On 14 January 2016 at 14:56, Robert Milharcic <[email protected]> wrote: > If I'm not mistaken, the #pragma directive is used by the C/C++ preprocessor > for providing additional information, beyond what the language itself can > offer. I thought this was the main inspiration for #pragma(tic) shader > composition. Anyway, based on feedback I'm now convinced that my proposition > isn't that useful as I thought :) and on that note, I rest my case.
#pragma is indeed the C/C++ mechanism for providing extra hints to specific compilers. In terms of coming up with #pragma(tic) shader composition I started with the observation that C/C++ macro's and #define's that could do much of the job of shader composition, but then I needed a mechanism for the shader to specify which #define's it required as input to the shaders. After a bit of head scratching it occurred to me that #pragma was support by GLSL and since it's a language feature I could piggy back the extra information specification into the shaders. Once I spotted this missing bit of jigsaw it was just too elegant not to work, thankfully the implementation ended up being relatively tidy too. I'm still open to making the shader parsing extensible, it seems like an interesting experimental tool. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
