Playing with fixed-function effects

OSG supports almost all kinds of OpenGL rendering attributes and modes by using the osg::StateAttribute derived classes. The following table is part of over 40 OSG components that encapsulate major OpenGL fixed-function states:

Type ID

Class name

Associated mode

Related OpenGL functions

ALPHAFUNC

osg::AlphaFunc

GL_ALPHA_TEST

glAlphaFunc()

BLENDFUNC

osg::BlendFunc

GL_BLEND

glBlendFunc() and glBlendFuncSeparate()

CLIPPLANE

osg::ClipPlane

GL_CLIP_PLANEi (i ranges from 0 to 5)

glClipPlane()

COLORMASK

osg::ColorMask

-

glColorMask()

CULLFACE

osg::CullFace

GL_CULLFACE

glCullFace()

DEPTH

osg::Depth

GL_DEPTH_TEST

glDepthFunc(), glDepthRange(), and glDepthMask()

FOG

osg::Fog

GL_FOG

glFog() ...

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