/// <summary>
/// 激活页表
/// </summary>
private TableNode ActivatePage(int x, int y, int mip)
{
if (mip > m_PageTable.MipLevel)
{
return(null);
}
// 找到当前可用的页表
var page = m_PageTable.GetAvailable(x, y, mip);
if (page == null)
{
// 没有可用页表，加载根节点
LoadPage(x, y, m_PageTable);
return(null);
}
else if (page.MipLevel > mip)
{
// 可用页表不是请求的mipmap等级，请求加载下一级
LoadPage(x, y, page.GetChild(x, y));
}
// 激活对应的平铺贴图块
m_TileTexture.SetActive(page.Payload.TileIndex);
page.Payload.ActiveFrame = Time.frameCount;
return(page);
}
private void UseOrCreatePagePointer(int x, int y, int mip, int frame)
{
if (mip > MaxMipLevel)
{
mip = MaxMipLevel;
}
var page = quadRoot.GetAvailable(x, y, mip);
if (page == null)
{
CreatePagePointer(x, y, quadRoot);
}
else
{
page.Payload.ActiveFrame = frame;
tileGenerator.SetActive(page.Payload.TileIndex);
if (page.MipLevel > mip)
{
CreatePagePointer(x, y, page.GetChild(x, y));
}
}
}