Hello Robert,
I have found a bug when assigning a new image to an existing texture
that already has an OpenGL texture object allocated. The problem appears
to be that Texture2D::apply is passing the wrong dimensions in to
applyTexImage2D_subload. Since the dimensions of the image don't match
the dimensions of the existing OpenGL texture object, subloading
shouldn't even be used. I therefore get the following error printed out
on the console:
Warning: detected OpenGL error 'invalid value' after RenderBin::draw(,)
The dimensions of the Texture::TextureObject should be validated against
the data being loaded before calling subload, probably in the
Texture*::apply methods.
Mark
#include <osg/Texture2D>
#include <osg/Geometry>
#include <osgViewer/Viewer>
#include <osgGA/TrackballManipulator>
int main()
{
osg::ref_ptr<osg::Texture2D> texture1 = new osg::Texture2D;
static unsigned char bytes[16] = {
0xff, 0x00, 0x00, 0xff,
0x00, 0xff, 0x00, 0xff,
0x00, 0x00, 0xff, 0xff,
0xff, 0x00, 0xff, 0xff,
};
osg::ref_ptr<osg::Image> imageRGB = new osg::Image;
imageRGB->setImage(3, 1, 1, GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, &bytes[0],
osg::Image::NO_DELETE, 1);
osg::ref_ptr<osg::Image> imageRed = new osg::Image;
imageRed->setImage(1, 1, 1, GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, &bytes[0],
osg::Image::NO_DELETE, 1);
osg::ref_ptr<osg::Image> imageGreen = new osg::Image;
imageGreen->setImage(1, 1, 1, GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE,
&bytes[4], osg::Image::NO_DELETE, 1);
osg::ref_ptr<osg::Image> imageBlue = new osg::Image;
imageBlue->setImage(1, 1, 1, GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE,
&bytes[8], osg::Image::NO_DELETE, 1);
osg::ref_ptr<osg::Geode> geode = new osg::Geode();
osg::ref_ptr<osg::Geometry> geom = new osg::Geometry();
geode->addDrawable(geom.get());
osg::ref_ptr<osg::Vec3Array> pVertices = new osg::Vec3Array;
pVertices->push_back( osg::Vec3(0, 0, 0) );
pVertices->push_back( osg::Vec3(0, 0, 1) );
pVertices->push_back( osg::Vec3(1, 0, 1) );
pVertices->push_back( osg::Vec3(1, 0, 0) );
geom->setVertexArray(pVertices.get());
osg::ref_ptr<osg::Vec2Array> pTexCoords = new osg::Vec2Array;
pTexCoords->push_back( osg::Vec2(0, 0) );
pTexCoords->push_back( osg::Vec2(0, 1) );
pTexCoords->push_back( osg::Vec2(1, 1) );
pTexCoords->push_back( osg::Vec2(1, 0) );
geom->setTexCoordArray(0, pTexCoords.get());
osg::ref_ptr<osg::DrawArrays> pDrawArrays = new osg::DrawArrays(GL_QUADS,
0, 4);
geom->addPrimitiveSet(pDrawArrays.get());
osg::StateSet* stateset = new osg::StateSet();
stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
stateset->setTextureAttributeAndModes(0, texture1.get(),
osg::StateAttribute::ON);
geode->setStateSet( stateset );
texture1->setImage(imageGreen.get());
texture1->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
texture1->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
texture1->setResizeNonPowerOfTwoHint(false);
texture1->setFilter( osg::Texture::MAG_FILTER, osg::Texture::NEAREST );
texture1->setFilter( osg::Texture::MIN_FILTER, osg::Texture::NEAREST );
osg::ref_ptr<osgViewer::Viewer> viewer1 = new osgViewer::Viewer;
osg::ref_ptr<osgViewer::Viewer> viewer2 = new osgViewer::Viewer;
viewer1->setUpViewInWindow(20, 50, 200, 200);
viewer2->setUpViewInWindow(240, 300, 200, 200);
viewer1->setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
viewer2->setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
viewer1->setSceneData( geode.get() );
viewer2->setSceneData( geode.get() );
viewer1->setCameraManipulator(new osgGA::TrackballManipulator());
viewer2->setCameraManipulator(new osgGA::TrackballManipulator());
int nFrame = 0;
while( viewer1.get() || viewer2.get() )
{
if( viewer1.get() )
{
if( !viewer1->done() )
viewer1->frame();
else
viewer1 = 0;
}
texture1->setImage(imageRGB.get());
if( viewer2.get() )
{
if( !viewer2->done() )
viewer2->frame();
else
viewer2 = 0;
}
++nFrame;
}
return 0;
}
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