Function uploadEntryLut

packages/core/src/runtime/colorGrading.ts:477–519

(
  entry: ColorGradingEntry,
  src: string,
  lut: CubeLut3D,
)

}

function uploadEntryLut(
  entry: ColorGradingEntry,
  src: string,
  lut: CubeLut3D,
): RuntimeLutTexture | null {
  if (entry.lut?.src === src) return entry.lut;
  const packed = packCubeLutToRgba8(lut);
  const { gl, program } = entry;
  try {
    gl.activeTexture(gl.TEXTURE1);
    gl.bindTexture(gl.TEXTURE_2D, program.lutTexture);
    gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
    gl.texImage2D(
      gl.TEXTURE_2D,
      0,
      gl.RGBA,
      packed.width,
      packed.height,
      0,
      gl.RGBA,
      gl.UNSIGNED_BYTE,
      packed.data,
    );
    entry.lut = {
      src,
      title: lut.title,
      size: lut.size,
      domainMin: lut.domainMin,
      domainMax: lut.domainMax,
      textureWidth: packed.width,
      textureHeight: packed.height,
    };
    entry.lutError = null;
    entry.lutLoadingSrc = null;
    return entry.lut;
  } catch (err) {
    entry.lut = null;
    entry.lutError = errorMessage(err);
    entry.lutLoadingSrc = null;
    swallow("runtime.colorGrading.uploadLut", err);
    return null;
  }
}

// fallow-ignore-next-line complexity
function ensureEntryLut(entry: ColorGradingEntry): RuntimeLutTexture | null {