Elysian Shadows

Code: Select all

void initialize_it(void)   //sets up graphic stuff.
{
   glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
   glutInitWindowSize(400,200);
   glutInitWindowPosition(100,50);
   glutCreateWindow("Moving Square");
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   gluPerspective(45.0f, ScreenWidthInPixels / ScreenHeightInPixels, 0.1f, 100.0f);
//   glEnable(GL_DEPTH_TEST);        // Don't need depth testing 
//   glDepthFunc(GL_LEQUAL);

    // Perspective is a "camera" idea, since you have a global camera in this demo we can just set the perspective once //
    // There is no "view" transform in your case. However, you have a model transform. It does not make sense to  //
    // apply model transforms in initialization routines, these are applied per frame //
//   glMatrixMode(GL_MODELVIEW);
//   glLoadIdentity();
}

Code: Select all

void rect_display(void)   
{
   glClearColor(0, 0, 0, 0);   
   glClear(GL_COLOR_BUFFER_BIT); 

    // Make the model/view matrix the current one. All matrix ops happen to the top matrix on the model/view matrix stack //
    // Load an identity matrix into the top matrix of this stack //
    // glTranslatef multiplies the current matrix (identity) with a translation matrix //
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0, 0,translationAmount);
   translationAmount-=0.0001;
   glBegin(GL_TRIANGLES);
        
        glColor3f(0.0, 0.0, 1.0);  //front.
        
        glVertex3f(0.3, 0.8, 0.2);
        glVertex3f(0.3, 0.2, 0.2);
        glVertex3f(0.8, 0.8, 0.2);
   
   glEnd();
   
//   glPopMatrix();
   
   glFlush();
   glutSwapBuffers();
   glutPostRedisplay();  
}