cl-opengl-devel

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January 2007

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2 discussions

[cl-opengl-devel] generating function bindings, extension loading
by Bart Botta 11 Mar '07

11 Mar '07

I've been working on generating bindings from the .spec files on opengl.org, and it seems to be to the point where it could be turned into a patch... Before that though, I wanted to get some feedback about changing the naming for the bindings: First suggestion is moving the function bindings to a separate package, and giving them lisp style names, so people like me who want to use them directly have supported access to them. Second is changing the GLenums from cffi:defcenums to defconstants. Advantages I can think of from doing that: *Easier for users to add enums from a new extension without modifying library code (unless cffi allows adding to an enum after it is defined, not sure about that) *Easier to add offsets to them, for example a loop to disable all lights could use (+ index gl:+light0+) instead of having to convert from enum and back, or store a list of the light enums or whatever. *being able to add offsets also solves the problem of some values (light in particular) potentially having more valid values than are enums. (The .spec files name 8 lights, but leaves room for 4096, I'm pretty sure there has been hardware supporting at least 32.) *compatibility with other bindings (glx and cl-sdl both use +foo+ style for enums if I remember correctly) *possibly speed. If cffi can remap values at compile time it probably isn't too bad, but it probably wouldn't be too hard to find code with a lot of enums specified at runtime. (Alternately, is it possible to tell cffi to allow using either the constants or the keywords?) Also, a small patch: someone in #lisp was having problems with OpenMCL objecting to compute-applicable-methods being called with extra arguments in glut/interface.lisp, which was fixed by the following patch to define-glut-event: diff -rN old-pct/glut/interface.lisp new-pct/glut/interface.lisp 130c130 < :func ',event-func :arg-count ,(length args)) --- > :func ',event-func :arg-count ,(length arg-names))

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[cl-opengl-devel] lispbuilder-sdl
by Luke Crook 30 Jan '07

30 Jan '07

FYI group. Here is CL-OPENGL running from lispbuilder-sdl http://article.gmane.org/gmane.lisp.cl-lispbuilder.general/648 - Luke

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