如何修复 Mac OS X OpenGL/glut 上的 window 大小问题？

Question

I printed 4 dots using following code on renderScene:

glColor3f(0, 0, 0);
glPointSize(4.0f);
glBegin(GL_POINTS);
glVertex2f(0.9, 0.9);
glVertex2f(0.9, -0.9);
glVertex2f(-0.9, 0.9);
glVertex2f(-0.9, -0.9);
glEnd();

and this shows up:

four dots show up at corner

and if I try to draw triangles, 3/4 of it does not show on screen

like this:

3/4 of screen not shown

how can I fix this problem? thanks.

Answer 1

You have to adjust the viewport to the size of the default framebuffer (window). See glViewport :

glViewport(0, 0, width, height);

Answer 2

try downloading this fix. http://iihm.imag.fr/blanch/software/glut-macosx/ . Finally add this line to your code:

#ifdef __APPLE__
    glutInitDisplayString("rgba double depth hidpi");
#endif

This should fix your problem, it worked for me.

Answer 3

I had to do glViewport(0, 0, width*2, height*2) .