/// <summary>
///
/// </summary>
public void Update()
{
//If no camera has been set, then return without doing anything
if (mSceneCam == null)
{
return;
}
//Calculate time since last update
long deltaTime = 0, tmp = 0;
tmp = mTimer.Milliseconds;
deltaTime = tmp - mLastTime;
mLastTime = tmp;
//Get camera position and speed
Vector3 camPos = ConvertToLocal(mSceneCam.DerivedPosition);
Vector3 camSpeed = Vector3.Zero;
if (deltaTime == 0)
{
camSpeed = new Vector3(0, 0, 0);
}
else
{
camSpeed = (camPos - mOldCamPos) / deltaTime;
}
mOldCamPos = camPos;
if (mPageLoader != null)
{
//Update the PageLoader
mPageLoader.FrameUpdate();
//Update all the page managers
bool enableCache = true;
GeometryPageManager prevMgr = null;
foreach (GeometryPageManager it in mMangerList)
{
GeometryPageManager mgr = it;
mgr.Update(deltaTime, camPos, camSpeed, enableCache, prevMgr);
prevMgr = mgr;
}
}
//Update misc. subsystems
StaticBillboardSet.UpdateAll(ConvertToLocal(Camera.DerivedDirection));
}
/// <summary>
///
/// </summary>
/// <param name="mgr"></param>
/// <param name="maxRange"></param>
/// <param name="transitionLength"></param>
protected void AddDetailLevel(GeometryPageManager mgr, float maxRange, float transitionLength)
{
//Calculate the near range
float minRange = 0;
if (mMangerList.Count > 0)
{
GeometryPageManager lastMgr = mMangerList[mMangerList.Count - 1];
minRange = lastMgr.FarRange;
}
//Error check
if (maxRange <= minRange)
{
throw new Exception("Closer detail levels must be added before farther ones");
}
//Setup the new manager
mgr.NearRange = minRange;
mgr.FarRange = maxRange;
mgr.Transition = transitionLength;
mMangerList.Add(mgr);
}
/// <summary>
///
/// </summary>
/// <param name="maxRange"></param>
/// <param name="transitionLength"></param>
/// <returns></returns>
public GeometryPageManager AddDetailLevel <T>(float maxRange, float transitionLength) where T : GeometryPage
{
//Create a new page manager
GeometryPageManager mgr = new GeometryPageManager(this);
//If vertex shaders aren't supported, don't use transitions
Root root = Root.Singleton;
float transLength = transitionLength;
if (!root.RenderSystem.Capabilities.HasCapability(MogreLibGraphics.Capabilities.VertexPrograms))
{
transLength = 0;
}
//Add it to the list (also initializing maximum viewing distance)
AddDetailLevel(mgr, maxRange, transLength);
//And initialize the paged (dependent on maximum viewing distance)
mgr.InitPages <T>(Bounds);
return(mgr);
}
/// <summary>
///
/// </summary>
/// <param name="deltaTime"></param>
/// <param name="campos"></param>
/// <param name="camSpeed"></param>
/// <param name="enableCache"></param>
/// <param name="prevManager"></param>
internal void Update(long deltaTime, Vector3 campos, Vector3 camSpeed, bool enableCache, GeometryPageManager prevManager)
{
//-- Cache new geometry pages --
//Cache 1 page ahead of the view ranges
float cacheDist = mFarTransDist + mMainGeom.PageSize;
float cacheDistSq = cacheDist * cacheDist;
//First calculate the general area where the pages will be processed
// 0,0 is the left top corner of the bounding box
int x1 = (int)System.Math.Floor(
((campos.x - cacheDist) - mGridBounds.Left) / mMainGeom.PageSize);
int x2 = (int)System.Math.Floor(
((campos.x + cacheDist) - mGridBounds.Left) / mMainGeom.PageSize);
int z1 = (int)System.Math.Floor(
((campos.z - cacheDist) - mGridBounds.Top) / mMainGeom.PageSize);
int z2 = (int)System.Math.Floor(
((campos.z + cacheDist) - mGridBounds.Top) / mMainGeom.PageSize);
if (mScrollBuffer != null)
{
//Check if the page grid needs to be scrolled
int shiftX = 0, shiftZ = 0;
if (x1 < 0)
{
shiftX = x1;
}
else if (x2 >= mGeomGridX - 1)
{
shiftX = x2 - (mGeomGridX - 1);
}
if (z1 < 0)
{
shiftZ = z1;
}
else if (z2 >= mGeomGridZ - 1)
{
shiftZ = z2 - (mGeomGridZ - 1);
}
if (shiftX != 0 || shiftZ != 0)
{
//Scroll grid
ScrollGridPages(shiftX, shiftZ);
//Update grid bounds and processing area
mGridBounds.Left += shiftX * mMainGeom.PageSize;
mGridBounds.Right += shiftX * mMainGeom.PageSize;
mGridBounds.Top += shiftZ * mMainGeom.PageSize;
mGridBounds.Bottom += shiftZ * mMainGeom.PageSize;
x1 -= shiftX; x2 -= shiftX;
z1 -= shiftZ; z2 -= shiftZ;
}
}
else
{
// make sure that values are inbounds
if (x2 >= mGeomGridX)
{
x2 = mGeomGridX - 1;
}
if (z2 >= mGeomGridZ)
{
z2 = mGeomGridZ - 1;
}
if (x1 < 0)
{
x1 = 0;
}
if (z1 < 0)
{
z1 = 0;
}
}
//Now, in that general area, find what pages are within the cacheDist radius
//Pages within the cacheDist radius will be added to the pending block list
//to be loaded later, and pages within farDist will be loaded immediately.
for (int x = x1; x <= x2; ++x)
{
for (int z = z1; z <= z2; ++z)
{
GeometryPage blk = GetGridPage(x, z);
float dx = campos.x - blk.CenterPoint.x;
float dz = campos.z - blk.CenterPoint.z;
float distSq = dx * dx + dz * dz;
//If the page is in the cache radius...
if (distSq <= cacheDistSq)
{
//If the block hasn't been loaded yet, it should be
if (!blk.IsLoaded)
{
//Test if the block's distance is between nearDist and farDist
if (distSq >= mNearDistSq && distSq < mFarTransDistSq)
{
//If so, load the geometry immediately
LoadPage(blk);
mLoadedList.Add(blk);
if (blk.IsPending)
{
mPendingList.Remove(blk);
blk.IsPending = false;
}
}
else
{
//Otherwise, add it to the pending geometry list (if not already)
//Pages in then pending list will be loaded later (see below)
if (!blk.IsPending)
{
mPendingList.Add(blk);
blk.IsPending = true;
}
}
}
else
{
//Set the inactive time to 0 (since the page is active). This
//must be done in order to keep it from expiring (and deleted).
//This way, blocks not in the cache radius won't have their
//inactivity clock reset, and they will expire in a few seconds.
blk.InactiveTime = 0;
}
}
}
}//end for
//Calculate cache speeds based on camera speed. This is important to keep the cache
//process running smooth, because if the cache can't keep up with the camera, the
//immediately visible pages will be forced to load instantly, which can cause
//noticeable and sudden stuttering. The cache system results in smoother performance
//because it smooths the loading tasks out across multiple frames. For example,
//instead of loading 10+ blocks every 2 seconds, the cache would load 1 block every
//200 milliseconds.
float speed = MogreLibMath.Utility.Sqrt(camSpeed.x * camSpeed.x + camSpeed.z * camSpeed.z);
long cacheInterval = 0;
if (speed == 0)
{
cacheInterval = mMaxCacheInterval;
}
else
{
cacheInterval = (long)((mMainGeom.PageSize * 0.8f) / (speed * mPendingList.Count));
if (cacheInterval > mMaxCacheInterval)
{
cacheInterval = mMaxCacheInterval;
}
}
int geomPageBegin = 0;
int geomPageEnd = mPendingList.Count - 1;
//GeometryPage i1 = null;
GeometryPage i2 = null;
//Now load a single geometry page periodically, based on the cacheInterval
mCacheTimer += deltaTime;
if (mCacheTimer >= cacheInterval && enableCache)
{
//Find a block to be loaded from the pending list
//i1 = mPendingList[geomPageBegin];
// i2 = mPendingList[geomPageEnd];
//while (i1 != i2)
GeometryPage[] pend = mPendingList.ToArray();
foreach (GeometryPage i1 in pend)
{
GeometryPage blk = i1;
//Remove it from the pending list
mPendingList.Remove(i1);
//if (geomPageBegin < mPendingList.Count)
// i1 = mPendingList[geomPageBegin++];
blk.IsPending = false;
//If it's within the geometry cache radius, load it and break out of the loop
float dx = campos.x - blk.CenterPoint.x;
float dz = campos.z - blk.CenterPoint.z;
float distSq = dx * dx + dz * dz;
if (distSq <= cacheDistSq)
{
LoadPage(blk);
mLoadedList.Add(blk);
blk = mLoadedList[mLoadedList.Count - 1];
enableCache = false;
break;
}
//Otherwise this will keep looping until an unloaded page is found
}
mCacheTimer = 0;
}
//-- Update existing geometry and impostors --
//Loop through each loaded geometry block
int loadPageBegin = 0;
int loadPageEnd = mLoadedList.Count - 1;
//i1 = mLoadedList[loadPageBegin];
// i2 = mLoadedList[loadPageEnd];
float halfPageSize = mMainGeom.PageSize * 0.5f;
//while (i1 != i2)
GeometryPage[] load = mLoadedList.ToArray();
foreach (GeometryPage i1 in load)
{
GeometryPage blk = i1;
//If the geometry has expired...
if (blk.InactiveTime >= mInactivePageLife)
{
//Unload it
UnLoadPage(blk);
mLoadedList.Remove(i1);
//if (loadPageBegin < mLoadedList.Count)
// i1 = mLoadedList[loadPageBegin];
}
else
{//Update it's visibility/fade status based on it's distance from the camera
bool visible = false;
float dx = campos.x - blk.CenterPoint.x;
float dz = campos.z - blk.CenterPoint.z;
float distSq = dx * dx + dz * dz;
float overlap = 0, tmp = 0;
tmp = blk.BoundingBox.Maximum.x - halfPageSize;
if (tmp > overlap)
{
overlap = tmp;
}
tmp = blk.BoundingBox.Maximum.z - halfPageSize;
if (tmp > overlap)
{
overlap = tmp;
}
tmp = blk.BoundingBox.Minimum.x + halfPageSize;
if (tmp > overlap)
{
overlap = tmp;
}
tmp = blk.BoundingBox.Minimum.z + halfPageSize;
if (tmp > overlap)
{
overlap = tmp;
}
float pageLengthSq = MogreLibMath.Utility.Sqr((mMainGeom.PageSize + overlap) * 1.41421356f);
if (distSq + pageLengthSq >= mNearDistSq && distSq - pageLengthSq < mFarTransDistSq)
{
//Fade the page when transitioning
bool enable = false;
float fadeNear = 0;
float fadeFar = 0;
if (mFadeEnabled && distSq + pageLengthSq >= mFarDistSq)
{
//Fade in
visible = true;
enable = true;
fadeNear = mFarDist;
fadeFar = mFarTransDist;
}
else if (prevManager != null && prevManager.mFadeEnabled && (distSq - pageLengthSq < prevManager.mFarTransDistSq))
{
//Fade out
visible = true;
enable = true;
fadeNear = prevManager.mFarDist + (prevManager.mFarTransDist - prevManager.mFarDist) * 0.5f;//This causes geometry to fade out faster than it fades in, avoiding a state where a transition appears semitransparent
fadeFar = prevManager.mFarDist;
}
//apply fade settings
if (enable != blk.IsFadeEnabled)
{
blk.SetFade(enable, fadeNear, fadeFar);
blk.IsFadeEnabled = enable;
}
}
//Non-fade visibility
if (distSq > mNearDistSq && distSq < mFarDistSq)
{
visible = true;
}
//Update visibility
if (visible)
{
//Show the page if it isn't visible
if (!blk.IsVisible)
{
blk.IsVisible = true;
}
}
else
{
//Hide the page if it's not already
if (blk.IsVisible)
{
blk.IsVisible = false;
}
}
//And update it
blk.Update();
//if (loadPageBegin < mLoadedList.Count)
// i1 = mLoadedList[loadPageBegin++];
}
//Increment the inactivity timer for the geometry
blk.InactiveTime += deltaTime;
}
}