GLU3 FTW!

Scott Tsai: git URL

Fri, 22 Jan 2010 08:55:31 -0800

You probably want to advertise the "anongit" URL instead: git://anongit.freedesktop.org/~idr/glu3

Greg: Yay

Fri, 22 Jan 2010 09:57:48 -0800

Congrats!

Sean: SIMD support

Fri, 22 Jan 2010 15:23:22 -0800

I'm not sure if it's a target goal of yours at all, but in the interest of possibly (finally!) including a decently high-performance math library with OpenGL, perhaps you should take a look at the API changes necessary to ensure that GLU3 can be used with common compilers' SIMD support.

In particular, check out this article on some of the limitations and changes you have to make to a math library's API to work around many common compiler limitations: http://www.gamasutra.com/view/feature/4248/designing_fast_crossplatform_simd_.php

IanRomanick: RE: SIMD support

Mon, 25 Jan 2010 14:42:28 -0800

I read that article when it was printed in Game Developer. Yeah, that is part of the plan. That is one of the main motivations behind putting the inlined functions in a separate header file. My expectation is that most of the GLUvec4 operations will end up just being wrappers around the compiler SIMD intrinsics.

Some of the inspiration for GLU3 came from the vectormath library in Bullet. I had been using that for a long time, but quite a few aspects of its design (effectively no C interfaces, the Vector3 vs. Vector4 vs. Point3 bonghits, etc.) and massive amounts of bugs in the SSE implementations (Matrix4::lookAt is completely borked) caused me to abandon it. I do not intend to replicate the SOA vs. AOS organizations from vectormath. I think that was a design mistake. My preference is to provide some fundamental tools and instruct people how to use those tools to implement SOA or AOS.

I haven't implemented any of the SIMD versions because I haven't needed them. There's a lot of basic functionality that I want to implement first.

IanRomanick: RE: git URL

Mon, 25 Jan 2010 14:46:08 -0800

Fixed. Thanks.