Hi Carl-Fredrik, > The persistence is more than just esthetics, it allows you to detect > spurious anomalies since the little short deviation stays on screen > long enough to be detected, if an oscilloscope doesn’t have > persistence and at the same time don’t render all frames you could > miss important information.
Yeah sure, though using an OpenGL output is not a requirement for persistence. > I understand the hesitation to use OPENGL or OPENGL-ES but > realistically what device could you think of that doesn’t have h/w > support for GL-Shaders that would run an oscilloscope application? I'm thinking of Android tablets, though I don't really know how many are out there who lack 3D acceleration. I do however know that using it drains the battery more than not using it. My personal dislike towards OpenGL is that I'm not aquainted with t (I want to learn, don't get me wrong, I just don't have the time to do so) and that I have the gut feeling that it'll be difficult to obtain pixel-perfect line output. All the best, -Soeren > Regards // CF > > Hi Carl-Fredrik, > > > I think that if you want to start doing oscilloscope functionality > it > > would have to be more realtime? > > Of course, though any (decent) scope attached via USB 2 or better > should be able to produce data faster than we humans can process it, > so drawing every single received frame isn't a hard requirement imo. > > > > Wouldn’t it be an idea to use opengl for rendering in those cases > and > > implement persistence > > in shader language. > > > > I saw this demo persistence demo and wondered if something like > that > > could be implemented > > > > http://m1el.github.io/woscope-how/ > > Well sure, it looks great. To me personally, there are three issues > here, though: > 1) electron beam scopes are beautiful but outdated. To me, > precision is more important than beauty. And we can do beauty in > PV, too, using antialiasing and when desired, interpolation. > > 2) I don't want PV to be limited to devices with GL/shader support. > > 3) drawing static lines/text/glyphs *may* be more complicated when > using a GL view, I don't know. But if it is, the additional effort > isn't something I'm willing to spend time on in the foreseeable > future. > > So yes, looks nice, but imo it won't happen for PV anytime soon, > sorry. > > All the best, > -Soeren > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ sigrok-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/sigrok-devel
