convert method

dynamic convert(dynamic p, [ dynamic encoding ])

Implementation

convert(p, [encoding]) {
  var extension;

  if (p == UnsignedByteType) return gl.UNSIGNED_BYTE;
  if (p == UnsignedShort4444Type) return gl.UNSIGNED_SHORT_4_4_4_4;
  if (p == UnsignedShort5551Type) return gl.UNSIGNED_SHORT_5_5_5_1;

  if (p == ByteType) return gl.BYTE;
  if (p == ShortType) return gl.SHORT;
  if (p == UnsignedShortType) return gl.UNSIGNED_SHORT;
  if (p == IntType) return gl.INT;
  if (p == UnsignedIntType) return gl.UNSIGNED_INT;
  if (p == FloatType) return gl.FLOAT;

  if (p == HalfFloatType) {
    if (isWebGL2) return gl.HALF_FLOAT;

    extension = extensions.get('OES_texture_half_float');

    if (extension != null) {
      return extension.HALF_FLOAT_OES;
    } else {
      return null;
    }
  }

  if (p == AlphaFormat) return gl.ALPHA;
  if (p == RGBAFormat) return gl.RGBA;
  if (p == LuminanceFormat) return gl.LUMINANCE;
  if (p == LuminanceAlphaFormat) return gl.LUMINANCE_ALPHA;
  if (p == DepthFormat) return gl.DEPTH_COMPONENT;
  if (p == DepthStencilFormat) return gl.DEPTH_STENCIL;
  if (p == RedFormat) return gl.RED;

  if (p == RGBFormat) {
    console.warn(
        'THREE.WebGLRenderer: THREE.RGBFormat has been removed. Use THREE.RGBAFormat instead. https://github.com/mrdoob/three.js/pull/23228');
    return gl.RGBA;
  }

  // WebGL 1 sRGB fallback

  if (p == SRGBAFormat) {
    extension = extensions.get('EXT_sRGB');

    if (extension != null) {
      return extension.SRGB_ALPHA_EXT;
    } else {
      return null;
    }
  }

  // WebGL2 formats.

  if (p == RedIntegerFormat) return gl.RED_INTEGER;
  if (p == RGFormat) return gl.RG;
  if (p == RGIntegerFormat) return gl.RG_INTEGER;
  if (p == RGBAIntegerFormat) return gl.RGBA_INTEGER;

  // S3TC

  if (p == RGB_S3TC_DXT1_Format ||
      p == RGBA_S3TC_DXT1_Format ||
      p == RGBA_S3TC_DXT3_Format ||
      p == RGBA_S3TC_DXT5_Format) {
    if (encoding == sRGBEncoding) {
      extension = extensions.get('WEBGL_compressed_texture_s3tc_srgb');

      if (extension != null) {
        if (p == RGB_S3TC_DXT1_Format) {
          return extension.COMPRESSED_SRGB_S3TC_DXT1_EXT;
        }
        if (p == RGBA_S3TC_DXT1_Format) {
          return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
        }
        if (p == RGBA_S3TC_DXT3_Format) {
          return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
        }
        if (p == RGBA_S3TC_DXT5_Format) {
          return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
        }
      } else {
        return null;
      }
    } else {
      extension = extensions.get('WEBGL_compressed_texture_s3tc');

      if (extension != null) {
        if (p == RGB_S3TC_DXT1_Format) {
          return extension.COMPRESSED_RGB_S3TC_DXT1_EXT;
        }
        if (p == RGBA_S3TC_DXT1_Format) {
          return extension.COMPRESSED_RGBA_S3TC_DXT1_EXT;
        }
        if (p == RGBA_S3TC_DXT3_Format) {
          return extension.COMPRESSED_RGBA_S3TC_DXT3_EXT;
        }
        if (p == RGBA_S3TC_DXT5_Format) {
          return extension.COMPRESSED_RGBA_S3TC_DXT5_EXT;
        }
      } else {
        return null;
      }
    }
  }

  // PVRTC

  if (p == RGB_PVRTC_4BPPV1_Format ||
      p == RGB_PVRTC_2BPPV1_Format ||
      p == RGBA_PVRTC_4BPPV1_Format ||
      p == RGBA_PVRTC_2BPPV1_Format) {
    extension = extensions.get('WEBGL_compressed_texture_pvrtc');

    if (extension != null) {
      if (p == RGB_PVRTC_4BPPV1_Format) {
        return extension.COMPRESSED_RGB_PVRTC_4BPPV1_IMG;
      }
      if (p == RGB_PVRTC_2BPPV1_Format) {
        return extension.COMPRESSED_RGB_PVRTC_2BPPV1_IMG;
      }
      if (p == RGBA_PVRTC_4BPPV1_Format) {
        return extension.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG;
      }
      if (p == RGBA_PVRTC_2BPPV1_Format) {
        return extension.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;
      }
    } else {
      return null;
    }
  }

  // ETC1

  if (p == RGB_ETC1_Format) {
    extension = extensions.get('WEBGL_compressed_texture_etc1');

    if (extension != null) {
      return extension.COMPRESSED_RGB_ETC1_WEBGL;
    } else {
      return null;
    }
  }

  // ETC2

  if (p == RGB_ETC2_Format || p == RGBA_ETC2_EAC_Format) {
    extension = extensions.get('WEBGL_compressed_texture_etc');

    if (extension != null) {
      if (p == RGB_ETC2_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ETC2
            : extension.COMPRESSED_RGB8_ETC2;
      }
      if (p == RGBA_ETC2_EAC_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
            : extension.COMPRESSED_RGBA8_ETC2_EAC;
      }
    } else {
      return null;
    }
  }

  // ASTC

  if (p == RGBA_ASTC_4x4_Format ||
      p == RGBA_ASTC_5x4_Format ||
      p == RGBA_ASTC_5x5_Format ||
      p == RGBA_ASTC_6x5_Format ||
      p == RGBA_ASTC_6x6_Format ||
      p == RGBA_ASTC_8x5_Format ||
      p == RGBA_ASTC_8x6_Format ||
      p == RGBA_ASTC_8x8_Format ||
      p == RGBA_ASTC_10x5_Format ||
      p == RGBA_ASTC_10x6_Format ||
      p == RGBA_ASTC_10x8_Format ||
      p == RGBA_ASTC_10x10_Format ||
      p == RGBA_ASTC_12x10_Format ||
      p == RGBA_ASTC_12x12_Format) {
    extension = extensions.get('WEBGL_compressed_texture_astc');

    if (extension != null) {
      if (p == RGBA_ASTC_4x4_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR
            : extension.COMPRESSED_RGBA_ASTC_4x4_KHR;
      }
      if (p == RGBA_ASTC_5x4_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR
            : extension.COMPRESSED_RGBA_ASTC_5x4_KHR;
      }
      if (p == RGBA_ASTC_5x5_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR
            : extension.COMPRESSED_RGBA_ASTC_5x5_KHR;
      }
      if (p == RGBA_ASTC_6x5_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR
            : extension.COMPRESSED_RGBA_ASTC_6x5_KHR;
      }
      if (p == RGBA_ASTC_6x6_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR
            : extension.COMPRESSED_RGBA_ASTC_6x6_KHR;
      }
      if (p == RGBA_ASTC_8x5_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR
            : extension.COMPRESSED_RGBA_ASTC_8x5_KHR;
      }
      if (p == RGBA_ASTC_8x6_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR
            : extension.COMPRESSED_RGBA_ASTC_8x6_KHR;
      }
      if (p == RGBA_ASTC_8x8_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR
            : extension.COMPRESSED_RGBA_ASTC_8x8_KHR;
      }
      if (p == RGBA_ASTC_10x5_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR
            : extension.COMPRESSED_RGBA_ASTC_10x5_KHR;
      }
      if (p == RGBA_ASTC_10x6_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR
            : extension.COMPRESSED_RGBA_ASTC_10x6_KHR;
      }
      if (p == RGBA_ASTC_10x8_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR
            : extension.COMPRESSED_RGBA_ASTC_10x8_KHR;
      }
      if (p == RGBA_ASTC_10x10_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR
            : extension.COMPRESSED_RGBA_ASTC_10x10_KHR;
      }
      if (p == RGBA_ASTC_12x10_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR
            : extension.COMPRESSED_RGBA_ASTC_12x10_KHR;
      }
      if (p == RGBA_ASTC_12x12_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR
            : extension.COMPRESSED_RGBA_ASTC_12x12_KHR;
      }
    } else {
      return null;
    }
  }

  // BPTC

  if (p == RGBA_BPTC_Format) {
    extension = extensions.get('EXT_texture_compression_bptc');

    if (extension != null) {
      if (p == RGBA_BPTC_Format) {
        return (encoding == sRGBEncoding)
            ? extension.COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT
            : extension.COMPRESSED_RGBA_BPTC_UNORM_EXT;
      }
    } else {
      return null;
    }
  }

  //

  if (p == UnsignedInt248Type) {
    if (isWebGL2) return gl.UNSIGNED_INT_24_8;

    extension = extensions.get('WEBGL_depth_texture');

    if (extension != null) {
      return extension.UNSIGNED_INT_24_8_WEBGL;
    } else {
      return null;
    }
  }

  // if "p" can't be resolved, assume the user defines a WebGL constant as a string (fallback/workaround for packed RGB formats)

		return ( gl[ p ] != null ) ? gl[ p ] : null;
}