+ /*************************************************************************
+ * 6th square
+ */
+ if (glutExtensionSupported("GL_EXT_stencil_wrap")) {
+ if (use20syntax) {
+ stencil_func_separate(GL_FRONT, GL_ALWAYS, 0, ~0);
+ stencil_func_separate(GL_BACK, GL_ALWAYS, 0, ~0);
+ }
+ else {
+ stencil_func_separate_ati(GL_ALWAYS, GL_ALWAYS, 0, ~0);
+ }
+ stencil_op_separate(GL_FRONT, GL_KEEP, GL_KEEP, GL_KEEP);
+ stencil_op_separate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
+
+ glTranslatef(3.0, 0, 0);
+ glBegin(GL_QUADS);
+ glColor3f( 0.9, 0.9, 0.9 );
+ for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
+ /* this should be back facing */
+ glVertex2f(-1, -1);
+ glVertex2f(-1, 1);
+ glVertex2f( 1, 1);
+ glVertex2f( 1, -1);
+ /* this should be front facing */
+ glVertex2f(-1, -1);
+ glVertex2f( 1, -1);
+ glVertex2f( 1, 1);
+ glVertex2f(-1, 1);
+ }
+ glEnd();
+
+ glStencilFunc(GL_EQUAL, 260 - 255, ~0);
+ glBegin(GL_QUADS);
+ glColor3f( 0.5, 0.5, 0.5 );
+ glVertex2f(-1, -1);
+ glVertex2f( 1, -1);
+ glVertex2f( 1, 1);
+ glVertex2f(-1, 1);
+ glEnd();
+ }
+