// ------------------------------------
// ------------------------------------
/// <summary>
/// Creates a new PatchMesh.
/// </summary>
/// <remarks>
/// As defined in <see cref="MeshManager.CreateBezierPatch" />.
/// </remarks>
public PatchMesh(string name, System.Array controlPointBuffer, VertexDeclaration declaration,
int width, int height, int uMaxSubdivisionLevel, int vMaxSubdivisionLevel, VisibleSide visibleSide,
BufferUsage vbUsage, BufferUsage ibUsage, bool vbUseShadow, bool ibUseShadow)
: base(name)
{
vertexBufferUsage = vbUsage;
useVertexShadowBuffer = vbUseShadow;
indexBufferUsage = ibUsage;
useIndexShadowBuffer = ibUseShadow;
// Init patch builder
// define the surface
// NB clone the declaration to make it independent
vertexDeclaration = (VertexDeclaration)declaration.Clone();
patchSurface.DefineSurface(controlPointBuffer, vertexDeclaration, width, height,
PatchSurfaceType.Bezier, uMaxSubdivisionLevel, vMaxSubdivisionLevel, visibleSide);
}
protected void CreateCpuVertexData()
{
if ( this.mVertexDataRecord != null )
{
DestroyCpuVertexData();
// create vertex structure, not using GPU for now (these are CPU structures)
var dcl = new VertexDeclaration();
var bufbind = new VertexBufferBinding();
this.mVertexDataRecord.CpuVertexData = new VertexData( dcl, bufbind );
// Vertex declaration
// TODO: consider vertex compression
int offset = 0;
// POSITION
// float3(x, y, z)
offset += dcl.AddElement( POSITION_BUFFER, offset, VertexElementType.Float3, VertexElementSemantic.Position ).Size;
// UV0
// float2(u, v)
// TODO - only include this if needing fixed-function
offset +=
dcl.AddElement( POSITION_BUFFER, offset, VertexElementType.Float2, VertexElementSemantic.TexCoords, 0 ).Size;
// UV1 delta information
// float2(delta, deltaLODthreshold)
offset = 0;
offset += dcl.AddElement( DELTA_BUFFER, offset, VertexElementType.Float2, VertexElementSemantic.TexCoords, 1 ).Size;
// Calculate number of vertices
// Base geometry size * size
var baseNumVerts = (int)Utility.Sqr( this.mVertexDataRecord.Size );
var numVerts = baseNumVerts;
// Now add space for skirts
// Skirts will be rendered as copies of the edge vertices translated downwards
// Some people use one big fan with only 3 vertices at the bottom,
// but this requires creating them much bigger that necessary, meaning
// more unnecessary overdraw, so we'll use more vertices
// You need 2^levels + 1 rows of full resolution (max 129) vertex copies, plus
// the same number of columns. There are common vertices at intersections
var levels = this.mVertexDataRecord.TreeLevels;
this.mVertexDataRecord.NumSkirtRowsCols = (ushort)( System.Math.Pow( 2, levels ) + 1 );
this.mVertexDataRecord.SkirtRowColSkip =
(ushort)( ( this.mVertexDataRecord.Size - 1 )/( this.mVertexDataRecord.NumSkirtRowsCols - 1 ) );
numVerts += this.mVertexDataRecord.Size*this.mVertexDataRecord.NumSkirtRowsCols;
numVerts += this.mVertexDataRecord.Size*this.mVertexDataRecord.NumSkirtRowsCols;
//manually create CPU-side buffer
var posBuf = HardwareBufferManager.Instance.CreateVertexBuffer( dcl.Clone( POSITION_BUFFER ), numVerts,
BufferUsage.StaticWriteOnly, false );
var deltabuf = HardwareBufferManager.Instance.CreateVertexBuffer( dcl.Clone( DELTA_BUFFER ), numVerts,
BufferUsage.StaticWriteOnly, false );
this.mVertexDataRecord.CpuVertexData.vertexStart = 0;
this.mVertexDataRecord.CpuVertexData.vertexCount = numVerts;
var updateRect = new Rectangle( this.mOffsetX, this.mOffsetY, this.mBoundaryX, this.mBoundaryY );
UpdateVertexBuffer( posBuf, deltabuf, updateRect );
this.mVertexDataRecord.IsGpuVertexDataDirty = true;
bufbind.SetBinding( POSITION_BUFFER, posBuf );
bufbind.SetBinding( DELTA_BUFFER, deltabuf );
}
}
public void Define( Array controlPointArray, VertexDeclaration declaration, int width, int height,
int uMaxSubdivisionLevel, int vMaxSubdivisionLevel, VisibleSide visibleSide, BufferUsage vbUsage,
BufferUsage ibUsage, bool vbUseShadow, bool ibUseShadow )
{
VertexBufferUsage = vbUsage;
UseVertexShadowBuffer = vbUseShadow;
IndexBufferUsage = ibUsage;
UseIndexShadowBuffer = ibUseShadow;
// Init patch builder
// define the surface
// NB clone the declaration to make it independent
this.vertexDeclaration = (VertexDeclaration)declaration.Clone();
this.patchSurface.DefineSurface( controlPointArray, this.vertexDeclaration, width, height, PatchSurfaceType.Bezier,
uMaxSubdivisionLevel, vMaxSubdivisionLevel, visibleSide );
}
