system;

type 

    Integer = integer;

    LongInt = integer;

    LongWord = integer;

    Cardinal = integer;

    PtrInt = integer;

    Word = integer;

    Byte = integer;

    SmallInt = integer;

    ShortInt = integer;

    QWord = integer;

    GLint = integer;

    GLuint = integer;

    gl_unsigned_byte = integer;

    Int = integer;

    pointer = pointer;

    float = float;

    single = float;

    double = float;

    real = float;

    extended = float;

    GLfloat = float;

    gl_float = float;

    boolean = boolean;

    LongBool = boolean;

    string = string;

    shortstring = string;

    ansistring = string;

    widechar = string;

    char = char;

    PChar = ^char;

    PByte = ^Byte;

    PLongInt = ^LongInt;

    PLongWord = ^LongWord;

    PInteger = ^Integer;

    Handle = integer;

    stderr = Handle;

    png_structp = pointer;

    png_size_t = integer;

var 

    false, true: boolean;

    write, writeLn, read, readLn: procedure;

    StrLen, ord, Succ, Pred : function : integer;

    inc, dec, Low, High, Lo, Hi : function : integer;

    odd, even : function : boolean;

    Now : function : integer;

    new, dispose, FillChar, Move : procedure;

    trunc, round : function : integer;

    Abs, Sqr : function : integer;

    StrPas, FormatDateTime, copy, delete, str, pos, trim : function : shortstring;

    Length, StrToInt : function : integer;

    SetLength, val : procedure;

    assign, rewrite, reset, flush, BlockWrite, BlockRead, close : procedure;

    IOResult : function : integer;

    exit, break, halt, continue : procedure;

    TextFile, file : Handle;

    FileMode : integer;

    FileExists, DirectoryExists, eof : function : boolean;

    ExtractFileName : function : string;

    exitcode : integer;

    ParamCount : function : integer;

    ParamStr : function : string;

    sqrt, arctan2, pi, cos, sin, power : function : float;

    TypeInfo, GetEnumName : function : shortstring;

    UTF8ToUnicode, WrapText: function : shortstring;

    sizeof : function : integer;

    GetMem : function : pointer;

    FreeMem : procedure;

    gl_texture_2d, glbindtexture, gltexparameterf, gl_rgba, 

    glteximage2d, glvertexpointer, gltexcoordpointer,

    gl_triangle_fan, gldrawarrays, glpushmatrix, glpopmatrix,

    gltranslatef, glscalef, glrotatef, gldisable, glenable,

    gl_line_smooth, gllinewidth, gl_lines, gl_line_loop,

    glcolor4ub, gl_texture_wrap_s, gltexparameteri,

    gl_texture_wrap_t, gl_texture_min_filter,

    gl_linear, gl_texture_mag_filter, glgentextures,

    gldeletetextures, glreadpixels, glclearcolor,

    gl_line_strip, gldeleterenderbuffersext,

    gldeleteframebuffersext, glext_loadextension,

    gl_max_texture_size, glgetintegerv, gl_renderer,

    glgetstring, gl_vendor, gl_version, glgenframebuffersext,

    glbindframebufferext, glgenrenderbuffersext,

    glbindrenderbufferext, glrenderbufferstorageext,

    glframebufferrenderbufferext, glframebuffertexture2dext,

    gl_framebuffer_ext, gl_depth_component, 

    gl_depth_attachment_ext, gl_renderbuffer_ext, gl_rgba8,

    gl_color_attachment0_ext, gl_modelview, gl_blend,

    gl_src_alpha, gl_one_minus_src_alpha,  

    gl_perspective_correction_hint, gl_fastest,

    gl_dither, gl_vertex_array, gl_texture_coord_array,

    glviewport, glloadidentity, glmatrixmode, glhint,

    glblendfunc, glenableclientstate, gl_color_buffer_bit,

    glclear, gldisableclientstate, gl_color_array,

    glcolorpointer, gl_depth_buffer_bit, gl_quads,

    glbegin, glend, gltexcoord2f, glvertex2d,

    gl_true, gl_false, glcolormask, gl_projection,

    gl_texture_priority, glenum, gl_clamp_to_edge,

    gl_extensions : procedure;

    TThreadId : function : integer;

    BeginThread, ThreadSwitch : procedure;

    InterlockedIncrement, InterlockedDecrement : procedure;

    random : function : integer;

    randomize : procedure;

    Assigned : function : boolean;

    _strconcat : function : string;

    _strcompare, _strncompare : function : boolean;

    png_structp, png_set_write_fn, png_get_io_ptr,

    png_get_libpng_ver, png_create_write_struct,

    png_create_info_struct, png_destroy_write_struct,

    png_write_row, png_set_ihdr, png_write_info,

    png_write_end : procedure;