protected void buildVertexData()
{
// accumulate the number of verts and triangles from the patches
int numVerts = 0;
int numTriangles = 0;
for (int z = 0; z < numTiles; z++)
{
for (int x = 0; x < numTiles; x++)
{
numVerts += terrainPatches[x, z].NumVerts;
numTriangles += terrainPatches[x, z].NumTriangles;
}
}
//
// Create the vertex buffer
//
VertexData localVertexData = new VertexData();
localVertexData.vertexCount = numVerts;
localVertexData.vertexStart = 0;
// free the original vertex declaration to avoid a leak
HardwareBufferManager.Instance.DestroyVertexDeclaration(localVertexData.vertexDeclaration);
localVertexData.vertexDeclaration = terrainVertexDeclaration;
// create the hardware vertex buffer and set up the buffer binding
HardwareVertexBuffer hvBuffer = HardwareBufferManager.Instance.CreateVertexBuffer(
localVertexData.vertexDeclaration.GetVertexSize(0), localVertexData.vertexCount,
BufferUsage.StaticWriteOnly, false);
localVertexData.vertexBufferBinding.SetBinding(0, hvBuffer);
renderOp.vertexData = localVertexData;
//
// Create the index buffer
//
IndexData localIndexData = new IndexData();
localIndexData.indexCount = numTriangles * 3;
localIndexData.indexStart = 0;
localIndexData.indexBuffer = HardwareBufferManager.Instance.CreateIndexBuffer(
IndexType.Size16, localIndexData.indexCount, BufferUsage.StaticWriteOnly);
renderOp.indexData = localIndexData;
// lock the vertex and index buffers
IntPtr vertexBufferPtr = hvBuffer.Lock(BufferLocking.Discard);
IntPtr indexBufferPtr = localIndexData.indexBuffer.Lock(BufferLocking.Discard);
int vertOff = 0;
int indexOff = 0;
for (int z = 0; z < numTiles; z++)
{
for (int x = 0; x < numTiles; x++)
{
TerrainPatch patch = terrainPatches[x, z];
int nv = patch.NumVerts;
int nt = patch.NumTriangles;
patch.BuildVertexIndexData(vertexBufferPtr, vertOff, indexBufferPtr, indexOff);
// update buffer offsets
vertOff += nv * VertexSize;
indexOff += (3 * nt);
}
}
// unlock the buffers
localIndexData.indexBuffer.Unlock();
hvBuffer.Unlock();
}
