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DXT1 SIMD color index table generator.

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This commit is contained in:
Bartosz Taudul 2019-06-28 21:57:38 +02:00
parent 3208d6c803
commit d593e5dfa9
1 changed files with 36 additions and 0 deletions
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extra/dxt1table.c Normal file
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#include <stdint.h>
#include <stdio.h>
static const uint8_t IndexTable[4] = { 1, 3, 2, 0 };
int convert( int v )
{
int v0 = v & 0x3;
int v1 = ( v >> 2 ) & 0x3;
int v2 = ( v >> 4 ) & 0x3;
int v3 = ( v >> 6 );
int t0 = IndexTable[v0];
int t1 = IndexTable[v1];
int t2 = IndexTable[v2];
int t3 = IndexTable[v3];
return t0 | ( t1 << 2 ) | ( t2 << 4 ) | ( t3 << 6 );
}
int main()
{
for( int i=0; i<256; i++ )
{
if( i % 16 == 15 )
{
printf( "%i,\n", convert( i ) );
}
else
{
printf( "%i,\t", convert( i ) );
}
}
printf( "\n" );
return 0;
}