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OpenMW/apps/openmw/mwphysics/mtphysics.hpp

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Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
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#ifndef OPENMW_MWPHYSICS_MTPHYSICS_H
#define OPENMW_MWPHYSICS_MTPHYSICS_H
#include <atomic>
#include <condition_variable>
Use some C++17 where it makes the code more readable Also replace boost::optional
2020-10-21 09:08:59 +00:00
#include <optional>
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
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#include <shared_mutex>
Sort headers
2020-10-21 09:08:40 +00:00
#include <thread>
Store the btCollisionObject* of the object we're standing on instead of MWWorld::Ptr: - they are equivalent - btCollisionObject* is readily available from the simulation, it saves a call to a mutex - btCollisionObject* is smaller
2021-07-23 20:37:55 +00:00
#include <unordered_set>
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
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#include <BulletCollision/CollisionDispatch/btCollisionWorld.h>
Add the async physics worker to the profiler overlay.
2020-11-20 12:11:53 +00:00
#include <osg/Timer>
Prevent physics death spiral by falling back to true delta time when needed
2021-03-21 20:45:46 +00:00
#include "components/misc/budgetmeasurement.hpp"
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
#include "physicssystem.hpp"
#include "ptrholder.hpp"
namespace Misc
{
class Barrier;
}
Guard the Bullet drawing method with a read lock on the btCollisionWorld. It closes a race on the collision shapes coordinates.
2021-03-26 22:45:56 +00:00
namespace MWRender
{
class DebugDrawer;
}
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
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namespace MWPhysics
{
Use shared locks in physics system when using multithreaded bullet
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enum class LockingPolicy
{
NoLocks,
ExclusiveLocksOnly,
AllowSharedLocks,
};
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
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class PhysicsTaskScheduler
{
public:
Guard the Bullet drawing method with a read lock on the btCollisionWorld. It closes a race on the collision shapes coordinates.
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PhysicsTaskScheduler(float physicsDt, btCollisionWorld* collisionWorld, MWRender::DebugDrawer* debugDrawer);
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
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~PhysicsTaskScheduler();
Apply clang-format to code base
2022-09-22 18:26:05 +00:00
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
/// @brief move actors taking into account desired movements and collisions
/// @param numSteps how much simulation step to run
/// @param timeAccum accumulated time from previous run to interpolate movements
/// @param actorsData per actor data needed to compute new positions
/// @return new position of each actor
more clang format
2023-12-03 15:27:21 +00:00
void applyQueuedMovements(float& timeAccum, float simulationTime, std::vector<Simulation>& simulations,
osg::Timer_t frameStart, unsigned int frameNumber, osg::Stats& stats);
Apply clang-format to code base
2022-09-22 18:26:05 +00:00
Refactor a bit the physics simulation to make it not actor centric: - inline PhysicsSystem::applyQueuedMovements() into PhysicsSystem::stepSimulation() - rename PhysicsTaskScheduler::moveActors() to PhysicsTaskScheduler::applyQueuedMovements() - move the actor movement code from World::doPhysics() to PhysicsSystem::moveActors() (analogically to the projectile manager)
2021-07-31 21:26:10 +00:00
void resetSimulation(const ActorMap& actors);
Apply clang-format to code base
2022-09-22 18:26:05 +00:00
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
// Thread safe wrappers
void rayTest(const btVector3& rayFromWorld, const btVector3& rayToWorld,
btCollisionWorld::RayResultCallback& resultCallback) const;
void convexSweepTest(const btConvexShape* castShape, const btTransform& from, const btTransform& to,
btCollisionWorld::ConvexResultCallback& resultCallback) const;
void contactTest(btCollisionObject* colObj, btCollisionWorld::ContactResultCallback& resultCallback);
Use some C++17 where it makes the code more readable Also replace boost::optional
2020-10-21 09:08:59 +00:00
std::optional<btVector3> getHitPoint(const btTransform& from, btCollisionObject* target);
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
void aabbTest(const btVector3& aabbMin, const btVector3& aabbMax, btBroadphaseAabbCallback& callback);
void getAabb(const btCollisionObject* obj, btVector3& min, btVector3& max);
void setCollisionFilterMask(btCollisionObject* collisionObject, int collisionFilterMask);
void addCollisionObject(btCollisionObject* collisionObject, int collisionFilterGroup, int collisionFilterMask);
void removeCollisionObject(btCollisionObject* collisionObject);
Store std::weak_ptr into mUpdateAabb. This avoid extending the lifetime of collision objects beyond what they should.
2022-01-22 16:17:20 +00:00
void updateSingleAabb(const std::shared_ptr<PtrHolder>& ptr, bool immediate = false);
Use shared_ptr instead of weak_ptr for actors handle inside the simulation The purpose of weak_ptr is to avoid performing the simulation on deleted Actor by promoting it to a shared_ptr via a lock() call. This clutter the code with a lot of branches, whereas the overwhelmingly common case is for the call to succeed. Since the simulation is decoupled from the engine state, we can use a shared_ptr instead of a weak_ptr. This allow us to ignore (ie not handle) the rarer case where the actor is delete from the scene. This means that the simulation will run for one frame more than before for each actor, whereas the rest of the engine will be ignorant of this.
2021-08-14 21:15:11 +00:00
bool getLineOfSight(const std::shared_ptr<Actor>& actor1, const std::shared_ptr<Actor>& actor2);
Guard the Bullet drawing method with a read lock on the btCollisionWorld. It closes a race on the collision shapes coordinates.
2021-03-26 22:45:56 +00:00
void debugDraw();
Store the btCollisionObject* of the object we're standing on instead of MWWorld::Ptr: - they are equivalent - btCollisionObject* is readily available from the simulation, it saves a call to a mutex - btCollisionObject* is smaller
2021-07-23 20:37:55 +00:00
void* getUserPointer(const btCollisionObject* object) const;
Use shared_ptr instead of weak_ptr for actors handle inside the simulation The purpose of weak_ptr is to avoid performing the simulation on deleted Actor by promoting it to a shared_ptr via a lock() call. This clutter the code with a lot of branches, whereas the overwhelmingly common case is for the call to succeed. Since the simulation is decoupled from the engine state, we can use a shared_ptr instead of a weak_ptr. This allow us to ignore (ie not handle) the rarer case where the actor is delete from the scene. This means that the simulation will run for one frame more than before for each actor, whereas the rest of the engine will be ignorant of this.
2021-08-14 21:15:11 +00:00
void releaseSharedStates(); // destroy all objects whose destructor can't be safely called from
// ~PhysicsTaskScheduler()
Apply clang-format to code base
2022-09-22 18:26:05 +00:00
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
private:
Do not use std::shared_mutex to wait for job for async physics std::shared_mutex in combination with std::condition_variable_any may lead to a situation when notify_all does not wake up all waiting threads on Windows. Use separate std::mutex and std::condition_variable to notify about new job. Encapsulate all workers synchronization logic into a separate type.
2023-03-05 15:11:10 +00:00
class WorkersSync;
Use common function for sync and async case. Now both cases follow the same flow, synchronous simulation is just a special case.
2021-09-29 08:17:31 +00:00
void doSimulation();
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
void worker();
void updateActorsPositions();
bool hasLineOfSight(const Actor* actor1, const Actor* actor2);
void refreshLOSCache();
void updateAabbs();
Use shared_ptr instead of weak_ptr for actors handle inside the simulation The purpose of weak_ptr is to avoid performing the simulation on deleted Actor by promoting it to a shared_ptr via a lock() call. This clutter the code with a lot of branches, whereas the overwhelmingly common case is for the call to succeed. Since the simulation is decoupled from the engine state, we can use a shared_ptr instead of a weak_ptr. This allow us to ignore (ie not handle) the rarer case where the actor is delete from the scene. This means that the simulation will run for one frame more than before for each actor, whereas the rest of the engine will be ignorant of this.
2021-08-14 21:15:11 +00:00
void updatePtrAabb(const std::shared_ptr<PtrHolder>& ptr);
Move stats update into their own function.
2020-12-18 20:18:04 +00:00
void updateStats(osg::Timer_t frameStart, unsigned int frameNumber, osg::Stats& stats);
Prevent physics death spiral by falling back to true delta time when needed
2021-03-21 20:45:46 +00:00
std::tuple<int, float> calculateStepConfig(float timeAccum) const;
Do not store callback inside Misc::Barrier The only wait method can be provided with it so pass it as a template parameter there.
2021-05-05 21:25:13 +00:00
void afterPreStep();
void afterPostStep();
void afterPostSim();
Use common function for sync and async case. Now both cases follow the same flow, synchronous simulation is just a special case.
2021-09-29 08:17:31 +00:00
void syncWithMainThread();
Fix deadlock in physics system 1. Reorder unlock and notify_all calls to avoid notifying when not all worker threads are waiting. 2. Make sure main thread does not attempt to exclusively lock mSimulationMutex while not all workers are done with previous frame. 3. Replace mNewFrame flag by counter to avoid modification from multiple threads.
2021-11-24 18:10:02 +00:00
void waitForWorkers();
more clang format
2023-12-03 15:27:21 +00:00
void prepareWork(float& timeAccum, float simulationTime, std::vector<Simulation>& simulations,
osg::Timer_t frameStart, unsigned int frameNumber, osg::Stats& stats);
Apply clang-format to code base
2022-09-22 18:26:05 +00:00
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
std::unique_ptr<WorldFrameData> mWorldFrameData;
Reuse physics simulations buffer To avoid redundant allocations. Use 2 buffers to make sure there is no overlap between main and the background threads.
2022-09-06 23:55:51 +00:00
std::vector<Simulation>* mSimulations = nullptr;
Store the btCollisionObject* of the object we're standing on instead of MWWorld::Ptr: - they are equivalent - btCollisionObject* is readily available from the simulation, it saves a call to a mutex - btCollisionObject* is smaller
2021-07-23 20:37:55 +00:00
std::unordered_set<const btCollisionObject*> mCollisionObjects;
Prevent physics death spiral by falling back to true delta time when needed
2021-03-21 20:45:46 +00:00
float mDefaultPhysicsDt;
float mPhysicsDt;
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
float mTimeAccum;
Replace pointless usage of shared_ptr by unique_ptr / non-owning raw pointer for btCollisionWorld.
2021-03-26 22:43:49 +00:00
btCollisionWorld* mCollisionWorld;
Guard the Bullet drawing method with a read lock on the btCollisionWorld. It closes a race on the collision shapes coordinates.
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MWRender::DebugDrawer* mDebugDrawer;
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
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std::vector<LOSRequest> mLOSCache;
Store std::weak_ptr into mUpdateAabb. This avoid extending the lifetime of collision objects beyond what they should.
2022-01-22 16:17:20 +00:00
std::set<std::weak_ptr<PtrHolder>, std::owner_less<std::weak_ptr<PtrHolder>>> mUpdateAabb;
Apply clang-format to code base
2022-09-22 18:26:05 +00:00
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
// TODO: use std::experimental::flex_barrier or std::barrier once it becomes a thing
std::unique_ptr<Misc::Barrier> mPreStepBarrier;
std::unique_ptr<Misc::Barrier> mPostStepBarrier;
std::unique_ptr<Misc::Barrier> mPostSimBarrier;
Apply clang-format to code base
2022-09-22 18:26:05 +00:00
Use shared locks in physics system when using multithreaded bullet
2023-02-12 13:51:46 +00:00
LockingPolicy mLockingPolicy;
Use unsigned to define number of threads
2022-07-12 12:58:25 +00:00
unsigned mNumThreads;
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
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int mNumJobs;
int mRemainingSteps;
int mLOSCacheExpiry;
bool mAdvanceSimulation;
std::atomic<int> mNextJob;
std::atomic<int> mNextLOS;
std::vector<std::thread> mThreads;
Apply clang-format to code base
2022-09-22 18:26:05 +00:00
Use some C++17 where it makes the code more readable Also replace boost::optional
2020-10-21 09:08:59 +00:00
mutable std::shared_mutex mSimulationMutex;
mutable std::shared_mutex mCollisionWorldMutex;
mutable std::shared_mutex mLOSCacheMutex;
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
mutable std::mutex mUpdateAabbMutex;
Apply clang-format to code base
2022-09-22 18:26:05 +00:00
Add the async physics worker to the profiler overlay.
2020-11-20 12:11:53 +00:00
unsigned int mFrameNumber;
const osg::Timer* mTimer;
Apply clang-format to code base
2022-09-22 18:26:05 +00:00
Prevent physics death spiral by falling back to true delta time when needed
2021-03-21 20:45:46 +00:00
int mPrevStepCount;
Misc::BudgetMeasurement mBudget;
Misc::BudgetMeasurement mAsyncBudget;
unsigned int mBudgetCursor;
osg::Timer_t mAsyncStartTime;
Add the async physics worker to the profiler overlay.
2020-11-20 12:11:53 +00:00
osg::Timer_t mTimeBegin;
osg::Timer_t mTimeEnd;
osg::Timer_t mFrameStart;
Do not use std::shared_mutex to wait for job for async physics std::shared_mutex in combination with std::condition_variable_any may lead to a situation when notify_all does not wake up all waiting threads on Windows. Use separate std::mutex and std::condition_variable to notify about new job. Encapsulate all workers synchronization logic into a separate type.
2023-03-05 15:11:10 +00:00
std::unique_ptr<WorkersSync> mWorkersSync;
Process movement queue in one or several background threads Before movement calculation, the main thread prepare a vector of ActorFrameData, which contains all data necessary to perform the simulation, and feed it to the solver. At the same time it fetches the result from the previous background simulation, which in turn is used by the game mechanics. Other functions of the physics system (weapon hit for instance) interrupt the background simulation, with some exceptions described below. The number of threads is controlled by the numeric setting [Physics] async num threads In case 'async num threads' > 1 and Bullet doesn't support multiple threads, 1 async thread will be used. 0 means synchronous solver. Additional settings (will be silently switched off if async num threads = 0) [Physics] defer aabb update Update AABBs of actors and objects in the background thread(s). It is not an especially costly operation, but it needs exclusive access to the collision world, which blocks other operations. Since AABB needs to be updated for collision detection, one can queue them to defer update before start of the movement solver. Extensive tests on as much as one installation (mine) show no drawback having that switched on. [Physics] lineofsight keep inactive cache Control for how long (how many frames) the line of sight (LOS) request will be kept updated. When a request for LOS is made for the first time, the background threads are stopped to service it. From now on, the LOS will be refreshed preemptively as part of the background routine until it is not required for lineofsight keep inactive cache frames. This mean that subsequent request will not interrupt the background computation.
2020-10-15 04:11:44 +00:00
};
}
#endif
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