Add ColorMapFilter

[finscn]

More details at : #61

inspired by :
https://www.youtube.com/watch?v=rfQ8rKGTVlg#t=25m03s
https://github.com/hughsk/webgl-texture3d
https://www.defold.com/tutorials/grading/

[finscn]

online demo :　http://fatidol.com/pixi-filters/

[bigtimebuddy]

Can we rename this to ColorMapFilter?

[finscn]

or ColorMappingFilter ? How do you think about it , @ivanpopelyshev ?

[bigtimebuddy]

Many of the other filters names are nouns, "color mapping" feels inconsistent.

[finscn]

mapping is also a noun.

mapping [ 'mæpiŋ ]
n.
a function such that for every element of one set there is a unique element of another set

example: ORM , Object Relational Mapping ( in ORM , mapping is a noun)

[bigtimebuddy]

I stand corrected! I read it more as an action.

I'm fine with either, but not ColorAdjustFilter.

[bigtimebuddy]

@finscn could you rename? Then I will merge.

[finscn]

ColorMapFilter or ColorMappingFilter ?

And if call this filter ColorMapFilter/ColorMappingFilter , shall we change the AdjustmentFilter to ColorAdjustFilter/ColorAdjustmentFilter ?

[bigtimebuddy]

I like ColorMapFilter because it's shorter, but whichever you prefer. Also, no need to change AdjustmentFilter, that's fine for now.

[finscn]

OK. I'll use ColorMapFilter , because there is a filter named SimpleLightMapFilter.
both map is better than one map & one mapping.

[bigtimebuddy]

Thanks @finscn, good work.