root/OpenSceneGraph/trunk/examples/osgpackeddepthstencil/osgpackeddepthstencil.cpp @ 13312

Revision 12292, 7.7 kB (checked in by robert, 4 years ago)

Ran svn propset -R svn:eol-style native . on the OpenSceneGraph

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1/* OpenSceneGraph example, osgpackeddepthstencil.
2*
3*  Permission is hereby granted, free of charge, to any person obtaining a copy
4*  of this software and associated documentation files (the "Software"), to deal
5*  in the Software without restriction, including without limitation the rights
6*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7*  copies of the Software, and to permit persons to whom the Software is
8*  furnished to do so, subject to the following conditions:
9*
10*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
11*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
13*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
14*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
15*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
16*  THE SOFTWARE.
17*/
18
19#include <osg/GLExtensions>
20#include <osg/Node>
21#include <osg/Geometry>
22#include <osg/Notify>
23#include <osg/Texture2D>
24#include <osg/Stencil>
25#include <osg/ColorMask>
26#include <osg/Geode>
27#include <osg/FrameBufferObject>
28
29#include <osgViewer/Viewer>
30#include <osgViewer/ViewerEventHandlers>
31
32#include <iostream>
33
34osg::Geode* createMask()
35{
36    osg::Vec3Array *vertices = new osg::Vec3Array;
37    vertices->push_back(osg::Vec3(-0.5, -0.5, 0.0));
38    vertices->push_back(osg::Vec3(0.5, -0.5, 0.0));
39    vertices->push_back(osg::Vec3(0.5, 0.5, 0.0));
40    vertices->push_back(osg::Vec3(-0.5, 0.5, 0.0));
41
42    osg::Geometry *geom = new osg::Geometry;
43    geom->setVertexArray(vertices);
44    geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, 0, 4));
45
46    osg::Geode *geode = new osg::Geode;
47    geode->addDrawable(geom);
48
49    osg::Stencil* stencil = new osg::Stencil;
50    stencil->setFunction(osg::Stencil::ALWAYS, 1, ~0u);
51    stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::REPLACE);
52
53    osg::StateSet *ss = geode->getOrCreateStateSet();
54    ss->setAttributeAndModes(stencil,
55        osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
56    ss->setAttribute(new osg::ColorMask(false, false, false, false),
57        osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
58
59    return geode;
60}
61
62osg::Geode* createGeometry()
63{
64    osg::Vec3Array* vertices = new osg::Vec3Array;
65    vertices->push_back(osg::Vec3(-1.0, -1.0, 0.0));
66    vertices->push_back(osg::Vec3(1.0, -1.0, 0.0));
67    vertices->push_back(osg::Vec3(1.0, 1.0, 0.0));
68    vertices->push_back(osg::Vec3(-1.0, 1.0, 0.0));
69
70    osg::Geometry* geom = new osg::Geometry;
71    geom->setVertexArray(vertices);
72    geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, 0, 4));
73
74    osg::Geode* geode = new osg::Geode;
75    geode->addDrawable(geom);
76
77    osg::Stencil* stencil = new osg::Stencil;
78    stencil->setFunction(osg::Stencil::NOTEQUAL, 1, ~0u);
79    stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::KEEP);
80
81    osg::StateSet *ss = geode->getOrCreateStateSet();
82    ss->setAttributeAndModes(stencil,
83        osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
84
85    return geode;
86}
87
88osg::Geode* createTextureQuad(osg::Texture2D *texture)
89{
90    osg::Vec3Array *vertices = new osg::Vec3Array;
91    vertices->push_back(osg::Vec3(-0.8, 0.0, -0.8));
92    vertices->push_back(osg::Vec3(0.8, 0.0, -0.8));
93    vertices->push_back(osg::Vec3(0.8, 0.0, 0.8));
94    vertices->push_back(osg::Vec3(-0.8, 0.0, 0.8));
95
96    osg::Vec2Array *texcoord = new osg::Vec2Array;
97    texcoord->push_back(osg::Vec2(0.0, 0.0));
98    texcoord->push_back(osg::Vec2(1.0, 0.0));
99    texcoord->push_back(osg::Vec2(1.0, 1.0));
100    texcoord->push_back(osg::Vec2(0.0, 1.0));
101
102    osg::Geometry *geom = new osg::Geometry;
103    geom->setVertexArray(vertices);
104    geom->setTexCoordArray(0, texcoord);
105    geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, 0, 4));
106
107    osg::Geode *geode = new osg::Geode;
108    geode->addDrawable(geom);
109    geode->getOrCreateStateSet()->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);
110
111    return geode;
112}
113
114
115int main( int argc, char **argv )
116{
117    // use an ArgumentParser object to manage the program arguments.
118    osg::ArgumentParser arguments(&argc,argv);
119
120    arguments.getApplicationUsage()->addCommandLineOption("--fbo","Use Frame Buffer Object for render to texture, where supported.");
121    arguments.getApplicationUsage()->addCommandLineOption("--pbuffer-rtt","Use Pixel Buffer for render to texture, where supported.");
122    arguments.getApplicationUsage()->addCommandLineOption("--nopds", "Don't use packed depth stencil.");
123    arguments.getApplicationUsage()->addCommandLineOption("--fbo-samples","");
124    arguments.getApplicationUsage()->addCommandLineOption("--color-samples", "");
125
126    // construct the viewer.
127    osgViewer::Viewer viewer(arguments);
128
129    // add stats
130    viewer.addEventHandler( new osgViewer::StatsHandler() );
131
132    // if user request help write it out to cout.
133    if (arguments.read("-h") || arguments.read("--help"))
134    {
135        arguments.getApplicationUsage()->write(std::cout);
136        return 1;
137    }
138
139    osg::Camera::RenderTargetImplementation renderImplementation = osg::Camera::FRAME_BUFFER_OBJECT;
140    int colorSamples = 0, samples = 0;
141    bool usePDS = true;
142
143    while (arguments.read("--fbo")) { renderImplementation = osg::Camera::FRAME_BUFFER_OBJECT; }
144    while (arguments.read("--pbuffer-rtt")) { renderImplementation = osg::Camera::PIXEL_BUFFER_RTT; }
145    while (arguments.read("--nopds")) { usePDS = false; }
146    while (arguments.read("--fbo-samples", samples)) {}
147    while (arguments.read("--color-samples", colorSamples)) {}
148   
149
150    osg::Group* rootNode = new osg::Group;
151    rootNode->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
152
153    // creates texture to be rendered
154    osg::Texture2D *texture = new osg::Texture2D;
155    texture->setTextureSize(1024, 1024);
156    texture->setInternalFormat(GL_RGBA);
157    texture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
158    texture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
159    texture->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
160    texture->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
161    texture->setBorderColor(osg::Vec4(0, 0, 0, 0));
162
163    // creates rtt camera
164    osg::ref_ptr<osg::Camera> rttCamera = new osg::Camera;
165    rttCamera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
166    rttCamera->setClearColor(osg::Vec4(0.0, 0.4, 0.5, 0.0));
167    rttCamera->setClearStencil(0);
168    rttCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
169    rttCamera->setViewMatrix(osg::Matrixd::identity());
170    rttCamera->setViewport(0, 0, 1024, 1024);
171    rttCamera->setRenderOrder(osg::Camera::PRE_RENDER);
172    rttCamera->setRenderTargetImplementation(renderImplementation);
173
174    if(usePDS)
175    {
176        rttCamera->attach(osg::Camera::PACKED_DEPTH_STENCIL_BUFFER, GL_DEPTH_STENCIL_EXT);
177    }
178    else
179    {
180        // this doesn't work on NVIDIA/Vista 64bit
181        // FBO status = 0x8cd6 (FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT)
182        rttCamera->attach(osg::Camera::DEPTH_BUFFER, GL_DEPTH_COMPONENT);
183        rttCamera->attach(osg::Camera::STENCIL_BUFFER, GL_STENCIL_INDEX8_EXT);
184    }
185
186    rttCamera->attach(osg::Camera::COLOR_BUFFER, texture, 0, 0, false, samples, colorSamples);
187    rttCamera->setCullingMode(osg::Camera::VIEW_FRUSTUM_SIDES_CULLING);
188
189    // creates rtt subtree
190    osg::Group* g0 = new osg::Group;
191    g0->addChild(createMask());
192    g0->addChild(createGeometry());
193    rttCamera->addChild(g0);
194    rootNode->addChild(rttCamera.get());
195
196    // creates textured quad with result
197    rootNode->addChild(createTextureQuad(texture));
198   
199    // add model to the viewer.
200    viewer.setSceneData( rootNode );
201
202    return viewer.run();
203}
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