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+
+/* 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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+/* bezsurf.c
+ * This program renders a lighted, filled Bezier surface,
+ * using two-dimensional evaluators.
+ */
+#include <stdlib.h>
+#include <GL/glut.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();
+}
+
+int
+main(int argc, char **argv)
+{
+ glutInit(&argc, argv);
+ glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
+ glutCreateWindow(argv[0]);
+ myinit();
+ glutReshapeFunc(myReshape);
+ glutDisplayFunc(display);
+ glutMainLoop();
+ return 0; /* ANSI C requires main to return int. */
+}