Hi,
Extremely sorry for my first question as I was not reading the image file
properly, I couldn't get the display as I thought. But regarding my 2nd
question, I m taking a buffer(filled with image pixels) of size exactly
equivalent to of my screen resolution (1280 * 960). I m trying to display it
in such a way to exactly fit onto my screen without scaling down/up. I put my
code to show the way I create the texture,
osg::Node* CreateTexImage()
{
osg::BoundingBox bb(0.0f,0.0f,0.0f,1.0f,1.0f,1.0f);
osg::Group* group = new osg::Group;
osg::Vec3 top_left(bb.xMin(),bb.yMin(),bb.zMax());
osg::Vec3 bottom_left(bb.xMin(),bb.yMin(),bb.zMin());
osg::Vec3 bottom_right(bb.xMin(),bb.yMax(),bb.zMin());
osg::Vec3 top_right(bb.xMin(),bb.yMax(),bb.zMax());
osg::Vec3
center(bb.xMin(),(bb.yMin()+bb.yMax())*0.5f,(bb.zMin()+bb.zMax())*0.5f);
float height = bb.zMax()-bb.zMin();
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,1.0f);
(*texcoords)[1].set(0.0f,0.0f);
(*texcoords)[2].set(1.0f,0.0f);
(*texcoords)[3].set(1.0f,1.0f);
geom->setTexCoordArray(0,texcoords);
osg::Vec3Array* normals = new osg::Vec3Array(1);
(*normals)[0].set(1.0f,0.0f,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));
osg::Geode* geom_geode = new osg::Geode;
geom_geode->addDrawable(geom);
group->addChild(geom_geode);
osg::Texture2D* texture = new osg::Texture2D;
texture->setDataVariance(osg::Object::DYNAMIC);
unsigned char* data;
int width, height;
width=1280; //source_image width
height=960;//source_image height
long size = width * height;
data = new unsigned char[size];
//Reading Image of width * height into buffer
for(i=0;i<(width * height); i++)
data[i]=source_image[i]);
//Setting image
osg::ref_ptr<osg::Image> image = new osg::Image;
image->allocateImage(width, height, 1, GL_LUMINANCE, GL_UNSIGNED_BYTE);
image->setOrigin(osg::Image::BOTTOM_LEFT);
image->setImage(width, height, 1, GL_LUMINANCE, GL_LUMINANCE,
GL_UNSIGNED_BYTE,data, osg::Image::NO_DELETE);
texture->setImage(image);
osg::StateSet* stateset = geom->getOrCreateStateSet();
stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
return group;
}
Let me understand what needs to be done to fit onto my screen exaxtly without
scaling?
Thanks
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=25525#25525
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