Add support for alpha to coverage dithering (#3069)

* Add support for alpha to coverage dithering

* Shader cache version bump

* Fix wrong alpha register

* Ensure support buffer is cleared

* New shader specialization based approach

Ryujinx.Graphics.Gpu/Shader/GpuAccessor.cs

@@ -66,6 +66,12 @@ namespace Ryujinx.Graphics.Gpu.Shader
             return MemoryMarshal.Cast<byte, ulong>(_channel.MemoryManager.GetSpan(address, size));
         }
 
+        /// <inheritdoc/>
+        public bool QueryAlphaToCoverageDitherEnable()
+        {
+            return _state.GraphicsState.AlphaToCoverageEnable && _state.GraphicsState.AlphaToCoverageDitherEnable;
+        }
+
         /// <inheritdoc/>
         public int QueryBindingConstantBuffer(int index)
         {