internal override uint[] Search(RenderEventArgs arg,
int x, int y,
uint lastVertexId, ZeroIndexRenderer modernRenderer)
{
OneIndexBufferPtr indexBufferPtr = null;
using (var buffer = new OneIndexBuffer(IndexElementType.UInt, DrawMode.Lines, BufferUsage.StaticDraw))
{
buffer.Create(8);
unsafe
{
var array = (uint *)buffer.Header.ToPointer();
array[0] = lastVertexId - 1; array[1] = lastVertexId - 0;
array[2] = lastVertexId - 2; array[3] = lastVertexId - 1;
array[4] = lastVertexId - 3; array[5] = lastVertexId - 2;
array[6] = lastVertexId - 0; array[7] = lastVertexId - 3;
}
indexBufferPtr = buffer.GetBufferPtr() as OneIndexBufferPtr;
}
modernRenderer.Render4InnerPicking(arg, indexBufferPtr);
uint id = ColorCodedPicking.ReadPixel(x, arg.CanvasRect.Height - y - 1);
indexBufferPtr.Dispose();
if (id + 3 == lastVertexId)
{
return(new uint[] { id + 3, id, });
}
else
{
return(new uint[] { id - 1, id, });
}
}
internal override uint[] Search(RenderEventArgs arg,
int x, int y,
uint lastVertexId, ZeroIndexRenderer modernRenderer)
{
ZeroIndexBufferPtr zeroIndexBufferPtr = modernRenderer.IndexBufferPtr;
ZeroIndexBufferPtr indexBufferPtr = null;
// when the temp index buffer could be long, it's no longer needed.
// what a great OpenGL API design!
using (var buffer = new ZeroIndexBuffer(DrawMode.LineLoop,
zeroIndexBufferPtr.FirstVertex, zeroIndexBufferPtr.VertexCount))
{
indexBufferPtr = buffer.GetBufferPtr() as ZeroIndexBufferPtr;
}
modernRenderer.Render4InnerPicking(arg, indexBufferPtr);
uint id = ColorCodedPicking.ReadPixel(x, arg.CanvasRect.Height - y - 1);
indexBufferPtr.Dispose();
if (id == zeroIndexBufferPtr.FirstVertex)
{
return(new uint[] { (uint)(zeroIndexBufferPtr.FirstVertex + zeroIndexBufferPtr.VertexCount - 1), id, });
}
else
{
return(new uint[] { id - 1, id, });
}
}