export function assignGpuChannel()

in src/utils/gpu-filter-utils.js [68:116]

• 38 lines of code
• 12 McCabe index (conditional complexity)

export function assignGpuChannel(filter, filters) {
  // find first available channel
  if (!filter.gpu) {
    return filter;
  }

  const gpuChannel = filter.gpuChannel || [];

  filter.dataId.forEach((dataId, datasetIdx) => {
    const findGpuChannel = channel => f => {
      const dataIdx = toArray(f.dataId).indexOf(dataId);
      return (
        f.id !== filter.id && dataIdx > -1 && f.gpu && toArray(f.gpuChannel)[dataIdx] === channel
      );
    };

    if (
      Number.isFinite(gpuChannel[datasetIdx]) &&
      !filters.find(findGpuChannel(gpuChannel[datasetIdx]))
    ) {
      // if value is already assigned and valid
      return;
    }

    let i = 0;

    while (i < MAX_GPU_FILTERS) {
      if (!filters.find(findGpuChannel(i))) {
        gpuChannel[datasetIdx] = i;
        return;
      }
      i++;
    }
  });

  // if cannot find channel for all dataid, set gpu back to false
  // TODO: refactor filter to handle same filter different gpu mode
  if (!gpuChannel.length || !gpuChannel.every(Number.isFinite)) {
    return {
      ...filter,
      gpu: false
    };
  }

  return {
    ...filter,
    gpuChannel
  };
}