protected int SetIndexBuffer(IndexBufferDef indexbufferid)
{
KeyValuePair<Buffer, int> indexbuffer;
if (Indexbuffers.ContainsKey(indexbufferid.Id))
indexbuffer = Indexbuffers[indexbufferid.Id];
else
indexbuffer = AllocateIndexBuffer(indexbufferid);
Renderer.Context.InputAssembler.SetIndexBuffer(indexbuffer.Key, Format.R16_UInt, 0);
return indexbuffer.Value;
}
protected KeyValuePair<Buffer, int> AllocateIndexBuffer(IndexBufferDef indexbufferid)
{
var lod = indexbufferid.Lod;
var highword = indexbufferid.Highword;
var indicesStream = new DataStream(sizeof(uint) * QuadEdgeLength * (indexbufferid.Border == 0 ? 2 : 6), true, true);
var indicesCount = 0;
var borderwidth = 1 + lod;
switch (indexbufferid.Id & 0xF)
{
case 0x0://Quad Indices
for (int i = borderwidth; i < QuadEdgeLength - borderwidth; i++)
{
indicesStream.Write((short)(QuadEdgeLength * highword + i));
indicesStream.Write((short)i);
indicesCount += 2;
for (int j = 0; j < lod; j++)
if (i + 2 < QuadEdgeLength - borderwidth)//So last Index is always part
i++;
else
break;
}
break;
case 0x1://Border top
if ((indexbufferid.Id & 0x10) == 0x10)
{//stitch
#region BuildIndicesLists
var IndicesA = new List<int>();
for (int i = 0; i < QuadEdgeLength - borderwidth; i++)
{
IndicesA.Add(i * QuadEdgeLength);// * QuadEdgeLength for horizontal iteration (top & bot border)
for (uint j = 0; j < lod; j++)
if (i + 2 < QuadEdgeLength - borderwidth)//So last Index is always part
i++;
else
break;
}
IndicesA.Add(QuadEdgeLength-1);
var IndicesB = new List<int>();
var borderwidthB = (highword + 1);
for (int i = 0; i < QuadEdgeLength - borderwidthB; i++)
{
IndicesB.Add(i * QuadEdgeLength);// * QuadEdgeLength for horizontal iteration (top & bot border)
for (int j = 0; j < highword; j++)
if (i + 2 < QuadEdgeLength - borderwidthB)
i++;
else
break;
}
IndicesB.Add(QuadEdgeLength - 1);
#endregion
#region DrawStitchedBorder
int edgeanchor = IndicesA[1];
for (int i = 0; IndicesB[i] < edgeanchor; i++)
{//Draw left edge
indicesStream.Write((short)(edgeanchor + borderwidth));
indicesStream.Write((short)(IndicesB[i+1]));
indicesStream.Write((short)(IndicesB[i]));
indicesCount += 3;
}
for(int i = 1; i < IndicesA.Count - 2; i++)//-1 because right edge needs to be drawn seperately and -1 because each iteration uses i and i+1 as anchors
{
var anchorA = IndicesA[i];
var anchorB = IndicesA[i+1];
var partnerpoints = IndicesB.Where(index => index >= anchorA && index < anchorB).ToList();
partnerpoints.Add(IndicesB.First(index=> index>= anchorB));
var firstsmall = partnerpoints.Count/2;
for (int j = 0; j < firstsmall; j++)
{
indicesStream.Write((short)(anchorA + borderwidth));
indicesStream.Write((short)(partnerpoints[j + 1]));
indicesStream.Write((short)(partnerpoints[j]));
indicesCount += 3;
}
indicesStream.Write((short)(anchorA + borderwidth));
indicesStream.Write((short)(anchorB + borderwidth));
indicesStream.Write((short)(partnerpoints[firstsmall]));
indicesCount += 3;
for (int j = firstsmall; j < partnerpoints.Count-1; j++)
{
indicesStream.Write((short)(anchorB + borderwidth));
indicesStream.Write((short)(partnerpoints[j + 1]));
indicesStream.Write((short)(partnerpoints[j]));
indicesCount += 3;
}
}
edgeanchor = IndicesA[IndicesA.Count-2];
for (int i = IndicesB.Count-2; IndicesB[i] >= edgeanchor; i--)
{//Draw left edge
indicesStream.Write((short)(edgeanchor + borderwidth));
indicesStream.Write((short)(IndicesB[i+1]));
indicesStream.Write((short)(IndicesB[i]));
indicesCount += 3;
}
#endregion
}
else
{//nostitch
#region DrawNonStitchedBorder
indicesStream.Write((short)(0));
indicesStream.Write((short)((lod + 1)*QuadEdgeLength + borderwidth));
indicesStream.Write((short)((lod + 1) * QuadEdgeLength));
indicesCount += 3;
int i = borderwidth;
int nexti = i;
while(i < QuadEdgeLength - 1 - borderwidth)
{
for (int j = 0; j < lod + 1; j++)
if (nexti + 1 < QuadEdgeLength - borderwidth)//So last Index is always part
nexti++;
else
break; //j-loop
indicesStream.Write((short)(i*QuadEdgeLength));
indicesStream.Write((short)(i*QuadEdgeLength + borderwidth));
indicesStream.Write((short)(nexti * QuadEdgeLength));
indicesStream.Write((short)(nexti * QuadEdgeLength));
indicesStream.Write((short)(i*QuadEdgeLength + borderwidth));
indicesStream.Write((short)(nexti * QuadEdgeLength + borderwidth));
indicesCount += 6;
i = nexti;
}
int k = QuadEdgeLength - borderwidth - 1;
indicesStream.Write((short)(k*QuadEdgeLength));
indicesStream.Write((short)(k*QuadEdgeLength + borderwidth));
indicesStream.Write((short)((QuadEdgeLength - 1) * QuadEdgeLength));
indicesCount += 3;
indicesCount += 3;
#endregion
}
break;
case 0x2://Border bot
break;
case 0x4://Border left
break;
case 0x8://Border right
break;
}
indicesStream.Position = 0;
var buffer = new Buffer(Renderer.D3DDevice, indicesStream, sizeof(uint) * indicesCount, ResourceUsage.Default, BindFlags.IndexBuffer, CpuAccessFlags.None, ResourceOptionFlags.None, 0);
var indexbuffer = new KeyValuePair<Buffer, int>(buffer, indicesCount);
Indexbuffers.Add(indexbufferid.Id, indexbuffer);
indicesStream.Dispose();
return indexbuffer;
}
