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Check for overflow. Fixes some fade effects

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This commit is contained in:
Ian Curtis 2016-05-30 23:10:56 +00:00
parent 9a49fefe12
commit ff8e9d6aad
1 changed files with 4 additions and 0 deletions
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4
Src/Graphics/New3D/PolyHeader.cpp
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@ -320,6 +320,10 @@ bool PolyHeader::AlphaTest()
UINT8 PolyHeader::Transparency() UINT8 PolyHeader::Transparency()
{ {
if (header[6] & 0x800000) { // check top bit to see if its 1. Star wars is writing 1 for opaque, but the rest of the bits are garbage and are ignored
return 255; // without this check we get overflow. In the SDK, values are explicitly clamped to 0-32.
}
return (UINT8)((((header[6] >> 18) & 0x3F) * 255) / 32.f); return (UINT8)((((header[6] >> 18) & 0x3F) * 255) / 32.f);
} }