Shader.cs

using OpenTK.Graphics.OpenGL4;
using System;
using System.IO;

namespace ShaderExample
{
    public class Shader
    {
        public int Handle { get; private set; }

        public Shader(string vertexPath, string fragmentPath)
        {
            string vertexShaderSource = File.ReadAllText(vertexPath);
            string fragmentShaderSource = File.ReadAllText(fragmentPath);

            int vertexShader = GL.CreateShader(ShaderType.VertexShader);
            GL.ShaderSource(vertexShader, vertexShaderSource);
            GL.CompileShader(vertexShader);
            CheckShaderCompileStatus(vertexShader);

            int fragmentShader = GL.CreateShader(ShaderType.FragmentShader);
            GL.ShaderSource(fragmentShader, fragmentShaderSource);
            GL.CompileShader(fragmentShader);
            CheckShaderCompileStatus(fragmentShader);

            Handle = GL.CreateProgram();
            GL.AttachShader(Handle, vertexShader);
            GL.AttachShader(Handle, fragmentShader);
            GL.LinkProgram(Handle);
            CheckProgramLinkStatus(Handle);

            GL.DetachShader(Handle, vertexShader);
            GL.DetachShader(Handle, fragmentShader);
            GL.DeleteShader(vertexShader);
            GL.DeleteShader(fragmentShader);
        }

        public void Use()
        {
            GL.UseProgram(Handle);
        }

        private void CheckShaderCompileStatus(int shader)
        {
            GL.GetShader(shader, ShaderParameter.CompileStatus, out int status);
            if (status == (int)All.False)
            {
                string infoLog = GL.GetShaderInfoLog(shader);
                throw new Exception($"Shader compilation failed: {infoLog}");
            }
        }

        private void CheckProgramLinkStatus(int program)
        {
            GL.GetProgram(program, GetProgramParameterName.LinkStatus, out int status);
            if (status == (int)All.False)
            {
                string infoLog = GL.GetProgramInfoLog(program);
                throw new Exception($"Program linking failed: {infoLog}");
            }
        }
    }
}