Function GetTargetFrame

src/openrct2/ride/Vehicle.Animation.cpp:903–913

* Get the frame of animation for the current animationState based on animation speed and animation frames */

 * Get the frame of animation for the current animationState based on animation speed and animation frames
 */
static uint8_t GetTargetFrame(const CarEntry& carEntry, uint32_t animationState)
{
    if (carEntry.AnimationSpeed == 0)
        return 0;
    auto targetFrame = animationState / (carEntry.AnimationSpeed << 2);
    // mask of 0xFF
    targetFrame &= std::numeric_limits<uint8_t>::max();
    // multiply by number of frames. After the bitshift 8, the range will be 0 to AnimationFrames - 1
    targetFrame *= carEntry.AnimationFrames;
    return targetFrame >> std::numeric_limits<uint8_t>::digits;
}

/**
 * Compute the position that steam should be spawned