July 2007 - HOpenGL - Haskell.org

Bug (typo) in Graphics.UI.GLUT.Begin
by Dave Tapley 31 Jul '07

31 Jul '07

Hi all, Sorry if this is known; I searched the achieves but nothing came up. I just noticed that one of the constructors for the data type ActionOnWindowClose, namely ContinueExectuion contains an incorrect spelling of execution as 'exectuion'. As shown here: http://haskell.org/ghc/docs/latest/html/libraries/GLUT/Graphics-UI-GLUT-Beg… My ghc-pkg reports version: GLUT-2.0 Dave,

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"can't load .so/.dll for: glut32 (addDll: unknown error)"
by Hugh Perkins 23 Jul '07

23 Jul '07

Hi, Kindof a dumb question I know, what do I need to do to avoid getting the following message when I try loading GLUT? J:\dev\haskell>ghci -fglasgow-exts Teapots.hs ___ ___ _ / _ \ /\ /\/ __(_) / /_\// /_/ / / | | GHC Interactive, version 6.6.1, for Haskell 98. / /_\\/ __ / /___| | http://www.haskell.org/ghc/ \____/\/ /_/\____/|_| Type :? for help. Loading package base ... linking ... done. Ok, modules loaded: Main. Prelude Main> main Loading package OpenGL-2.2.1 ... linking ... done. Loading package GLUT-2.1.1 ... can't load .so/.DLL for: glut32 (addDLL: unknown error) As you can see, running ghc 6.6.1, on Windows.

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Set polygon mode?
by Hugh Perkins 23 Jul '07

23 Jul '07

Hi, question, how do I do "Gl.glPolygonMode(Gl.GL_BACK, Gl.GL_LINE);" in HOpenGl? Maybe something like "polygonMode $= (Line,Line)" ? (By the way, what does "$=" do?)

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Compiling hopengl apps?
by Hugh Perkins 21 Jul '07

21 Jul '07

Started to play with hopengl. It's pretty cool :-) Very easy to use, quite cool :-) Started to look at perf. What interests me most is to see how fast we can make vertex3f calls. Basically, we're testing the speed of the haskell/c boundary, where security(?) and marshalling are going to occur. Yes, we can send the vertices to a vertexarray and not have to handle vertex3f calls, but that's not what I want to measure ;-) So, have a really rough and ready application that draws 45000 triangles a frame, then measures the framerate. Thats about 150,000 calls to vertex3f per frame. The application runs in Java, C#, and now Haskell. Running in ghci, this runs at about 1.5 fps, really ballpark, havent checked I'm really drawing the number of triangles I think I'm drawing, or settings such as backface-culling or shademodel. That's not too bad. I'd like to compile to an executable to increase the framerate, but it's giving me the following output: J:\dev\haskell>ghc -fglasgow-exts -O2 -o OglPerf.exe OglPerf.hs OglPerf.o(.text+0x1f4):ghc3668_0.hc: undefined reference to `glutPostRedisplay@0 ' OglPerf.o(.text+0x255):ghc3668_0.hc: undefined reference to `glVertex3f@12' OglPerf.o(.text+0x1148):ghc3668_0.hc: undefined reference to `glViewport@16' OglPerf.o(.text+0x1157):ghc3668_0.hc: undefined reference to `glMatrixMode@4' OglPerf.o(.text+0x115f):ghc3668_0.hc: undefined reference to `glLoadIdentity@0' OglPerf.o(.text+0x11cc):ghc3668_0.hc: undefined reference to `glFrustum@48' OglPerf.o(.text+0x11db):ghc3668_0.hc: undefined reference to `glMatrixMode@4' OglPerf.o(.text+0x11e3):ghc3668_0.hc: undefined reference to `glLoadIdentity@0' OglPerf.o(.text+0x11fd):ghc3668_0.hc: undefined reference to `glTranslatef@12' OglPerf.o(.text+0x1672):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziVertexSpec_Vertex3_con_info' OglPerf.o(.text+0x1764):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziVertexSpec_Vertex3_con_info' OglPerf.o(.text+0x1856):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziVertexSpec_Vertex3_con_info' OglPerf.o(.text+0x1948):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziVertexSpec_Vertex3_con_info' OglPerf.o(.text+0x1b56):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziPrimitiveMode_Quads_closure' OglPerf.o(.text+0x1de9):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziFramebuffer_marshalClearBuffer_closure' OglPerf.o(.text+0x1e00):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziFramebuffer_sum_closure' OglPerf.o(.text+0x1e42):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziFramebuffer_sum_closure' [...] aphicsziRenderingziOpenGLziGLziStringQueries_Vendor_closure' OglPerf.o(.text+0x340f):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziStringQueries_Renderer_closure' OglPerf.o(.text+0x3634):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziBasicTypes_Enabled_closure' OglPerf.o(.text+0x3668):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziCoordTrans_normalizze_closure' OglPerf.o(.text+0x36c1):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziBasicTypes_Enabled_closure' OglPerf.o(.text+0x3716):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziBasicTypes_Enabled_closure' OglPerf.o(.text+0x374a):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziColors_lighting_closure' [...] collect2: ld returned 1 exit status What am I missing?

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Segfaults on MouseWheel
by Hendrik Iben 21 Jul '07

21 Jul '07

Hi, I've been experimenting some time with the OpenGL and GLUT bindings and there is one thing I do not understand. While I've read trough the archive and understand that the GLUT binding cannot handle more than the standard Mouse-buttons I thought handling the MouseWheel-buttons should work. However, regardless of whether I actually want to know about Mouse-Buttons my applications segfault when I trigger the WheelUp-Button. WheelDown works as expected (They are reported as button 4 and 5 in X). I don't know where that behaviour comes from - other buttons at least give an error message about the missing marshalling. I guess something is wrong with my setup as I could not find any similar error report (AMD64, linux kernel 2.6.19 (64bit), X.org 7.2, GHC 6.6.1, GLUT 2.1.1, OpenGL-2.2.1). Any suggestions how to further investigate this ? I'm willing to add hooks to the GLUT (?) package if someone can point me to the right direction... This is the output from doing a backtrace on the dumped core - not very informative... : #0 0x0000000000000000 in ?? () #1 0x00002b6f40ccd172 in __glutRegisterEventParser () from /usr/lib/libglut.so.3 #2 0x00002b6f40ccdeb2 in glutMainLoop () from /usr/lib/libglut.so.3 #3 0x0000000000411c08 in GLUTzm2zi1zi1_GraphicsziUIziGLUTziBegin_mainLoop_info () #4 0x000000000057b498 in stg_ap_0_fast () #5 0x0000000000529b98 in s5YF_info () #6 0x00002aaaaac8eaf8 in ?? () #7 0x00000000007c89d0 in ?? () #8 0x0000000000000000 in ?? () Best regards, Hendrik

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Re: [Haskell-cafe] Looking for final year project - using Haskell, or another functional language
by Claus Reinke 14 Jul '07

14 Jul '07

>I've already sent an email to the haskell.org admin requesting that >/HOpenGL be made publically unviewable. > >Stefan in the interim, there's now a bare-bones wiki page: http://www.haskell.org/haskellwiki/Opengl quite dreary, but at least visitors will no longer thing that the binding should be "upgraded" to OpenGL 1.3, or wonder where the sources are, or whether there are any examples that build with those sources.. while Sven keeps improving the implementation, perhaps others can help out improving that entry page. some fancy success stories, up-to-date tutorials, applications, libraries (a binding for text perhaps?-). claus

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