Convert texture from srgb and use srgb fbo
Expand HDR use.
Fix negative value that introduces a bug on nvidia
Remove some unused code
Improve ao and bloom.
Factorize luminance computation.
Write a shader to convert CIE to RGB.
Add some code to average log luminance.
Plug in brightness adaptation
Improve bright attenuation although not perfect
Using formula from an article suggested by samuncle
Disable auto exposure for now.
Merge branch 'properlinearpipeline'

* properlinearpipeline:
  Disable auto exposure for now.
  Using formula from an article suggested by samuncle
  Improve bright attenuation although not perfect
  Plug in brightness adaptation
  Add some code to average log luminance.
  Write a shader to convert CIE to RGB.
  Factorize luminance computation.
  Improve ao and bloom.
  Remove some unused code
  Fix negative value that introduces a bug on nvidia
  Expand HDR use.
  Convert texture from srgb and use srgb fbo