/// <summary>
/// Find object on screen
/// </summary>
/// <param name="findshader">The shader to use for the find</param>
/// <param name="glstate">Render state</param>
/// <param name="pos">Position on screen of find point</param>
/// <param name="size">Screen size</param>
/// <returns>Return tuple of set, render group, render index in group, z of find, or null</returns>
public Tuple <int, int, int, float> Find(GLShaderPipeline findshader, GLRenderState glstate, Point pos, Size size)
{
var geo = findshader.GetShader <GLPLGeoShaderFindTriangles>(OpenTK.Graphics.OpenGL4.ShaderType.GeometryShader);
geo.SetScreenCoords(pos, size);
findshader.Start(null); // this clears the buffer
int setno = 0;
foreach (var s in set)
{
geo.SetGroup(setno++ << 18); // set the group marker for this group as a uniform (encoded in drawID in .W)
s.ObjectRenderer.Execute(findshader, glstate, noshaderstart: true); // execute find over ever set, not clearing the buffer
}
findshader.Finish(); // finish shader
var res = geo.GetResult();
if (res != null)
{
System.Diagnostics.Debug.WriteLine("Set Found something"); for (int i = 0; i < res.Length; i++)
{
System.Diagnostics.Debug.WriteLine(i + " = " + res[i]);
}
return(new Tuple <int, int, int, float>(((int)res[0].W) >> 18, ((int)res[0].W) & 0x3ffff, (int)res[0].Y, res[0].Z));
}
else
{
return(null);
}
}
