OpenGL and Mesa

OpenGL Example

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>

void display(void)
{
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();

  glTranslatef(0.0f,0.0f,-5.0f);

  glBegin(GL_TRIANGLES);                                                  
  glVertex3f(-1.0f, 0.0f, 0.0f);
  glVertex3f(0.0f, 1.0f, 0.0f);
  glVertex3f(1.0f, 0.0f, 0.0f);
  glEnd();

  glFlush();
}

void reshape (int w, int h)
{
  glViewport (0, 0, (GLsizei) w, (GLsizei) h);

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(45.0f, (GLfloat) w / (GLfloat) h, 0.1f, 10.0f);
}

int main(int argc, char** argv)
{
  glutInit(&argc, argv);
  glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
  glutInitWindowSize (500, 500); 
  glutInitWindowPosition (100, 100);
  glutCreateWindow (argv[0]);
  glutDisplayFunc(display); 
  glutReshapeFunc(reshape);
  glutMainLoop();
  return 0;
}