Folks,
I'm having trouble figuring out how to render floating point values to a
texture and then reading them back from the card for use in my app. I can
get byte values to work fine.
Any help would be appreciated.
Thanks,
Brian
Here's a summary of what I'm doing:
texture setup
osg::TextureRectangle* texture = new osg::TextureRectangle;
texture->setTextureSize(tex_width, tex_height);
texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
texture->setInternalFormat(GL_RGBA16F_ARB);
texture->setSourceFormat(GL_RGBA);
texture->setSourceType(GL_FLOAT);;
rtt camera setup
camera->attach(osg::Camera::COLOR_BUFFER, texture);
camera->setRenderOrder(osg::Camera::PRE_RENDER);
camera->setRenderTargetImplementation(osg::Camera::PIXEL_BUFFER);
//camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
camera callback setup
osg::Image* image = new osg::Image;
image->allocateImage(tex_width, tex_height, 1, GL_RGBA, GL_FLOAT);
camera->setPostDrawCallback(new MyCameraPostDrawCallback(image));;
camera callback
const osg::Viewport * vp = camera.getViewport();
_image->readPixels((int)vp->x(), (int)vp->y(), (int)vp->width(),;;
(int)vp->height(), GL_RGBA, GL_FLOAT);
osgDB::writeImageFile(*_image,"imagexxx.png");
or write raw data and read from another app;
std::ofstream fout("imagexxx.raw",std::ios::binary);
fout.write((char *)_image->data(),_image->getImageSizeInBytes());
fout.close();
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