using the QT seems to achieve a great effect of the fog, in linux below image with OpenGL programming of great reference value.

fog
...\AUTHORS
...\AUTHORS.zh_CN
...\COPYING
...\COPYING.zh_CN
...\data

...\INSTALL
...\INSTALL.zh_CN
...\lesson16
...\lesson16.pro
...\main.cpp
...\main.o
...\Makefile
...\moc_nehewidget.cpp
...\moc_nehewidget.o
...\nehewidget.cpp
...\nehewidget.h
...\nehewidget.o
...\README
...\README.zh_CN

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