Function max8

cmp_core/shaders/bc7_encode_kernel.cpp:463–466

    return a < b ? a : b;
}
CGU_UINT8 max8(CGU_UINT8 a, CGU_UINT8 b)
{
    return a > b ? a : b;
}

void pack_index(CGV_UINT32 packed_index[2], CGV_UINT8 src_index[MAX_SUBSET_SIZE])
{