Re: [Haskell-cafe] OpenGL Speed!
Vo Minh Thu schrieb: There other possibilities to deal with raster graphics: - Use gtk; i.e. something like http://hackage.haskell.org/package/AC-EasyRaster-GTK - Output the data in some image format (if you want to do it yourself, the most simple is PPM) - Use X11 directly (if you're on unix) - ... or good old HGL: http://hackage.haskell.org/package/HGL ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] OpenGL Speed!
On Fri, 30 Jul 2010, Eitan Goldshtrom wrote: HGL actually looks like EXACTLY what I need. I only need to set pixels, which looks like just what HGL would be good at. Only problem is that I can't find a single tutorial for HGL. Does anyone know or any, or where I could find one? I found the Haddock documentation enough for what I tried. Maybe my example can help you: http://hackage.haskell.org/package/hgl-example ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] OpenGL Speed!
HGL actually looks like EXACTLY what I need. I only need to set pixels, which looks like just what HGL would be good at. Only problem is that I can't find a single tutorial for HGL. Does anyone know or any, or where I could find one? -Eitan On 7/30/2010 12:22 PM, Henning Thielemann wrote: Vo Minh Thu schrieb: There other possibilities to deal with raster graphics: - Use gtk; i.e. something like http://hackage.haskell.org/package/AC-EasyRaster-GTK - Output the data in some image format (if you want to do it yourself, the most simple is PPM) - Use X11 directly (if you're on unix) - ... or good old HGL: http://hackage.haskell.org/package/HGL ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] OpenGL Speed!
I'm having an unusual problem with OpenGL. To be honest I probably shouldn't be using OpenGL for this, as I'm just doing 2D and only drawing Points, but I don't know about any other display packages, so I'm making due. If this is a problem because of OpenGL however, then I'll have to learn another package. The problem is speed. I have a list of points representing the color of 800x600 pixels. All I'm trying to do is display the pixels on the screen. I use the following: renderPrimitive Points $ mapM_ display list flush where display [] = return () display ((x,y,i):n) = do color $ Color3 i i i vertex $ Vertex2 x y display n But, for some reason this takes FOREVER. I don't know how to use debugging hooks yet without an IDE -- and I don't use an IDE -- but I used a cleverly placed putStrLn to see that it was actually working, just really really slowly. Is there a solution to this speed problem or should I use a package that's more suited to 2D applications like this? Also, if I should use another package, are there any suggestions for which to use? Thanks for any help. -Eitan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] OpenGL Speed!
2010/7/29 Eitan Goldshtrom thesource...@gmail.com: I'm having an unusual problem with OpenGL. To be honest I probably shouldn't be using OpenGL for this, as I'm just doing 2D and only drawing Points, but I don't know about any other display packages, so I'm making due. If this is a problem because of OpenGL however, then I'll have to learn another package. The problem is speed. I have a list of points representing the color of 800x600 pixels. All I'm trying to do is display the pixels on the screen. I use the following: renderPrimitive Points $ mapM_ display list flush where display [] = return () display ((x,y,i):n) = do color $ Color3 i i i vertex $ Vertex2 x y display n But, for some reason this takes FOREVER. I don't know how to use debugging hooks yet without an IDE -- and I don't use an IDE -- but I used a cleverly placed putStrLn to see that it was actually working, just really really slowly. Is there a solution to this speed problem or should I use a package that's more suited to 2D applications like this? Also, if I should use another package, are there any suggestions for which to use? Thanks for any help. Hi, Although you can use Vertex* to put a single Point on the screen, it is not meant to be used as some kind of setPixel function. If your goal is simply to set pixels' value of a raster, you can still use OpenGL but should use a single textured quad (and thus manipulate the texture's pixels). There other possibilities to deal with raster graphics: - Use gtk; i.e. something like http://hackage.haskell.org/package/AC-EasyRaster-GTK - Output the data in some image format (if you want to do it yourself, the most simple is PPM) - Use X11 directly (if you're on unix) - ... HTH, Thu ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] OpenGL Speed!
Yeah, using openGL Points to draw 2D images will probably be pretty slow. However, if you don't need to change your points every frame, a display list might improve the speed quite a bit (you could still transform the points as a whole). Also, you could try the SDL bindings for haskell: http://hackage.haskell.org/package/SDL SDL is better suited for 2D drawing (IMHO). http://www.libsdl.org/ - Job On Thu, Jul 29, 2010 at 6:51 AM, Vo Minh Thu not...@gmail.com wrote: 2010/7/29 Eitan Goldshtrom thesource...@gmail.com: I'm having an unusual problem with OpenGL. To be honest I probably shouldn't be using OpenGL for this, as I'm just doing 2D and only drawing Points, but I don't know about any other display packages, so I'm making due. If this is a problem because of OpenGL however, then I'll have to learn another package. The problem is speed. I have a list of points representing the color of 800x600 pixels. All I'm trying to do is display the pixels on the screen. I use the following: renderPrimitive Points $ mapM_ display list flush where display [] = return () display ((x,y,i):n) = do color $ Color3 i i i vertex $ Vertex2 x y display n But, for some reason this takes FOREVER. I don't know how to use debugging hooks yet without an IDE -- and I don't use an IDE -- but I used a cleverly placed putStrLn to see that it was actually working, just really really slowly. Is there a solution to this speed problem or should I use a package that's more suited to 2D applications like this? Also, if I should use another package, are there any suggestions for which to use? Thanks for any help. Hi, Although you can use Vertex* to put a single Point on the screen, it is not meant to be used as some kind of setPixel function. If your goal is simply to set pixels' value of a raster, you can still use OpenGL but should use a single textured quad (and thus manipulate the texture's pixels). There other possibilities to deal with raster graphics: - Use gtk; i.e. something like http://hackage.haskell.org/package/AC-EasyRaster-GTK - Output the data in some image format (if you want to do it yourself, the most simple is PPM) - Use X11 directly (if you're on unix) - ... HTH, Thu ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] OpenGL Speed!
If you still want to use glVertex with GL_POINTS, instead of a display list, you'd better go with vertex array or VBO. But still, if the implicit coordinates of a raster is assumed, pairing the coordinates with their value is overkill. Cheers, Thu 2010/7/29 Job Vranish job.vran...@gmail.com: Yeah, using openGL Points to draw 2D images will probably be pretty slow. However, if you don't need to change your points every frame, a display list might improve the speed quite a bit (you could still transform the points as a whole). Also, you could try the SDL bindings for haskell: http://hackage.haskell.org/package/SDL SDL is better suited for 2D drawing (IMHO). http://www.libsdl.org/ - Job On Thu, Jul 29, 2010 at 6:51 AM, Vo Minh Thu not...@gmail.com wrote: 2010/7/29 Eitan Goldshtrom thesource...@gmail.com: I'm having an unusual problem with OpenGL. To be honest I probably shouldn't be using OpenGL for this, as I'm just doing 2D and only drawing Points, but I don't know about any other display packages, so I'm making due. If this is a problem because of OpenGL however, then I'll have to learn another package. The problem is speed. I have a list of points representing the color of 800x600 pixels. All I'm trying to do is display the pixels on the screen. I use the following: renderPrimitive Points $ mapM_ display list flush where display [] = return () display ((x,y,i):n) = do color $ Color3 i i i vertex $ Vertex2 x y display n But, for some reason this takes FOREVER. I don't know how to use debugging hooks yet without an IDE -- and I don't use an IDE -- but I used a cleverly placed putStrLn to see that it was actually working, just really really slowly. Is there a solution to this speed problem or should I use a package that's more suited to 2D applications like this? Also, if I should use another package, are there any suggestions for which to use? Thanks for any help. Hi, Although you can use Vertex* to put a single Point on the screen, it is not meant to be used as some kind of setPixel function. If your goal is simply to set pixels' value of a raster, you can still use OpenGL but should use a single textured quad (and thus manipulate the texture's pixels). There other possibilities to deal with raster graphics: - Use gtk; i.e. something like http://hackage.haskell.org/package/AC-EasyRaster-GTK - Output the data in some image format (if you want to do it yourself, the most simple is PPM) - Use X11 directly (if you're on unix) - ... HTH, Thu ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] OpenGL Speed!
Yep, no surprise there. I would suggest using bitmap[1] to construct your bitmap, and bitmap-opengl to put it into an OpenGL texture and draw it on a textured quad. I think OpenGL is actually an OK choice for this application, because it is the most portable graphics method we have available. If you are trying to redraw in realtime, eg. 30 FPS or so, I don't think you're going to be able to. There is just not enough GPU bandwidth (and probably not enough CPU) for that (unless you write it in a pixel shader, which IIRC haskell has some neat tools for, but I don't remember). If this is the case, see if you can boil down what you have into something that doesn't require so much data, e.g. polygons. [1] http://hackage.haskell.org/package/bitmap [2] http://hackage.haskell.org/package/bitmap-opengl On Thu, Jul 29, 2010 at 3:57 AM, Eitan Goldshtrom thesource...@gmail.com wrote: I'm having an unusual problem with OpenGL. To be honest I probably shouldn't be using OpenGL for this, as I'm just doing 2D and only drawing Points, but I don't know about any other display packages, so I'm making due. If this is a problem because of OpenGL however, then I'll have to learn another package. The problem is speed. I have a list of points representing the color of 800x600 pixels. All I'm trying to do is display the pixels on the screen. I use the following: renderPrimitive Points $ mapM_ display list flush where display [] = return () display ((x,y,i):n) = do color $ Color3 i i i vertex $ Vertex2 x y display n But, for some reason this takes FOREVER. I don't know how to use debugging hooks yet without an IDE -- and I don't use an IDE -- but I used a cleverly placed putStrLn to see that it was actually working, just really really slowly. Is there a solution to this speed problem or should I use a package that's more suited to 2D applications like this? Also, if I should use another package, are there any suggestions for which to use? Thanks for any help. -Eitan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] OpenGL Speed!
On 2010-07-29 11:30 -0600, Luke Palmer wrote: If you are trying to redraw in realtime, eg. 30 FPS or so, I don't think you're going to be able to. There is just not enough GPU bandwidth (and probably not enough CPU). Updating an 800x600 texture at 30fps on a somewhat modern system is absolutely *not* a problem. -- Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/) ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
