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 <OpenThreads/Mutex>
  35 #include <OpenThreads/ScopedLock>
  36
  37 #include <simgear/structure/SGSharedPtr.hxx>
  38
  39 SGSceneFeatures::SGSceneFeatures() :
  40   _textureCompression(UseARBCompression),
  41   _shaderLights(true),
  42   _pointSpriteLights(true),
  43   _distanceAttenuationLights(true),
  44   _textureFilter(1)
  45 {
  46 }
  47
  48 static OpenThreads::Mutex mutexSGSceneFeatures_instance;
  49 SGSceneFeatures*
  50 SGSceneFeatures::instance()
  51 {
  52   static SGSharedPtr<SGSceneFeatures> sceneFeatures;
  53   if (sceneFeatures)
  54     return sceneFeatures;
  55   OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mutexSGSceneFeatures_instance);
  56   if (sceneFeatures)
  57     return sceneFeatures;
  58   sceneFeatures = new SGSceneFeatures;
  59   return sceneFeatures;
  60 }
  61
  62 void
  63 SGSceneFeatures::setTextureCompression(osg::Texture* texture) const
  64 {
  65   switch (_textureCompression) {
  66   case UseARBCompression:
  67     texture->setInternalFormatMode(osg::Texture::USE_ARB_COMPRESSION);
  68     break;
  69   case UseDXT1Compression:
  70     texture->setInternalFormatMode(osg::Texture::USE_S3TC_DXT1_COMPRESSION);
  71     break;
  72   case UseDXT3Compression:
  73     texture->setInternalFormatMode(osg::Texture::USE_S3TC_DXT3_COMPRESSION);
  74     break;
  75   case UseDXT5Compression:
  76     texture->setInternalFormatMode(osg::Texture::USE_S3TC_DXT5_COMPRESSION);
  77     break;
  78   default:
  79     texture->setInternalFormatMode(osg::Texture::USE_IMAGE_DATA_FORMAT);
  80     break;
  81   }
  82 }
  83
  84 bool
  85 SGSceneFeatures::getHavePointSprites(unsigned contextId) const
  86 {
  87   return osg::PointSprite::isPointSpriteSupported(contextId);
  88 }
  89
  90 bool
  91 SGSceneFeatures::getHaveFragmentPrograms(unsigned contextId) const
  92 {
  93   const osg::FragmentProgram::Extensions* fpe;
  94   fpe = osg::FragmentProgram::getExtensions(contextId, true);
  95   if (!fpe)
  96     return false;
  97   if (!fpe->isFragmentProgramSupported())
  98     return false;
  99
 100   return true;
 101 }
 102
 103 bool
 104 SGSceneFeatures::getHaveVertexPrograms(unsigned contextId) const
 105 {
 106   const osg::VertexProgram::Extensions* vpe;
 107   vpe = osg::VertexProgram::getExtensions(contextId, true);
 108   if (!vpe)
 109     return false;
 110   if (!vpe->isVertexProgramSupported())
 111     return false;
 112
 113   return true;
 114 }
 115
 116 bool
 117 SGSceneFeatures::getHaveShaderPrograms(unsigned contextId) const
 118 {
 119   if (!getHaveFragmentPrograms(contextId))
 120     return false;
 121   return getHaveVertexPrograms(contextId);
 122 }
 123
 124 bool
 125 SGSceneFeatures::getHavePointParameters(unsigned contextId) const
 126 {
 127   const osg::Point::Extensions* pe;
 128   pe = osg::Point::getExtensions(contextId, true);
 129   if (!pe)
 130     return false;
 131   if (!pe->isPointParametersSupported())
 132     return false;
 133   return true;
 134 }
 135