reverse_bits.hpp

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#pragma once
 
#include <cstdint>
 
namespace porytiles {
 
constexpr uint8_t reverse_bits(uint8_t b)
{
    b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
    b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
    b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
    return b;
}
 
} // namespace porytiles