system;

{This file contains functions that are external}

type

    uinteger = uinteger;

    Integer = integer;

    LongInt = integer;

    LongWord = uinteger;

    Cardinal = uinteger;

    PtrInt = integer;

    Word = uinteger;

    Byte = integer;

    SmallInt = integer;

    ShortInt = integer;

    Int64 = integer;

    QWord = uinteger;

    GLint = integer;

    GLuint = integer;

    GLenum = integer;

    int = integer;

    size_t = integer;

    pointer = pointer;

    float = float;

    single = float;

    double = float;

    real = float;

    extended = float;

    GLfloat = float;

    boolean = boolean;

    LongBool = boolean;

    string = string;

    shortstring = string;

    ansistring = string;

    widechar = string;

    char = char;

    PChar = ^char;

    PPChar = ^Pchar;

    PByte = ^Byte;

    PWord = ^Word;

    PLongInt = ^LongInt;

    PLongWord = ^LongWord;

    PInteger = ^Integer;

    Handle = integer;

    png_structp = pointer;

    png_size_t = integer;

var

    false, true: boolean;

    ord, Succ, Pred : function : integer;

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

    IOResult : integer;

    exit, break, halt, continue : procedure;

    TextFile, File : Handle;

    FileMode : integer;

    exitcode : integer;

    stdout, stderr : Handle;

    sqrt, cos, sin: function : float;

    pi : float;

    sizeof : function : integer;

    glGetString : function : pchar;

    glBegin, glBindTexture, glBlendFunc, glClear, glClearColor,

    glColor4ub, glColorMask, glColorPointer, glDeleteTextures,

    glDisable, glDisableClientState, glDrawArrays, glEnable,

    glEnableClientState, glEnd, glGenTextures, glGetIntegerv,

    glHint, glLineWidth, glLoadIdentity, glMatrixMode, glPopMatrix,

    glPushMatrix, glReadPixels, glRotatef, glScalef, glTexCoord2f,

    glTexCoordPointer, glTexImage2D, glTexParameterf,

    glTexParameteri, glTranslatef, glVertex2d, glVertexPointer,

    glViewport, glext_LoadExtension, glDeleteRenderbuffersEXT,

    glDeleteFramebuffersEXT, glGenFramebuffersEXT,

    glGenRenderbuffersEXT, glBindFramebufferEXT,

    glBindRenderbufferEXT, glRenderbufferStorageEXT,

    glFramebufferRenderbufferEXT, glFramebufferTexture2DEXT,

    glUniformMatrix4fv, glVertexAttribPointer, glCreateShader,

    glShaderSource, glCompileShader, glGetShaderiv, glGetShaderInfoLog,

    glCreateProgram, glAttachShader, glBindAttribLocation, glLinkProgram,

    glDeleteShader, glGetProgramiv, glGetProgramInfoLog, glUseProgram,

    glUniform1i, glGetUniformLocation, glEnableVertexAttribArray,

    glGetError, glDeleteProgram, glDeleteBuffers,

    glGenBuffers, glBufferData, glBindBuffer, glewInit,

    glUniform4f, glDisableVertexAttribArray, glTexEnvi : procedure;

    GL_BGRA, GL_BLEND, GL_CLAMP_TO_EDGE, GL_COLOR_ARRAY,

    GL_COLOR_BUFFER_BIT, GL_DEPTH_BUFFER_BIT, GL_DEPTH_COMPONENT,

    GL_DITHER, GL_EXTENSIONS, GL_FALSE, GL_FASTEST, GL_LINEAR,

    GL_LINE_LOOP, GL_LINES, GL_LINE_SMOOTH, GL_LINE_STRIP,

    GL_MAX_TEXTURE_SIZE, GL_MODELVIEW, GL_ONE_MINUS_SRC_ALPHA,

    GL_PERSPECTIVE_CORRECTION_HINT, GL_PROJECTION, GL_QUADS,

    GL_RENDERER, GL_RGBA, GL_RGBA8, GL_SRC_ALPHA, GL_TEXTURE_2D,

    GL_TEXTURE_COORD_ARRAY, GL_TEXTURE_MAG_FILTER,

    GL_TEXTURE_MIN_FILTER, GL_TEXTURE_PRIORITY, GL_TEXTURE_WRAP_S,

    GL_TEXTURE_WRAP_T, GL_TRIANGLE_FAN, GL_TRUE, GL_VENDOR,

    GL_VERSION, GL_VERTEX_ARRAY, GLenum,  GL_FRAMEBUFFER_EXT,

    GL_RENDERBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,

    GL_COLOR_ATTACHMENT0_EXT, GL_FLOAT, GL_UNSIGNED_BYTE, GL_COMPILE_STATUS,

    GL_INFO_LOG_LENGTH, GL_LINK_STATUS, GL_VERTEX_SHADER, GL_FRAGMENT_SHADER,

    GL_NO_ERROR, GL_ARRAY_BUFFER, GL_STATIC_DRAW, GLEW_OK,

    GL_AUX_BUFFERS, GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE, GL_ADD: integer;

    TThreadId : function : integer;

    _strconcat, _strappend, _strprepend, _chrconcat : function : string;

    _strcompare, _strncompare, _strcomparec : 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;

    clear_filelist_hook, add_file_hook, idb_loader_hook, mainloop_hook, drawworld_hook : procedure;

    SDL_InitPatch : procedure;

    PHYSFS_init, PHYSFS_deinit, PHYSFS_mount, PHYSFS_readBytes : function : LongInt;

    PHYSFSRWOPS_openRead, PHYSFSRWOPS_openWrite, PHYSFS_openRead : function : pointer;

    PHYSFS_eof, PHYSFS_close, PHYSFS_exists : function : boolean;

    hedgewarsMountPackages, physfsReaderSetBuffer, hedgewarsMountPackage : procedure;

    physfsReader : function : pointer;