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Fix 32 bit NEON version of DXT1 compression.

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This reverts commit b32e8fa24e.

Apparently it is possible to receive non-uniform data in alpha channel, which
breaks the original assumption about not needing the mask. This seemed to be a
problem only on 32 bit NEON implementation of DXT1 compression. Other
implementations handle such data without degradation of visual output.
This commit is contained in:
Bartosz Taudul 2019-09-03 21:26:17 +02:00
parent aa2530d442
commit 37661fd2ee
2 changed files with 5 additions and 4 deletions
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9
client/TracyDxt1.cpp
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@ -372,10 +372,11 @@ static tracy_force_inline uint64_t ProcessRGB( const uint8_t* src )
return uint64_t( to565( src[0], src[1], src[2] ) ) << 16;
}
uint8x16_t l0 = vreinterpretq_u8_u32( px0 );
uint8x16_t l1 = vreinterpretq_u8_u32( px1 );
uint8x16_t l2 = vreinterpretq_u8_u32( px2 );
uint8x16_t l3 = vreinterpretq_u8_u32( px3 );
uint32x4_t mask = vdupq_n_u32( 0xFFFFFF );
uint8x16_t l0 = vreinterpretq_u8_u32( vandq_u32( mask, px0 ) );
uint8x16_t l1 = vreinterpretq_u8_u32( vandq_u32( mask, px1 ) );
uint8x16_t l2 = vreinterpretq_u8_u32( vandq_u32( mask, px2 ) );
uint8x16_t l3 = vreinterpretq_u8_u32( vandq_u32( mask, px3 ) );
uint8x16_t min0 = vminq_u8( l0, l1 );
uint8x16_t min1 = vminq_u8( l2, l3 );

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