From 2ebe929fa5b9047cf925eb7d02ac4134c0f8a325 Mon Sep 17 00:00:00 2001
From: MutantAura <44103205+MutantAura@users.noreply.github.com>
Date: Sun, 26 May 2024 19:06:41 +0100
Subject: [PATCH] misc: Change disk shader cache compression algorithm to
 `Brotli` (RFC 7932) (#6841)

* Prefer `Brotli` compression for disk shader cache.

* Final default case for decompression switch.

* Prefer fastest compression.
---
 .../Shader/DiskCache/BinarySerializer.cs      | 39 +++++++++++++++++--
 .../Shader/DiskCache/CompressionAlgorithm.cs  |  5 +++
 .../Shader/DiskCache/DiskCacheCommon.cs       |  2 +-
 3 files changed, 41 insertions(+), 5 deletions(-)

diff --git a/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/BinarySerializer.cs b/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/BinarySerializer.cs
index c4a648fe..ab4508f6 100644
--- a/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/BinarySerializer.cs
+++ b/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/BinarySerializer.cs
@@ -125,9 +125,18 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
             CompressionAlgorithm algorithm = CompressionAlgorithm.None;
             Read(ref algorithm);
 
-            if (algorithm == CompressionAlgorithm.Deflate)
+            switch (algorithm)
             {
-                _activeStream = new DeflateStream(_stream, CompressionMode.Decompress, true);
+                case CompressionAlgorithm.None:
+                    break;
+                case CompressionAlgorithm.Deflate:
+                    _activeStream = new DeflateStream(_stream, CompressionMode.Decompress, true);
+                    break;
+                case CompressionAlgorithm.Brotli:
+                    _activeStream = new BrotliStream(_stream, CompressionMode.Decompress, true);
+                    break;
+                default:
+                    throw new ArgumentException($"Invalid compression algorithm \"{algorithm}\"");
             }
         }
 
@@ -139,9 +148,18 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
         {
             Write(ref algorithm);
 
-            if (algorithm == CompressionAlgorithm.Deflate)
+            switch (algorithm)
             {
-                _activeStream = new DeflateStream(_stream, CompressionLevel.Fastest, true);
+                case CompressionAlgorithm.None:
+                    break;
+                case CompressionAlgorithm.Deflate:
+                    _activeStream = new DeflateStream(_stream, CompressionLevel.Fastest, true);
+                    break;
+                case CompressionAlgorithm.Brotli:
+                    _activeStream = new BrotliStream(_stream, CompressionLevel.Fastest, true);
+                    break;
+                default:
+                    throw new ArgumentException($"Invalid compression algorithm \"{algorithm}\"");
             }
         }
 
@@ -187,6 +205,14 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
                     }
                     stream.Dispose();
                     break;
+                case CompressionAlgorithm.Brotli:
+                    stream = new BrotliStream(stream, CompressionMode.Decompress, true);
+                    for (int offset = 0; offset < data.Length;)
+                    {
+                        offset += stream.Read(data[offset..]);
+                    }
+                    stream.Dispose();
+                    break;
             }
         }
 
@@ -210,6 +236,11 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
                     stream.Write(data);
                     stream.Dispose();
                     break;
+                case CompressionAlgorithm.Brotli:
+                    stream = new BrotliStream(stream, CompressionLevel.Fastest, true);
+                    stream.Write(data);
+                    stream.Dispose();
+                    break;
             }
         }
     }
diff --git a/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/CompressionAlgorithm.cs b/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/CompressionAlgorithm.cs
index 96ddbb51..86d3de07 100644
--- a/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/CompressionAlgorithm.cs
+++ b/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/CompressionAlgorithm.cs
@@ -14,5 +14,10 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
         /// Deflate compression (RFC 1951).
         /// </summary>
         Deflate,
+
+        /// <summary>
+        /// Brotli compression (RFC 7932).
+        /// </summary>
+        Brotli,
     }
 }
diff --git a/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheCommon.cs b/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheCommon.cs
index c4ce0b87..cecfe9ac 100644
--- a/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheCommon.cs
+++ b/src/Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheCommon.cs
@@ -51,7 +51,7 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
         /// <returns>Compression algorithm</returns>
         public static CompressionAlgorithm GetCompressionAlgorithm()
         {
-            return CompressionAlgorithm.Deflate;
+            return CompressionAlgorithm.Brotli;
         }
     }
 }