convert method

dynamic convert(int p, [ int? encoding ])

Implementation

dynamic convert(int p, [int? encoding]) {
  dynamic extension;

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

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

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

    extension = extensions.get('OES_texture_half_float');

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

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

  if (p == RGBFormat) {
    console.warning('WebGLRenderer: RGBFormat has been removed. Use RGBAFormat instead. https://github.com/mrdoob/three.js/pull/23228');
    return WebGL.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 WebGL.RED_INTEGER;
  if (p == RGFormat) return WebGL.RG;
  if (p == RGIntegerFormat) return WebGL.RG_INTEGER;
  if (p == RGBAIntegerFormat) return WebGL.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 WebGL.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 null;//(gl[p] != null) ? gl[p] : null;
}