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

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@1298 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
hrydgard 2008-11-25 23:56:57 +00:00
parent a95e804681
commit d0a48f654a
3 changed files with 33 additions and 5 deletions
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23
Source/Core/VideoCommon/Src/TextureDecoder.cpp
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@ -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) {