Okay, when I execute this code, it draws a rectangle XORed with the clear color (the screen is otherwise blank…) The problem is that it doesn’t XOR with itself (which kind of defeats the purpose). I just end up with a big blob of XOR smeared across the screen…
//Draw the rectangle…
glColor3f(1,1,1);
glDrawBuffer(GL_FRONT);
glEnable(GL_COLOR_LOGIC_OP);
glLogicOp(GL_XOR);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glOrtho(0, width(), 0, height(), -1, 1);glRecti(x1, height() - y1, x2, height() - y2);glDrawBuffer(GL_BACK);
glDisable(GL_COLOR_LOGIC_OP);
glPopMatrix();
Any help would be appreciated,
Chris
[EDIT - bloody code tags… I never get them right the first time 
]
[This message has been edited by chennes (edited 07-06-2001).]