209 lines
7.1 KiB
C++
209 lines
7.1 KiB
C++
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/* -*-c++-*-
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* Copyright (C) 2017 Julien Valentin <mp3butcher@hotmail.com>
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#include <osg/Program>
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#include <osg/Sampler>
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#include <osg/Texture2D>
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#include <osg/ShapeDrawable>
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#include <osgViewer/Viewer>
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#include <osgViewer/ViewerEventHandlers>
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#include <osgGA/TrackballManipulator>
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#include <osgDB/ReadFile>
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#include <osgDB/WriteFile>
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/// add two composite texture color
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static const char* fragSource =
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{
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"uniform sampler2D tex1;\n"
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"uniform sampler2D tex2;\n"
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"void main(){\n"
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" vec4 color1 = texture2D(tex1,gl_TexCoord[0].st);\n"
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" vec4 color2 = texture2D(tex2,gl_TexCoord[0].st);\n"
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" gl_FragColor = vec4(color1.xyz+color2.xyz,1.0);\n"
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"}\n"
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};
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class KeyboardEventHandler : public osgGA::GUIEventHandler
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{
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public:
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KeyboardEventHandler(osg::Sampler* tessInnerU, osg::Sampler* tessOuterU,osg::StateSet* ss):
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_sampler1(tessInnerU),
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_sampler2(tessOuterU),_ss(ss){}
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virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& gaa)
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{
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osg::Texture:: FilterMode newone=osg::Texture::NEAREST;
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if(ea.getEventType()==osgGA::GUIEventAdapter::KEYDOWN)
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{
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switch (ea.getKey())
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{
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case osgGA::GUIEventAdapter::KEY_A:
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if(_sampler1->getFilter(osg::Texture::MAG_FILTER)==osg::Texture::NEAREST)
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newone=osg::Texture::LINEAR;
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_sampler1->setFilter(osg::Texture::MAG_FILTER,newone);
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_sampler1->setFilter(osg::Texture::MIN_FILTER,newone);
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return true;
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case osgGA::GUIEventAdapter::KEY_B:
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if(_sampler2->getFilter(osg::Texture::MAG_FILTER)==osg::Texture::NEAREST)
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newone=osg::Texture::LINEAR;
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_sampler2->setFilter(osg::Texture::MAG_FILTER,newone);
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_sampler2->setFilter(osg::Texture::MIN_FILTER,newone);
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return true;
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}
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}
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return osgGA::GUIEventHandler::handle(ea, gaa);
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}
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private:
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osg::Sampler* _sampler1;
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osg::Sampler* _sampler2;
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osg::StateSet* _ss;
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};
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int main(int argc, char* argv[])
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{
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osg::ArgumentParser arguments(&argc,argv);
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arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
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arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the standard OpenSceneGraph example for GL3 sampler.");
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osg::ApplicationUsage::UsageMap kmap;
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kmap["a"]="swap Linear/Nearest filtering on first texture";
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kmap["b"]="swap Linear/Nearest filtering on second texture";
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arguments.getApplicationUsage()->setKeyboardMouseBindings(kmap);
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osgViewer::Viewer viewer(arguments);
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osg::ref_ptr<osg::Program> program = new osg::Program();
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT,fragSource));
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osg::ref_ptr<osg::Node> loadedModel = osgDB::readRefNodeFiles(arguments);
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osg::ref_ptr<osg::Node> geode ;
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if (!loadedModel)
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{
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geode = new osg::Geode;
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((osg::Geode*)geode.get())->addDrawable(osg::createTexturedQuadGeometry(osg::Vec3(0,0,0),osg::Vec3(1,0,0),osg::Vec3(0,0,1) ));
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}
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else
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{
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geode=loadedModel;
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}
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osg::ref_ptr< osg::Texture2D> tex1, tex2;
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osg::ref_ptr<osg::Sampler > sampler1, sampler2;
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tex1=new osg::Texture2D();
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tex2=new osg::Texture2D();
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sampler1=new osg::Sampler();
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sampler2=new osg::Sampler();
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osg::Vec2ui resolution(4,4);
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{
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///first texture//NO RED
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unsigned char *data = new unsigned char[(resolution.x()* resolution.y()) * 4];
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unsigned char * ptr=data;
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unsigned int sw=0,cptx=0;
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while (ptr != data + sizeof(unsigned char)*(resolution.x()* resolution.y()) * 4)
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{
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if(sw==1)
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{
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*ptr++=0;
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*ptr++=0xff;
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*ptr++=0xff;
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*ptr++=0xff;
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}
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else
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{
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*ptr++=0;
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*ptr++=0;
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*ptr++=0;
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*ptr++=0xff;
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}
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if(++cptx<resolution.x())sw=sw?0:1;
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else cptx=0;
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}
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osg::ref_ptr<osg::Image >im = new osg::Image();
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im->setImage(resolution.x(), resolution.y(), 1,GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE, data, osg::Image::USE_NEW_DELETE);
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im->dirty();
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tex1->setImage(im);
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}
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{
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///second texture// RED ONLY
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unsigned char *data = new unsigned char[(resolution.x()* resolution.y()) * 4];
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unsigned char * ptr=data;
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unsigned int sw=0,cptx=0;
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while (ptr != data + sizeof(unsigned char)*(resolution.x()* resolution.y()) * 4)
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{
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if(sw==1)
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{
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*ptr++=255;
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*ptr++=0;
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*ptr++=0;
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*ptr++=255;
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}
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else
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{
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*ptr++=0;
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*ptr++=0;
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*ptr++=0;
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*ptr++=255;
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}
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if(++cptx<resolution.x())sw=sw?0:1;
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else cptx=0;
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}
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osg::ref_ptr<osg::Image >im = new osg::Image();
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im->setImage(resolution.x(), resolution.y(), 1,GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE, data, osg::Image::USE_NEW_DELETE);
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im->dirty();
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tex2->setImage(im);
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}
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///Overrided Filtering setup
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tex1->setFilter(osg::Texture::MAG_FILTER,osg::Texture::NEAREST);
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tex1->setFilter(osg::Texture::MIN_FILTER,osg::Texture::NEAREST);
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tex2->setFilter(osg::Texture::MAG_FILTER,osg::Texture::NEAREST);
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tex2->setFilter(osg::Texture::MIN_FILTER,osg::Texture::NEAREST);
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///Filter Override samplers setup
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sampler1->setFilter(osg::Texture::MAG_FILTER,osg::Texture::LINEAR);
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sampler1->setFilter(osg::Texture::MIN_FILTER,osg::Texture::LINEAR);
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sampler2->setFilter(osg::Texture::MAG_FILTER,osg::Texture::LINEAR);
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sampler2->setFilter(osg::Texture::MIN_FILTER,osg::Texture::LINEAR);
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osg::StateSet *ss;
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ss = geode->getOrCreateStateSet();
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ss->setTextureAttribute(0,tex1,osg::StateAttribute::ON);
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ss->setTextureAttribute(1,tex2,osg::StateAttribute::ON);
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ss->setTextureAttribute(0,sampler1,osg::StateAttribute::ON);
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ss->setTextureAttribute(1,sampler2,osg::StateAttribute::ON);
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ss->addUniform(new osg::Uniform("tex1",(int)0));
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ss->addUniform(new osg::Uniform("tex2",(int)1));
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ss->setAttribute(program.get());
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viewer.addEventHandler(new KeyboardEventHandler(sampler1, sampler2,ss));
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viewer.addEventHandler(new osgViewer::StatsHandler);
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viewer.addEventHandler(new osgViewer::HelpHandler(arguments.getApplicationUsage()));
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viewer.setSceneData(geode.get());
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return viewer.run();
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}
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