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 #include "StateAttributeFactory.hxx"
  22
  23 #include <osg/AlphaFunc>
  24 #include <osg/Array>
  25 #include <osg/BlendFunc>
  26 #include <osg/CullFace>
  27 #include <osg/Depth>
  28 #include <osg/ShadeModel>
  29 #include <osg/Texture2D>
  30 #include <osg/TexEnv>
  31
  32 #include <osg/Image>
  33
  34 using namespace osg;
  35
  36 namespace simgear
  37 {
  38 StateAttributeFactory::StateAttributeFactory()
  39 {
  40     _standardAlphaFunc = new AlphaFunc;
  41     _standardAlphaFunc->setFunction(osg::AlphaFunc::GREATER);
  42     _standardAlphaFunc->setReferenceValue(0.01);
  43     _standardAlphaFunc->setDataVariance(Object::STATIC);
  44     _smooth = new ShadeModel;
  45     _smooth->setMode(ShadeModel::SMOOTH);
  46     _smooth->setDataVariance(Object::STATIC);
  47     _flat = new ShadeModel(ShadeModel::FLAT);
  48     _flat->setDataVariance(Object::STATIC);
  49     _standardBlendFunc = new BlendFunc;
  50     _standardBlendFunc->setSource(BlendFunc::SRC_ALPHA);
  51     _standardBlendFunc->setDestination(BlendFunc::ONE_MINUS_SRC_ALPHA);
  52     _standardBlendFunc->setDataVariance(Object::STATIC);
  53     _standardTexEnv = new TexEnv;
  54     _standardTexEnv->setMode(TexEnv::MODULATE);
  55     _standardTexEnv->setDataVariance(Object::STATIC);
  56     osg::Image *dummyImage = new osg::Image;
  57     dummyImage->allocateImage(1, 1, 1, GL_LUMINANCE_ALPHA,
  58                               GL_UNSIGNED_BYTE);
  59     unsigned char* imageBytes = dummyImage->data(0, 0);
  60     imageBytes[0] = 255;
  61     imageBytes[1] = 255;
  62     _whiteTexture = new osg::Texture2D;
  63     _whiteTexture->setImage(dummyImage);
  64     _whiteTexture->setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
  65     _whiteTexture->setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
  66     _whiteTexture->setDataVariance(osg::Object::STATIC);
  67     // And now the transparent texture
  68     dummyImage = new osg::Image;
  69     dummyImage->allocateImage(1, 1, 1, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE);
  70     imageBytes = dummyImage->data(0, 0);
  71     imageBytes[0] = 255;
  72     imageBytes[1] = 0;
  73     _transparentTexture = new osg::Texture2D;
  74     _transparentTexture->setImage(dummyImage);
  75     _transparentTexture->setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
  76     _transparentTexture->setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
  77     _transparentTexture->setDataVariance(osg::Object::STATIC);
  78     _white = new Vec4Array(1);
  79     (*_white)[0].set(1.0f, 1.0f, 1.0f, 1.0f);
  80     _white->setDataVariance(Object::STATIC);
  81     _cullFaceFront = new CullFace(CullFace::FRONT);
  82     _cullFaceFront->setDataVariance(Object::STATIC);
  83     _cullFaceBack = new CullFace(CullFace::BACK);
  84     _cullFaceBack->setDataVariance(Object::STATIC);
  85     _depthWritesDisabled = new Depth(Depth::LESS, 0.0, 1.0, false);
  86     _depthWritesDisabled->setDataVariance(Object::STATIC);
  87 }
  88
  89 }