feat: OpenGL support

Author: JeremyMeissner

FreeFrame/Program.cs

@@ -1,13 +1,22 @@
 using OpenTK;
+using OpenTK.Mathematics;
 using OpenTK.Graphics;
+using OpenTK.Windowing.Common;
+using OpenTK.Windowing.Desktop;
 
 namespace FreeFrame
 {
     class Program
     {
         static void Main()
         {
-
+            NativeWindowSettings nativeWindowSettings = new()
+            {
+                Size = new Vector2i(600, 600),
+                Title = "FreeFrame"
+            };
+            using Window window = new(GameWindowSettings.Default, nativeWindowSettings);
+            window.Run();
         }
     }
-}
+}

FreeFrame/Window.cs

@@ -0,0 +1,63 @@
+using OpenTK.Windowing.Common;
+using OpenTK.Windowing.Desktop;
+using OpenTK.Graphics.OpenGL4;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FreeFrame
+{
+    class Window : GameWindow
+    {
+        int _vertexBuffer;
+
+        public readonly float[] _vertices =
+        {
+             0.0f, -0.5f, 0.0f, // Top
+            -0.5f,  0.5f, 0.0f, // Bottom-Left
+             0.5f,  0.5f, 0.0f  // Bottom-Right
+        };
+        public Window(GameWindowSettings gameWindowSettings, NativeWindowSettings nativeWindowSettings) : base(gameWindowSettings, nativeWindowSettings) { }
+        protected override void OnLoad()
+        {
+            base.OnLoad();
+            _vertexBuffer = GL.GenBuffer();
+            GL.BindBuffer(BufferTarget.ArrayBuffer, _vertexBuffer);
+            
+            GL.BufferData(BufferTarget.ArrayBuffer, _vertices.Length * sizeof(float), _vertices, BufferUsageHint.StaticDraw);
+
+            GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, 3 * sizeof(float), 0);
+            GL.EnableVertexAttribArray(0);
+
+        }
+        protected override void OnResize(ResizeEventArgs e)
+        {
+            base.OnResize(e);
+            // TODO: map the new NDC to the window
+        }
+        /// <summary>
+        /// Triggered at a fixed interval. (Logic, etc.)
+        /// </summary>
+        /// <param name="e"></param>
+        protected override void OnUpdateFrame(FrameEventArgs e)
+        {
+            base.OnUpdateFrame(e);
+        }
+        /// <summary>
+        /// Triggered as often as possible (fps). (Drawing, etc.)
+        /// </summary>
+        /// <param name="e"></param>
+        protected override void OnRenderFrame(FrameEventArgs e)
+        {
+            base.OnRenderFrame(e);
+            GL.DrawArrays(PrimitiveType.Triangles, 0, 3);
+        }
+        
+        protected override void OnUnload()
+        {
+            base.OnUnload();
+        }
+    }
+}