OpenGLUT 0.6.3 development - OpenGLUT: bezmesh.c File Reference
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# bezmesh.c File Reference

## Detailed Description

This program renders a lighted, filled Bezier surface, using two-dimensional evaluators.

    /* Copyright (c) Mark J. Kilgard, 1994. */

    /*
     * (c) Copyright 1993, Silicon Graphics, Inc.
     * ALL RIGHTS RESERVED
     * Permission to use, copy, modify, and distribute this software for
     * any purpose and without fee is hereby granted, provided that the above
     * copyright notice appear in all copies and that both the copyright notice
     * and this permission notice appear in supporting documentation, and that
     * the name of Silicon Graphics, Inc. not be used in advertising
     * or publicity pertaining to distribution of the software without specific,
     * written prior permission.
     *
     * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
     * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
     * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
     * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
     * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
     * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
     * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
     * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
     * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
     * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
     * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
     *
     * US Government Users Restricted Rights
     * Use, duplication, or disclosure by the Government is subject to
     * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
     * (c)(1)(ii) of the Rights in Technical Data and Computer Software
     * clause at DFARS 252.227-7013 and/or in similar or successor
     * clauses in the FAR or the DOD or NASA FAR Supplement.
     * Unpublished-- rights reserved under the copyright laws of the
     * United States.  Contractor/manufacturer is Silicon Graphics,
     * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
     *
     * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
     */

    #include <GL/openglut.h>
    #include <stdlib.h>

    GLfloat ctrlpoints[4][4][3] =
    {
        {
            {-1.5, -1.5, 4.0},
            {-0.5, -1.5, 2.0},
            {0.5, -1.5, -1.0},
            {1.5, -1.5, 2.0}},
        {
            {-1.5, -0.5, 1.0},
            {-0.5, -0.5, 3.0},
            {0.5, -0.5, 0.0},
            {1.5, -0.5, -1.0}},
        {
            {-1.5, 0.5, 4.0},
            {-0.5, 0.5, 0.0},
            {0.5, 0.5, 3.0},
            {1.5, 0.5, 4.0}},
        {
            {-1.5, 1.5, -2.0},
            {-0.5, 1.5, -2.0},
            {0.5, 1.5, 0.0},
            {1.5, 1.5, -1.0}}
    };

    void
    initlights(void)
    {
        GLfloat ambient[] =
        {0.2, 0.2, 0.2, 1.0};
        GLfloat position[] =
        {0.0, 0.0, 2.0, 1.0};
        GLfloat mat_diffuse[] =
        {0.6, 0.6, 0.6, 1.0};
        GLfloat mat_specular[] =
        {1.0, 1.0, 1.0, 1.0};
        GLfloat mat_shininess[] =
        {50.0};

        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);

        glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
        glLightfv(GL_LIGHT0, GL_POSITION, position);

        glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
        glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
        glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
    }

    void
    display(void)
    {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glPushMatrix();
        glRotatef(85.0, 1.0, 1.0, 1.0);
        glEvalMesh2(GL_FILL, 0, 20, 0, 20);
        glPopMatrix();
        glFlush();
    }

    void
    myinit(void)
    {
        glClearColor(0.0, 0.0, 0.0, 1.0);
        glEnable(GL_DEPTH_TEST);
        glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4,
            0, 1, 12, 4, &ctrlpoints[0][0][0]);
        glEnable(GL_MAP2_VERTEX_3);
        glEnable(GL_AUTO_NORMAL);
        glEnable(GL_NORMALIZE);
        glMapGrid2f(20, 0.0, 1.0, 20, 0.0, 1.0);
        initlights();       /* for lighted version only */
    }

    void
    myReshape(int w, int h)
    {
        glViewport(0, 0, w, h);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        if (w <= h)
            glOrtho(-4.0, 4.0, -4.0 * (GLfloat) h / (GLfloat) w,
                4.0 * (GLfloat) h / (GLfloat) w, -4.0, 4.0);
        else
            glOrtho(-4.0 * (GLfloat) w / (GLfloat) h,
                4.0 * (GLfloat) w / (GLfloat) h, -4.0, 4.0, -4.0, 4.0);
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
    }

    static void
    key(unsigned char k, int x, int y)
    {
      switch (k) {
      case 27:  /* Escape */
        exit(0);
        break;
      default:
        return;
      }
      glutPostRedisplay();
    }

    int
    main(int argc, char **argv)
    {
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
        glutCreateWindow(argv[0]);
        myinit();
        glutReshapeFunc(myReshape);
        glutDisplayFunc(display);
        glutKeyboardFunc(key);
        glutMainLoop();
        return 0;             /* ANSI C requires main to return int. */
    }

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