Function MapToF16

cmp_compressonatorlib/bc6h/bc6h_encode.cpp:1488–1529

#endif

static float MapToF16(float f, bool isSigned)
{
    const float normalization = 1.0;  // For future use

    float result = 0.0f;

    // negative infinity for signed formats
    if (isSigned && cmp_isinf(f) && f < 0.0f)
    {
        result = F16_MAX_NEGATIVE_BITS;
    }
    // positive infinity
    else if (cmp_isinf(f) && f > 0.0f)
    {
        result = F16_MAX_BITS;
    }
    // NaN, or negative infinity for non-signed formats
    else if (cmp_isnan(f) || cmp_isinf(f))
    {
        result = 0.0f;
    }
    // signed number is very close to zero
    else if (isSigned && f > -0.00001f && f < 0.00001f)
    {
        result = 0.0f;
    }
    // non-signed number is negative or very close to zero
    else if (!isSigned && f < 0.00001f)
    {
        result = 0.0f;
    }
    else if (isSigned && f < 0.0f)
    {
        result = -CMP_HALF(abs(f / normalization)).bits();
    }
    else
    {
        result = CMP_HALF(f / normalization).bits();
    }

    return result;
}

float BC6HBlockEncoder::CompressBlock(float in[MAX_SUBSET_SIZE][MAX_DIMENSION_BIG], BYTE out[COMPRESSED_BLOCK_SIZE])
{