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Fix #12220: Add Decompress Bc5 to Squish

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This Commit fixes the corrupted file preview described in #12220.
Added DecompressColourBc5 function to squish.
This commit is contained in:
Orkun
2017-11-19 02:24:31 +03:00
committed by Rémi Verschelde
parent 92a8a505a0
commit e021097c80
5 changed files with 246 additions and 1 deletions
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85
thirdparty/squish/colourblock.cpp vendored
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@@ -211,4 +211,89 @@ void DecompressColour( u8* rgba, void const* block, bool isDxt1 )
}
}
// -- Godot start --
void DecompressColourBc5( u8* rgba, void const* block)
{
// get the block bytes
u8 const* bytes = reinterpret_cast< u8 const* >( block );
// unpack the endpoints
u8 codes[16];
int red_0 = bytes[0];
int red_1 = bytes[1];
codes[0] = red_0;
codes[1] = red_1;
codes[6] = 0.0f;
codes[7] = 1.0f;
// generate the midpoints
if(red_0 > red_1)
{
for( int i = 2; i < 8; ++i )
{
codes[i] = ((8-i)*red_0 + (i-1)*red_1)/7;
}
}
else
{
for( int i = 2; i < 6; ++i )
{
codes[i] = ((6-i)*red_0 + (i-1)*red_1)/5;
}
}
int green_0 = bytes[8];
int green_1 = bytes[9];
codes[0 + 8] = green_0;
codes[1 + 8] = green_1;
codes[6 + 8] = 0.0f;
codes[7 + 8] = 1.0f;
// generate the midpoints
if(green_0 > green_1)
{
for( int i = 2; i < 8; ++i )
{
codes[i + 8] = ((8-i)*green_0 + (i-1)*green_1)/7;
}
}
else
{
for( int i = 2; i < 6; ++i )
{
codes[i + 8] = ((6-i)*green_0 + (i-1)*green_1)/5;
}
}
u8 indices[32];
for( int i = 0; i < 4; ++i )
{
u8 packed = bytes[2 + i];
u8* red_ind = indices + 4*i;
red_ind[0] = packed & 0x3;
red_ind[1] = ( packed >> 2 ) & 0x3;
red_ind[2] = ( packed >> 4 ) & 0x3;
red_ind[3] = ( packed >> 6 ) & 0x3;
packed = bytes[8 + i];
u8* green_ind = indices + 4*i + 16;
green_ind[0] = packed & 0x3;
green_ind[1] = ( packed >> 2 ) & 0x3;
green_ind[2] = ( packed >> 4 ) & 0x3;
green_ind[3] = ( packed >> 6 ) & 0x3;
}
// store out the colours
for( int i = 0; i < 16; ++i )
{
rgba[4*i] = codes[indices[i]];
rgba[4*i +1] = codes[indices[i + 16] + 8];
rgba[4*i +2] = 0;
rgba[4*i +3] = 255;
}
}
// -- GODOT end --
} // namespace squish