glBlendFunc( GL_ONE, GL_ZERO )
glBlendFunc( GL_DST_COLOR, GL_ZERO )
[
glEnable( GL_LINE_SMOOTH) ]
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA )
glBlendFunc( GL_CONSTANT_ALPHA, GL_ONE_MINUS_CONSTANT_ALPHA )
[
glEnable( GL_POLYGON_SMOOTH ) ]
glBlendFunc( GL_SRC_ALPHA_SATURATE, GL_ONE )
glBlendEquationEXT( GL_LOGIC_OP )
glLogicOp( GL_XOR )
glBlendFunc( GL_ONE, GL_ONE )