public void UpdateQuad(QuadHandle _handle)
{
var handle = _handle.index;
var data = Data[handle];
Trace.Assert(handle < Handles.Count);
{
int[] verts = new int[4];
// vertexes
int vOffset = vPerQuad * handle;
for (int i = 0; i < 4; ++i)
{
var vIndex = i + vOffset;
verts[i] = vIndex;
vArray[vIndex] = new TVertex().GenVertex(data, i);
}
// indexes to those vertexes
// see the index diagram at https://github.com/MonoGame/MonoGame/blob/develop/MonoGame.Framework/Graphics/SpriteBatcher.cs
// except we flipped vertex 2 and 3
int iOffset = iPerQuad * handle;
iArray[iOffset + 0] = verts[0];
iArray[iOffset + 1] = verts[1];
iArray[iOffset + 2] = verts[2];
iArray[iOffset + 3] = verts[0];
iArray[iOffset + 4] = verts[2];
iArray[iOffset + 5] = verts[3];
}
handlesToUpdate.Add(_handle);
}
public QuadHandle AddQuad(TQuadData data)
{
var newHandle = new QuadHandle()
{
index = Handles.Count
};
Handles.Add(newHandle);
Trace.Assert(Handles.Count <= MaxQuads, "Too many quads added");
Data.Add(data);
UpdateQuad(newHandle);
return(newHandle);
}
public void RemoveQuad(QuadHandle toHandle)
{
var lastIndex = Handles.Count - 1;
var fromHandle = Handles[lastIndex];
// if they are equal, we don't need to do anything
if (toHandle.index != Handles.Count - 1)
{
// copy last into another position
Data[toHandle.index] = Data[lastIndex];
Handles[toHandle.index] = Handles[lastIndex];
// update the handle
fromHandle.index = toHandle.index;
UpdateQuad(fromHandle);
}
// remove the data for the last element
Data.RemoveAt(lastIndex);
Handles.RemoveAt(lastIndex);
}
