feat: adding an error log system

Author: JeremyMeissner

FreeFrame/Helper.cs

@@ -0,0 +1,43 @@
+using OpenTK.Graphics.OpenGL4;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FreeFrame
+{
+    static class Helper
+    {
+        private static DebugProc _debugProcCallback = DebugCallback;
+        static public void CheckErrors()
+        {
+            ErrorCode errorCode = GL.GetError();
+
+            while (errorCode != ErrorCode.NoError)
+            {
+                Console.WriteLine(errorCode.ToString());
+                errorCode = GL.GetError();
+            }
+        }
+        [DebuggerStepThrough]
+        static private void DebugCallback(DebugSource source, DebugType type, int id, DebugSeverity severity, int length, IntPtr message, IntPtr userParam)
+        {
+            string messageString = Marshal.PtrToStringAnsi(message, length); // Retrieve the string from the pointer
+
+            Console.WriteLine($"{severity} {type} | {messageString}");
+
+            if (type == DebugType.DebugTypeError)
+                throw new Exception("OpenGL error");
+        }
+        static public void DebugMode()
+        {
+            GL.DebugMessageCallback(_debugProcCallback, IntPtr.Zero);
+            GL.Enable(EnableCap.DebugOutput);
+            GL.Enable(EnableCap.DebugOutputSynchronous);
+        }
+
+    }
+}

FreeFrame/Shader.cs

@@ -45,6 +45,7 @@ public Shader(string uriVertexShader, string uriFragementShader)
             GL.DeleteShader(vertexShader);
             GL.DeleteShader(fragmentShader);
         }
+        public int GetUniformLocation(string uniform) => GL.GetUniformLocation(_program, uniform);
         public void Use() => GL.UseProgram(_program);
         ~Shader() => GL.DeleteProgram(_program);
     }

FreeFrame/Shaders/shader.frag

@@ -2,7 +2,9 @@
 
 layout(location = 0) out vec4 color;
 
+uniform vec4 u_Color;
+
 void main()
 {
-	color = vec4(0.5, 0.5, 0.5, 1.0);
+	color = u_Color;
 }

FreeFrame/Window.cs

@@ -39,6 +39,8 @@ protected override void OnLoad()
         {
             base.OnLoad();
 
+            Helper.DebugMode();
+
             GL.ClearColor(0.1f, 0.1f, 0.1f, 1.0f);
 
             // Vertex Buffer Object
@@ -95,8 +97,12 @@ protected override void OnRenderFrame(FrameEventArgs e)
             _shader.Use(); // Select current shader
             GL.BindVertexArray(_vertexArray); // Bind VAO for workspace (because ImGui binds another)
 
+            int uColorLocation = _shader.GetUniformLocation("u_Color");
+            GL.Uniform4(uColorLocation, 0.2f, 1.0f, 0.5f, 1.0f);
+
             GL.DrawElements(PrimitiveType.Triangles, _indices.Length, DrawElementsType.UnsignedInt, 0);
 
+
             _ImGuiController.Update(this, (float)e.Time); // TODO: Explain what's the point of this. Also explain why this order is necessary
             //ImGui.ShowDemoWindow();
             UI.Show(this);