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IndexBufferManager.cs    467 lines (397 with data), 20.6 kB

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using System;
using System.Collections;
using System.Diagnostics;
using Axiom.Graphics;
namespace Axiom.SceneManagers.Multiverse
{
/// <summary>
/// Summary description for IndexBufferManager.
/// </summary>
public class IndexBufferManager
{
private ArrayList tileIndexBuffers;
private Hashtable stitchIndexBuffers;
private IndexBufferManager()
{
tileIndexBuffers = new ArrayList();
stitchIndexBuffers = new Hashtable();
}
private static IndexBufferManager instance = null;
public static IndexBufferManager Instance
{
get
{
if (instance == null)
{
instance = new IndexBufferManager();
}
return instance;
}
}
public IndexData GetTileIndexBuffer(int size)
{
while (size >= tileIndexBuffers.Count)
{
tileIndexBuffers.Add(null);
}
if (tileIndexBuffers[size] == null)
{
tileIndexBuffers[size] = buildIndexData(size);
}
Debug.Assert(tileIndexBuffers[size] != null, "returning null index buffer");
return tileIndexBuffers[size] as IndexData;
}
private IndexData buildIndexData(int size)
{
IndexData indexData = new IndexData();
int bufLength = size * size * 6;
indexData.indexBuffer = HardwareBufferManager.Instance.CreateIndexBuffer(
IndexType.Size16, bufLength, BufferUsage.StaticWriteOnly);
IntPtr indexBufferPtr = (IntPtr)indexData.indexBuffer.Lock(0, indexData.indexBuffer.Size, BufferLocking.Discard).Ptr;
int indexCount = 0;
int pos = 0;
int i = 0;
unsafe
{
ushort* indexBuffer = (ushort*)indexBufferPtr.ToPointer();
for (int z = 0; z < size - 1; z++)
{
for (int x = 0; x < size - 1; x++)
{
indexBuffer[pos++] = (ushort)i;
indexBuffer[pos++] = (ushort)(i + size);
indexBuffer[pos++] = (ushort)(i + 1);
indexBuffer[pos++] = (ushort)(i + size);
indexBuffer[pos++] = (ushort)(i + 1 + size);
indexBuffer[pos++] = (ushort)(i + 1);
i++;
indexCount += 6;
}
i++;
}
}
indexData.indexBuffer.Unlock();
indexData.indexCount = indexCount;
indexData.indexStart = 0;
return indexData;
}
public IndexData GetStitchIndexBuffer(int numSamples, int northSamples, int eastSamples)
{
string name = String.Format("{0},{1},{2}", numSamples, northSamples, eastSamples);
IndexData indexData = this.stitchIndexBuffers[name] as IndexData;
if (indexData == null)
{
indexData = new IndexData();
int triangleCount = 0;
// count north triangles
if (northSamples != 0)
{
if (northSamples == numSamples)
{
triangleCount += ((numSamples - 1) * 2);
}
else if (northSamples > numSamples)
{
triangleCount += ((numSamples - 1) * 3);
}
else
{
triangleCount += ((northSamples - 1) * 3);
}
// count northeast triangles
if (eastSamples != 0)
{
if (eastSamples == northSamples)
{
if (eastSamples == numSamples)
{
triangleCount += 2;
}
else
{
triangleCount += 4;
}
}
else
{
triangleCount += 3;
}
}
}
// count east triangles
if (eastSamples != 0)
{
if (eastSamples == numSamples)
{
triangleCount += ((numSamples - 1) * 2);
}
else if (eastSamples > numSamples)
{
triangleCount += ((numSamples - 1) * 3);
}
else
{
triangleCount += ((eastSamples - 1) * 3);
}
}
int bufLength = triangleCount * 3;
indexData.indexBuffer = HardwareBufferManager.Instance.CreateIndexBuffer(
IndexType.Size16, bufLength, BufferUsage.StaticWriteOnly);
IntPtr indexBufferPtr = (IntPtr)indexData.indexBuffer.Lock(0, indexData.indexBuffer.Size, BufferLocking.Discard).Ptr;
int pos = 0;
unsafe
{
ushort* indexBuffer = (ushort*)indexBufferPtr.ToPointer();
int neighborOff;
int innerCornerOff = 0;
int outerCornerOff = 0;
if (northSamples == 0)
{
// there is no north side
neighborOff = numSamples;
outerCornerOff = numSamples;
}
else if (eastSamples == 0)
{
// there is no east side
neighborOff = numSamples;
}
else
{
neighborOff = (numSamples * 2) - 1;
innerCornerOff = numSamples - 1;
outerCornerOff = neighborOff + northSamples;
}
int eastTOff = 0;
int eastNOff = 0;
// generate north triangles
if (northSamples != 0)
{
int tOff = 0;
int nOff = neighborOff;
if (northSamples == numSamples)
{
for (int i = 0; i < (numSamples - 1); i++)
{
indexBuffer[pos++] = (ushort)tOff;
indexBuffer[pos++] = (ushort)nOff;
indexBuffer[pos++] = (ushort)(tOff + 1);
indexBuffer[pos++] = (ushort)nOff;
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)(tOff + 1);
nOff++;
tOff++;
}
}
else if (northSamples > numSamples)
{
for (int i = 0; i < (numSamples - 1); i++)
{
indexBuffer[pos++] = (ushort)tOff;
indexBuffer[pos++] = (ushort)nOff;
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)tOff;
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)(tOff + 1);
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)(nOff + 2);
indexBuffer[pos++] = (ushort)(tOff + 1);
nOff += 2;
tOff++;
}
}
else
{
for (int i = 0; i < (northSamples - 1); i++)
{
indexBuffer[pos++] = (ushort)tOff;
indexBuffer[pos++] = (ushort)nOff;
indexBuffer[pos++] = (ushort)(tOff + 1);
indexBuffer[pos++] = (ushort)nOff;
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)(tOff + 1);
indexBuffer[pos++] = (ushort)(tOff + 1);
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)(tOff + 2);
nOff++;
tOff += 2;
}
}
// draw northeast triangles
if (eastSamples != 0)
{
if (eastSamples == northSamples)
{
if (eastSamples == numSamples)
{ // neighbors same lod as tile
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)outerCornerOff;
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)outerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
eastTOff = innerCornerOff;
eastNOff = outerCornerOff + 1;
}
else
{ // neighbors lesser LOD
indexBuffer[pos++] = (ushort)(innerCornerOff - 1);
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)outerCornerOff;
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)outerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
indexBuffer[pos++] = (ushort)(innerCornerOff + 1);
eastTOff = innerCornerOff + 1;
eastNOff = outerCornerOff + 1;
}
}
else
{ // both neighbors exist. one is the same lod as tile.
if (northSamples == numSamples)
{
// LOD change is to the east
if (eastSamples < numSamples)
{
// lower LOD to east
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)outerCornerOff;
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)outerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
indexBuffer[pos++] = (ushort)(innerCornerOff + 1);
eastTOff = innerCornerOff + 1;
eastNOff = outerCornerOff + 1;
}
else
{
// higher LOD to east
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)outerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
indexBuffer[pos++] = (ushort)(outerCornerOff + 2);
eastTOff = innerCornerOff;
eastNOff = outerCornerOff + 2;
}
}
else
{
// LOD Change is to the north
if (northSamples < numSamples)
{
// lower LOD to north
indexBuffer[pos++] = (ushort)(innerCornerOff - 1);
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)outerCornerOff;
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)outerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
eastTOff = innerCornerOff;
eastNOff = outerCornerOff + 1;
}
else
{
// higher LOD to north
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff - 2);
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)innerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
indexBuffer[pos++] = (ushort)(outerCornerOff - 1);
indexBuffer[pos++] = (ushort)outerCornerOff;
indexBuffer[pos++] = (ushort)(outerCornerOff + 1);
eastTOff = innerCornerOff;
eastNOff = outerCornerOff + 1;
}
}
}
}
}
else
{
// no north neighbor
eastTOff = 0;
eastNOff = numSamples;
}
// draw east triangles
if (eastSamples != 0)
{
int tOff = eastTOff;
int nOff = eastNOff;
if (eastSamples == numSamples)
{
for (int i = 0; i < (numSamples - 1); i++)
{
indexBuffer[pos++] = (ushort)(tOff + 1);
indexBuffer[pos++] = (ushort)tOff;
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)tOff;
indexBuffer[pos++] = (ushort)nOff;
indexBuffer[pos++] = (ushort)(nOff + 1);
tOff++;
nOff++;
}
}
else if (eastSamples > numSamples)
{
for (int i = 0; i < (numSamples - 1); i++)
{
indexBuffer[pos++] = (ushort)tOff;
indexBuffer[pos++] = (ushort)nOff;
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)tOff;
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)(tOff + 1);
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)(nOff + 2);
indexBuffer[pos++] = (ushort)(tOff + 1);
nOff += 2;
tOff++;
}
}
else
{
for (int i = 0; i < (eastSamples - 1); i++)
{
indexBuffer[pos++] = (ushort)tOff;
indexBuffer[pos++] = (ushort)nOff;
indexBuffer[pos++] = (ushort)(tOff + 1);
indexBuffer[pos++] = (ushort)nOff;
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)(tOff + 1);
indexBuffer[pos++] = (ushort)(tOff + 1);
indexBuffer[pos++] = (ushort)(nOff + 1);
indexBuffer[pos++] = (ushort)(tOff + 2);
nOff++;
tOff += 2;
}
}
}
}
Debug.Assert(pos == (triangleCount * 3), "stitching:wrong number of indices generated");
indexData.indexBuffer.Unlock();
indexData.indexCount = triangleCount * 3;
indexData.indexStart = 0;
stitchIndexBuffers[name] = indexData;
}
return indexData;
}
}
}