implemented box filter
altered 'filterWidth' to a uniform variable
added seperated filter to glowing teapot
- GlowingTeapot.cpp: made refactoring; added ability to toggle filter type (press 's' for compact or seperated filter), drawing of original scene (press 'd')
- blur_hori.frag: for horizontal seperated filtering
- blur_vert.frag: for vertical seperated filtering
- CMakeLists.txt: now copies new shader files to build directory, too
Merge branch 'GlowingTeapot_TH'