Improve safe texture cache - now using sparse CRC to identify textures. Far less video glitches - metroid intro looks good.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@1298 8ced0084-cf51-0410-be5f-012b33b47a6e

1 files changed, 23 insertions, 0 deletions

diff --git a/Source/Core/VideoCommon/Src/TextureDecoder.cpp b/Source/Core/VideoCommon/Src/TextureDecoder.cpp
index 295577ced7..f094139d27 100644
--- a/Source/Core/VideoCommon/Src/TextureDecoder.cpp
+++ b/Source/Core/VideoCommon/Src/TextureDecoder.cpp
@@ -57,6 +57,29 @@ int TexDecoder_GetTexelSizeInNibbles(int format)
     }

 }

 

+int TexDecoder_GetTextureSizeInBytes(int width, int height, int format)

+{

+	return (width * height * TexDecoder_GetTexelSizeInNibbles(format)) / 4;

+}

+

+u32 TexDecoder_GetSafeTextureHash(const u8 *src, int width, int height, int texformat)

+{

+	int sz = TexDecoder_GetTextureSizeInBytes(width, height, texformat);

+	u32 hash = 0x1337c0de;

+	if (sz < 2048) {

+		for (int i = 0; i < sz / 4; i += 13) {

+			hash = _rotl(hash, 17) ^ ((u32 *)src)[i];

+		}

+		return hash;

+	} else {

+		int step = sz / 13 / 4;

+		for (int i = 0; i < sz / 4; i += step) {

+			hash = _rotl(hash, 17) ^ ((u32 *)src)[i];

+		}

+	}

+	return hash;

+}

+

 int TexDecoder_GetBlockWidthInTexels(int format)

 {

     switch (format) {