using Khronos;
using OpenGL;
using System;
using System.Diagnostics;
using System.Text;

namespace GameApp
{
    // OpenGL-Tutorial-1/src/renderEngine/DisplayManager.java
    // ; https://github.com/TheThinMatrix/OpenGL-Tutorial-1/blob/master/src/renderEngine/DisplayManager.java
    // ; https://www.youtube.com/watch?v=VS8wlS9hF8E
    public class DisplayManager
    {
        GlControl _glControl;
        Gl.DebugProc _debugProc;

        public void createDisplay(GlControl glControl)
        {
            _debugProc = GLDebugMessageCallbackProc;
            _glControl = glControl;

            if (Gl.CurrentExtensions != null && Gl.CurrentExtensions.DebugOutput_ARB)
            {
                Gl.DebugMessageCallback(_debugProc, IntPtr.Zero);
                Gl.DebugMessageControl(Gl.DebugSource.DontCare, Gl.DebugType.DontCare, Gl.DebugSeverity.DontCare, 0, null, true);
            }

            if (Gl.CurrentVersion != null && Gl.CurrentVersion.Api == KhronosVersion.ApiGl && glControl.MultisampleBits > 0)
            {
                Gl.Enable(EnableCap.Multisample);
            }
        }

        private void GLDebugMessageCallbackProc(Gl.DebugSource source, Gl.DebugType type, uint id, Gl.DebugSeverity severity, int length, IntPtr message, IntPtr userParam)
        {
            string strMessage;

            unsafe
            {
                strMessage = Encoding.ASCII.GetString((byte*)message.ToPointer(), length);
            }

            Debug.WriteLine($"{source}, {type}, {severity}: {strMessage}");
        }

        public unsafe void updateDisplay()
        {
        }

        public void closeDisplay()
        {
        }
    }
}
