From 3c1f62d6913930a8e83d374ff8187c1e6b1c52fb Mon Sep 17 00:00:00 2001
From: LunaMoo <moo@moo.moo>
Date: Sat, 6 May 2017 14:51:24 +0200
Subject: [PATCH] Expose XXHASH for Texture Replacement

---
 Core/TextureReplacer.cpp | 24 ++++++++++++++++++++++++
 Core/TextureReplacer.h   |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/Core/TextureReplacer.cpp b/Core/TextureReplacer.cpp
index d60e28b4b9..18a6cf17b3 100644
--- a/Core/TextureReplacer.cpp
+++ b/Core/TextureReplacer.cpp
@@ -82,6 +82,10 @@ bool TextureReplacer::LoadIni() {
 		// TODO: crc32c.
 		if (strcasecmp(hash.c_str(), "quick") == 0) {
 			hash_ = ReplacedTextureHash::QUICK;
+		} else if (strcasecmp(hash.c_str(), "xxh32") == 0) {
+			hash_ = ReplacedTextureHash::XXH32;
+		} else if (strcasecmp(hash.c_str(), "xxh64") == 0) {
+			hash_ = ReplacedTextureHash::XXH64;
 		} else {
 			ERROR_LOG(G3D, "Unsupported hash type: %s", hash.c_str());
 			return false;
@@ -180,6 +184,10 @@ u32 TextureReplacer::ComputeHash(u32 addr, int bufw, int w, int h, GETextureForm
 		switch (hash_) {
 		case ReplacedTextureHash::QUICK:
 			return StableQuickTexHash(checkp, sizeInRAM);
+		case ReplacedTextureHash::XXH32:
+			return DoReliableHash32(checkp, sizeInRAM, 0xBACD7814);
+		case ReplacedTextureHash::XXH64:
+			return DoReliableHash64(checkp, sizeInRAM, 0xBACD7814);
 		default:
 			return 0;
 		}
@@ -198,6 +206,22 @@ u32 TextureReplacer::ComputeHash(u32 addr, int bufw, int w, int h, GETextureForm
 			}
 			break;
 
+		case ReplacedTextureHash::XXH32:
+			for (int y = 0; y < h; ++y) {
+				u32 rowHash = DoReliableHash32(checkp, bytesPerLine, 0xBACD7814);
+				result = (result * 11) ^ rowHash;
+				checkp += stride;
+			}
+			break;
+
+		case ReplacedTextureHash::XXH64:
+			for (int y = 0; y < h; ++y) {
+				u32 rowHash = DoReliableHash64(checkp, bytesPerLine, 0xBACD7814);
+				result = (result * 11) ^ rowHash;
+				checkp += stride;
+			}
+			break;
+
 		default:
 			break;
 		}
diff --git a/Core/TextureReplacer.h b/Core/TextureReplacer.h
index b3fdc0d462..52c6330bf4 100644
--- a/Core/TextureReplacer.h
+++ b/Core/TextureReplacer.h
@@ -50,6 +50,8 @@ enum class ReplacedTextureAlpha {
 enum class ReplacedTextureHash {
 	// TODO: Maybe only support crc32c for now?
 	QUICK,
+	XXH32,
+	XXH64,
 };
 
 struct ReplacedTextureLevel {