Function convertToRGBA32Float

Source/Falcor/Utils/Image/Bitmap.cpp:163–206

* Converts an image of the given format to an RGBA float image. */

 * Converts an image of the given format to an RGBA float image.
 */
static std::vector<float> convertToRGBA32Float(ResourceFormat format, uint32_t width, uint32_t height, const void* pData)
{
    FALCOR_ASSERT(isConvertibleToRGBA32Float(format));

    FormatType type = getFormatType(format);
    uint32_t channelCount = getFormatChannelCount(format);
    uint32_t channelBits = getNumChannelBits(format, 0);

    std::vector<float> floatData;

    if (type == FormatType::Float && channelBits == 16)
    {
        floatData = convertHalfToRGBA32Float(width, height, channelCount, pData);
    }
    else if (type == FormatType::Uint && channelBits == 16)
    {
        floatData = convertIntToRGBA32Float<uint16_t>(width, height, channelCount, pData);
    }
    else if (type == FormatType::Uint && channelBits == 32)
    {
        floatData = convertIntToRGBA32Float<uint32_t>(width, height, channelCount, pData);
    }
    else if (type == FormatType::Sint && channelBits == 16)
    {
        floatData = convertIntToRGBA32Float<int16_t>(width, height, channelCount, pData);
    }
    else if (type == FormatType::Sint && channelBits == 32)
    {
        floatData = convertIntToRGBA32Float<int32_t>(width, height, channelCount, pData);
    }
    else
    {
        FALCOR_UNREACHABLE();
    }

    // Default alpha channel to 1.
    if (channelCount < 4)
    {
        for (uint32_t i = 0; i < width * height; ++i)
            floatData[i * 4 + 3] = 1.f;
    }

    return floatData;
}

/**
 * Converts 96bpp to 128bpp RGBA without clamping.