Allow "reinterpretation" of framebuffer/zeta formats (#418)

* (Re)Implement format reinterpretation, other changes

* Implement writeback to guest memory, some refactoring

* More refactoring, implement reinterpretation the old way again

* Clean up

* Some fixes on M2MF (old Dma engine), added partial support for P2MF, fix conditional ssy, add Z24S8 zeta format, other fixes

* nit: Formatting

* Address PR feedback

1 files changed, 39 insertions, 9 deletions

diff --git a/Ryujinx.Graphics/Gal/GalImage.cs b/Ryujinx.Graphics/Gal/GalImage.cs
index dc6f02e0..92f43cc9 100644
--- a/Ryujinx.Graphics/Gal/GalImage.cs
+++ b/Ryujinx.Graphics/Gal/GalImage.cs
@@ -1,12 +1,17 @@
+using Ryujinx.Graphics.Texture;
+
 namespace Ryujinx.Graphics.Gal
 {
     public struct GalImage
     {
         public int Width;
         public int Height;
+        public int TileWidth;
+        public int GobBlockHeight;
+        public int Pitch;
 
-        public GalImageFormat Format;
-
+        public GalImageFormat   Format;
+        public GalMemoryLayout  Layout;
         public GalTextureSource XSource;
         public GalTextureSource YSource;
         public GalTextureSource ZSource;
@@ -15,19 +20,44 @@ namespace Ryujinx.Graphics.Gal
         public GalImage(
             int              Width,
             int              Height,
+            int              TileWidth,
+            int              GobBlockHeight,
+            GalMemoryLayout  Layout,
             GalImageFormat   Format,
             GalTextureSource XSource = GalTextureSource.Red,
             GalTextureSource YSource = GalTextureSource.Green,
             GalTextureSource ZSource = GalTextureSource.Blue,
             GalTextureSource WSource = GalTextureSource.Alpha)
         {
-            this.Width   = Width;
-            this.Height  = Height;
-            this.Format  = Format;
-            this.XSource = XSource;
-            this.YSource = YSource;
-            this.ZSource = ZSource;
-            this.WSource = WSource;
+            this.Width          = Width;
+            this.Height         = Height;
+            this.TileWidth      = TileWidth;
+            this.GobBlockHeight = GobBlockHeight;
+            this.Layout         = Layout;
+            this.Format         = Format;
+            this.XSource        = XSource;
+            this.YSource        = YSource;
+            this.ZSource        = ZSource;
+            this.WSource        = WSource;
+
+            Pitch = ImageUtils.GetPitch(Format, Width);
+        }
+
+        public bool SizeMatches(GalImage Image)
+        {
+            if (ImageUtils.GetBytesPerPixel(Format) !=
+                ImageUtils.GetBytesPerPixel(Image.Format))
+            {
+                return false;
+            }
+
+            if (ImageUtils.GetAlignedWidth(this) !=
+                ImageUtils.GetAlignedWidth(Image))
+            {
+                return false;
+            }
+
+            return Height == Image.Height;
         }
     }
 }
\ No newline at end of file