[OpenGL] hold the left mouse button drag out a rectangle

99-1GLHW11\99-1GLHW11\99-1GLHW11.cpp
..........\..........\99-1GLHW11.vcproj
..........\..........\99-1GLHW11.vcproj.8.00.old
..........\..........\99-1GLHW11.vcproj.kingpower-PC.kingpower.user
..........\..........\99-1GLHW11.vcproj.STUDENT4-4.user.user
..........\..........\Debug\99-1GLHW11.exe.embed.manifest
..........\..........\.....\99-1GLHW11.exe.embed.manifest.res
..........\..........\.....\99-1GLHW11.exe.intermediate.manifest
..........\..........\.....\99-1GLHW11.obj
..........\..........\.....\99-1GLHW11.pch
..........\..........\.....\BuildLog.htm
..........\..........\.....\mt.dep
..........\..........\.....\stdafx.obj
..........\..........\.....\vc80.idb
..........\..........\.....\vc80.pdb
..........\..........\.....\vc90.idb
..........\..........\.....\vc90.pdb
..........\..........\ReadMe.txt
..........\..........\stdafx.cpp
..........\..........\stdafx.h
..........\99-1GLHW11.exe
..........\99-1GLHW11.ncb
..........\99-1GLHW11.sln
..........\99-1GLHW11.sln.old
..........\99-1GLHW11.suo
..........\99-1GLHW11.suo.old
..........\debug\99-1GLHW11.exe
..........\.....\99-1GLHW11.ilk
..........\.....\99-1GLHW11.pdb
..........\UpgradeLog.XML
..........\_UpgradeReport_Files\UpgradeReport.css
..........\....................\UpgradeReport.xslt
..........\....................\UpgradeReport_Minus.gif
..........\....................\UpgradeReport_Plus.gif
..........\99-1GLHW11\Debug
..........\99-1GLHW11
..........\debug
..........\_UpgradeReport_Files
99-1GLHW11

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