Unstable 0.17.0.0

Libraries/MonoGame.Framework/Src/MonoGame.Framework/Graphics/SpriteBatch.cs

@@ -237,9 +237,17 @@ namespace Microsoft.Xna.Framework.Graphics
         void CheckValid(Texture2D texture)
         {
             if (texture == null)
+            {
                 throw new ArgumentNullException("texture");
+            }
+            if (texture.IsDisposed)
+            {
+                throw new InvalidOperationException($"Texture is disposed");
+            }
             if (!_beginCalled)
+            {
                 throw new InvalidOperationException("Draw was called, but Begin has not yet been called. Begin must be called successfully before you can call Draw.");
+            }
         }
 
         void CheckValid(SpriteFont spriteFont, string text)
@@ -315,7 +323,7 @@ namespace Microsoft.Xna.Framework.Graphics
             }
         }
 
-        public void Draw(Texture2D texture, VertexPositionColorTexture[] vertices, float layerDepth)
+        public void Draw(Texture2D texture, VertexPositionColorTexture[] vertices, float layerDepth, int? count = null)
         {
             CheckValid(texture);
 
@@ -338,7 +346,7 @@ namespace Microsoft.Xna.Framework.Graphics
                     break;
             }
 
-            int iters = vertices.Length / 4;
+            int iters = count ?? (vertices.Length / 4);
             for (int i=0;i<iters;i++)
             {
                 var item = _batcher.CreateBatchItem();