do memory barriers

src/Ryujinx.Graphics.Metal/HelperShader.cs

@@ -73,6 +73,9 @@ namespace Ryujinx.Graphics.Metal
             _pipeline.SaveState();
 
             _pipeline.SetProgram(_programColorBlit);
+            // Viewport and scissor needs to be set before render pass begin so as not to bind the old ones
+            //_pipeline.SetViewports([]);
+            //_pipeline.SetScissors([]);
             _pipeline.SetRenderTargets([destination], null);
             _pipeline.SetTextureAndSampler(ShaderStage.Fragment, 0, source, new Sampler(sampler));
             _pipeline.SetPrimitiveTopology(PrimitiveTopology.Triangles);