Clone the state & flip viewport vertically (#16)

* implement texture get data

* reset all state before blit & clone state

* format

* support blit regions

* implement source region for blit

* replace bottom with top

* account for 0 size

* support image flipping

* revert presentation fixes & y flip

* revert

* flip viewport vertically

* switch face winding

* comment

* use SetBytes for texture clear

* implement missing compute builtins

* change storage and texture buffer alignment

* correct compute builtins

* don't use nullable for textures and samplers

* remove incorrect texture get data implementation

* Cleanup IntPtrs

---------

Co-authored-by: Isaac Marovitz <isaacryu@icloud.com>

src/Ryujinx.Graphics.Metal/MetalRenderer.cs

@@ -186,8 +186,8 @@ namespace Ryujinx.Graphics.Metal
                 maximumComputeSharedMemorySize: (int)_device.MaxThreadgroupMemoryLength,
                 maximumSupportedAnisotropy: 0,
                 shaderSubgroupSize: 256,
-                storageBufferOffsetAlignment: 0,
-                textureBufferOffsetAlignment: 0,
+                storageBufferOffsetAlignment: 16,
+                textureBufferOffsetAlignment: 16,
                 gatherBiasPrecision: 0
             );
         }