Am 29.08.2014 um 11:28 schrieb Fabrizio Bazzurri <[email protected]>:
> Hi,
>
> I'm having a problem in my custom shader while updating my texture2D using
> image->dirty() function. Following there is the relevant code snippet.
>
>
> Code:
>
> osg::StateSet* stateset = geom1->getOrCreateStateSet();
>
> osg::ref_ptr<osg::Program> program = new osg::Program;
> osg::ref_ptr<osg::Shader> vertexSource = new osg::Shader(osg::Shader::VERTEX);
> osg::ref_ptr<osg::Shader> fragmentSource = new
> osg::Shader(osg::Shader::FRAGMENT);
>
> vertexSource->setShaderSource(vert);
> fragmentSource->setShaderSource(frag);
>
> program->addShader(vertexSource);
> program->addShader(fragmentSource);
>
> stateset->setAttributeAndModes(program.get());
> stateset->setDataVariance(osg::Object::DYNAMIC);
>
> ////
> osg::ref_ptr<osg::Image> diffuseImage = osgDB::readImageFile(".\\img0.png");
> std::cout << " File " << diffuseImage->getFileName() << " " << std::endl; //
> it prints img0
>
> osg::ref_ptr<osg::Texture2D> diffuseTex = new osg::Texture2D;
> diffuseTex->setDataVariance(osg::Object::DYNAMIC);
> diffuseTex->setImage(diffuseImage.get());
>
> stateset->setTextureAttributeAndModes(0, diffuseTex.get(),
> osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
>
> osg::ref_ptr<osg::Uniform> cDiffTex = new
> osg::Uniform(osg::Uniform::SAMPLER_2D, "cDiffTex");
> cDiffTex->set(0);
> stateset->addUniform(cDiffTex.get());
>
Here you create a new image, your texture refers still to the old one. Load the
file into a second image and copy the data into your diffuseImage. Compare the
pointer of texture->getImage and diffuseImage, they point to different objects.
> diffuseImage = osgDB::readImageFile(".\\img1.jpg");
> diffuseImage->dirty();
> std::cout << " File " << diffuseImage->getFileName() << " " << std::endl; //
> it prints img1->GOOD the diffuseImage is updated
> std::cout << " Tex " << diffuseTex->getImage()->getFileName() << " " <<
> std::endl; // it prints img0->BAD the image object of texture is not updated
> // NEED TO TELL TEXTURE TO SET THE IMAGE TO HAVE IT UPDATED
> //diffuseTex->setImage(diffuseImage);
> //std::cout << " Tex " << diffuseTex->getImage()->getFileName() << " " <<
> std::endl;
>
Ressource-wise it’s better to have one texture holding one image as using
multiple textures using one image.
cheers,
Stephan
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