simgear/scene/util/SGSceneFeatures.cxx

   1 /* -*-c++-*-
   2  *
   3  * Copyright (C) 2006-2007 Mathias Froehlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of the
   8  * License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  18  * MA 02110-1301, USA.
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #  include <simgear_config.h>
  24 #endif
  25
  26 #include "SGSceneFeatures.hxx"
  27
  28 #include <osg/FragmentProgram>
  29 #include <osg/VertexProgram>
  30 #include <osg/Point>
  31 #include <osg/PointSprite>
  32
  33 #include <simgear/structure/SGSharedPtr.hxx>
  34 #include <simgear/threads/SGThread.hxx>
  35 #include <simgear/threads/SGGuard.hxx>
  36
  37 SGSceneFeatures::SGSceneFeatures() :
  38   _shaderLights(true),
  39   _pointSpriteLights(true),
  40   _distanceAttenuationLights(true)
  41 {
  42 }
  43
  44 SGSceneFeatures*
  45 SGSceneFeatures::instance()
  46 {
  47   static SGSharedPtr<SGSceneFeatures> sceneFeatures;
  48   if (sceneFeatures)
  49     return sceneFeatures;
  50   static SGMutex mutex;
  51   SGGuard<SGMutex> guard(mutex);
  52   if (sceneFeatures)
  53     return sceneFeatures;
  54   sceneFeatures = new SGSceneFeatures;
  55   return sceneFeatures;
  56 }
  57
  58 bool
  59 SGSceneFeatures::getHavePointSprites(unsigned contextId) const
  60 {
  61   return osg::PointSprite::isPointSpriteSupported(contextId);
  62 }
  63
  64 bool
  65 SGSceneFeatures::getHaveFragmentPrograms(unsigned contextId) const
  66 {
  67   const osg::FragmentProgram::Extensions* fpe;
  68   fpe = osg::FragmentProgram::getExtensions(contextId, true);
  69   if (!fpe)
  70     return false;
  71   if (!fpe->isFragmentProgramSupported())
  72     return false;
  73
  74   return true;
  75 }
  76
  77 bool
  78 SGSceneFeatures::getHaveVertexPrograms(unsigned contextId) const
  79 {
  80   const osg::VertexProgram::Extensions* vpe;
  81   vpe = osg::VertexProgram::getExtensions(contextId, true);
  82   if (!vpe)
  83     return false;
  84   if (!vpe->isVertexProgramSupported())
  85     return false;
  86
  87   return true;
  88 }
  89
  90 bool
  91 SGSceneFeatures::getHaveShaderPrograms(unsigned contextId) const
  92 {
  93   if (!getHaveFragmentPrograms(contextId))
  94     return false;
  95   return getHaveVertexPrograms(contextId);
  96 }
  97
  98 bool
  99 SGSceneFeatures::getHavePointParameters(unsigned contextId) const
 100 {
 101   const osg::Point::Extensions* pe;
 102   pe = osg::Point::getExtensions(contextId, true);
 103   if (!pe)
 104     return false;
 105   if (!pe->isPointParametersSupported())
 106     return false;
 107   return true;
 108 }
 109