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Sample code for vertex arrays
by markb＠parkcity.ne.jp 28 Apr '13

28 Apr '13

Can anyone provide sample code using vertex arrays? The program varray.lisp in the redbook examples uses these but things like gl:vertex-pointer do not appear to be exported into the cl-opengl package.

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by Au Fil du Bain 12 Apr '13

12 Apr '13

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by David 11 Apr '13

11 Apr '13

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11 Apr '13

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11 Apr '13

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[cl-opengl-devel] slow interpolation issues
by cage 11 Mar '13

11 Mar '13

Hello, I have written an MD2 3d mesh loader, everything works fine except for the animations. Because the model save only the key frame for each animation the loader must interpolate the vertex position of the mesh to get a smooth animation. My solution was to save the triangles vertices in a gl-array for each frame an then doing linear interpolation, something like that: (defun lerp-gl-array (a b c count interpolation-factor) (dotimes (i count) (setf (gl:glaref c i) (alexandria:lerp interpolation-factor (gl:glaref a i) (gl:glaref b i))))) but it seem to be too slow as shown by the SBCL profiler seconds | gc | consed | calls | sec/call | name ----------------------------------------------------------- 264.554 | 8.189 | 8,307,049,792 | 2,870 | 0.092179 | CL-GL-UTILS:LERP-GL-ARRAY ----------------------------------------------------------- 264.554 | 8.189 | 8,307,049,792 | 2,870 | | Total is this my fault? Any idea how can I improve performance? Thank you. C. -- source code published is licensed under the "Simplified BSD License"

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[cl-opengl-devel] glop
by Luís Oliveira 28 Jan '13

28 Jan '13

Hello, This project is potentially interesting for cl-opengl users: <https://github.com/patzy/glop>. Has anybody tried it out? Cheers, -- Luís Oliveira http://r42.eu/~luis/

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[cl-opengl-devel] package "GL" not found
by Nick Khamis 28 Dec '12

28 Dec '12

Hello Everyone, My current environment consists of (Emacs, SBCL, ASDF, and SLIME). Trying to run a few minimalistic examples I keep getting: package "GL" not found Things I have done to try to make ASDF central registry aware of the cl-opengl implementation: #~/.sbclrc ;;; asdf-prep.lisp (dolist (subdir (list ;; ... some other packages ... #P"cl-opengl/")) (push (merge-pathnames subdir #P"/usr/local/tools/") asdf:*central-registry*)) And in the code I added: (require :asdf) ; need ASDF to load other things (asdf:load-system :cl-opengl) ; load OpenGL bindings (asdf:load-system :cl-glu) ; load GLU bindings (asdf:load-system :cl-glut) ; load GLUT bindings I have heard of quicklisp however, trying to understand how environment variables work, and would like to get it going with this minimalistic setup first if possible. Your help is greatly appreciated, Nick.

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[cl-opengl-devel] cl-glut not able to open windows until shown how by lispbuilder-sdl
by Zach Hall 07 Aug '12

07 Aug '12

Hi everyone, I'm having a weird problem with cl-glut. When I run something using glut to produce a window, I don't get a window. Inserting a swank-handler into the loop of the examples, I determined that they WERE running, they just weren't giving me a window. I'm using Windows 7, Clozure-CL and I have FreeGlut loaded and detected properly. Everything works, except that the window doesn't show. So! I decided to try Lispbuilder-SDL, I loaded up their examples and they are able to successfully open windows. What's really odd about this, is that AFTER I've created a window using Lispbuilder, it seems to show Glut what to do, and Glut can suddenly open display windows properly. Does anyone have any idea what could be causing this?

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Re: [cl-opengl-devel] How to install/run the demo code? Successful.
by John Crawford 04 Aug '12

04 Aug '12

> You need FreeGLUT rather than classic GLUT. Thanks, that was the last piece of the puzzle. For the record, the entire set of steps I went through was: File->Load-> C:\Lisp\Tools\quicklisp.lisp - only needs to be done once. or CL-USER 1 : 1 > (load #p"C:/Lisp/Tools/quicklisp.lisp") CL-USER 1 : 1 > (quicklisp-quickstart:install) - only needs to be done once. CL-USER 2 > (load #p"c:/documents and settings/username/quicklisp/setup.lisp") needs to be done every time in LispWorks Personal Edition, which doesn't support init files. CL-USER 3 : 1 > (ql:quickload :cl-opengl) CL-USER 4 : 1 > (ql:quickload :cl-glut-examples) CL-USER 5 : 1 > (cl-glut-examples:list-examples) CL-USER 6 : 1 > (cl-glut-examples:gears)

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