Vibrant 1.5

[Don]

bearophile wrote:
> ponce:
> 
>> Vibrant has been open source'd (again):
>> http://bitbucket.org/ponce/vibrant
> 
> Very good. I have seen 2D vectors implemented something like ten times in D code, so I think it's time to stop this. They need to go in the standard library:
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/math/vec2.d
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/math/vec3.d
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/math/vec4.d
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/math/vectorop.d

Definitely we need vectors in Phobos.

> 
> Useful math, fast too:
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/math/common.d
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/math/rounding.d

Actually, I don't see any functions which are faster than std.math. 
std.math.exp2() is *much* faster than common.pow2() (one slow 
instruction, vs five!!!) And exp2 sets the flags correctly.
expi() is faster than sincos().

> Half floats, I don't know if they are better than user defined floats of Phobos2:
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/math/half.d
> 
> Quaternions:
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/math/quat.d
> 
> A color module is useful:
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/misc/colors.d
> Python std lib has colorsys:
> http://docs.python.org/library/colorsys.html
> 
> More useful general matrix code:
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/math/mat4.d
> 
> Some very basic geometry code fit for a std.geometry module:
> http://bitbucket.org/ponce/vibrant/src/tip/trunk/common2/math/math2d.d
> 
> I think all those things (maybe with a little more docs, improvements, unittests, contracts) are fit to be added to Phobos, because:
> - they are basic things that are commonly useful;
> - they aren't a lot of code;
> - they will be useful ten years from now too, they will not become obsolete;
> - I have seen them implemented in user D code several times;
> - Some of them are present in my dlibs1 and I have used them several times.

I agree. There's some useful stuff here.