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+/*
+ * 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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+
+/*
+ * varray.c
+ * This program demonstrates vertex arrays.
+ */
+#include <GL/glut.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