308 lines
9.1 KiB
C++
308 lines
9.1 KiB
C++
// -*-c++-*-
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/*
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* demonstrates usage of osg::TextureRectangle.
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*
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* Actually there isn't much difference to the rest of the osg::Texture*
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* bunch only this:
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* - texture coordinates for texture rectangles must be in image
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* coordinates instead of normalized coordinates (0-1). So for a 500x250
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* image the coordinates for the entire image would be
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* 0,250 0,0 500,0 500,250 instead of 0,1 0,0 1,0 1,1
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* - only the following wrap modes are supported (but not enforced)
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* CLAMP, CLAMP_TO_EDGE, CLAMP_TO_BORDER
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* - a border is not supported
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* - mipmap is not supported
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*/
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#include <osg/Notify>
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#include <osg/TextureRectangle>
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#include <osg/Geometry>
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#include <osg/Geode>
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#include <osg/Group>
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#include <osg/Projection>
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#include <osg/MatrixTransform>
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#include <osgText/Text>
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#include <osgDB/Registry>
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#include <osgDB/ReadFile>
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#include <osgProducer/Viewer>
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/**********************************************************************
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*
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* Texture pan animation callback
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*
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**********************************************************************/
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class TexturePanCallback : public osg::NodeCallback
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{
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public:
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TexturePanCallback(osg::Geometry* geom, osg::Image* img,
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double delay = 0.05) :
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_geom(geom),
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_img(img),
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_phaseS(35.0f),
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_phaseT(18.0f),
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_phaseScale(5.0f),
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_delay(delay),
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_prevTime(0.0)
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{
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}
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virtual void operator()(osg::Node*, osg::NodeVisitor* nv)
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{
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if (!_geom || !_img)
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return;
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if (nv->getFrameStamp()) {
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double currTime = nv->getFrameStamp()->getReferenceTime();
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if (currTime - _prevTime > _delay) {
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float rad = osg::DegreesToRadians(currTime);
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// zoom scale (0.2 - 1.0)
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float scale = sin(rad * _phaseScale) * 0.4f + 0.6f;
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float scaleR = 1.0f - scale;
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// calculate new texture coordinates
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float s, t;
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s = ((sin(rad * _phaseS) + 1) * 0.5f) * (_img->s() * scaleR);
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t = ((sin(rad * _phaseT) + 1) * 0.5f) * (_img->t() * scaleR);
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// set new texture coordinate array
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osg::Vec2Array* texcoords = (osg::Vec2Array*) _geom->getTexCoordArray(0);
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float w = _img->s() * scale, h = _img->t() * scale;
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(*texcoords)[0].set(s, t+h);
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(*texcoords)[1].set(s, t);
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(*texcoords)[2].set(s+w, t);
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(*texcoords)[3].set(s+w, t+h);
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// record time
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_prevTime = currTime;
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}
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}
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}
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private:
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osg::Geometry* _geom;
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osg::Image* _img;
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float _phaseS, _phaseT, _phaseScale;
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double _delay;
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double _prevTime;
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};
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osg::Node* createRectangle(osg::BoundingBox& bb,
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const std::string& filename)
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{
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osg::Vec3 top_left(bb.xMin(),bb.yMax(),bb.zMax());
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osg::Vec3 bottom_left(bb.xMin(),bb.yMax(),bb.zMin());
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osg::Vec3 bottom_right(bb.xMax(),bb.yMax(),bb.zMin());
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osg::Vec3 top_right(bb.xMax(),bb.yMax(),bb.zMax());
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// create geometry
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osg::Geometry* geom = new osg::Geometry;
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osg::Vec3Array* vertices = new osg::Vec3Array(4);
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(*vertices)[0] = top_left;
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(*vertices)[1] = bottom_left;
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(*vertices)[2] = bottom_right;
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(*vertices)[3] = top_right;
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geom->setVertexArray(vertices);
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osg::Vec2Array* texcoords = new osg::Vec2Array(4);
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(*texcoords)[0].set(0.0f, 0.0f);
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(*texcoords)[1].set(1.0f, 0.0f);
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(*texcoords)[2].set(1.0f, 1.0f);
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(*texcoords)[3].set(0.0f, 1.0f);
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geom->setTexCoordArray(0,texcoords);
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osg::Vec3Array* normals = new osg::Vec3Array(1);
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(*normals)[0].set(0.0f,-1.0f,0.0f);
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geom->setNormalArray(normals);
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geom->setNormalBinding(osg::Geometry::BIND_OVERALL);
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osg::Vec4Array* colors = new osg::Vec4Array(1);
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(*colors)[0].set(1.0f,1.0f,1.0f,1.0f);
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geom->setColorArray(colors);
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geom->setColorBinding(osg::Geometry::BIND_OVERALL);
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geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, 0, 4));
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// disable display list so our modified tex coordinates show up
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geom->setUseDisplayList(false);
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// setup texture
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osg::TextureRectangle* texture = new osg::TextureRectangle;
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// load image
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osg::Image* img = osgDB::readImageFile(filename);
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texture->setImage(img);
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// setup state
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osg::StateSet* state = geom->getOrCreateStateSet();
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state->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);
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// turn off lighting
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state->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
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// install 'update' callback
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osg::Geode* geode = new osg::Geode;
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geode->addDrawable(geom);
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geode->setUpdateCallback(new TexturePanCallback(geom, img));
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return geode;
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}
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osg::Geode* createText(const std::string& str,
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const osg::Vec3& pos)
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{
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static std::string font("fonts/arial.ttf");
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osg::Geode* geode = new osg::Geode;
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osgText::Text* text = new osgText::Text;
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geode->addDrawable(text);
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text->setFont(font);
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text->setPosition(pos);
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text->setText(str);
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return geode;
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}
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osg::Node* createHUD()
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{
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osg::Group* group = new osg::Group;
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// turn off lighting and depth test
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osg::StateSet* state = group->getOrCreateStateSet();
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state->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
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state->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
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// add text
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osg::Vec3 pos(120.0f, 800.0f, 0.0f);
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const osg::Vec3 delta(0.0f, -80.0f, 0.0f);
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const char* text[] = {
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"TextureRectangle Mini-HOWTO",
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"- essentially behaves like Texture2D, *except* that:",
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"- tex coords must be non-normalized (0..pixel) instead of (0..1)",
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"- wrap modes must be CLAMP, CLAMP_TO_EDGE, or CLAMP_TO_BORDER\n repeating wrap modes are not supported",
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"- filter modes must be NEAREST or LINEAR since\n mipmaps are not supported",
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"- texture borders are not supported",
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"- defaults should be fine",
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NULL
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};
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const char** t = text;
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while (*t) {
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group->addChild(createText(*t++, pos));
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pos += delta;
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}
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// create HUD
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osg::MatrixTransform* modelview_abs = new osg::MatrixTransform;
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modelview_abs->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
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modelview_abs->setMatrix(osg::Matrix::identity());
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modelview_abs->addChild(group);
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osg::Projection* projection = new osg::Projection;
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projection->setMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
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projection->addChild(modelview_abs);
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return projection;
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}
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osg::Node* createModel(const std::string& filename)
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{
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osg::Group* root = new osg::Group;
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if (filename != "X") {
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osg::BoundingBox bb(0.0f,0.0f,0.0f,1.0f,1.0f,1.0f);
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root->addChild(createRectangle(bb, filename)); // XXX
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}
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root->addChild(createHUD());
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return root;
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}
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int main(int argc, char** argv)
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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// set up the usage document, in case we need to print out how to use this program.
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arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is a demo which demonstrates use of osg::TextureRectangle.");
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] <image> ...");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
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// construct the viewer.
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osgProducer::Viewer viewer(arguments);
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// set up the value with sensible default event handlers.
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viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
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// get details on keyboard and mouse bindings used by the viewer.
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viewer.getUsage(*arguments.getApplicationUsage());
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// if user request help write it out to cout.
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if (arguments.read("-h") || arguments.read("--help"))
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{
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arguments.getApplicationUsage()->write(std::cout);
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return 1;
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}
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// any option left unread are converted into errors to write out later.
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arguments.reportRemainingOptionsAsUnrecognized();
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// report any errors if they have occured when parsing the program aguments.
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if (arguments.errors())
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{
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arguments.writeErrorMessages(std::cout);
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return 1;
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}
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// create a model from the images.
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osg::Node* rootNode = createModel((arguments.argc() > 1 ? arguments[1] : "Images/lz.rgb"));
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// add model to viewer.
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viewer.setSceneData(rootNode);
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// create the windows and run the threads.
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viewer.realize();
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while (!viewer.done())
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{
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// wait for all cull and draw threads to complete.
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viewer.sync();
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// update the scene by traversing it with the the update visitor which will
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// call all node update callbacks and animations.
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viewer.update();
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// fire off the cull and draw traversals of the scene.
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viewer.frame();
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}
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// wait for all cull and draw threads to complete.
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viewer.sync();
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// run a clean up frame to delete all OpenGL objects.
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viewer.cleanup_frame();
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// wait for all the clean up frame to complete.
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viewer.sync();
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return 0;
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}
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