1 files changed, 114 insertions, 0 deletions
diff --git a/progs/redbook/bezcurve.c b/progs/redbook/bezcurve.c
new file mode 100644
index 0000000000..5dee440396
--- /dev/null
+++ b/progs/redbook/bezcurve.c
@@ -0,0 +1,114 @@
+/*
+ * 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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+
+/*  bezcurve.c			
+ *  This program uses evaluators to draw a Bezier curve.
+ */
+#include <stdlib.h>
+#include <GL/glut.h>
+
+GLfloat ctrlpoints[4][3] = {
+	{ -4.0, -4.0, 0.0}, { -2.0, 4.0, 0.0}, 
+	{2.0, -4.0, 0.0}, {4.0, 4.0, 0.0}};
+
+void init(void)
+{
+   glClearColor(0.0, 0.0, 0.0, 0.0);
+   glShadeModel(GL_FLAT);
+   glMap1f(GL_MAP1_VERTEX_3, 0.0, 1.0, 3, 4, &ctrlpoints[0][0]);
+   glEnable(GL_MAP1_VERTEX_3);
+}
+
+void display(void)
+{
+   int i;
+
+   glClear(GL_COLOR_BUFFER_BIT);
+   glColor3f(1.0, 1.0, 1.0);
+   glBegin(GL_LINE_STRIP);
+      for (i = 0; i <= 30; i++) 
+         glEvalCoord1f((GLfloat) i/30.0);
+   glEnd();
+   /* The following code displays the control points as dots. */
+   glPointSize(5.0);
+   glColor3f(1.0, 1.0, 0.0);
+   glBegin(GL_POINTS);
+      for (i = 0; i < 4; i++) 
+         glVertex3fv(&ctrlpoints[i][0]);
+   glEnd();
+   glFlush();
+}
+
+void reshape(int w, int h)
+{
+   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   if (w <= h)
+      glOrtho(-5.0, 5.0, -5.0*(GLfloat)h/(GLfloat)w, 
+               5.0*(GLfloat)h/(GLfloat)w, -5.0, 5.0);
+   else
+      glOrtho(-5.0*(GLfloat)w/(GLfloat)h, 
+               5.0*(GLfloat)w/(GLfloat)h, -5.0, 5.0, -5.0, 5.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+}
+
+/* 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 (500, 500);
+   glutInitWindowPosition (100, 100);
+   glutCreateWindow (argv[0]);
+   init ();
+   glutDisplayFunc(display);
+   glutReshapeFunc(reshape);
+   glutKeyboardFunc (keyboard);
+   glutMainLoop();
+   return 0;
+}