astcrt/range.h at main · typed/astcrt · GitHub

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#ifndef ASTC_RANGE_H_
#define ASTC_RANGE_H_

#ifdef RTTC_USE_ASTCRT

#include <cstdint>

/**
 * Define normalized (starting at zero) numeric ranges that can be represented
 * with 8 bits or less.
 */
enum range_t {
    RANGE_2,
    RANGE_3,
    RANGE_4,
    RANGE_5,
    RANGE_6,
    RANGE_8,
    RANGE_10,
    RANGE_12,
    RANGE_16,
    RANGE_20,
    RANGE_24,
    RANGE_32,
    RANGE_40,
    RANGE_48,
    RANGE_64,
    RANGE_80,
    RANGE_96,
    RANGE_128,
    RANGE_160,
    RANGE_192,
    RANGE_256,
    RANGE_MAX
};

/**
 * Table of maximum value for each range, minimum is always zero.
 */
const uint8_t range_max_table[RANGE_MAX] = {1,  2,  3,  4,   5,   7,   9,
                                            11, 15, 19, 23,  31,  39,  47,
                                            63, 79, 95, 127, 159, 191, 255};

#endif

#endif  // ASTC_RANGE_H_