int logsinTable[256];
    int expTable[256];

    void initTables() {
        for (int i = 0; i < 256; ++i) {
            logsinTable[i] = round(-log2(sin((i + 0.5) * M_PI_2 / 256.0)) * 256.0);
            expTable[i] = round(exp2(i / 256.0) * 1024.0) - 1024;
        }
    }

    int lookupSin(int val) {
        bool sign   = val & 512;
        bool mirror = val & 256;
        val &= 255;
        int result = logsinTable[mirror ? val ^ 255 : val];
        if (sign) result |= 0x8000;
        return result;
    }

    int lookupExp(int val) {
        bool sign = val & 0x8000;
        int t = (expTable[(val & 255) ^ 255] | 1024) << 1;
        int result = t >> ((val & 0x7F00) >> 8);
        if (sign) result = ~result;
        return result >> 4;
    }