C# Opengl 分析GPU執行時間

 

using OpenTK.Graphics.OpenGL4;
 
 
public class Measure_time
{
    private int[] ids = new int[1];
    public Measure_time() {
 
        GL.GenQueries(1, ids);
    }
 
    public void begin()
    {
       GL.BeginQuery(QueryTarget.TimeElapsed, ids[0]);
    }
 
    public bool is_end()
    {
        GL.GetQueryObject(ids[0], GetQueryObjectParam.QueryResultAvailable, out long result);
 
        return result > 0 ? true:false;
    }
    public  void end() //Unit nanosecond
    {
        GL.EndQuery(QueryTarget.TimeElapsed);
 
 
    }
    public  long result()
    {
        GL.GetQueryObject(ids[0], GetQueryObjectParam.QueryResult, out long result);
        return result;
    }
 
    public void release()
    {
        GL.DeleteQueries (1, ids);
    }
 
 
}