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Fixed precision loss in physics accumulator

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This commit is contained in:
sippeangelo
2015-09-28 22:55:39 +02:00
parent 5e0b0f920a
commit 5e7e5ec8bb
3 changed files with 4 additions and 153 deletions
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include/Physics/PhysicsSystem.h
+2 -2
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@@ -57,8 +57,8 @@ public:
private:
b2Vec2 m_Gravity;
b2World* m_PhysicsWorld;
float m_TimeStep;
float m_Accumulator;
double m_TimeStep;
double m_Accumulator;
int m_VelocityIterations, m_PositionIterations;
include/Physics/PhysicsSystem.h.orig
-149
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@@ -1,149 +0,0 @@
#ifndef DAYDREAM_PHYSICSSYSTEM_H
#define DAYDREAM_PHYSICSSYSTEM_H
#include <unordered_map>
#include "Core/System.h"
#include "Core/World.h"
#include "CRectangleShape.h"
#include "Physics/CPhysics.h"
#include <Box2D/Box2D.h>
#include "Core/CTransform.h"
#include "Transform/TransformSystem.h"
#include "Physics/EContact.h"
#include "Physics/ESetImpulse.h"
#include "Physics/CCircleShape.h"
#include "Core/EventBroker.h"
#include "Game/CPad.h"
<<<<<<< HEAD
#include "Game/CBall.h"
=======
#include "Physics/CWaterVolume.h"
#include "Rendering/CSprite.h"
>>>>>>> origin/master
namespace dd
{
namespace Systems
{
class PhysicsSystem : public System
{
friend class ContractListener;
public:
PhysicsSystem(World* world, std::shared_ptr<dd::EventBroker> eventBroker)
: System(world, eventBroker) {}
~PhysicsSystem();
EventRelay<PhysicsSystem, Events::SetImpulse> m_SetImpulse;
bool SetImpulse(const Events::SetImpulse &event);
void RegisterComponents(ComponentFactory* cf) override;
void Initialize() override;
// Called once per system every tick
void Update(double dt) override;
// Called once for every entity in the world every tick
void UpdateEntity(double dt, EntityID entity, EntityID parent) override;
// Called when components are committed to an entity
void OnEntityCommit(EntityID entity) override;
// Called when an entity is removed
void OnEntityRemoved(EntityID entity) override;
private:
b2Vec2 m_Gravity;
b2World* m_PhysicsWorld;
float m_TimeStep;
float m_Accumulator;
int m_VelocityIterations, m_PositionIterations;
std::unordered_map<EntityID, b2Body*> m_EntitiesToBodies;
std::unordered_map<b2Body*, EntityID> m_BodiesToEntities;
void CreateBody(EntityID entity);
b2ParticleSystem *m_ParticleSystem;
b2ParticleGroup* t_watergroup;
std::unordered_map<EntityID, const b2ParticleHandle*> m_EntitiesToParticleHandle;
std::unordered_map<const b2ParticleHandle*, EntityID> m_ParticleHandleToEntities;
void InitializeWater();
void SyncWater(); //TODO: Probably remove this
void CreateParticleGroup(EntityID entity);
struct Impulse
{
b2Body* Body;
b2Vec2 Impulse;
b2Vec2 Point;
};
std::list<Impulse> m_Impulses;
class ContactListener : public b2ContactListener
{
public:
ContactListener(PhysicsSystem* physicsSystem)
: m_PhysicsSystem(physicsSystem) { }
void BeginContact(b2Contact* contact)
{
b2WorldManifold worldManifold;
contact->GetWorldManifold(&worldManifold);
Events::Contact e;
e.Entity1 = m_PhysicsSystem->m_BodiesToEntities[contact->GetFixtureA()->GetBody()];
e.Entity2 = m_PhysicsSystem->m_BodiesToEntities[contact->GetFixtureB()->GetBody()];
e.Normal = glm::normalize(glm::vec2(contact->GetManifold()->localNormal.x, contact->GetManifold()->localNormal.y));
e.SignificantNormal = glm::normalize((glm::abs(e.Normal.x) > glm::abs(e.Normal.y)) ? glm::vec2(e.Normal.x, 0) : glm::vec2(0, e.Normal.y));
m_PhysicsSystem->EventBroker->Publish(e);
}
void EndContact(b2Contact* contact)
{
}
void PreSolve(b2Contact* contact, const b2Manifold* oldManifold)
{
EntityID entityA = m_PhysicsSystem->m_BodiesToEntities[contact->GetFixtureA()->GetBody()];
EntityID entityB = m_PhysicsSystem->m_BodiesToEntities[contact->GetFixtureB()->GetBody()];
auto physicsComponentA = m_PhysicsSystem->m_World->GetComponent<Components::Physics>(entityA);
auto physicsComponentB = m_PhysicsSystem->m_World->GetComponent<Components::Physics>(entityB);
if (physicsComponentA != nullptr && physicsComponentB != nullptr) {
if (physicsComponentA->Calculate || physicsComponentB->Calculate) {
// Turn of collisions
contact->SetEnabled(false);
}
}
}
void PostSolve(b2Contact* contact, const b2ContactImpulse* impulse)
{
}
private:
PhysicsSystem* m_PhysicsSystem;
};
ContactListener* m_ContactListener;
};
}
}
#endif //DAYDREAM_PHYSICSSYSTEM_H
src/game/Physics/PhysicsSystem.cpp
+2 -2
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@@ -15,10 +15,10 @@ void dd::Systems::PhysicsSystem::Initialize()
m_Gravity = b2Vec2(0.f, -9.82f);
m_PhysicsWorld = new b2World(m_Gravity);
m_TimeStep = 1.f/60.f;
m_TimeStep = 1.0/60.0;
m_VelocityIterations = 6;
m_PositionIterations = 2;
m_Accumulator = 0.f;
m_Accumulator = 0.0;
m_PhysicsWorld->SetContactListener(m_ContactListener);