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