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Thread: disappearing window

  1. #1
    Junior Member Newbie
    Join Date
    Apr 2003
    Location
    Fayetteville, Ar , 72702
    Posts
    24

    disappearing window

    AS soon as I run the program my window come and disappear right away. here is the code.
    #include <glu.h>
    #include <stdlib.h>
    #include "glut.h"


    GLfloat ctlpts[4][4][3];
    GLUnurbsObj *theNurb;

    void display(void) { GLfloat knots[8] = {0.0,0.0,0.0,0.0,1.0,1.0,1.0,1.0};
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
    glRotatef(330.0,1.,0.,0.);
    glScalef(0.5,0.5,0.5);
    gluBeginSurface(theNurb);
    gluNurbsSurface(theNurb,8,knots,8,knots,4*3,3,&ctl pts[0][0][0],4,4,GL_MAP2_VERTEX_3);
    gluEndSurface(theNurb);
    glPopMatrix();
    glFlush();
    }

    void init_surface(void) {
    int u,v;
    for( u = 0 ; u < 4 ; u++ ) {
    for( v = 0 ; v < 4 ; v++ ) {
    ctlpts[u][v][0] = 2.*(u-1.5);
    ctlpts[u][v][1] = 2.*(v-1.5);
    if ((u==1 &#0124; &#0124; u==2)&&(v==1 &#0124; &#0124; v==2))
    ctlpts[u][v][2] = 3.0;
    else
    ctlpts[u][v][2] = -3.0; } }
    }

    void myinit(void) {
    GLfloat dif[] = {0.7,0.7,0.7,1.0};
    GLfloat spe[] = {1.0,1.0,1.0,1.0};
    GLfloat shininess[] = {100.0};
    glClearColor(0.0,0.0,0.0,1.0);
    glMaterialfv(GL_FRONT,GL_DIFFUSE,dif);
    glMaterialfv(GL_FRONT,GL_SPECULAR, spe);
    glMaterialfv(GL_FRONT,GL_SHININESS,shininess);
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);
    glDepthFunc(GL_LESS);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_AUTO_NORMAL);
    glEnable(GL_NORMALIZE);
    init_surface();
    theNurb = gluNewNurbsRenderer();
    gluNurbsProperty(theNurb,GLU_SAMPLING_TOLERANCE,25 .0);
    gluNurbsProperty(theNurb,GLU_DISPLAY_MODE,GLU_FILL );
    }

    void myReshape(int w,int h) {
    glViewport(0,0,w,h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(45.0,(float)w/(float)h,3.0,8.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0.0,0.0,-5.0);
    }

    int main(int argc,char** argv) {
    glutInit(&argc, argv);

    glutCreateWindow("molehill");
    glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
    myinit();
    glutInitWindowPosition(0,0);



    glutReshapeFunc(myReshape);
    glutDisplayFunc(display);
    glutMainLoop();

    }
    Thank you

  2. #2
    Member Contributor
    Join Date
    Jul 2003
    Location
    va beach
    Posts
    63

    Re: disappearing window

    Code snippet from http://nehe.gamedev.net

    Give this a shot :

    if (PeekMessage(&msg,NULL,0,0,PM_REMOVE)) // Is There A Message Waiting?
    {
    if (msg.message==WM_QUIT) // Have We Received A Quit Message?
    {
    done=TRUE; // If So done=TRUE
    }
    else // If Not, Deal With Window Messages
    {
    TranslateMessage(&msg); // Translate The Message
    DispatchMessage(&msg); // Dispatch The Message
    }
    }
    else // If There Are No Messages
    {
    // Draw The Scene. Watch For ESC Key And Quit Messages From DrawGLScene()
    if (active) // Program Active?
    {
    if (keys[VK_ESCAPE]) // Was ESC Pressed?
    {
    done=TRUE; // ESC Signalled A Quit
    }
    else // Not Time To Quit, Update Screen
    {
    DrawGLScene(); // Draw The Scene
    SwapBuffers(hDC); // Swap Buffers (Double Buffering)
    }
    }


    if (keys[VK_F1]) // Is F1 Being Pressed?
    {
    keys[VK_F1]=FALSE; // If So Make Key FALSE
    KillGLWindow(); // Kill Our Current Window
    fullscreen=!fullscreen; // Toggle Fullscreen / Windowed Mode
    // Recreate Our OpenGL Window
    if (!CreateGLWindow("NeHe's OpenGL Framework",640,480,16,fullscreen))
    {
    return 0; // Quit If Window Was Not Created
    }
    }
    }
    }

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