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

## Detailed Description

This program demonstrates vertex arrays.

    /*
     * Copyright (c) 1993-1997, 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     * Unpublished-- rights reserved under the copyright laws of the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(R) is a registered trademark of Silicon Graphics, Inc.
     */

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

    #ifdef GL_VERSION_1_1
    #define POINTER 1
    #define INTERLEAVED 2

    #define DRAWARRAY 1
    #define ARRAYELEMENT  2
    #define DRAWELEMENTS 3

    int setupMethod = POINTER;
    int derefMethod = DRAWARRAY;

    void setupPointers(void)
    {
       static GLint vertices[] = {25, 25,
                           100, 325,
                           175, 25,
                           175, 325,
                           250, 25,
                           325, 325};
       static GLfloat colors[] = {1.0, 0.2, 0.2,
                           0.2, 0.2, 1.0,
                           0.8, 1.0, 0.2,
                           0.75, 0.75, 0.75,
                           0.35, 0.35, 0.35,
                           0.5, 0.5, 0.5};

       glEnableClientState (GL_VERTEX_ARRAY);
       glEnableClientState (GL_COLOR_ARRAY);

       glVertexPointer (2, GL_INT, 0, vertices);
       glColorPointer (3, GL_FLOAT, 0, colors);
    }

    void setupInterleave(void)
    {
       static GLfloat intertwined[] =
          {1.0, 0.2, 1.0, 100.0, 100.0, 0.0,
           1.0, 0.2, 0.2, 0.0, 200.0, 0.0,
           1.0, 1.0, 0.2, 100.0, 300.0, 0.0,
           0.2, 1.0, 0.2, 200.0, 300.0, 0.0,
           0.2, 1.0, 1.0, 300.0, 200.0, 0.0,
           0.2, 0.2, 1.0, 200.0, 100.0, 0.0};

       glInterleavedArrays (GL_C3F_V3F, 0, intertwined);
    }

    void init(void)
    {
       glClearColor (0.0, 0.0, 0.0, 0.0);
       glShadeModel (GL_SMOOTH);
       setupPointers ();
    }

    void display(void)
    {
       glClear (GL_COLOR_BUFFER_BIT);

       if (derefMethod == DRAWARRAY)
          glDrawArrays (GL_TRIANGLES, 0, 6);
       else if (derefMethod == ARRAYELEMENT) {
          glBegin (GL_TRIANGLES);
          glArrayElement (2);
          glArrayElement (3);
          glArrayElement (5);
          glEnd ();
       }
       else if (derefMethod == DRAWELEMENTS) {
          GLuint indices[4] = {0, 1, 3, 4};

          glDrawElements (GL_POLYGON, 4, GL_UNSIGNED_INT, indices);
       }
       glFlush ();
    }

    void reshape (int w, int h)
    {
       glViewport (0, 0, (GLsizei) w, (GLsizei) h);
       glMatrixMode (GL_PROJECTION);
       glLoadIdentity ();
       gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h);
    }

    /* ARGSUSED2 */
    void mouse (int button, int state, int x, int y)
    {
       switch (button) {
          case GLUT_LEFT_BUTTON:
             if (state == GLUT_DOWN) {
                if (setupMethod == POINTER) {
                   setupMethod = INTERLEAVED;
                   setupInterleave();
                }
                else if (setupMethod == INTERLEAVED) {
                   setupMethod = POINTER;
                   setupPointers();
                }
                glutPostRedisplay();
             }
             break;
          case GLUT_MIDDLE_BUTTON:
          case GLUT_RIGHT_BUTTON:
             if (state == GLUT_DOWN) {
                if (derefMethod == DRAWARRAY)
                   derefMethod = ARRAYELEMENT;
                else if (derefMethod == ARRAYELEMENT)
                   derefMethod = DRAWELEMENTS;
                else if (derefMethod == DRAWELEMENTS)
                   derefMethod = DRAWARRAY;
                glutPostRedisplay();
             }
             break;
          default:
             break;
       }
    }

    /* ARGSUSED1 */
    void keyboard(unsigned char key, int x, int y)
    {
       switch (key) {
          case 27:
             exit(0);
             break;
       }
    }

    int main(int argc, char** argv)
    {
       glutInit(&argc, argv);
       glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
       glutInitWindowSize (350, 350);
       glutInitWindowPosition (100, 100);
       glutCreateWindow (argv[0]);
       init ();
       glutDisplayFunc(display);
       glutReshapeFunc(reshape);
       glutMouseFunc(mouse);
       glutKeyboardFunc (keyboard);
       glutMainLoop();
       return 0;
    }
    #else
    int main(int argc, char** argv)
    {
        fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n");
        fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n");
        fprintf (stderr, "you may be able to modify this program to make it run.\n");
        return 0;
    }
    #endif

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