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/* OpenSceneGraph example, osgemscripten.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef OSGEMSCRIPTEN_OSGEMSCRIPTEN_H
#define OSGEMSCRIPTEN_OSGEMSCRIPTEN_H
#include "functions.h"
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
#include <osgGA/TrackballManipulator>
// VBO setup visitor.
#include <osg/Geode>
#include <osg/Geometry>
#include <osg/NodeVisitor>
// Initialize OSG plugins statically.
USE_OSGPLUGIN(osg2)
USE_SERIALIZER_WRAPPER_LIBRARY(osg)
// This class prints OpenSceneGraph notifications to console.
class Logger : public osg::NotifyHandler
{
public:
Logger() { }
virtual ~Logger() { }
// Override NotifyHandler::notify() to receive OpenSceneGraph notifications.
void notify(osg::NotifySeverity severity, const char *message)
{
printf("OSG/%s %s", logLevelToString(severity).c_str(), message);
}
};
// This class forces the use of VBO.
class VBOSetupVisitor : public osg::NodeVisitor
{
public:
VBOSetupVisitor() :
osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) { }
virtual void apply(osg::Geode &geode)
{
for (unsigned int i = 0; i < geode.getNumDrawables(); ++i)
{
osg::Geometry *geom =
dynamic_cast<osg::Geometry*>(geode.getDrawable(i));
if (geom)
{
geom->setUseVertexBufferObjects(true);
}
}
NodeVisitor::apply(geode);
}
};
class Application
{
public:
Application()
{
setupLogging();
setupRendering();
}
~Application()
{
tearDownLogging();
tearDownRendering();
}
bool handleEvent(SDL_Event &e)
{
osgViewer::GraphicsWindow *gw =
dynamic_cast<osgViewer::GraphicsWindow *>(
mViewer->getCamera()->getGraphicsContext());
if (!gw)
{
return false;
}
osgGA::EventQueue &queue = *(gw->getEventQueue());
switch (e.type)
{
case SDL_MOUSEMOTION:
queue.mouseMotion(e.motion.x, e.motion.y);
return true;
case SDL_MOUSEBUTTONDOWN:
queue.mouseButtonPress(e.button.x, e.button.y, e.button.button);
printf("OSGWeb. Application. Mouse button down\n");
return true;
case SDL_MOUSEBUTTONUP:
queue.mouseButtonRelease(e.button.x, e.button.y, e.button.button);
printf("OSGWeb. Application. Mouse button up\n");
return true;
default:
break;
}
return false;
}
void loadScene(const std::string &fileName)
{
// Load scene.
osg::Node *scene = osgDB::readNodeFile(fileName);
if (!scene)
{
printf("Could not load scene\n");
return;
}
// Use VBO and EBO instead of display lists. CRITICAL for Emscripten
// to skip FULL_ES2 emulation flag.
VBOSetupVisitor vbo;
scene->accept(vbo);
// Load shaders.
osg::Program *prog = createShaderProgram(shaderVertex, shaderFragment);
// Apply shaders.
scene->getOrCreateStateSet()->setAttribute(prog);
// Set scene.
mViewer->setSceneData(scene);
}
void setupWindow(int width, int height)
{
mViewer->setUpViewerAsEmbeddedInWindow(0, 0, width, height);
}
void frame()
{
mViewer->frame();
}
private:
void setupLogging()
{
// Create custom logger.
mLogger = new Logger;
// Provide the logger to OpenSceneGraph.
osg::setNotifyHandler(mLogger);
// Only accept notifications of Info level or higher
// like warnings and errors.
osg::setNotifyLevel(osg::INFO);
}
void setupRendering()
{
// Create OpenSceneGraph viewer.
mViewer = new osgViewer::Viewer;
// Use single thread: CRITICAL for Emscripten.
mViewer->setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
// Create manipulator: CRITICAL for Emscripten.
mViewer->setCameraManipulator(new osgGA::TrackballManipulator);
}
void tearDownLogging()
{
// Remove the logger from OpenSceneGraph.
// This also destroys the logger: no need to deallocate it manually.
osg::setNotifyHandler(0);
}
void tearDownRendering()
{
delete mViewer;
}
private:
Logger *mLogger;
osgViewer::Viewer *mViewer;
};
#endif // OSGEMSCRIPTEN_OSGEMSCRIPTEN_H
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