Split draw and game loop

added some comments

Raster3D/Engine.cs

@@ -8,23 +8,29 @@ namespace Raster3D.Engine
 {
     public class Engine : Game
     {
+        // init the GDM and SpriteBatch systems
         private GraphicsDeviceManager _graphics;
         private SpriteBatch _spriteBatch;
 
-        public Pixel[] pixels;
-        public Renderer renderer = new Renderer();
-        public IRunnable TargetApplication;
 
-        public CGameLoop loop;
+        // init some internal engine values
+        public Pixel[] pixels; // the pixel array, RenderObjects directly modify this
+        public Renderer renderer = new Renderer(); // The rendering pipeline, while XNA has its own, we are using a "subset" of that to directly render pixels
+        public IRunnable TargetApplication; // the reference to the target application, passed into the constructor
+
+        public CGameLoop gameLoop; // the GameLoop, which is ran in the update
+        public CDrawLoop drawLoop; // this is the Drawing loop, this is where you would put all of your rendering code
 
 
-        public Engine(IRunnable Application, CGameLoop EngineLoop)
+
+        public Engine(IRunnable Application, CGameLoop EngineLoop, CDrawLoop DrawLoop)
         {
-            _graphics = new GraphicsDeviceManager(this);
-            Content.RootDirectory = "Content";
+            _graphics = new GraphicsDeviceManager(this); // init GDM
+            Content.RootDirectory = "Content"; // set content dir
             IsMouseVisible = true;
             TargetApplication = Application;
-            loop = EngineLoop;
+            gameLoop = EngineLoop;
+            drawLoop = DrawLoop;
         }
 
 
@@ -33,20 +39,25 @@ namespace Raster3D.Engine
         {
             // Allocate pixel array based on current viewport size
             pixels = new Pixel[GraphicsDevice.Viewport.Width * GraphicsDevice.Viewport.Height];
-            Window.Title = TargetApplication.WindowTitle;
+            Window.Title = TargetApplication.WindowTitle; // set the window title
             base.Initialize();
             
         }
 
         protected override void LoadContent()
         {
+            // initaialixze the spritebatch
             _spriteBatch = new SpriteBatch(GraphicsDevice);
         }
 
         protected override void Update(GameTime gameTime)
         {
-            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
-                Exit();
+            // exit function
+
+            if (gameLoop != null)
+            {
+                gameLoop.Update(this, gameTime); // call the gameloop update
+            }
 
             base.Update(gameTime);
         }
@@ -54,18 +65,18 @@ namespace Raster3D.Engine
         protected override void Draw(GameTime gameTime)
         {
 
-            if (loop != null)
+            if (drawLoop != null)
             {
-                loop.exec(this);
+                drawLoop.Draw(this, gameTime);
             }
 
 
-            GraphicsDevice.Clear(Color.Black);
-            _spriteBatch.Begin();
-            renderer.RenderFrame(pixels, _spriteBatch, GraphicsDevice, GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height);
-            _spriteBatch.End();
+            GraphicsDevice.Clear(Color.Black); // Clear the GPU buffer
+            _spriteBatch.Begin(); // start spriteBatch
+            renderer.RenderFrame(pixels, _spriteBatch, GraphicsDevice, GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height); // render teh frame
+            _spriteBatch.End(); // end the batch
 
-            base.Draw(gameTime);
+            base.Draw(gameTime); // call XNA internal draw call
         }
     }
 }

Raster3D/Impl/CDrawLoop.cs

@@ -0,0 +1,17 @@
+using Microsoft.Xna.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Raster3D.Engine.Impl
+{
+    public class CDrawLoop
+    {
+        public void Draw(Engine engine, GameTime time)
+        {
+
+        }
+    }
+}

Raster3D/Impl/CGameLoop.cs

@@ -3,12 +3,13 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using Microsoft.Xna.Framework;
 using Raster3D.Engine;
 
 namespace Raster3D.Engine.Impl
 {
     public abstract class CGameLoop
     {
-        public abstract void exec(Engine engine);
+        public abstract void Update(Engine engine, GameTime time);
     }
 }

Raster3D/OObjects.cs

@@ -1,78 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using Raster3D.Engine.Graphics;
-
-namespace Raster3D.Engine
-{
-    public class OObjects
-    {
-        public void Line(Vec2D pos1, Vec2D pos2, rgb clr, Engine engine)
-        {
-            int x0 = (int)pos1.X;
-            int y0 = (int)pos1.Y;
-            int x1 = (int)pos2.X;
-            int y1 = (int)pos2.Y;
-
-            int dx = Math.Abs(x1 - x0);
-            int dy = Math.Abs(y1 - y0);
-
-            int sx = x0 < x1 ? 1 : -1;
-            int sy = y0 < y1 ? 1 : -1;
-
-            int err = dx - dy;
-
-            int screenWidth = engine.GraphicsDevice.Viewport.Width;
-            int screenHeight = engine.GraphicsDevice.Viewport.Height;
-
-            while (true)
-            {
-                if (x0 >= 0 && x0 < screenWidth && y0 >= 0 && y0 < screenHeight)
-                {
-                    int index = (y0 * screenWidth) + x0;
-                    engine.pixels[index] = new Pixel(x0, y0, clr);
-                }
-
-                if (x0 == x1 && y0 == y1) break;
-
-                int e2 = 2 * err;
-
-                if (e2 > -dy)
-                {
-                    err -= dy;
-                    x0 += sx;
-                }
-
-                if (e2 < dx)
-                {
-                    err += dx;
-                    y0 += sy;
-                }
-            }
-        }
-
-        public void Triangle(Vec2D[] positions, rgb[] colors, Engine engine)
-        {
-            // positions should have a length of 3 and exactly 3
-            // colors has 3 points
-
-            // this just draws an array of lines
-
-            // line 1
-            Line(positions[0], positions[1], colors[0], engine); // pos1 - pos2
-
-            // line 2
-            Line(positions[1], positions[2], colors[1], engine); // pos2 - pos3
-
-            // line 3
-            Line(positions[2], positions[0], colors[2], engine); // pos3 - back to pos1
-        }
-
-        public void Square(Vec2D[] points, rgb[] colors, Engine engine)
-        {
-            // TODO: implemen t this
-        }
-    }
-}