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#include "UnityPrefix.h"
#if ENABLE_2D_PHYSICS
#include "Runtime/Physics2D/EdgeCollider2D.h"
#include "Runtime/Physics2D/RigidBody2D.h"
#include "Runtime/Physics2D/Physics2DManager.h"
#include "Runtime/Graphics/Transform.h"
#include "Runtime/Graphics/SpriteFrame.h"
#include "Runtime/Serialize/TransferFunctions/SerializeTransfer.h"
#include "Runtime/Profiler/Profiler.h"
#include "Runtime/Filters/AABBUtility.h"
#include "Runtime/Filters/Mesh/SpriteRenderer.h"
#include "External/Box2D/Box2D/Box2D.h"
#include "External/libtess2/libtess2/tesselator.h"
PROFILER_INFORMATION(gPhysics2DProfileEdgeColliderCreate, "Physics2D.EdgeColliderCreate", kProfilerPhysics)
IMPLEMENT_CLASS (EdgeCollider2D)
IMPLEMENT_OBJECT_SERIALIZE (EdgeCollider2D)
#define EDGE_COLLIDER_2D_MIN_DISTANCE (b2_linearSlop * b2_linearSlop * 2.01f)
// --------------------------------------------------------------------------
EdgeCollider2D::EdgeCollider2D (MemLabelId label, ObjectCreationMode mode)
: Super(label, mode)
{
}
EdgeCollider2D::~EdgeCollider2D ()
{
}
template<class TransferFunction>
void EdgeCollider2D::Transfer (TransferFunction& transfer)
{
Super::Transfer (transfer);
TRANSFER (m_Points);
}
void EdgeCollider2D::Reset ()
{
Super::Reset ();
m_Points.clear ();
m_Points.push_back (Vector2f (-0.5f, 0.0f));
m_Points.push_back (Vector2f (0.5f, 0.0f));
}
void EdgeCollider2D::SmartReset ()
{
Super::SmartReset ();
AABB aabb;
if (GetGameObjectPtr () && CalculateLocalAABB (GetGameObject (), &aabb))
{
if (aabb.GetExtent ().x < EDGE_COLLIDER_2D_MIN_DISTANCE)
{
m_Points.clear ();
m_Points.push_back (Vector2f (-0.5f, 0.0f));
m_Points.push_back (Vector2f (0.5f, 0.0f));
return;
}
const Vector3f min = aabb.GetMin();
const Vector3f max = aabb.GetMax();
const float y = (min.y + max.y) * 0.5f;
Vector2f points[2] = { Vector2f(min.x, y), Vector2f(max.x, y) };
SetPoints (points, 2);
}
}
bool EdgeCollider2D::SetPoints (const Vector2f* points, size_t count)
{
// Fail if point count is invalid.
if (count < 2)
return false;
m_Points.clear ();
while (count-- > 0)
{
m_Points.push_back (*points++);
}
// Create the points.
Create();
return true;
}
// --------------------------------------------------------------------------
void EdgeCollider2D::Create (const Rigidbody2D* ignoreRigidbody)
{
PROFILER_AUTO(gPhysics2DProfileEdgeColliderCreate, NULL);
// Ensure we're cleaned-up.
Cleanup ();
// Ignore if not active.
if (!IsActive() || m_Points.size () < 2)
return;
// Calculate collider transformation.
Matrix4x4f relativeTransform;
b2Body* body;
CalculateColliderTransformation (ignoreRigidbody, &body, relativeTransform);
// Fetch the collider scale.
const Vector3f scale = GetComponent(Transform).GetWorldScaleLossy();
// Transform the chain.
b2Vec2* transformedPoints;
ALLOC_TEMP(transformedPoints, b2Vec2, m_Points.size () + 1); // We add an extra one in-case we need to extend.
const int validPointCount = TransformPoints (relativeTransform, scale, transformedPoints);
// Invalid chain if a single edge doesn't exit.
if (validPointCount < 2)
return;
// Check vertex distances.
for (int i = 1; i < validPointCount; ++i)
if (b2DistanceSquared (transformedPoints[i-1], transformedPoints[i]) < EDGE_COLLIDER_2D_MIN_DISTANCE)
return;
// Generate the chain shape.
b2ChainShape chainShape;
chainShape.CreateChain (transformedPoints, validPointCount);
// Create the chain fixture.
dynamic_array<b2Shape*> chainShapes(kMemTempAlloc);
chainShapes.push_back (&chainShape);
b2FixtureDef def;
FinalizeCreate(def, body, &chainShapes);
}
// --------------------------------------------------------------------------
int EdgeCollider2D::TransformPoints(const Matrix4x4f& relativeTransform, const Vector3f& scale, b2Vec2* outPoints)
{
const size_t inPointCount = m_Points.size ();
const Vector2f* edgePoint = m_Points.data ();
int outCount = 0;
for (size_t i = 0; i <inPointCount; ++i, ++edgePoint)
{
// Calculate transform points.
const Vector3f vertex3D = relativeTransform.MultiplyPoint3 (Vector3f(edgePoint->x * scale.x, edgePoint->y * scale.y, 0.0f));
const b2Vec2 vertex2D(vertex3D.x, vertex3D.y);
// Skip point if they end up being too close. Box2d fires asserts if distance between neighbors is less than b2_linearSlop.
if (outCount > 0 && b2DistanceSquared(*(outPoints-1), vertex2D) <= EDGE_COLLIDER_2D_MIN_DISTANCE)
continue;
*outPoints++ = vertex2D;
++outCount;
}
return outCount;
}
#endif // #if ENABLE_2D_PHYSICS
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