OpenGL graphical glitches

Question

Whenever build and run this piece of code in Xcode 5, with of the respective library computer display bugs out. It is hard to se but you can see that the window is appearing with the triangle.

Not sure if this makes a difference but I am running on OSX 1.9.2

#include <iostream>

#include <OpenGL/gl.h>
#include <OpenAL/al.h>
#include <OpenAL/alc.h>
#include <GLUT/glut.h>

int windowwitch= 1280;
int wndowhight=800;


using namespace std;
void display();

int main(int argc, char ** argv){

    glutInit(&argc, argv);
    glutInitWindowPosition(0, 0);

    glutInitWindowSize(windowwitch, wndowhight);
    glutInitDisplayMode(GL_RGBA12 | GLUT_DOUBLE |GLUT_DEPTH);

    glutCreateWindow("Alex's Game!!");

    glutDisplayFunc(display);



    //Main loop
    glutMainLoop();

    return 0;
}



void display(){
    glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BITS);
    glLoadIdentity();
    glBegin(GL_TRIANGLES);

    glVertex2f(-2, -2);
    glVertex2f(0, 1);
    glVertex2f(1,-1);

    glEnd();



    glutSwapBuffers();
}

Answer 1

glutInitDisplayMode(GL_RGBA12 | GLUT_DOUBLE |GLUT_DEPTH);
                    ^^^^^^^^^

GL_RGBA12 is not a valid argument for glutInitDisplayMode().

Use GLUT_RGBA or GLUT_RGB instead.

---

glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BITS);
                             ^^^^^^^^^^^^^

GL_DEPTH_BITS is not a valid argument for glClear().

Use GL_DEPTH_BUFFER_BIT instead.