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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* Unpublished-- rights reserved under the copyright laws of the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
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