- Improved base material handling in OpenGL driver.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4979 dfc29bdd-3216-0410-991c-e03cc46cb475
- Added support for Color Mask in OpenGL call bridge.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4980 dfc29bdd-3216-0410-991c-e03cc46cb475
- Minor code improvements, replaced if-else block by switch.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4981 dfc29bdd-3216-0410-991c-e03cc46cb475