root/OpenSceneGraph/trunk/examples/osgoit/osgoit.cpp @ 13556

Revision 13556, 5.9 kB (checked in by robert, 2 hours ago)

Improved handling of ComboBox? popup toggling

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[13556]1/* OpenSceneGraph example, myosgoit.
2*
3*  Author: Christian Buchner, based on original osgoit by Mathias Frhlich
4*
5*  This demo provides a DepthPeeling object that can correctly compose
6*  solid and transparent geometry within the same scene. The transparent
7*  geometry can also use GLSL shaders, as demonstrated in the 3D HeatMap.
8*  The solid geometry is only rendered once, and its depth buffer blitted
9*  into the cameras rendering the transparency layers.
10*
11*  Permission is hereby granted, free of charge, to any person obtaining a copy
12*  of this software and associated documentation files (the "Software"), to deal
13*  in the Software without restriction, including without limitation the rights
14*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15*  copies of the Software, and to permit persons to whom the Software is
16*  furnished to do so, subject to the following conditions:
17*
18*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24*  THE SOFTWARE.
25*/
[11675]26
[13556]27#include "DepthPeeling.h"
28#include "HeatMap.h"
[11675]29
30#include <osgViewer/Viewer>
31#include <osgViewer/ViewerEventHandlers>
32
33#include <osg/Math>
[13556]34#include <osg/PositionAttitudeTransform>
35#include <osg/BlendFunc>
36#include <osg/Material>
37#include <osg/LightModel>
38#include <osgDB/ReadFile>
[11675]39
40#include <limits>
41#include <iostream>
42
43int main(int argc, char** argv)
44{
45    // use an ArgumentParser object to manage the program arguments.
46    osg::ArgumentParser arguments(&argc, argv);
47    arguments.getApplicationUsage()->addKeyboardMouseBinding("m", "Increase the number of depth peeling layers");
48    arguments.getApplicationUsage()->addKeyboardMouseBinding("n", "Decrease the number of depth peeling layers");
49    arguments.getApplicationUsage()->addKeyboardMouseBinding("l", "Toggle display of the individual or composed layer textures");
50    arguments.getApplicationUsage()->addKeyboardMouseBinding("p", "Increase the layer offset");
51    arguments.getApplicationUsage()->addKeyboardMouseBinding("o", "Decrease the layer offset");
52
53    // Have the usual viewer
54    osgViewer::Viewer viewer(arguments);
55
56    osg::DisplaySettings* displaySettings = new osg::DisplaySettings;
57    viewer.setDisplaySettings(displaySettings);
58   
59    // Add the stats handler
60    viewer.addEventHandler(new osgViewer::StatsHandler);
61   
62    // add the help handler
63    viewer.addEventHandler(new osgViewer::HelpHandler(arguments.getApplicationUsage()));
64
65    // any option left unread are converted into errors to write out later.
66    arguments.reportRemainingOptionsAsUnrecognized();
67   
[13556]68    // read the dump truck, we will need it twice
69    osg::ref_ptr<osg::Node> dt = osgDB::readNodeFile("dumptruck.osg");
[11675]70
[13556]71    // display a solid version of the dump truck
72    osg::ref_ptr<osg::PositionAttitudeTransform> solidModel = new osg::PositionAttitudeTransform;
73    solidModel->setPosition(osg::Vec3f(7.0f, -2.0f, 7.0f));
74    solidModel->addChild(dt.get());
75
76    // generate the 3D heatmap surface to display
77    osg::ref_ptr<Heatmap> hm = new Heatmap(30, 30, 10, 30, 30, 1.0, 0.25);
78    float data[30][30];
79    for (int x=0; x < 30; ++x)
80        for (int y=0; y < 30; ++y)
81            data[y][x] = (double)rand() / RAND_MAX;
82    hm->setData((float*)data, 10.0, 1.0, 0.25);
83
84    // add a transparent version of the truck to the scene also
85    osg::ref_ptr<osg::PositionAttitudeTransform> transparentTruck = new osg::PositionAttitudeTransform;
86    transparentTruck->setPosition(osg::Vec3f(7.0f, -25.0f, 7.0f));
87
88    // set the states of the truck so that it actually appears transparently and nicely lit.
89    osg::StateSet *state = transparentTruck->getOrCreateStateSet();
90    state->setMode(GL_BLEND, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
91    state->setAttribute(new osg::BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
92    osg::Material* material = new osg::Material;
93    material->setAmbient(osg::Material::FRONT_AND_BACK,osg::Vec4(0.2f,0.2f,0.2f,0.3f));
94    material->setDiffuse(osg::Material::FRONT_AND_BACK,osg::Vec4(0.8f,0.8f,0.8f,0.3f));
95    state->setAttribute(material,osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
96    osg::LightModel *lm = new osg::LightModel();
97    lm->setTwoSided(true);
98    state->setAttribute(lm, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
99    (transparentTruck.get())->addChild(dt.get());
100
101    // place the heatmap and a transparent dump truck in the transparent geometry group
102    osg::ref_ptr<osg::Group> transparentModel = new osg::Group;
103    (transparentModel.get())->addChild(hm.get());
104    (transparentModel.get())->addChild(transparentTruck.get());
105
106    // The initial size set to 0, 0. We get a resize event for the right size...
[11675]107    DepthPeeling* depthPeeling = new DepthPeeling(0, 0);
[13556]108    // the heat map already uses two textures bound to unit 0 and 1, so we can use TexUnit 2 for the peeling
109    depthPeeling->setTexUnit(2);
110    depthPeeling->setSolidScene(solidModel.get());
111    depthPeeling->setTransparentScene(transparentModel.get());
[11675]112    viewer.setSceneData(depthPeeling->getRoot());
113
114    // Add the event handler for the depth peeling stuff
[13556]115    viewer.addEventHandler(new DepthPeeling::EventHandler(depthPeeling));
116
117    // force a resize event, so the DepthPeeling object updates _texWidth and _texHeight
118    viewer.realize();
119    int x, y, width, height;
120    osgViewer::ViewerBase::Windows windows;
121    viewer.getWindows(windows);
122    windows.front()->getWindowRectangle(x,y,width,height);
123    viewer.getEventQueue()->windowResize(x,y,width,height);
124
[11675]125    return viewer.run();
126}
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