Initial revision

1 files changed, 217 insertions, 0 deletions

diff --git a/progs/redbook/surface.c b/progs/redbook/surface.c
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+/* aux2glut conversion Copyright (c) Mark J. Kilgard, 1994, 1995 */
+
+/**
+ * (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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+/**
+ *  surface.c
+ *  This program draws a NURBS surface in the shape of a 
+ *  symmetrical hill.
+ */
+#include <GL/glut.h>
+
+GLfloat ctlpoints[4][4][3];
+int showPoints = 0;
+
+GLUnurbsObj *theNurb;
+
+/*
+ *  Initializes the control points of the surface to a small hill.
+ *  The control points range from -3 to +3 in x, y, and z
+ */
+void init_surface(void)
+{
+    int u, v;
+    for (u = 0; u < 4; u++) {
+	for (v = 0; v < 4; v++) {
+	    ctlpoints[u][v][0] = 2.0*((GLfloat)u - 1.5);
+	    ctlpoints[u][v][1] = 2.0*((GLfloat)v - 1.5);
+
+	    if ( (u == 1 || u == 2) && (v == 1 || v == 2))
+		ctlpoints[u][v][2] = 7.0;
+	    else
+		ctlpoints[u][v][2] = -3.0;
+	}
+    }				
+}				
+			
+/*  Initialize material property and depth buffer.
+ */
+void myinit(void)
+{
+    GLfloat mat_diffuse[] = { 0.7, 0.7, 0.7, 1.0 };
+    GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
+    GLfloat mat_shininess[] = { 100.0 };
+
+    glClearColor (0.0, 0.0, 0.0, 1.0);
+    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
+    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
+    glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
+
+    glEnable(GL_LIGHTING);
+    glEnable(GL_LIGHT0);
+    glDepthFunc(GL_LESS);
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_AUTO_NORMAL);
+    glEnable(GL_NORMALIZE);
+
+    init_surface();
+
+    theNurb = gluNewNurbsRenderer();
+    gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0);
+    gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslatef (0.0, 0.0, -5.0);
+}
+
+void display(void)
+{
+    GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
+    int i, j;
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glPushMatrix();
+    glRotatef(330.0, 1.,0.,0.);
+    glScalef (0.25, 0.25, 0.25);
+
+    gluBeginSurface(theNurb);
+    gluNurbsSurface(theNurb, 
+	    8, knots,
+	    8, knots,
+	    4 * 3,
+	    3,
+	    &ctlpoints[0][0][0], 
+	    4, 4,
+	    GL_MAP2_VERTEX_3);
+    gluEndSurface(theNurb);
+
+    if(showPoints) {
+    glPointSize(5.0);
+    glDisable(GL_LIGHTING);
+    glColor3f(1.0, 1.0, 0.0);
+    glBegin(GL_POINTS);
+    for(i=0;i<4;i++) {
+      for(j=0;j<4;j++) {
+	glVertex3f(ctlpoints[i][j][0], ctlpoints[i][j][1], ctlpoints[i][j][2]);
+      }
+    }
+    glEnd();
+    glEnable(GL_LIGHTING);
+    }
+        
+    glPopMatrix();
+    glutSwapBuffers();
+}
+
+void reshape(int w, int h)
+{
+    glViewport(0, 0, w, h);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective (45.0, (GLdouble)w/(GLdouble)h, 3.0, 8.0);
+
+    glMatrixMode(GL_MODELVIEW);
+}
+
+void
+menu(int value)
+{
+    switch (value) {
+    case 0:
+    case 1:
+        showPoints = value;
+	break;
+    case 2:
+        gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
+	break;
+    case 3:
+        gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_OUTLINE_POLYGON);
+	break;
+    }
+    glutPostRedisplay();
+}
+
+int down = 0, lastx;
+
+/* ARGSUSED1 */
+void
+motion(int x, int y)
+{
+    if (down) {
+        glRotatef(lastx - x, 0, 1, 0);
+        lastx = x;
+        glutPostRedisplay();
+    }
+}
+
+/* ARGSUSED3 */
+void
+mouse(int button, int state, int x, int y)
+{
+    if (button == GLUT_LEFT_BUTTON) {
+        if (state == GLUT_DOWN) {
+            lastx = x;
+            down = 1;
+        } else {
+            down = 0;
+        }
+    }
+}
+
+/* Main Loop */
+int
+main(int argc, char** argv)
+{
+    glutInit(&argc, argv);
+    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGB);
+    glutCreateWindow(argv[0]);
+    myinit();
+    glutReshapeFunc(reshape);
+    glutDisplayFunc(display);
+    glutCreateMenu(menu);
+    glutAddMenuEntry("Show control points", 1);
+    glutAddMenuEntry("Hide control points", 0);
+    glutAddMenuEntry("Solid", 2);
+    glutAddMenuEntry("Wireframe", 3);
+    glutAttachMenu(GLUT_RIGHT_BUTTON);
+    glutMouseFunc(mouse);
+    glutMotionFunc(motion);
+    glutMainLoop();
+    return 0;             /* ANSI C requires main to return int. */
+}