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 #include <osg/Texture>
  33
  34 #include <simgear/structure/SGSharedPtr.hxx>
  35 #include <simgear/threads/SGThread.hxx>
  36 #include <simgear/threads/SGGuard.hxx>
  37
  38 SGSceneFeatures::SGSceneFeatures() :
  39   _textureCompression(UseARBCompression),
  40   _shaderLights(true),
  41   _pointSpriteLights(true),
  42   _distanceAttenuationLights(true)
  43 {
  44 }
  45
  46 SGSceneFeatures*
  47 SGSceneFeatures::instance()
  48 {
  49   static SGSharedPtr<SGSceneFeatures> sceneFeatures;
  50   if (sceneFeatures)
  51     return sceneFeatures;
  52   static SGMutex mutex;
  53   SGGuard<SGMutex> guard(mutex);
  54   if (sceneFeatures)
  55     return sceneFeatures;
  56   sceneFeatures = new SGSceneFeatures;
  57   return sceneFeatures;
  58 }
  59
  60 void
  61 SGSceneFeatures::setTextureCompression(osg::Texture* texture) const
  62 {
  63   switch (_textureCompression) {
  64   case UseARBCompression:
  65     texture->setInternalFormatMode(osg::Texture::USE_ARB_COMPRESSION);
  66     break;
  67   case UseDXT1Compression:
  68     texture->setInternalFormatMode(osg::Texture::USE_S3TC_DXT1_COMPRESSION);
  69     break;
  70   case UseDXT3Compression:
  71     texture->setInternalFormatMode(osg::Texture::USE_S3TC_DXT3_COMPRESSION);
  72     break;
  73   case UseDXT5Compression:
  74     texture->setInternalFormatMode(osg::Texture::USE_S3TC_DXT5_COMPRESSION);
  75     break;
  76   default:
  77     texture->setInternalFormatMode(osg::Texture::USE_IMAGE_DATA_FORMAT);
  78     break;
  79   }
  80 }
  81
  82 bool
  83 SGSceneFeatures::getHavePointSprites(unsigned contextId) const
  84 {
  85   return osg::PointSprite::isPointSpriteSupported(contextId);
  86 }
  87
  88 bool
  89 SGSceneFeatures::getHaveFragmentPrograms(unsigned contextId) const
  90 {
  91   const osg::FragmentProgram::Extensions* fpe;
  92   fpe = osg::FragmentProgram::getExtensions(contextId, true);
  93   if (!fpe)
  94     return false;
  95   if (!fpe->isFragmentProgramSupported())
  96     return false;
  97
  98   return true;
  99 }
 100
 101 bool
 102 SGSceneFeatures::getHaveVertexPrograms(unsigned contextId) const
 103 {
 104   const osg::VertexProgram::Extensions* vpe;
 105   vpe = osg::VertexProgram::getExtensions(contextId, true);
 106   if (!vpe)
 107     return false;
 108   if (!vpe->isVertexProgramSupported())
 109     return false;
 110
 111   return true;
 112 }
 113
 114 bool
 115 SGSceneFeatures::getHaveShaderPrograms(unsigned contextId) const
 116 {
 117   if (!getHaveFragmentPrograms(contextId))
 118     return false;
 119   return getHaveVertexPrograms(contextId);
 120 }
 121
 122 bool
 123 SGSceneFeatures::getHavePointParameters(unsigned contextId) const
 124 {
 125   const osg::Point::Extensions* pe;
 126   pe = osg::Point::getExtensions(contextId, true);
 127   if (!pe)
 128     return false;
 129   if (!pe->isPointParametersSupported())
 130     return false;
 131   return true;
 132 }
 133