freepascal.compiler/packages/opengl/build/glut_linux.tem

{
  $Id$

  Translation of the Mesa GLUT headers for FreePascal
  Linux Version, Copyright (C) 1999 Sebastian Guenther


  Mesa 3-D graphics library
  Version:  3.0
  Copyright (C) 1995-1998  Brian Paul

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public
  License along with this library; if not, write to the Free
  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
}

{$MODE delphi}

unit GLUT;

interface

{$MACRO ON}

{$IFDEF Linux}
  {$DEFINE gldecl := cdecl;}
  {$DEFINE extdecl := cdecl;}
  uses GL;
{$ELSE}
  {$MESSAGE Unsupported platform.}
{$ENDIF}


function InitGLUTFromLibrary(libname: PChar): Boolean;

// determines automatically which library to use:
function InitGLUT: Boolean;


var
  GLUTDumpUnresolvedFunctions,
  GLUTInitialized: Boolean;


%GLUTDeclsIF

var
%GLUTProcsPD


implementation

{$LINKLIB Xmu}

function dlopen(AFile: PChar; mode: LongInt): Pointer; external 'dl';
function dlclose(handle: Pointer): LongInt; external 'dl';
function dlsym(handle: Pointer; name: PChar): Pointer; external 'dl';

function LoadLibrary(name: PChar): Pointer;
begin
  Result := dlopen(name, $101 {RTLD_GLOBAL or RTLD_LAZY});
end;

function GetProc(handle: Pointer; name: PChar): Pointer;
begin
  Result := dlsym(handle, name);
  if (Result = nil) and GLUTDumpUnresolvedFunctions then
    WriteLn('Unresolved: ', name);
end;

var
  libGLUT: Pointer;

function InitGLUTFromLibrary(libname: PChar): Boolean;
begin
  Result := False;
  libGLUT := LoadLibrary(libname);
  if not Assigned(libGLUT) then exit;

%GLUTProcsPL

  GLUTInitialized := True;
  Result := True;
end;


function InitGLUT: Boolean;
begin
  Result := InitGLUTFromLibrary('libglut.so') or
            InitGLUTFromLibrary('libglut.so.3');
end;


initialization
  InitGLUT;
finalization
  if Assigned(libGLUT) then dlClose(libGLUT);
end.