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