Function parseMipMapFromObject

lib/texture.js:918–967

(mipmap, options)

  }

  function parseMipMapFromObject (mipmap, options) {
    var imgData = null
    if (isPixelData(options)) {
      imgData = mipmap.images[0] = allocImage()
      copyFlags(imgData, mipmap)
      parseImage(imgData, options)
      mipmap.mipmask = 1
    } else {
      parseFlags(mipmap, options)
      if (Array.isArray(options.mipmap)) {
        var mipData = options.mipmap
        for (var i = 0; i < mipData.length; ++i) {
          imgData = mipmap.images[i] = allocImage()
          copyFlags(imgData, mipmap)
          imgData.width >>= i
          imgData.height >>= i
          parseImage(imgData, mipData[i])
          mipmap.mipmask |= (1 << i)
        }
      } else {
        imgData = mipmap.images[0] = allocImage()
        copyFlags(imgData, mipmap)
        parseImage(imgData, options)
        mipmap.mipmask = 1
      }
    }
    copyFlags(mipmap, mipmap.images[0])

    // For textures of the compressed format WEBGL_compressed_texture_s3tc
    // we must have that
    //
    // "When level equals zero width and height must be a multiple of 4.
    // When level is greater than 0 width and height must be 0, 1, 2 or a multiple of 4. "
    //
    // but we do not yet support having multiple mipmap levels for compressed textures,
    // so we only test for level zero.

    if (
      mipmap.compressed &&
      (
        mipmap.internalformat === GL_COMPRESSED_RGB_S3TC_DXT1_EXT ||
        mipmap.internalformat === GL_COMPRESSED_RGBA_S3TC_DXT1_EXT ||
        mipmap.internalformat === GL_COMPRESSED_RGBA_S3TC_DXT3_EXT ||
        mipmap.internalformat === GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
      )
    ) {
      check(mipmap.width % 4 === 0 && mipmap.height % 4 === 0,
        'for compressed texture formats, mipmap level 0 must have width and height that are a multiple of 4')
    }
  }

  function setMipMap (mipmap, target) {
    var images = mipmap.images