private void UpdateCamera(ALayerCamera layerCamera)
{
OnFirstRun();
Vector3 deltaPos = mainLayerCamera.Position - mainLayerCamera.StartPosition;
cameraXform.position = StartPosition + Vector3.Scale(deltaPos, parallaxScale);
InvokeCallbacks();
}
/// <summary>
/// 获取当前安全可视范围。
/// </summary>
/// <param name="layerCamera">层摄像机。</param>
/// <param name="minCoordinate">安全可视范围的最小坐标。</param>
/// <param name="maxCoordinate">安全可视范围的最大坐标。</param>
private void GetVisibleRange(ALayerCamera layerCamera, out float minCoordinate, out float maxCoordinate)
{
float halfLength = GetSafeVisibleAreaLength() * 0.5f;
float camPosition = GetOneDCoordinate(layerCamera.Position);
minCoordinate = camPosition - halfLength;
maxCoordinate = camPosition + halfLength;
}
/// <summary>
/// 将 GameObject 的 layer 设置为 层摄像机可见的第一个 layer。
/// 如果层摄像机没有可见层则保留 GameObject 原先设置。
/// </summary>
/// <param name="go">GameObject。</param>
/// <param name="layerCamera">层摄像机。</param>
protected void SetToCameraLayer(GameObject go, ALayerCamera layerCamera)
{
LayerMask layerMask = layerCamera.Camera.cullingMask;
int layer = layerMask.GetFirstLayer();
if (layer != -1)
{
go.layer = layer;
}
}
/// <summary>
/// 获取当前安全可视范围内（及向外扩展一个元素）元素最大索引和最小索引。
/// </summary>
/// <param name="layerCamera">层摄像机。</param>
/// <param name="nearElementIndex">近端场景元素索引。</param>
/// <param name="farElementIndex">远端场景元素索引。</param>
protected void GetVisibleElementsRange(ALayerCamera layerCamera,
out int nearElementIndex,
out int farElementIndex)
{
float minCoordinate;
float maxCoordinate;
GetVisibleRange(layerCamera, out minCoordinate, out maxCoordinate);
nearElementIndex = GetNearElementIndex(minCoordinate, elementCoordinates);
farElementIndex = GetFarElementIndex(maxCoordinate, elementCoordinates);
}
public override void OnBecameInvisible(ALayerCamera layerCamera)
{
if (!IsVisible)
{
return;
}
Assert.IsNotNull(entity);
entity.localScale = originalScale;
PoolManager.Despawn(entity);
entity = null;
IsVisible = false;
}
public override void OnBecameVisible(ALayerCamera layerCamera)
{
if (IsVisible)
{
return;
}
Assert.IsNull(entity);
entity = PoolManager.Spawn(PoolName, Prefab, Position, Rotation);
originalScale = entity.localScale;
entity.localScale = Vector3.Scale(originalScale, RelativeScale);
SetToCameraLayer(entity.gameObject, layerCamera);
IsVisible = true;
}
protected override void UpdateCulling(ALayerCamera layerCamera)
{
if (elementCoordinates.Count == 0)
{
return;
}
// 获取可见的最近和最远场景元素的索引值
int nearElementIndex;
int farElementIndex;
GetVisibleElementsRange(layerCamera, out nearElementIndex, out farElementIndex);
// 设置可视范围内的元素为可见
for (int i = nearElementIndex; i <= farElementIndex; i++)
{
if (!elements[i].IsVisible)
{
elements[i].OnBecameVisible(layerCamera);
}
}
// 回收身后的场景元素
if (positiveDirection == RelativeDirection.Positive)
{
int index = 0;
while (index < nearElementIndex)
{
SceneElementPool.Delete(elements[0]);
elements.RemoveAt(0);
elementCoordinates.RemoveAt(0);
index += 1;
}
}
else
{
int index = elements.Count - 1;
while (index > farElementIndex)
{
SceneElementPool.Delete(elements[index]);
elements.RemoveAt(index);
elementCoordinates.RemoveAt(index);
index -= 1;
}
}
}
/// <summary>
/// 摄像机更新回调。
/// </summary>
private void UpdateSpawn(ALayerCamera layerCamera)
{
float camViewPositiveDist;
float camViewNegativeDist;
GetCameraViewDistance(out camViewPositiveDist, out camViewNegativeDist);
if (filledPositiveDistance < camViewPositiveDist)
{
filledPositiveDistance =
SpawnToPositiveDistance(filledPositiveDistance, camViewPositiveDist, sceneCulling);
}
if (filledNegativeDistance > camViewNegativeDist)
{
filledNegativeDistance =
SpawnToNegativeDistance(filledNegativeDistance, camViewNegativeDist, sceneCulling);
}
}
protected override void UpdateCulling(ALayerCamera layerCamera)
{
if (elementCoordinates.Count == 0)
{
return;
}
// 获取可见的最近和最远场景元素的索引值
int nearElementIndex;
int farElementIndex;
GetVisibleElementsRange(layerCamera, out nearElementIndex, out farElementIndex);
// 设置可视范围内的元素为可见
for (int i = nearElementIndex; i <= farElementIndex; i++)
{
if (elements[i].IsVisible)
{
visibleElements.Remove(elements[i]);
}
else
{
elements[i].OnBecameVisible(layerCamera);
}
}
// 设置之前可见当前不可见的场景元素为不可见
foreach (ASceneElement element in visibleElements)
{
element.OnBecameInvisible(layerCamera);
}
// 重新填充当前可见元素集合
visibleElements.Clear();
for (int i = nearElementIndex; i <= farElementIndex; i++)
{
visibleElements.Add(elements[i]);
}
}
/// <summary> /// 更新场景元素的可见性。 /// </summary> /// <param name="layerCamera"></param> abstract protected void UpdateCulling(ALayerCamera layerCamera);
/// <summary> /// 元素变得不可见时回调。 /// </summary> abstract public void OnBecameInvisible(ALayerCamera layerCamera);
