public TerrainQuadTreeNode( Terrain terrain, TerrainQuadTreeNode parent, ushort xOff, ushort yOff, ushort size,
ushort lod, ushort depth, ushort quadrant )
: base()
{
this.mTerrain = terrain;
this.mParent = parent;
this.mOffsetX = xOff;
this.mOffsetY = yOff;
this.mBoundaryX = (ushort)( xOff + size );
this.mBoundaryY = (ushort)( yOff + size );
this.mSize = size;
this.mBaseLod = lod;
this.mDepth = depth;
this.mQuadrant = quadrant;
this.mBoundingRadius = 0;
this.mCurrentLod = -1;
this.mMaterialLodIndex = 0;
this.mLodTransition = 0;
this.mChildWithMaxHeightDelta = null;
this.mSelfOrChildRendered = false;
this.mNodeWithVertexData = null;
this.mAABB = new AxisAlignedBox();
if ( this.mTerrain.MaxBatchSize < size )
{
var childSize = (ushort)( ( ( size - 1 )*0.5f ) + 1 );
var childOff = (ushort)( childSize - 1 );
var childLod = (ushort)( lod - 1 ); // LOD levels decrease down the tree (higher detail)
var childDepth = (ushort)( depth + 1 );
// create children
this.mChildren[ 0 ] = new TerrainQuadTreeNode( this.mTerrain, this, xOff, yOff, childSize, childLod, childDepth, 0 );
this.mChildren[ 1 ] = new TerrainQuadTreeNode( this.mTerrain, this, (ushort)( xOff + childOff ), yOff, childSize,
childLod,
childDepth, 1 );
this.mChildren[ 2 ] = new TerrainQuadTreeNode( this.mTerrain, this, xOff, (ushort)( yOff + childOff ), childSize,
childLod,
childDepth, 2 );
this.mChildren[ 3 ] = new TerrainQuadTreeNode( this.mTerrain, this, (ushort)( xOff + childOff ),
(ushort)( yOff + childOff ),
childSize, childLod, childDepth, 3 );
var ll = new LodLevel();
// non-leaf nodes always render with minBatchSize vertices
ll.BatchSize = this.mTerrain.MinBatchSize;
ll.MaxHeightDelta = 0;
ll.CalcMaxHeightDelta = 0;
this.mLodLevels.Add( ll );
}
else
{
//no children
Array.Clear( this.mChildren, 0, this.mChildren.Length );
// this is a leaf node and may have internal LODs of its own
var ownLod = this.mTerrain.NumLodLevelsPerLeaf;
Debug.Assert( lod == ( ownLod - 1 ), "The lod passed in should reflect the number of lods in a leaf" );
// leaf nodes always have a base LOD of 0, because they're always handling
// the highest level of detail
this.mBaseLod = 0;
var sz = this.mTerrain.MaxBatchSize;
while ( ownLod-- != 0 )
{
var ll = new LodLevel();
ll.BatchSize = sz;
ll.MaxHeightDelta = 0;
ll.CalcMaxHeightDelta = 0;
this.mLodLevels.Add( ll );
if ( ownLod != 0 )
{
sz = (ushort)( ( ( sz - 1 )*0.5 ) + 1 );
}
}
Debug.Assert( sz == this.mTerrain.MinBatchSize );
}
// local centre calculation
// because of pow2 +1 there is always a middle point
var midoffset = (ushort)( ( size - 1 )/2 );
var midpointX = (ushort)( this.mOffsetX + midoffset );
var midpointY = (ushort)( this.mOffsetY + midoffset );
//derive the local centry, but give it a height if 0
//TODO: - what if we actually centred this at the terrain height at this point?
//would this be better?
this.mTerrain.GetPoint( midpointX, midpointY, 0, ref this.mLocalCentre );
this.mMovable = new Movable( this );
this.mRend = new Rend( this );
}
public void PostDeltaCalculation( Rectangle rect )
{
if ( rect.Left <= this.mBoundaryX || rect.Right > this.mOffsetX || rect.Top <= this.mBoundaryY ||
rect.Bottom > this.mOffsetY )
{
// relevant to this node (overlaps)
// each non-leaf node should know which of its children transitions
// to the lower LOD level last, because this is the one which controls
// when the parent takes over
if ( !IsLeaf )
{
float maxChildDelta = -1;
TerrainQuadTreeNode childWithMaxHeightDelta = null;
for ( int i = 0; i < 4; i++ )
{
TerrainQuadTreeNode child = this.mChildren[ i ];
child.PostDeltaCalculation( rect );
float childData = child.GetLodLevel( (ushort)( child.LodCount - 1 ) ).CalcMaxHeightDelta;
if ( childData > maxChildDelta )
{
childWithMaxHeightDelta = child;
maxChildDelta = childData;
}
}
// make sure that our highest delta value is greater than all children's
// otherwise we could have some crossover problems
// for a non-leaf, there is only one LOD level
LodLevel tmp = this.mLodLevels[ 0 ];
tmp.CalcMaxHeightDelta = System.Math.Max( tmp.CalcMaxHeightDelta, maxChildDelta*(Real)1.05 );
this.mChildWithMaxHeightDelta = childWithMaxHeightDelta;
}
else
{
// make sure own LOD levels delta values ascend
for ( int i = 0; i < this.mLodLevels.Count - 1; i++ )
{
// the next LOD after this one should have a higher delta
// otherwise it won't come into affect further back like it should!
LodLevel tmp = this.mLodLevels[ i ];
LodLevel tmpPlus = this.mLodLevels[ i + 1 ];
tmpPlus.CalcMaxHeightDelta = System.Math.Max( tmpPlus.CalcMaxHeightDelta, tmp.CalcMaxHeightDelta*(Real)1.05 );
}
}
}
}
public Movable( TerrainQuadTreeNode parent )
: base()
{
this.mParent = parent;
}
public Rend( TerrainQuadTreeNode parent )
{
this.mParent = parent;
}
public void AssignVertexData( ushort treeDepthStart, ushort treeDepthEnd, ushort resolution, ushort sz )
{
Debug.Assert( treeDepthStart >= this.mDepth, "Should not be calling this" );
if ( this.mDepth == treeDepthStart )
{
//we own this vertex data
this.mNodeWithVertexData = this;
this.mVertexDataRecord = new VertexDataRecord( resolution, sz, (ushort)( treeDepthEnd - treeDepthStart ) );
CreateCpuVertexData();
//pass on to children
if ( !IsLeaf && treeDepthEnd > ( this.mDepth + 1 ) ) // treeDepthEnd is exclusive, and this is children
{
for ( int i = 0; i < 4; ++i )
{
this.mChildren[ i ].UseAncestorVertexData( this, treeDepthEnd, resolution );
}
}
}
else
{
Debug.Assert( !IsLeaf, "No more levels below this!" );
for ( int i = 0; i < 4; ++i )
{
this.mChildren[ i ].AssignVertexData( treeDepthStart, treeDepthEnd, resolution, sz );
}
}
}
public void UseAncestorVertexData( TerrainQuadTreeNode owner, int treeDepthEnd, int resolution )
{
this.mNodeWithVertexData = owner;
this.mVertexDataRecord = null;
if ( !IsLeaf && treeDepthEnd > ( this.mDepth + 1 ) ) // treeDepthEnd is exclusive, and this is children
{
for ( int i = 0; i < 4; i++ )
{
this.mChildren[ i ].UseAncestorVertexData( owner, treeDepthEnd, resolution );
}
}
}
public bool Prepare( ImportData importData )
{
FreeTemporaryResources();
FreeCPUResources();
CopyGlobalOptions();
//validate
if (
!( Bitwise.IsPow2( importData.TerrainSize - 1 ) && Bitwise.IsPow2( importData.MinBatchSize - 1 ) &&
Bitwise.IsPow2( importData.MaxBatchSize - 1 ) ) )
{
throw new AxiomException( "terrainSize, minBatchSize and maxBatchSize must all be n^2 + 1. Terrain.Prepare" );
}
if ( importData.MinBatchSize > importData.MaxBatchSize )
{
throw new AxiomException( "MinBatchSize must be less then or equal to MaxBatchSize. Terrain.Prepare" );
}
if ( importData.MaxBatchSize > TERRAIN_MAX_BATCH_SIZE )
{
throw new AxiomException( "MaxBatchSize must be not larger then {0} . Terrain.Prepare", TERRAIN_MAX_BATCH_SIZE );
}
Alignment = importData.TerrainAlign;
this.mSize = importData.TerrainSize;
this.mWorldSize = importData.WorldSize;
this.mLayerDecl = importData.LayerDeclaration;
CheckDeclaration();
this.mLayers = importData.LayerList;
CheckLayers( false );
DeriveUVMultipliers();
this.mMaxBatchSize = importData.MaxBatchSize;
this.mMinBatchSize = importData.MinBatchSize;
this.mPos = importData.Pos;
UpdateBaseScale();
DetermineLodLevels();
int numVertices = this.mSize*this.mSize;
this.mHeightData = new float[numVertices];
if ( importData.InputFloat != null )
{
if ( Utility.RealEqual( importData.InputBias, 0.0f ) && Utility.RealEqual( importData.InputScale, 1.0f ) )
{
//straigt copy
this.mHeightData = new float[numVertices];
Array.Copy( importData.InputFloat, this.mHeightData, this.mHeightData.Length );
}
else
{
// scale & bias, lets do it unsafe, should be faster :)
var src = importData.InputFloat;
for ( var i = 0; i < numVertices; ++i )
{
this.mHeightData[ i ] = ( src[ i ]*importData.InputScale ) + importData.InputBias;
}
}
}
else if ( importData.InputImage != null )
{
var img = importData.InputImage;
if ( img.Width != this.mSize || img.Height != this.mSize )
{
img.Resize( this.mSize, this.mSize );
}
// convert image data to floats
// Do this on a row-by-row basis, because we describe the terrain in
// a bottom-up fashion (ie ascending world coords), while Image is top-down
var pSrcBaseF = BufferBase.Wrap( img.Data );
var pHeightDataF = BufferBase.Wrap( this.mHeightData, mHeightData.Length * sizeof(float) );
for ( var i = 0; i < this.mSize; ++i )
{
var srcy = this.mSize - i - 1;
using ( var pSrc = pSrcBaseF + srcy*img.RowSpan )
{
using ( var pDest = pHeightDataF + i*this.mSize*sizeof ( float ) )
{
PixelConverter.BulkPixelConversion( pSrc, img.Format, pDest, PixelFormat.FLOAT32_R, this.mSize );
}
}
}
pSrcBaseF.Dispose();
pHeightDataF.Dispose();
if ( !Utility.RealEqual( importData.InputBias, 0.0f ) || !Utility.RealEqual( importData.InputScale, 1.0f ) )
{
for ( int i = 0; i < numVertices; ++i )
{
this.mHeightData[ i ] = ( this.mHeightData[ i ]*importData.InputScale ) + importData.InputBias;
}
}
}
else
{
// start with flat terrain
this.mHeightData = new float[this.mSize*this.mSize];
}
var deltaData = new float[numVertices];
this.mHeightDataPtr = BufferBase.Wrap( this.mHeightData,mHeightData.Length * sizeof(float) );
this.mDeltaDataPtr = BufferBase.Wrap( deltaData, deltaData.Length * sizeof(float) );
var numLevel = (ushort)(int)( NumLodLevels - 1 );
QuadTree = new TerrainQuadTreeNode( this, null, 0, 0, this.mSize, (ushort)( NumLodLevels - 1 ), 0, 0 );
QuadTree.Prepare();
//calculate entire terrain
var rect = new Rectangle();
rect.Top = 0;
rect.Bottom = this.mSize;
rect.Left = 0;
rect.Right = this.mSize;
CalculateHeightDeltas( rect );
FinalizeHeightDeltas( rect, true );
DistributeVertexData();
// Imported data is treated as modified because it's not saved
IsModified = true;
IsHeightDataModified = true;
return true;
}
public bool Prepare( StreamSerializer stream )
{
FreeTemporaryResources();
FreeCPUResources();
CopyGlobalOptions();
if ( stream.ReadChunkBegin( TERRAIN_CHUNK_ID, TERRAIN_CHUNK_VERSION ) == null )
{
return false;
}
byte align;
stream.Read( out align );
Alignment = (Alignment)align;
stream.Read( out this.mSize );
stream.Read( out this.mWorldSize );
stream.Read( out this.mMaxBatchSize );
stream.Read( out this.mMinBatchSize );
stream.Read( out this.mPos );
RootSceneNode.Position = this.mPos;
UpdateBaseScale();
DetermineLodLevels();
int numVertices = this.mSize*this.mSize;
this.mHeightData = new float[numVertices];
stream.Read( out this.mHeightData );
// layer declaration
if ( !ReadLayerDeclaration( ref stream, ref this.mLayerDecl ) )
{
return false;
}
CheckDeclaration();
// Layers
if ( !ReadLayerInstanceList( ref stream, this.mLayerDecl.Elements.Count, ref this.mLayers ) )
{
return false;
}
DeriveUVMultipliers();
// Packed layer blend data
var numLayers = (byte)this.mLayers.Count;
stream.Read( out this.mLayerBlendMapSize );
this.mLayerBlendSizeActual = this.mLayerBlendMapSize; // for now, until we check
//load packed CPU data
var numBlendTex = GetBlendTextureCount( numLayers );
for ( var i = 0; i < numBlendTex; ++i )
{
var fmt = GetBlendTextureFormat( (byte)i, numLayers );
var channels = PixelUtil.GetNumElemBytes( fmt );
var dataSz = channels*this.mLayerBlendMapSize*this.mLayerBlendMapSize;
var data = new byte[dataSz];
stream.Read( out data );
this.mCpuBlendMapStorage.AddRange( data );
}
//derived data
while ( !stream.IsEndOfChunk( TERRAIN_CHUNK_ID ) && stream.NextChunkId == TERRAINDERIVEDDATA_CHUNK_ID )
{
stream.ReadChunkBegin( TERRAINDERIVEDDATA_CHUNK_ID, TERRAINDERIVEDDATA_CHUNK_VERSION );
//name
var name = string.Empty;
stream.Read( out name );
ushort sz;
stream.Read( out sz );
if ( name == "normalmap" )
{
this.mNormalMapRequired = true;
var data = new byte[sz*sz*3];
stream.Read( out data );
using ( var pDataF = BufferBase.Wrap( data ) )
{
this.mCpuTerrainNormalMap = new PixelBox( sz, sz, 1, PixelFormat.BYTE_RGB, pDataF );
}
}
else if ( name == "colormap" )
{
IsGlobalColorMapEnabled = true;
GlobalColorMapSize = sz;
this.mCpuColorMapStorage = new byte[sz*sz*3];
stream.Read( out this.mCpuColorMapStorage );
}
else if ( name == "lightmap" )
{
this.mLightMapRequired = true;
LightMapSize = sz;
this.mCpuLightmapStorage = new byte[sz*sz];
stream.Read( out this.mCpuLightmapStorage );
}
else if ( name == "compositemap" )
{
this.mCompositeMapRequired = true;
this.mCompositeMapSize = sz;
this.mCpuCompositeMapStorage = new byte[sz*sz*4];
stream.Read( out this.mCpuCompositeMapStorage );
}
stream.ReadChunkEnd( TERRAINDERIVEDDATA_CHUNK_ID );
}
//Load delta data
var deltaData = new byte[ sizeof( float ) * numVertices ];
stream.Read( out deltaData );
this.mDeltaDataPtr = BufferBase.Wrap( deltaData );
//Create and load quadtree
QuadTree = new TerrainQuadTreeNode( this, null, 0, 0, this.mSize, (ushort)( NumLodLevels - 1 ), 0, 0 );
QuadTree.Prepare();
stream.ReadChunkEnd( TERRAIN_CHUNK_ID );
DistributeVertexData();
IsModified = false;
IsHeightDataModified = false;
return true;
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="terrain">The ultimate parent terrain</param>
/// <param name="parent">ptional parent node (in which case xoff, yoff are 0 and size must be entire terrain)</param>
/// <param name="xOff">Offsets from the start of the terrain data in 2D</param>
/// <param name="yOff">Offsets from the start of the terrain data in 2D</param>
/// <param name="size">The size of the node in vertices at the highest LOD</param>
/// <param name="lod">The base LOD level</param>
/// <param name="depth">The depth that this node is at in the tree (or convenience)</param>
/// <param name="quadrant">The index of the quadrant (0, 1, 2, 3)</param>
public TerrainQuadTreeNode(Terrain terrain, TerrainQuadTreeNode parent, ushort xOff, ushort yOff,
ushort size, ushort lod, ushort depth, ushort quadrant)
{
mTerrain = terrain;
mParent = parent;
mOffsetX = xOff;
mOffsetY = yOff;
mBoundaryX = (ushort)(xOff + size);
mBoundaryY = (ushort)(yOff + size);
mSize = size;
mBaseLod = lod;
mDepth = depth;
mQuadrant = quadrant;
mBoundingRadius = 0;
mCurrentLod = -1;
mMaterialLodIndex = 0;
mLodTransition = 0;
mChildWithMaxHeightDelta = null;
mSelfOrChildRendered = false;
mNodeWithVertexData = null;
// mMovable = null;
mRend = null;
mAABB = new AxisAlignedBox();
if (mTerrain.MaxBatchSize < size)
{
ushort childSize = (ushort)(((size - 1) * 0.5f) + 1);
ushort childOff = (ushort)(childSize - 1);
ushort childLod = (ushort)(lod - 1);
ushort childDepth = (ushort)(depth + 1);
mChildren[0] = new TerrainQuadTreeNode(mTerrain, this, xOff, yOff, childSize, childLod, childDepth, 0);
mChildren[1] = new TerrainQuadTreeNode(mTerrain, this, (ushort)(xOff + childOff), yOff, childSize, childLod, childDepth, 1);
mChildren[2] = new TerrainQuadTreeNode(mTerrain, this, xOff, (ushort)(yOff + childOff), childSize, childLod, childDepth, 2);
mChildren[3] = new TerrainQuadTreeNode(mTerrain, this, (ushort)(xOff + childOff), (ushort)(yOff + childOff), childSize, childLod, childDepth, 3);
LodLevel ll = new LodLevel();
// non-leaf nodes always render with minBatchSize vertices
ll.BatchSize = mTerrain.MinBatchSize;
ll.MaxHeightDelta = 0;
ll.CalcMaxHeightDelta = 0;
mLodLevels.Add(ll);
}
else
{
//no children
Array.Clear(mChildren, 0, mChildren.Length);
// this is a leaf node and may have internal LODs of its own
ushort ownLod = mTerrain.LodLevelsPerLeafCount;
Debug.Assert(lod == (ownLod - 1),
"The lod passed in should reflect the number of lods in a leaf");
// leaf nodes always have a base LOD of 0, because they're always handling
// the highest level of detail
mBaseLod = 0;
ushort sz = mTerrain.MaxBatchSize;
while (ownLod-- != 0)
{
LodLevel ll = new LodLevel();
ll.BatchSize = sz;
ll.MaxHeightDelta = 0;
ll.CalcMaxHeightDelta = 0;
mLodLevels.Add(ll);
if(ownLod != 0)
sz = (ushort)(((sz - 1) * 0.5) + 1);
}
Debug.Assert(sz == mTerrain.MinBatchSize);
}
// local centre calculation
// because of pow2 +1 there is always a middle point
ushort midoffset = (ushort)((size - 1) / 2);
ushort midpointX = (ushort)(mOffsetX + midoffset);
ushort midpointY = (ushort)(mOffsetY + midoffset);
//derive the local centry, but give it a height if 0
//TODO: - what if we actually centred this at the terrain height at this point?
//would this be better?
mTerrain.GetPoint(midpointX, midpointY, 0, ref mLocalCentre);
/*mRend = new Rend(this);
mMovable = new Movable(this,mRend);*/
mRend= new TerrainRendable(this);
SceneNode sn = mTerrain.RootSceneNode.CreateChildSceneNode(mLocalCentre);
sn.AttachObject(mRend);
// sn.AttachObject(mRend);
}
public TerrainRendable(TerrainQuadTreeNode parent)
{
mParent = parent;
this.MovableType = "AxiomTerrainNodeMovable";
}
/// <summary>
///
/// </summary>
/// <param name="parent"></param>
public Movable(TerrainQuadTreeNode parent, Rend renderable)
{
mParent = parent;
mRend = renderable;
}