    /********
     * File
     */
    /**
     * Open a file, for file modes see {@link FILE}. Files can only either be read or written, never both.Writing to a closed file throws an exception.
     * @class
     * @param {string} filename the name of the file.
     * @param {string} mode READ, WRITE or APPEND.
     */
    function File(filename, mode) { }
    /**
     * Read a single byte from file and return it as number.
     * @returns {number} the byte as a number or null for EOF.
     */
    File.prototype.ReadByte = function () { };
    /**
     * Write a single byte to a file.
     */
    File.prototype.WriteByte = function (ch) { };
    /**
     * Read a line of text from file. The maximum line length is 4096 byte.
     * @returns {string} the next line or null for EOF.
     */
    File.prototype.ReadLine = function () { };
    /**
     * Write a NEWLINE terminated string to a file.
     * @param {string} txt the string to write.
     */
    File.prototype.WriteLine = function (txt) { };
    /**
     * Write a string to a file.
     * @param {string} txt the string to write.
     */
    File.prototype.WriteString = function (txt) { };
    /**
     * Close the file.
     */
    File.prototype.Close = function () { };

    /********
     * Bitmap
     */
    /**
    * Load a BMP, TGA or PCX image.
    * @constructor
    * @param {string} filename name of the BMP or PNG file.
    *//**
    * create empty bitmap of given size.
    * @constructor
    * @param {number} width bitmap width.
    * @param {number} height bitmap width.
    *//**
    * create Bitmap from integer array.
    * @constructor
    * @param {number[]} data 32bit integer data interpreted as ARGB.
    * @param {number} width bitmap width.
    * @param {number} height bitmap height.
    *//*
    * create Bitmap from current (3dfx) screen.
    * @constructor
    * @param {number} x screen x position.
    * @param {number} y screen y position.
    * @param {number} width bitmap width.
    * @param {number} height bitmap height.
    * @param {GR_BUFFER} [buffer] one of FRONTBUFFER, BACKBUFFER or AUXBUFFER for 3dfx access, omit for normal screen acccess.
    */
    function Bitmap(filename) { };

    /**
     * Name of the file.
     */
    Bitmap.filename = null;
    /**
     * Width in pixels
     */
    Bitmap.width = null;
    /**
     * Height in pixels
     */
    Bitmap.height = null;

    /**
     * Draw the image to the canvas at given coordinates.
     * @param {number} x position to draw to.
     * @param {number} y position to draw to.
     */
    Bitmap.prototype.Draw = function (x, y) { };

    /**
     * Draw the image to the canvas at given coordinates.
     *
     * @param {number} srcX source position to draw from.
     * @param {number} srcY source position to draw from.
     * @param {number} srcW source size to draw from.
     * @param {number} srcH source size to draw from.
     * @param {number} destX position to draw to.
     * @param {number} destY position to draw to.
     * @param {number} destW size to draw.
     * @param {number} destH size to draw.
     */
    Bitmap.prototype.DrawAdvanced = function (srcX, srcY, srcW, srcH, destX, destY, destW, destH) { };

    /**
     * Draw the image to the canvas at given coordinates using the alpha channel transparency. Only works for 32bit TGA with alpha channel information.
     * @param {number} x position to draw to.
     * @param {number} y position to draw to.
     */
    Bitmap.prototype.DrawTrans = function (x, y) { };

    /**
     * Get the color of a pixel of this image.
     * @param {number} x position.
     * @param {number} y position.
     * @returns {number} the color of the pixel.
     */
    Bitmap.prototype.GetPixel = function (x, y) { };

    /**
     * draw the bitmap directly into the 3dfx/voodoo framebuffer (only works when fxInit() was called).
     *
     * @param {number} x position to draw to.
     * @param {number} y position to draw to.
     * @param {GR_BUFFER} buffer one of FRONTBUFFER, BACKBUFFER or AUXBUFFER
     * @param {boolean} pipeline true if the pixels shall be processed by the voodoos pixel pipeline, false to just draw.
     */
    Bitmap.prototype.FxDrawLfb = function (x, y, buffer, pipeline) { };

    /********
     * Font
     */
    /**
     * Load a '.FNT' file for GRX.
     * @class
     * @param {*} filename name of the font file.
     */
    function Font(filename) { }
    /**
     * Name of the FNT file.
     */
    Font.filename = null;
    /**
     * Font height
     */
    Font.height = null;
    /**
     * Draw a left aligned string to the canvas.
     * @param {number} x x position
     * @param {number} y y position.
     * @param {string} text the string to draw.
     * @param {Color} foreground foreground color.
     * @param {Color} background background color.
     */
    Font.prototype.DrawStringLeft = function (x, y, text, foreground, background) { };
    /**
     * Draw a center aligned string to the canvas.
     * @param {number} x x position
     * @param {number} y y position.
     * @param {string} text the string to draw.
     * @param {Color} foreground foreground color.
     * @param {Color} background background color.
     */
    Font.prototype.DrawStringCenter = function (x, y, text, foreground, background) { };
    /**
     * Draw a right aligned string to the canvas.
     * @param {number} x x position
     * @param {number} y y position.
     * @param {string} text the string to draw.
     * @param {Color} foreground foreground color.
     * @param {Color} background background color.
     */
    Font.prototype.DrawStringRight = function (x, y, text, foreground, background) { };
    /**
     * Calculate string width for this font.
     * @param {string} text the string to check.
     * @returns {number} the width in pixels.
     */
    Font.prototype.StringWidth = function (text) { };
    /**
     * Calculate string height for this font.
     * @param {string} text the string to check.
     * @returns {number} the height in pixels.
     */
    Font.prototype.StringHeight = function (text) { };

    /********
     * Sample/Module
     */
    /**
     * Load a WAV-file.
     * @class
     * @param {string} filename
     */
    function Sample(filename) { }
    /**
     * Name of the WAV.
     */
    Sample.filename = null;
    /**
     * Sound length.
     */
    Sample.length = null;
    /**
     * Sound frequency.
     */
    Sample.frequency = null;
    /**
     * Sound resolution.
     */
    Sample.bits = null;
    /**
     * mono/stereo indicator.
     */
    Sample.stereo = null;
    /**
     * Play the WAV.
     * @param {number} volume between 0-255.
     * @param {number} panning between (left) 0-255 (right).
     * @param {boolean} loop true := sample will loop, false := sample will only be played once.
     * @returns {number} used voice number or null if not played.
     */
    Sample.prototype.Play = function (volume, panning, loop) { };
    /**
     * Stop playing.
     */
    Sample.prototype.Stop = function () { };
    /**
     * Get sample data.
     * @param {number} sample index to return.
     * @returns {number} The sample value at that position. The sample data are always in unsigned format.
     */
    Sample.prototype.Get = function (idx) { };

    /********
     * MIDI
     */
    /**
     * Load a midi file.
     * @class
     * @param {string} filename the name of the MIDI file.
     */
    function Midi(filename) { }
    /**
     * Play the midi file.
     */
    Midi.prototype.Play = function () { };

    /********
     * ZBuffer
     */
    /**
     * Create a ZBuffer. A ZBuffer must be set as current before using it.
     * @class
     * @param {Bitmap} bitmap the bitmap to draw to or null for the screen.
     */
    function ZBuffer(bitmap) { }
    /**
     * Clear ZBuffer with given value.
     * @param {number} z value to use for clearing.
     */
    ZBuffer.prototype.Clear = function (z) { };
    /**
     * Set this ZBuffer as current.
     */
    ZBuffer.prototype.Set = function () { };

    /********
     * TexInfo
     */
    /**
     * create new texture from 3df file or a Bitmap.
     * @class
     * @param {(string|Bitmap)} src 3df file to load as texture or Bitmap to convert to texture
     */
    function TexInfo(src) { }

    /**
     * filename
     */
    TexInfo.filename = null;
    /**
     * large LOD
     */
    TexInfo.largeLod = null;
    /**
     * small LOD
     */
    TexInfo.smallLod = null;
    /**
     * aspect ratio
     */
    TexInfo.aspectRatio = null;
    /**
     * texture format
     */
    TexInfo.format = null;
    /**
     * table type
     */
    TexInfo.tableType = null;
    /**
     * size of texture
     */
    TexInfo.textureSize = null;
    /**
     * texture mem address (if downloaded)
     */
    TexInfo.address = null;
    /**
     * TMU (if downloaded)
     */
    TexInfo.tmu = null;

    /**
     * download the MIP map to texture memory.
     * @param {GR_TMU} tmu the TMU unit to download to.
     * @param {number} address destination memory address in texture memory.
     * @param {GR_MIPMAPLEVELMASK} evenOdd one of GR_MIPMAPLEVELMASK.
     */
    TexInfo.prototype.DownloadMipMap = function (tmu, address, evenOdd) { };

    /**
     * mark the texture as 'not downloaded' again.
     */
    TexInfo.prototype.MarkUnused = function () { };

    /**
     * specify this TexInfo as the current texture source for rendering.
     * @param {GR_MIPMAPLEVELMASK} evenOdd one of GR_MIPMAPLEVELMASK.
     */
    TexInfo.prototype.Source = function (evenOdd) { };

    /**
     * return the texture memory consumed by a texture
     * @param {GR_MIPMAPLEVELMASK} evenOdd one of GR_MIPMAPLEVELMASK.
     * @returns {number} size of texture in bytes.
     */
    TexInfo.prototype.MemRequired = function (evenOdd) { };

    /********
     * FxState
     */
    /**
     * save current glide state into this object.
     */
    function FxState() { }

    /**
     * restore glide state from this object.
     */
    FxState.prototype.Set = function () { }