using System.Collections.Generic;
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using UnityEngine;
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namespace Flexalon
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{
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internal class FlexalonRaycaster
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{
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public Vector3 hitPosition;
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private int _raycastFrame = 0;
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private FlexalonInteractable _hitInteractable;
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private readonly Dictionary<GameObject, FlexalonInteractable> _handles = new Dictionary<GameObject, FlexalonInteractable>();
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#if UNITY_UI
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private List<UnityEngine.EventSystems.RaycastResult> _graphicRaycastResult = new List<UnityEngine.EventSystems.RaycastResult>();
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#endif
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#if UNITY_PHYSICS
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private RaycastHit[] _raycastHits = new RaycastHit[10];
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#endif
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public void Register(FlexalonInteractable interactable)
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{
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_handles.Add(interactable.Handle, interactable);
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}
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public void Unregister(FlexalonInteractable interactable)
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{
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_handles.Remove(interactable.Handle);
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}
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public bool IsHit(Vector3 uiPointer, Ray ray, FlexalonInteractable interactable)
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{
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// Check if we've already casted this frame.
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if (_raycastFrame != Time.frameCount)
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{
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_hitInteractable = null;
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_raycastFrame = Time.frameCount;
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float minDistance = float.MaxValue;
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RaycastUI(uiPointer, ref minDistance);
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RaycastPhysics(ray, ref minDistance);
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}
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return _hitInteractable == interactable;
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}
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private void RaycastUI(Vector3 uiPointer, ref float minDistance)
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{
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#if UNITY_UI
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var eventSystem = UnityEngine.EventSystems.EventSystem.current;
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if (eventSystem)
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{
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eventSystem.RaycastAll(new UnityEngine.EventSystems.PointerEventData(eventSystem)
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{
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position = uiPointer
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}, _graphicRaycastResult);
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for (int i = 0; i < _graphicRaycastResult.Count; i++)
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{
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var hit = _graphicRaycastResult[i];
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if (hit.distance < minDistance)
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{
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if (_handles.TryGetValue(hit.gameObject, out var hitInteractable))
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{
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_hitInteractable = hitInteractable;
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minDistance = hit.distance;
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hitInteractable.UpdateCanvas();
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if (hitInteractable.Canvas?.renderMode == UnityEngine.RenderMode.ScreenSpaceOverlay)
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{
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hitPosition = hit.screenPosition;
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}
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else
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{
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hitPosition = hit.worldPosition;
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}
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}
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}
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}
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}
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#endif
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}
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private void RaycastPhysics(Ray ray, ref float minDistance)
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{
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#if UNITY_PHYSICS
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int hits = Physics.RaycastNonAlloc(ray, _raycastHits, 1000);
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// Find the nearest hit interactable.
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for (int i = 0; i < hits; i++)
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{
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var hit = _raycastHits[i];
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if (hit.distance < minDistance && _handles.TryGetValue(hit.collider.gameObject, out var hitInteractable))
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{
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_hitInteractable = hitInteractable;
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minDistance = hit.distance;
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hitPosition = hit.point;
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}
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}
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#endif
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}
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}
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}
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