RCBASIC4/rcbasic_runtime/rc_sprite_physics.h

#include "rc_sprite2D.h"

void rc_getSpriteCenter(int spr_id, double* x, double* y)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	*x = (double)rc_sprite[spr_id].physics.body->GetLocalCenter().x;
	*y = (double)rc_sprite[spr_id].physics.body->GetLocalCenter().y;
}

void rc_getSpriteWorldCenter(int spr_id, double* x, double* y)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	*x = (double)rc_sprite[spr_id].physics.body->GetWorldCenter().x;
	*y = (double)rc_sprite[spr_id].physics.body->GetWorldCenter().y;
}

void rc_setSpriteLinearVelocity(int spr_id, double x, double y)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

    rc_sprite[spr_id].physics.body->SetLinearVelocity(b2Vec2(x, y));
}

void rc_getSpriteLinearVelocity(int spr_id, double* x, double* y)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

    *x  = (double)rc_sprite[spr_id].physics.body->GetLinearVelocity().x;
    *y  = (double)rc_sprite[spr_id].physics.body->GetLinearVelocity().y;
}

void rc_setSpriteAngularVelocity(int spr_id, double av)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	av = rc_util_radians(av);

    rc_sprite[spr_id].physics.body->SetAngularVelocity(av);
}

double rc_getSpriteAngularVelocity(int spr_id)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return 0;

	if(!rc_sprite[spr_id].active)
		return 0;

    return (double)rc_util_degrees(rc_sprite[spr_id].physics.body->GetAngularVelocity());
}

void rc_applySpriteForce(int spr_id, double fX, double fY, double pX, double pY)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

    rc_sprite[spr_id].physics.body->ApplyForce(b2Vec2(fX, fY), b2Vec2(pX, pY), true);
}

void rc_applySpriteCentralForce(int spr_id, double x, double y)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

    rc_sprite[spr_id].physics.body->ApplyForceToCenter(b2Vec2(x, y), true);
}

void rc_applySpriteTorque(int spr_id, double torque)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

    rc_sprite[spr_id].physics.body->ApplyTorque(torque, true);
}

void rc_applySpriteLinearImpulse(int spr_id, double iX, double iY, double pX, double pY)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

    rc_sprite[spr_id].physics.body->ApplyLinearImpulse(b2Vec2(iX, iY), b2Vec2(pX, pY), true);
}

void rc_applySpriteAngularImpulse(int spr_id, double impulse)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

    rc_sprite[spr_id].physics.body->ApplyAngularImpulse(impulse, true);
}

double rc_getSpriteMass(int spr_id)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return 0;

	if(!rc_sprite[spr_id].active)
		return 0;

    return rc_sprite[spr_id].physics.body->GetMass();
}

double rc_getSpriteInertia(int spr_id)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return 0;

	if(!rc_sprite[spr_id].active)
		return 0;

    return rc_sprite[spr_id].physics.body->GetInertia();
}

void rc_getSpriteWorldPoint(int spr_id, double lX, double lY, double* x, double* y)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	b2Vec2 wp = rc_sprite[spr_id].physics.body->GetWorldPoint(b2Vec2(lX, lY));
	*x = wp.x;
	*y = wp.y;
}

void rc_getSpriteWorldVector(int spr_id, double lX, double lY, double* x, double* y)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	b2Vec2 wv = rc_sprite[spr_id].physics.body->GetWorldVector(b2Vec2(lX, lY));
	*x = wv.x;
	*y = wv.y;
}

void rc_getSpriteLocalPoint(int spr_id, double wX, double wY, double* x, double* y)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	b2Vec2 lp = rc_sprite[spr_id].physics.body->GetLocalPoint(b2Vec2(wX, wY));
	*x = lp.x;
	*y = lp.y;
}

void rc_getSpriteLocalVector(int spr_id, double wX, double wY, double* x, double* y)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	b2Vec2 lv = rc_sprite[spr_id].physics.body->GetLocalVector(b2Vec2(wX, wY));
	*x = lv.x;
	*y = lv.y;
}

void rc_getSpriteLinearVelocityFromLocalPoint(int spr_id, double pX, double pY, double* x, double* y)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

    b2Vec2 pos = rc_sprite[spr_id].physics.body->GetLinearVelocityFromLocalPoint(b2Vec2(pX, pY));
    *x = pos.x;
    *y = pos.y;
}

void rc_getSpriteLinearVelocityFromWorldPoint(int spr_id, double wX, double wY, double* x, double* y)
{
    if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

    b2Vec2 pos = rc_sprite[spr_id].physics.body->GetLinearVelocityFromWorldPoint(b2Vec2(wX, wY));
    *x = pos.x;
    *y = pos.y;
}

double rc_getSpriteLinearDamping(int spr_id)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return 0;

	if(!rc_sprite[spr_id].active)
		return 0;

	return rc_sprite[spr_id].physics.body->GetLinearDamping();
}

void rc_setSpriteLinearDamping(int spr_id, double linearDamping)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.body->SetLinearDamping(linearDamping);
}

double rc_getSpriteAngularDamping(int spr_id)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return 0;

	if(!rc_sprite[spr_id].active)
		return 0;

	return rc_sprite[spr_id].physics.body->GetAngularDamping();
}

void rc_setSpriteAngularDamping(int spr_id, double angularDamping)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.body->SetAngularDamping(angularDamping);
}

double rc_getSpriteGravityScale(int spr_id)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return 0;

	if(!rc_sprite[spr_id].active)
		return 0;

	return rc_sprite[spr_id].physics.body->GetGravityScale();
}

void rc_setSpriteGravityScale(int spr_id, double g_scale)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.body->SetGravityScale(g_scale);
}

void rc_setSpriteBullet(int spr_id, bool flag)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.body->SetBullet(flag);
}

bool rc_spriteIsBullet(int spr_id)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return false;

	if(!rc_sprite[spr_id].active)
		return false;

	return rc_sprite[spr_id].physics.body->IsBullet();
}

void rc_setSpriteSleepAllowed(int spr_id, bool flag)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.body->SetSleepingAllowed(flag);
}

bool rc_spriteSleepAllowed(int spr_id)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return false;

	if(!rc_sprite[spr_id].active)
		return false;

	return rc_sprite[spr_id].physics.body->IsSleepingAllowed();
}

void rc_setSpriteAwake(int spr_id, bool flag)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.body->SetAwake(flag);
}

bool rc_spriteIsAwake(int spr_id)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return false;

	if(!rc_sprite[spr_id].active)
		return false;

	return rc_sprite[spr_id].physics.body->IsAwake();
}

void rc_setSpriteFixedRotation(int spr_id, bool flag)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.body->SetFixedRotation(flag);
}

bool rc_spriteIsFixedRotation(int spr_id)
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return false;

	if(!rc_sprite[spr_id].active)
		return false;

	return rc_sprite[spr_id].physics.body->IsFixedRotation();
}



void rc_setSpriteDensity( int spr_id, double density )
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.fixture->SetDensity(density);
}

double rc_getSpriteDensity( int spr_id )
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return 0;

	if(!rc_sprite[spr_id].active)
		return 0;

	return rc_sprite[spr_id].physics.fixture->GetDensity();
}

void rc_setSpriteFriction( int spr_id, double friction )
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.fixture->SetFriction(friction);
}

double rc_getSpriteFriction( int spr_id )
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return 0;

	if(!rc_sprite[spr_id].active)
		return 0;

	return rc_sprite[spr_id].physics.fixture->GetFriction();
}

void rc_setSpriteRestitution( int spr_id, double restitution )
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.fixture->SetRestitution(restitution);
}

double rc_getSpriteRestitution( int spr_id )
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return 0;

	if(!rc_sprite[spr_id].active)
		return 0;

	return rc_sprite[spr_id].physics.fixture->GetRestitution();
}

void rc_setSpriteRestitutionThreshold( int spr_id, double threshold )
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	rc_sprite[spr_id].physics.fixture->SetRestitutionThreshold(threshold);
}

double rc_getSpriteRestitutionThreshold( int spr_id )
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return 0;

	if(!rc_sprite[spr_id].active)
		return 0;

	return rc_sprite[spr_id].physics.fixture->GetRestitutionThreshold();
}

void rc_getSpriteAABB( int spr_id, double* x1, double* y1, double* x2, double* y2 )
{
	if(spr_id < 0 || spr_id >= rc_sprite.size())
		return;

	if(!rc_sprite[spr_id].active)
		return;

	b2AABB bound_box = rc_sprite[spr_id].physics.fixture->GetAABB(0);
	*x1 = bound_box.upperBound.x;
	*y1 = bound_box.upperBound.y;
	*x2 = bound_box.lowerBound.x;
	*y2 = bound_box.lowerBound.y;
}

void rc_setWorld2DTimeStep( double ts )
{
	if(rc_active_canvas < 0 || rc_active_canvas >= rc_canvas.size())
        return;

    if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
        return;

	rc_canvas[rc_active_canvas].physics2D.timeStep = ts;
}

void rc_setWorld2DVelocityIterations( double v )
{
	if(rc_active_canvas < 0 || rc_active_canvas >= rc_canvas.size())
        return;

    if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
        return;

	rc_canvas[rc_active_canvas].physics2D.velocityIterations = (int)v;
}

void rc_setWorld2DPositionIterations( double p )
{
	if(rc_active_canvas < 0 || rc_active_canvas >= rc_canvas.size())
        return;

    if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
        return;

	rc_canvas[rc_active_canvas].physics2D.positionIterations = (int)p;
}

double rc_getWorld2DTimeStep()
{
	if(rc_active_canvas < 0 || rc_active_canvas >= rc_canvas.size())
        return 0;

    if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
        return 0;

	return rc_canvas[rc_active_canvas].physics2D.timeStep;
}

double rc_getWorld2DVelocityIterations()
{
	if(rc_active_canvas < 0 || rc_active_canvas >= rc_canvas.size())
        return 0;

    if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
        return 0;

	return rc_canvas[rc_active_canvas].physics2D.velocityIterations;
}

double rc_getWorld2DPositionIterations()
{
	if(rc_active_canvas < 0 || rc_active_canvas >= rc_canvas.size())
        return 0;

    if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
        return 0;

	return rc_canvas[rc_active_canvas].physics2D.positionIterations;
}

void rc_setWorld2DAutoClearForces( bool flag )
{
	if(rc_active_canvas < 0 || rc_active_canvas >= rc_canvas.size())
        return;

    if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
        return;

	rc_canvas[rc_active_canvas].physics2D.world->SetAutoClearForces(flag);
}

bool rc_getWorld2DAutoClearForces()
{
	if(rc_active_canvas < 0 || rc_active_canvas >= rc_canvas.size())
        return false;

    if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
        return false;

	return rc_canvas[rc_active_canvas].physics2D.world->GetAutoClearForces();
}


void rc_setGravity2D(double x, double y)
{
    if(rc_active_canvas < 0 || rc_active_canvas >= rc_canvas.size())
        return;

    if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
        return;

    b2Vec2 gravity(x, y);
    rc_canvas[rc_active_canvas].physics2D.world->SetGravity(gravity);

}

void rc_getGravity2D(double* x, double* y)
{
    if(rc_active_canvas < 0 || rc_active_canvas >= rc_canvas.size())
        return;

    if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
        return;

    *x = rc_canvas[rc_active_canvas].physics2D.world->GetGravity().x;
    *y = rc_canvas[rc_active_canvas].physics2D.world->GetGravity().y;
}




// Custom callback to collect all ray cast hits
class RayCastCallback : public b2RayCastCallback {
public:
    struct Hit {
        b2Fixture* fixture;
        b2Vec2 point;
        b2Vec2 normal;
        float fraction;
    };

    std::vector<Hit> hits;

    // This function is called for every fixture hit by the ray
    float ReportFixture(b2Fixture* fixture, const b2Vec2& point, const b2Vec2& normal, float fraction) override {
        hits.push_back({fixture, point, normal, fraction});
        return 1.0f; // Continue the ray cast to find all hits
    }
};

struct rc_rayHit2D_obj
{
	int sprite_id;
	b2Vec2 hit_point;
	b2Vec2 hit_normal;
};

std::vector<rc_rayHit2D_obj> rc_rayHit2D;

// Function to perform a ray cast and collect all hits
int rc_castRay2D_All(double from_x, double from_y, double to_x, double to_y)
{
	if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
		return 0;

	rc_rayHit2D.clear();
    RayCastCallback callback;
    const b2Vec2 point1(from_x, from_y);
    const b2Vec2 point2(to_x, to_y);

    rc_canvas[rc_active_canvas].physics2D.world->RayCast(&callback, point1, point2);

    std::vector<RayCastCallback::Hit> cb_hits = callback.hits;

    for(int i = 0; i < cb_hits.size(); i++)
	{
		rc_rayHit2D_obj hit;
		rc_sprite2D_obj* h_sprite = &rc_sprite[cb_hits[i].fixture->GetBody()->GetUserData().pointer];
		hit.sprite_id = h_sprite->id;
		hit.hit_point = cb_hits[i].point;
		hit.hit_normal = cb_hits[i].normal;
		rc_rayHit2D.push_back(hit);
	}

	return cb_hits.size();
}

// Function to perform a ray cast and collect the closest hit
int rc_castRay2D(double from_x, double from_y, double to_x, double to_y)
{
	if(rc_canvas[rc_active_canvas].type != RC_CANVAS_TYPE_SPRITE)
		return 0;

	rc_rayHit2D.clear();
    RayCastCallback callback;
    const b2Vec2 point1(from_x, from_y);
    const b2Vec2 point2(to_x, to_y);

    rc_canvas[rc_active_canvas].physics2D.world->RayCast(&callback, point1, point2);

    std::vector<RayCastCallback::Hit> cb_hits = callback.hits;

    float min_fraction = 0;
    int index = 0;

    for(int i = 0; i < cb_hits.size(); i++)
	{
		rc_rayHit2D_obj hit;
		rc_sprite2D_obj* h_sprite = &rc_sprite[cb_hits[i].fixture->GetBody()->GetUserData().pointer];
		hit.sprite_id = h_sprite->id;
		hit.hit_point = cb_hits[i].point;
		hit.hit_normal = cb_hits[i].normal;

		if(i == 0 || cb_hits[i].fraction < min_fraction)
		{
			min_fraction = cb_hits[i].fraction;
			index = rc_rayHit2D.size();
			rc_rayHit2D.push_back(hit);
		}
	}

	if(cb_hits.size() == 0)
		return 0;

	rc_rayHit2D_obj min_hit = rc_rayHit2D[index];
	rc_rayHit2D.clear();
	rc_rayHit2D.push_back(min_hit);

	return 1;
}

void rc_getRayHit2D(int index, double* spr_id, double* x, double* y, double* normal_x, double* normal_y)
{
	if(index < 0 || index >= rc_rayHit2D.size())
	{
		*spr_id = -1;
		return;
	}

	*spr_id = rc_rayHit2D[index].sprite_id;
	*x = rc_rayHit2D[index].hit_point.x;
	*y = rc_rayHit2D[index].hit_point.y;
	*normal_x = rc_rayHit2D[index].hit_normal.x;
	*normal_y = rc_rayHit2D[index].hit_normal.y;
}