[gameprogrammer] Re: glut problems

A couple issues:

Call glutInitDisplayMode() before glutCreateWindow(). Also add
GLUT_DEPTH since you have enabled depth testing.

The triangle is being clipped. Change glTranslatef(0.0f,0.0f,-6.5f) to
glTranslatef(0.0f,0.0f,-0.5f);

Then you should see your triangle - it worked for me.

Bob


On 4/20/07, Yasser Gonzalez <yassergs@xxxxxxxxxxxxxxx> wrote:


Some body colud tell me what happends with this code. I don't see the
triangle on the screen:


#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <gl/glut.h>

void init(GLvoid)
{
  glClearColor(1.0f,0.0f,1.0f,0.0f);
  glEnable(GL_CULL_FACE);
  glCullFace(GL_BACK);
  glEnable(GL_DEPTH_TEST);
  glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
}

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

        gluPerspective(80.0f,(float)w/(float)h,1.0f,5000.0f);

        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();

}


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

        glTranslatef(0.0f,0.0f,-6.5f);

        glBegin(GL_TRIANGLES);
          glColor3f(0.0f,1.0f,0.0f);
          glVertex3f(0.0f,1.0f,0.0f);
          glVertex3f(-1.0f,-1.0f,0.0f);
          glVertex3f(1.0f,-1.0f,0.0f);
     glEnd();
        glutSwapBuffers();
}

void idle(void)
{
        display();
}


void keyPressed(unsigned char k, int x,int y)
{
        switch(k)
        {
        case 27:
                 exit(0);
                 break;

        }
}



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

        glutInit(&argc, argv);
        glutInitWindowPosition(5,5);
        glutInitWindowSize(400,400);
        glutCreateWindow("Ejemplo 2 de GLUT");
        glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE);
        init();

        glutDisplayFunc(display);
        glutIdleFunc(idle);
        glutKeyboardFunc(keyPressed);
        glutMainLoop();

        return 1;
}


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