Salieri: shader cache (#1701)

Here come Salieri, my implementation of a disk shader cache!

"I'm sure you know why I named it that."
"It doesn't really mean anything."

This implementation collects shaders at runtime and cache them to be later compiled when starting a game.

Ryujinx.Graphics.Gpu/Image/TextureDescriptor.cs

@@ -1,3 +1,5 @@
+using Ryujinx.Graphics.Gpu.Shader.Cache.Definition;
+
 namespace Ryujinx.Graphics.Gpu.Image
 {
     /// <summary>
@@ -227,5 +229,24 @@ namespace Ryujinx.Graphics.Gpu.Image
         {
             return (TextureMsaaMode)((Word7 >> 8) & 0xf);
         }
+
+        /// <summary>
+        /// Create the equivalent of this TextureDescriptor for the shader cache.
+        /// </summary>
+        /// <returns>The equivalent of this TextureDescriptor for the shader cache.</returns>
+        public GuestTextureDescriptor ToCache()
+        {
+            GuestTextureDescriptor result = new GuestTextureDescriptor
+            {
+                Handle = uint.MaxValue,
+                Descriptor = this
+            };
+
+            // Clear the virtual address
+            result.Descriptor.Word0 = 0;
+            result.Descriptor.Word2 &= 0xFFFF0000;
+
+            return result;
+        }
     }
 }