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POOpenSceneGraph float Image
 

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    <p>Using C++ and OSG I'm trying to upload a float texture to my shader, but somehow it does not seem to work. At the end I posted some part of my code. Main question is how to create an osg::Image object using data from a float array. In OpenGL the desired code would be</p> <pre><code>glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE32F_ARB, width, height, 0, GL_LUMINANCE, GL_FLOAT, data); </code></pre> <p>but in this case I have to use OSG.</p> <p>The code runs fine when using </p> <pre><code>Image* image = osgDB::readImageFile("someImage.jpg"); </code></pre> <p>instead of </p> <pre><code>image = new Image; </code></pre> <p>but I need to upload generated float data. It's also not possible to switch to unsigned char arrays as I need the GL_LUMINANCE32F_ARB data range in the shader code.</p> <p>I hope someone can help me here as Google couldn't help me with it (googled for eg: osg float image). So here's my code.</p> <pre><code>using namespace std; using namespace osg; //... float* data = new float[width*height]; fill_n(data, size, 1.0); // &lt;&lt; I actually do this for testing purposes Texture2D* texture = new Texture2D; Image* image = new Image; osg::State* state = new osg::State; Uniform* uniform = new Uniform(Uniform::SAMPLER_2D, "texUniform"); texture-&gt;setInternalFormat(GL_LUMINANCE32F_ARB); texture-&gt;setDataVariance(osg::Object::DYNAMIC); texture-&gt;setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR); texture-&gt;setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR); texture-&gt;setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP_TO_EDGE); texture-&gt;setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP_TO_EDGE); if (data == NULL) cout &lt;&lt; "texdata null" &lt;&lt; endl; // &lt;&lt; this is not printed image-&gt;setImage(width, height, 1, GL_LUMINANCE32F_ARB, GL_LUMINANCE, GL_FLOAT, (unsigned char*)data, osg::Image::USE_NEW_DELETE); if (image-&gt;getDataPointer() == NULL) cout &lt;&lt; "datapointernull" &lt;&lt; endl; // &lt;&lt; this is printed if (!image-&gt;valid()) exit(1); // &lt;&lt; here the code exits (hard exit just for testing purposes) osgDB::writeImageFile(*image, "blah.png"); texture-&gt;setInternalFormat(GL_LUMINANCE32F_ARB); texture-&gt;setImage(image); camera-&gt;getOrCreateStateSet()-&gt;setTextureAttributeAndModes(4, texture); state-&gt;setActiveTextureUnit(4); texture-&gt;apply(*state); uniform-&gt;set(4); addProgrammUniform(uniform); </code></pre> <p>I found another way on the web, letting osg::Image create the data and fill it afterwards. But somehow this also does not work. I inserted this just after the new XYZ; lines.</p> <pre><code>image-&gt;setInternalTextureFormat(GL_LUMINANCE32F_ARB); image-&gt;allocateImage(width,height,1,GL_LUMINANCE,GL_FLOAT); if (image-&gt;data() == NULL) cout &lt;&lt; "null here?!" &lt;&lt; endl; // &lt;&lt; this is printed. </code></pre>
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    1. COSurely that should either be `Image image;` or `Image *image = new Image`. That same goes for `state`, `uniform` and the like. Does your code even compile?
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    2. COOops, yes, you're right. The code was taken from my class where texture, image, state and uniform are defined in the header as pointers. I just forgot the * when adding the types in that snippet. I'll correct that. Thanks
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    3. COI added one more way I found to solve the problem, but this also does not work. Although allocateImage(.) is just called the data pointer is NULL.
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