From e98a273b5472af8b8d4a1d1e055c03856356c289 Mon Sep 17 00:00:00 2001
From: Rodolfo Osvaldo Bogado <rodolfoosvaldobogado@gmail.com>
Date: Wed, 3 Feb 2010 14:13:03 +0000
Subject: fixes for my last commit: chage the global format of the screenshots
 to bmp, is correctly supported by both plugins and is faster. reverted the
 changes in safe texture cache, will try to make them more stable then commit
 them, this should fix compilation in linux and macand error introduced in MP
 games corrected all the issues commented by ector, thanks for the comments
 alway is good that the code is revised by others to find missed spots. please
 report any remaining issue to solve them.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5001 8ced0084-cf51-0410-be5f-012b33b47a6e
---
 Source/Core/VideoCommon/Src/TextureDecoder.cpp | 32 +++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

(limited to 'Source/Core/VideoCommon/Src/TextureDecoder.cpp')

diff --git a/Source/Core/VideoCommon/Src/TextureDecoder.cpp b/Source/Core/VideoCommon/Src/TextureDecoder.cpp
index d49633609c..c6db5582bb 100644
--- a/Source/Core/VideoCommon/Src/TextureDecoder.cpp
+++ b/Source/Core/VideoCommon/Src/TextureDecoder.cpp
@@ -88,7 +88,7 @@ int TexDecoder_GetTextureSizeInBytes(int width, int height, int format)
 	return (width * height * TexDecoder_GetTexelSizeInNibbles(format)) / 2;
 }
 
-u64 TexDecoder_GetTlutHash(const u8* src, int len)
+/*u64 TexDecoder_GetTlutHash(const u8* src, int len)
 {
 	//char str[40000], st[20]; str[0]='\0';for (int i=0;i<len;i++){sprintf(st,"%02x ",src[i]);strcat(str,st);}
 	u64 hash = 0xbeefbabe1337c0de;
@@ -111,6 +111,36 @@ u64 TexDecoder_GetSafeTextureHash(const u8 *src, int width, int height, int texf
 	}	
 	return hash;
 }
+*/
+
+u32 TexDecoder_GetTlutHash(const u8* src, int len)
+{
+	//char str[40000], st[20]; str[0]='\0';for (int i=0;i<len;i++){sprintf(st,"%02x ",src[i]);strcat(str,st);}
+	u32 hash = 0xbeefbabe;
+	for (int i = 0; i < len / 4; i ++) {
+		hash = _rotl(hash, 7) ^ ((u32 *)src)[i];
+		hash += 7;	// to add a bit more entropy/mess in here
+	}
+	return hash;
+}
+
+u32 TexDecoder_GetSafeTextureHash(const u8 *src, int width, int height, int texformat, u32 seed)
+{
+	int sz = TexDecoder_GetTextureSizeInBytes(width, height, texformat);
+	u32 hash = seed ? seed : 0x1337c0de;
+	if (sz < 2048) {
+		for (int i = 0; i < sz / 4; i += 13) {
+			hash = _rotl(hash, 19) ^ ((u32 *)src)[i];
+		}
+		return hash;
+	} else {
+		int step = sz / 23 / 4;
+		for (int i = 0; i < sz / 4; i += step) {
+			hash = _rotl(hash, 19) ^ ((u32 *)src)[i];
+		}
+	}
+	return hash;
+}
 
 int TexDecoder_GetBlockWidthInTexels(u32 format)
 {
-- 
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