Added some basic camera stuff

TheRepo/TheLabs/MyExampleWindow.cs

@@ -21,10 +21,28 @@ namespace TheLabs
         // - Resources that only need to be created once
         private Mesh _cubeMesh;
         private Texture _cubeTexture;
+        private Texture _cubeTexture2;
         private float _rotation;
         
         // -- Scene Objects
         private RenderObject _cubeObject;
+        private RenderObject _cubeObject2;
+        
+        private Vector3 _cameraPosition = new Vector3(0.0f, 0.0f, -3.0f);
+        private Vector3 _cameraFront = new Vector3(0.0f, 0.0f, -1.0f);
+
+        private Vector3 _cameraUp = Vector3.UnitY;
+        
+        private float _yaw = -90.0f;
+        private float _pitch = 0.0f;
+        
+        private float _cameraSpeed = 2.5f;
+        private float _rotationSpeed = 50.0f;
+        
+        private float _mouseSensitivity = 0.1f; 
+
+        // This prevents a large camera jump when the window first gets focus
+        private bool _firstMove = true;
 
         public MyExampleWindow(GameWindowSettings gameWindowSettings, NativeWindowSettings nativeWindowSettings)
             : base(gameWindowSettings, nativeWindowSettings)
@@ -42,12 +60,17 @@ namespace TheLabs
             // Set The background color to a nice blue.
             GL.ClearColor(0.2f, 0.3f, 0.3f, 1.0f); 
             GL.Enable(EnableCap.DepthTest);
+            CursorState = CursorState.Grabbed;
             _shader = new Shader("Shaders/shader.vert", "Shaders/shader.frag");
             _cubeMesh = ShapeFactory.CreateTexturedCube();
-            _cubeTexture = new Texture("Textures/placeholder.png");
+            _cubeTexture = new Texture("Textures/stone.jpg");
+            _cubeTexture2 = new Texture("Textures/placeholder.png");
             _cubeObject = new RenderObject(_cubeMesh, _shader, _cubeTexture);
-            _cubeObject.Position = new Vector3(0.0f, 0.0f, -1.0f);
+            _cubeObject2 = new RenderObject(_cubeMesh, _shader, _cubeTexture2);
+            _cubeObject.Position = new Vector3(-1.5f, 0.0f, 0.0f);
+            _cubeObject2.Position = new Vector3(1.5f, 0.0f, 0.0f);
             _cubeObject.Scale = new Vector3(0.5f, 0.5f, 0.5f);
+            _cubeObject2.Scale = new Vector3(0.5f, 0.5f, 0.5f);
             
 
         }
@@ -60,9 +83,10 @@ namespace TheLabs
             // Clear the color buffer and the depth buffer
             GL.Clear(ClearBufferMask.DepthBufferBit | ClearBufferMask.ColorBufferBit);
             _cubeObject.Rotation = Quaternion.FromEulerAngles(_rotation * 0.5f, _rotation, 0); //
+            _cubeObject2.Rotation = Quaternion.FromEulerAngles(-_rotation * 0.5f, -_rotation, 0);
             
             // --- Set up Camera ---
-            Matrix4 view = Matrix4.CreateTranslation(0.0f, 0.0f, -3.0f);
+            Matrix4 view = Matrix4.LookAt(_cameraPosition, _cameraPosition + _cameraFront, _cameraUp);            
             float aspectRatio = (float)Size.X / Size.Y;
 
             // 2. Add a safety check for divide-by-zero
@@ -78,6 +102,7 @@ namespace TheLabs
             );
             
             _cubeObject.Draw(view, projection);
+            _cubeObject2.Draw(view, projection);
             
             SwapBuffers();
         }
@@ -85,7 +110,7 @@ namespace TheLabs
         protected override void OnUpdateFrame(FrameEventArgs e)
         {
             base.OnUpdateFrame(e);
-            _rotation += (float)e.Time ; 
+            _rotation += (float)e.Time;
             var input = KeyboardState;
 
             if (input.IsKeyDown(Keys.Escape))
@@ -93,8 +118,63 @@ namespace TheLabs
                 Close();
             }
 
+            if (!IsFocused)
+            {
+                _firstMove = true;
+                return;
             }
 
+            var mouuse = MouseState;
+            
+            if (_firstMove)
+            {
+                mouuse = MouseState;
+                _firstMove = false;
+            }
+            else
+            {
+                // Get the mouse's movement delta
+                float deltaX = mouuse.Delta.X;
+                float deltaY = mouuse.Delta.Y;
+        
+                // Apply sensitivity
+                _yaw += deltaX * _mouseSensitivity;
+                _pitch -= deltaY * _mouseSensitivity; // Y-axis is inverted
+            }
+            
+            
+            // --- Rotation (Arrow Keys) ---
+            if (input.IsKeyDown(Keys.Left))
+            {
+                _yaw -= _rotationSpeed * (float)e.Time;
+            }
+        if (input.IsKeyDown(Keys.Right))
+        {
+            _yaw += _rotationSpeed * (float)e.Time;
+        }
+        if (input.IsKeyDown(Keys.Up))
+        {
+            _pitch += _rotationSpeed * (float)e.Time;
+        }
+        if (input.IsKeyDown(Keys.Down))
+        {
+            _pitch -= _rotationSpeed * (float)e.Time;
+        }
+            _pitch = MathHelper.Clamp(_pitch, -89.0f, 89.0f);
+            Vector3 front;
+            front.X = MathF.Cos(MathHelper.DegreesToRadians(_yaw)) * MathF.Cos(MathHelper.DegreesToRadians(_pitch));
+            front.Y = MathF.Sin(MathHelper.DegreesToRadians(_pitch));
+            front.Z = MathF.Sin(MathHelper.DegreesToRadians(_yaw)) * MathF.Cos(MathHelper.DegreesToRadians(_pitch));
+            _cameraFront = Vector3.Normalize(front);
+            var _cameraRight = Vector3.Normalize(Vector3.Cross(_cameraFront, _cameraUp));            
+            if (input.IsKeyDown(Keys.W)) _cameraPosition += _cameraFront * _cameraSpeed * (float)e.Time;
+            if (input.IsKeyDown(Keys.S)) _cameraPosition -= _cameraFront * _cameraSpeed * (float)e.Time;
+            if (input.IsKeyDown(Keys.A)) _cameraPosition -= _cameraRight * _cameraSpeed * (float)e.Time;
+            if (input.IsKeyDown(Keys.D)) _cameraPosition += _cameraRight * _cameraSpeed * (float)e.Time;
+        
+        }
+        
+
         protected override void OnResize(ResizeEventArgs e)
         {
             base.OnResize(e);