simgear/scene/util/StateAttributeFactory.cxx

   1 /* -*-c++-*-
   2  *
   3  * Copyright (C) 2007 Tim Moore
   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 #include <OpenThreads/ScopedLock>
  23
  24 #include <osg/Image>
  25 #include "StateAttributeFactory.hxx"
  26
  27 using namespace osg;
  28
  29 namespace simgear
  30 {
  31 StateAttributeFactory::StateAttributeFactory()
  32 {
  33     _standardAlphaFunc = new AlphaFunc;
  34     _standardAlphaFunc->setFunction(osg::AlphaFunc::GREATER);
  35     _standardAlphaFunc->setReferenceValue(0.01);
  36     _standardAlphaFunc->setDataVariance(Object::STATIC);
  37     _smooth = new ShadeModel;
  38     _smooth->setMode(ShadeModel::SMOOTH);
  39     _smooth->setDataVariance(Object::STATIC);
  40     _flat = new ShadeModel(ShadeModel::FLAT);
  41     _flat->setDataVariance(Object::STATIC);
  42     _standardBlendFunc = new BlendFunc;
  43     _standardBlendFunc->setSource(BlendFunc::SRC_ALPHA);
  44     _standardBlendFunc->setDestination(BlendFunc::ONE_MINUS_SRC_ALPHA);
  45     _standardBlendFunc->setDataVariance(Object::STATIC);
  46     _standardTexEnv = new TexEnv;
  47     _standardTexEnv->setMode(TexEnv::MODULATE);
  48     _standardTexEnv->setDataVariance(Object::STATIC);
  49     osg::Image *dummyImage = new osg::Image;
  50     dummyImage->allocateImage(1, 1, 1, GL_LUMINANCE_ALPHA,
  51                               GL_UNSIGNED_BYTE);
  52     unsigned char* imageBytes = dummyImage->data(0, 0);
  53     imageBytes[0] = 255;
  54     imageBytes[1] = 255;
  55     _whiteTexture = new osg::Texture2D;
  56     _whiteTexture->setImage(dummyImage);
  57     _whiteTexture->setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
  58     _whiteTexture->setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
  59     _whiteTexture->setDataVariance(osg::Object::STATIC);
  60 }
  61
  62 osg::ref_ptr<StateAttributeFactory> StateAttributeFactory::_theInstance;
  63 OpenThreads::Mutex StateAttributeFactory::_instanceMutex;
  64
  65 StateAttributeFactory* StateAttributeFactory::instance()
  66 {
  67     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_instanceMutex);
  68     if (!_theInstance.valid()) {
  69         _theInstance = new StateAttributeFactory;
  70     }
  71     return _theInstance.get();
  72 }
  73 }