- glLoadIdentity();
- glOrtho((GLdouble)0, (GLdouble)kContextWidth, (GLdouble)kContextHeight, 0, -1, 1);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-
- for(int y=0;y<kContextHeight;y+=2) {
-
- for(int x=0;x<kContextWidth;x++) {
- glRasterPos2i(x, y);
- glDrawPixels(1, 1, GL_RGB, GL_UNSIGNED_BYTE, &stencil);
- }
- }
+ glPushMatrix();
+ glLoadIdentity();
+ glOrtho((GLdouble)0, (GLdouble)kContextWidth, (GLdouble)kContextHeight, 0, -1, 1);
+ glMatrixMode(GL_MODELVIEW);
+ glPushMatrix();
+ glLoadIdentity();
+ glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );
+ glDisable(GL_LINE_SMOOTH);
+
+ // Add 0.5 to the coordinates, because OpenGL considers a pixel should be
+ // turned on when a line passes through the center of it.
+ if ( mode == stereoHorizontalInterlaced ) {
+ for(int y=0;y<kContextHeight;y+=2) {
+ glBegin(GL_LINES);
+ glVertex3f(0.5, y+0.5, 0);
+ glVertex3f(kContextWidth+0.5, y+0.5, 0);
+ glEnd();
+ }
+ } else {
+ for(int x=0;x<kContextWidth;x+=2) {
+ glBegin(GL_LINES);
+ glVertex3f(x+0.5, 0.5, 0);
+ glVertex3f(x+0.5, kContextHeight+0.5, 0);
+ glEnd();
+ }
+ }
+
+ glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
+
+ glPopMatrix();
+ glMatrixMode(GL_PROJECTION);
+ glPopMatrix();