = reinterpret_cast<PxU8*>(&pair);
desc.constraintType = PxSolverConstraintDesc::eCONTACT_CONSTRAINT;
}
for (PxU32 a = 0; a < gConstraints->size(); ++a)
{
PxConstraint* constraint = (*gConstraints)[a];
PxSolverConstraintDesc& desc = descs[activeContactPairs.size() + a];
PxRigidActor* actor0, *actor1;
constraint->getActors(actor0, actor1);
const PxU32 id0 = PxU32(size_t(actor0->userData));
const PxU32 id1 = PxU32(size_t(actor1->userData));
#if USE_TGS
desc.tgsBodyA = &bodies[id0];
desc.tgsBodyB = &bodies[id1];
#else
desc.bodyA = &bodies[id0];
desc.bodyB = &bodies[id1];
#endif
desc.bodyADataIndex = PxU16(id0);
desc.bodyBDataIndex = PxU16(id1);
desc.linkIndexA = PxSolverConstraintDesc::RIGID_BODY;
desc.linkIndexB = PxSolverConstraintDesc::RIGID_BODY;
desc.constraint = reinterpret_cast<PxU8*>(constraint);
desc.constraintType = PxSolverConstraintDesc::eJOINT_CONSTRAINT;
}
PxArray<PxConstraintBatchHeader> headers(descs.size());
PxArray<PxReal> contactForces(contactPoints.size());
//Technically, you can batch the contacts and joints all at once using a single call but doing so mixes them in the orderedDescs array, which means that it is impossible to
//batch all contact or all joint dispatches into a single call. While we don't do this in this snippet (we instead process a single header at a time), our approach could be extended to
//dispatch all contact headers at once if that was necessary.
#if BATCH_CONTACTS
PxArray<PxSolverConstraintDesc> tempOrderedDescs(descs.size());
physx::PxArray<PxSolverConstraintDesc>& orderedDescs = tempOrderedDescs;
#if USE_TGS
//1 batch the contacts
const PxU32 nbContactHeaders = physx::immediate::PxBatchConstraintsTGS(descs.begin(), activeContactPairs.size(), bodies.begin(), nbDynamics, headers.begin(), orderedDescs.begin());
//2 batch the joints...
const PxU32 nbJointHeaders = physx::immediate::PxBatchConstraintsTGS(descs.begin() + activeContactPairs.size(), gConstraints->size(), bodies.begin(), nbDynamics, headers.begin() + nbContactHeaders, orderedDescs.begin() + activeContactPairs.size());
#else
//1 batch the contacts
const PxU32 nbContactHeaders = physx::immediate::PxBatchConstraints(descs.begin(), activeContactPairs.size(), bodies.begin(), nbDynamics, headers.begin(), orderedDescs.begin());
//2 batch the joints...
const PxU32 nbJointHeaders = physx::immediate::PxBatchConstraints(descs.begin() + activeContactPairs.size(), gConstraints->size(), bodies.begin(), nbDynamics, headers.begin() + nbContactHeaders, orderedDescs.begin() + activeContactPairs.size());
#endif
#else
physx::PxArray<PxSolverConstraintDesc>& orderedDescs = descs;
//We are bypassing the constraint batching so we create dummy PxConstraintBatchHeaders
const PxU32 nbContactHeaders = activeContactPairs.size();
const PxU32 nbJointHeaders = gConstraints->size();
for (PxU32 i = 0; i < nbContactHeaders; ++i)
{
PxConstraintBatchHeader& hdr = headers[i];
hdr.startIndex = i;
hdr.stride = 1;
hdr.constraintType = PxSolverConstraintDesc::eCONTACT_CONSTRAINT;
}
for (PxU32 i = 0; i < nbJointHeaders; ++i)
{
PxConstraintBatchHeader& hdr = headers[nbContactHeaders+i];
hdr.startIndex = i;
hdr.stride = 1;
hdr.constraintType = PxSolverConstraintDesc::eJOINT_CONSTRAINT;
}
#endif
const PxU32 totalHeaders = nbContactHeaders + nbJointHeaders;
headers.forceSize_Unsafe(totalHeaders);
//1 - Create all the contact constraints. We do this by looping over all the headers and, for each header, constructing the PxSolverContactDesc objects, then creating that contact constraint.
//We could alternatively create all the PxSolverContactDesc objects in a single pass, then create batch create that constraint
for (PxU32 i = 0; i < nbContactHeaders; ++i)
{
PxConstraintBatchHeader& header = headers[i];
PX_ASSERT(header.constraintType == PxSolverConstraintDesc::eCONTACT_CONSTRAINT);
#if USE_TGS
PxTGSSolverContactDesc contactDescs[4];
#else
PxSolverContactDesc contactDescs[4];
#endif
#if WITH_PERSISTENCY
const ContactPair* pairs[4];
#endif
for (PxU32 a = 0; a < header.stride; ++a)
{
PxSolverConstraintDesc& constraintDesc = orderedDescs[header.startIndex + a];
#if USE_TGS
PxTGSSolverContactDesc& contactDesc = contactDescs[a];
#else
PxSolverContactDesc& contactDesc = contactDescs[a];
#endif
PxMemZero(&contactDesc, sizeof(contactDesc));
//Extract the contact pair that we saved in this structure earlier.
const ContactPair& pair = *reinterpret_cast<const ContactPair*>(constraintDesc.constraint);
#if WITH_PERSISTENCY
pairs[a] = &pair;
#endif
#if USE_TGS
contactDesc.body0 = constraintDesc.tgsBodyA;
contactDesc.body1 = constraintDesc.tgsBodyB;
contactDesc.bodyData0 = &bodyData[constraintDesc.bodyADataIndex];
contactDesc.bodyData1 = &bodyData[constraintDesc.bodyBDataIndex];
contactDesc.body0TxI = &txInertia[constraintDesc.bodyADataIndex];
contactDesc.body1TxI = &txInertia[constraintDesc.bodyBDataIndex];
//This may seem redundant but the bodyFrame is not defined by the bodyData object when using articulations. This
//example does not use articulations.
contactDesc.bodyFrame0 = globalPoses[constraintDesc.bodyADataIndex];
contactDesc.bodyFrame1 = globalPoses[constraintDesc.bodyBDataIndex];
#else
contactDesc.body0 = constraintDesc.bodyA;
contactDesc.body1 = constraintDesc.bodyB;
contactDesc.data0 = &bodyData[constraintDesc.bodyADataIndex];
contactDesc.data1 = &bodyData[constraintDesc.bodyBDataIndex];
//This may seem redundant but the bodyFrame is not defined by the bodyData object when using articulations. This
//example does not use articulations.
contactDesc.bodyFrame0 = contactDesc.data0->body2World;
contactDesc.bodyFrame1 = contactDesc.data1->body2World;
#endif
contactDesc.contactForces = &contactForces[pair.startContactIndex];
contactDesc.contacts = &contactPoints[pair.startContactIndex];
contactDesc.numContacts = pair.nbContacts;
#if WITH_PERSISTENCY
#if USE_IMMEDIATE_BROADPHASE
const PersistentPair currentPair(pair.idx0, pair.idx1);
const PxHashMap<PersistentPair, PersistentPairData>::Entry* e = gPersistentPairs->find(currentPair);
contactDesc.frictionPtr = e->second.frictions;
contactDesc.frictionCount = PxU8(e->second.nbFrictions);
#else
const PxU32 startIndex = pair.idx0 == 0 ? 0 : (pair.idx0 * totalActors) - (pair.idx0 * (pair.idx0 + 1)) / 2;
contactDesc.frictionPtr = (*allContactCache)[startIndex + (pair.idx1 - pair.idx0 - 1)].frictions;
contactDesc.frictionCount = PxU8((*allContactCache)[startIndex + (pair.idx1 - pair.idx0 - 1)].nbFrictions);
#endif
#else
contactDesc.frictionPtr = NULL;
contactDesc.frictionCount = 0;
#endif
contactDesc.shapeInteraction = NULL;
contactDesc.maxCCDSeparation = PX_MAX_F32;
contactDesc.bodyState0 = PxSolverConstraintPrepDescBase::eDYNAMIC_BODY;
contactDesc.bodyState1 = pair.actor1->is<PxRigidDynamic>() ? PxSolverConstraintPrepDescBase::eDYNAMIC_BODY : PxSolverConstraintPrepDescBase::eSTATIC_BODY;
contactDesc.desc = &constraintDesc;
contactDesc.invMassScales.angular0 = contactDesc.invMassScales.angular1 = contactDesc.invMassScales.linear0 = contactDesc.invMassScales.linear1 = 1.f;
}
#if USE_TGS
immediate::PxCreateContactConstraintsTGS(&header, 1, contactDescs, *gConstraintAllocator, invStepDt, invDt, -2.f * gUnitScale, 0.04f * gUnitScale, 0.025f * gUnitScale);
#else
immediate::PxCreateContactConstraints(&header, 1, contactDescs, *gConstraintAllocator, invDt, -2.f * gUnitScale, 0.04f * gUnitScale, 0.025f * gUnitScale);
#endif
#if WITH_PERSISTENCY
for (PxU32 a = 0; a < header.stride; ++a)
{
//Cache friction information...
#if USE_TGS
PxTGSSolverContactDesc& contactDesc = contactDescs[a];
#else
PxSolverContactDesc& contactDesc = contactDescs[a];
#endif
//PxSolverConstraintDesc& constraintDesc = orderedDescs[header.startIndex + a];
const ContactPair& pair = *pairs[a];
#if USE_IMMEDIATE_BROADPHASE
const PersistentPair currentPair(pair.idx0, pair.idx1);
PxHashMap<PersistentPair, PersistentPairData>::Entry* e = const_cast<PxHashMap<PersistentPair, PersistentPairData>::Entry*>(gPersistentPairs->find(currentPair));
e->second.frictions = contactDesc.frictionPtr;
e->second.nbFrictions = contactDesc.frictionCount;
#else
const PxU32 startIndex = pair.idx0 == 0 ? 0 : (pair.idx0 * totalActors) - (pair.idx0 * (pair.idx0 + 1)) / 2;
(*allContactCache)[startIndex + (pair.idx1 - pair.idx0 - 1)].frictions = contactDesc.frictionPtr;
(*allContactCache)[startIndex + (pair.idx1 - pair.idx0 - 1)].nbFrictions = contactDesc.frictionCount;
#endif
}
#endif
}
for (PxU32 i = nbContactHeaders; i < totalHeaders; ++i)
{
PxConstraintBatchHeader& header = headers[i];
PX_ASSERT(header.constraintType == PxSolverConstraintDesc::eJOINT_CONSTRAINT);
{
#if USE_TGS
PxTGSSolverConstraintPrepDesc jointDescs[4];
#else
PxSolverConstraintPrepDesc jointDescs[4];
#endif
PxConstraint* constraints[4];
header.startIndex += activeContactPairs.size();
for (PxU32 a = 0; a < header.stride; ++a)
{
PxSolverConstraintDesc& constraintDesc = orderedDescs[header.startIndex + a];
//Extract the contact pair that we saved in this structure earlier.
PxConstraint& constraint = *reinterpret_cast<PxConstraint*>(constraintDesc.constraint);
constraints[a] = &constraint;
#if USE_TGS
PxTGSSolverConstraintPrepDesc& jointDesc = jointDescs[a];
jointDesc.body0 = constraintDesc.tgsBodyA;
jointDesc.body1 = constraintDesc.tgsBodyB;
jointDesc.bodyData0 = &bodyData[constraintDesc.bodyADataIndex];
jointDesc.bodyData1 = &bodyData[constraintDesc.bodyBDataIndex];
jointDesc.body0TxI = &txInertia[constraintDesc.bodyADataIndex];
jointDesc.body1TxI = &txInertia[constraintDesc.bodyBDataIndex];
//This may seem redundant but the bodyFrame is not defined by the bodyData object when using articulations. This
//example does not use articulations.
jointDesc.bodyFrame0 = globalPoses[constraintDesc.bodyADataIndex];
jointDesc.bodyFrame1 = globalPoses[constraintDesc.bodyBDataIndex];
#else
PxSolverConstraintPrepDesc& jointDesc = jointDescs[a];
jointDesc.body0 = constraintDesc.bodyA;
jointDesc.body1 = constraintDesc.bodyB;
jointDesc.data0 = &bodyData[constraintDesc.bodyADataIndex];
jointDesc.data1 = &bodyData[constraintDesc.bodyBDataIndex];
//This may seem redundant but the bodyFrame is not defined by the bodyData object when using articulations. This
//example does not use articulations.
jointDesc.bodyFrame0 = jointDesc.data0->body2World;
jointDesc.bodyFrame1 = jointDesc.data1->body2World;
#endif
PxRigidActor* actor0, *actor1;
constraint.getActors(actor0, actor1);
jointDesc.bodyState0 = PxSolverConstraintPrepDescBase::eDYNAMIC_BODY;
jointDesc.bodyState1 = actor1 == NULL ? PxSolverConstraintPrepDescBase::eSTATIC_BODY : actor1->is<PxRigidDynamic>() ? PxSolverConstraintPrepDescBase::eDYNAMIC_BODY : PxSolverConstraintPrepDescBase::eSTATIC_BODY;
jointDesc.desc = &constraintDesc;
jointDesc.invMassScales.angular0 = jointDesc.invMassScales.angular1 = jointDesc.invMassScales.linear0 = jointDesc.invMassScales.linear1 = 1.f;
jointDesc.writeback = NULL;
constraint.getBreakForce(jointDesc.linBreakForce, jointDesc.angBreakForce);
jointDesc.minResponseThreshold = constraint.getMinResponseThreshold();
jointDesc.disablePreprocessing = !!(constraint.getFlags() & PxConstraintFlag::eDISABLE_PREPROCESSING);
jointDesc.improvedSlerp = !!(constraint.getFlags() & PxConstraintFlag::eIMPROVED_SLERP);
jointDesc.driveLimitsAreForces = !!(constraint.getFlags() & PxConstraintFlag::eDRIVE_LIMITS_ARE_FORCES);
}
#if USE_TGS
immediate::PxCreateJointConstraintsWithShadersTGS(&header, 1, constraints, jointDescs, *gConstraintAllocator, stepDt, dt, invStepDt, invDt, 1.f);
#else
immediate::PxCreateJointConstraintsWithShaders(&header, 1, constraints, jointDescs, *gConstraintAllocator, dt, invDt);
#endif
}
}
#if USE_TGS
immediate::PxSolveConstraintsTGS(headers.begin(), headers.size(), orderedDescs.begin(), bodies.begin(), txInertia.begin(), nbDynamics, nbPositionIterations, nbVelocityIterations, stepDt, invStepDt);
immediate::PxIntegrateSolverBodiesTGS(bodies.begin(), txInertia.begin(), globalPoses.begin(), nbDynamics, dt);
for (PxU32 a = 0; a < nbDynamics; ++a)
{
PxRigidDynamic* dynamic = actors[a]->is<PxRigidDynamic>();
const PxTGSSolverBodyVel& body = bodies[a];
dynamic->setLinearVelocity(body.linearVelocity);
dynamic->setAngularVelocity(body.angularVelocity);
dynamic->setGlobalPose(globalPoses[a]);
}
#else
//Solve all the constraints produced earlier. Intermediate motion linear/angular velocity buffers are filled in. These contain intermediate delta velocity information that is used
//the PxIntegrateSolverBody
PxArray<PxVec3> motionLinearVelocity(nbDynamics);
PxArray<PxVec3> motionAngularVelocity(nbDynamics);
//Zero the bodies array. This buffer contains the delta velocities and are accumulated during the simulation. For correct behavior, it is vital
//that this buffer is zeroed.
PxMemZero(bodies.begin(), bodies.size() * sizeof(PxSolverBody));
immediate::PxSolveConstraints(headers.begin(), headers.size(), orderedDescs.begin(), bodies.begin(), motionLinearVelocity.begin(), motionAngularVelocity.begin(), nbDynamics, nbPositionIterations, nbVelocityIterations);
immediate::PxIntegrateSolverBodies(bodyData.begin(), bodies.begin(), motionLinearVelocity.begin(), motionAngularVelocity.begin(), nbDynamics, dt);
for (PxU32 a = 0; a < nbDynamics; ++a)
{
PxRigidDynamic* dynamic = actors[a]->is<PxRigidDynamic>();
const PxSolverBodyData& data = bodyData[a];
dynamic->setLinearVelocity(data.linearVelocity);
dynamic->setAngularVelocity(data.angularVelocity);
dynamic->setGlobalPose(data.body2World);
}
#endif
#if PROFILE_STEP
time = __rdtsc() - time;
printf("Time: %d\n", PxU32(time/1024));
#endif
}
void cleanupPhysics(bool /*interactive*/)
{
PX_RELEASE(gScene);
PX_RELEASE(gDispatcher);
PX_RELEASE(gPhysics);
if(gPvd)
{
PxPvdTransport* transport = gPvd->getTransport();
PX_RELEASE(gPvd);
PX_RELEASE(transport);
}
delete gCacheAllocator;
delete gConstraintAllocator;
#if WITH_PERSISTENCY
#if USE_IMMEDIATE_BROADPHASE
releaseBroadPhase();
#else
delete allContactCache;
#endif
#endif
PX_RELEASE(gFoundation);
printf("SnippetImmediateMode done.\n");
}
void keyPress(unsigned char key, const PxTransform& camera)
{
switch(toupper(key))
{
case ' ': createDynamic(camera, PxSphereGeometry(3.0f*gUnitScale), camera.rotate(PxVec3(0, 0, -1)) * 200*gUnitScale); updateContactPairs(); break;
}
}
int snippetMain(int, const char*const*)
{
#ifdef RENDER_SNIPPET
extern void renderLoop();
renderLoop();
#else
static const PxU32 frameCount = 100;
initPhysics(false);
for(PxU32 i=0; i<frameCount; i++)
stepPhysics(false);
cleanupPhysics(false);
#endif
return 0;
}
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