Disabled warning messages if the automatically created disabled
textures are not in the texture cache.
Merge branch 'master' of github.com:supertuxkart/stk-code
Merge branch 'master' of https://github.com/supertuxkart/stk-code
Use variable sigma for blur filter
Change fog equation
Added more asserts.
Fixed compiler warnings.
Use fog start value to determine density
tweak value
Implement scattering for point light
Try fullscreen fog