godot/servers/physics_2d/godot_body_pair_2d.cpp

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/*  godot_body_pair_2d.cpp                                                */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "godot_body_pair_2d.h"

#include "godot_collision_solver_2d.h"
#include "godot_space_2d.h"

#define ACCUMULATE_IMPULSES

#define MIN_VELOCITY …
#define MAX_BIAS_ROTATION …

void GodotBodyPair2D::_add_contact(const Vector2 &p_point_A, const Vector2 &p_point_B, void *p_self) { … }

void GodotBodyPair2D::_contact_added_callback(const Vector2 &p_point_A, const Vector2 &p_point_B) { … }

void GodotBodyPair2D::_validate_contacts() { … }

// _test_ccd prevents tunneling by slowing down a high velocity body that is about to collide so that next frame it will be at an appropriate location to collide (i.e. slight overlap)
// Warning: the way velocity is adjusted down to cause a collision means the momentum will be weaker than it should for a bounce!
// Process: only proceed if body A's motion is high relative to its size.
// cast forward along motion vector to see if A is going to enter/pass B's collider next frame, only proceed if it does.
// adjust the velocity of A down so that it will just slightly intersect the collider instead of blowing right past it.
bool GodotBodyPair2D::_test_ccd(real_t p_step, GodotBody2D *p_A, int p_shape_A, const Transform2D &p_xform_A, GodotBody2D *p_B, int p_shape_B, const Transform2D &p_xform_B) { … }

real_t combine_bounce(GodotBody2D *A, GodotBody2D *B) { … }

real_t combine_friction(GodotBody2D *A, GodotBody2D *B) { … }

bool GodotBodyPair2D::setup(real_t p_step) { … }

bool GodotBodyPair2D::pre_solve(real_t p_step) { … }

void GodotBodyPair2D::solve(real_t p_step) { … }

GodotBodyPair2D::GodotBodyPair2D(GodotBody2D *p_A, int p_shape_A, GodotBody2D *p_B, int p_shape_B) : … { … }

GodotBodyPair2D::~GodotBodyPair2D() { … }