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Diffstat (limited to 'progs/redbook/surfpoints.c')
| -rw-r--r-- | progs/redbook/surfpoints.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/progs/redbook/surfpoints.c b/progs/redbook/surfpoints.c new file mode 100644 index 0000000000..094f0dada8 --- /dev/null +++ b/progs/redbook/surfpoints.c @@ -0,0 +1,280 @@ +/* + * Copyright (c) 1993-2003, 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 Unpublished - rights + * reserved under the copyright laws of the United States.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. + * 1500 Crittenden Lane + * Mountain View, CA 94043 + * United State of America + * + * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. + */ + +/* + * surfpoints.c + * This program is a modification of the earlier surface.c + * program. The vertex data are not directly rendered, + * but are instead passed to the callback function. + * The values of the tessellated vertices are printed + * out there. + * + * This program draws a NURBS surface in the shape of a + * symmetrical hill. The 'c' keyboard key allows you to + * toggle the visibility of the control points themselves. + * Note that some of the control points are hidden by the + * surface itself. + */ +#include <GL/glut.h> +#include <stdlib.h> +#include <stdio.h> + +#ifdef GLU_VERSION_1_3 + +#ifndef CALLBACK +#define CALLBACK +#endif + +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 + */ +static 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] = 3.0; + else + ctlpoints[u][v][2] = -3.0; + } + } +} + +static void CALLBACK nurbsError(GLenum errorCode) +{ + const GLubyte *estring; + + estring = gluErrorString(errorCode); + fprintf (stderr, "Nurbs Error: %s\n", estring); + exit (0); +} + +static void CALLBACK beginCallback(GLenum whichType) +{ + glBegin (whichType); /* resubmit rendering directive */ + printf ("glBegin("); + switch (whichType) { /* print diagnostic message */ + case GL_LINES: + printf ("GL_LINES)\n"); + break; + case GL_LINE_LOOP: + printf ("GL_LINE_LOOP)\n"); + break; + case GL_LINE_STRIP: + printf ("GL_LINE_STRIP)\n"); + break; + case GL_TRIANGLES: + printf ("GL_TRIANGLES)\n"); + break; + case GL_TRIANGLE_STRIP: + printf ("GL_TRIANGLE_STRIP)\n"); + break; + case GL_TRIANGLE_FAN: + printf ("GL_TRIANGLE_FAN)\n"); + break; + case GL_QUADS: + printf ("GL_QUADS)\n"); + break; + case GL_QUAD_STRIP: + printf ("GL_QUAD_STRIP)\n"); + break; + case GL_POLYGON: + printf ("GL_POLYGON)\n"); + break; + default: + break; + } +} + +static void CALLBACK endCallback() +{ + glEnd(); /* resubmit rendering directive */ + printf ("glEnd()\n"); +} + +static void CALLBACK vertexCallback(GLfloat *vertex) +{ + glVertex3fv(vertex); /* resubmit rendering directive */ + printf ("glVertex3f (%5.3f, %5.3f, %5.3f)\n", + vertex[0], vertex[1], vertex[2]); +} + +static void CALLBACK normalCallback(GLfloat *normal) +{ + glNormal3fv(normal); /* resubmit rendering directive */ + printf ("glNormal3f (%5.3f, %5.3f, %5.3f)\n", + normal[0], normal[1], normal[2]); +} + +/* Initialize material property and depth buffer. + */ +static void init(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, 0.0); + 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); + glEnable(GL_DEPTH_TEST); + glEnable(GL_AUTO_NORMAL); + glEnable(GL_NORMALIZE); + + init_surface(); + + theNurb = gluNewNurbsRenderer(); + gluNurbsProperty(theNurb, GLU_NURBS_MODE, + GLU_NURBS_TESSELLATOR); + gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0); + gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL); + gluNurbsCallback(theNurb, GLU_ERROR, nurbsError); + gluNurbsCallback(theNurb, GLU_NURBS_BEGIN, beginCallback); + gluNurbsCallback(theNurb, GLU_NURBS_VERTEX, vertexCallback); + gluNurbsCallback(theNurb, GLU_NURBS_NORMAL, normalCallback); + gluNurbsCallback(theNurb, GLU_NURBS_END, endCallback); + +} + +static 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 (0.5, 0.5, 0.5); + + 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(); + glFlush(); +} + +static void reshape(int w, int h) +{ + glViewport(0, 0, (GLsizei) w, (GLsizei) h); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + gluPerspective (45.0, (GLdouble)w/(GLdouble)h, 3.0, 8.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef (0.0, 0.0, -5.0); +} + +static void keyboard(unsigned char key, int x, int y) +{ + switch (key) { + case 'c': + case 'C': + showPoints = !showPoints; + glutPostRedisplay(); + break; + case 27: + exit(0); + break; + default: + break; + } +} + +int main(int argc, char** argv) +{ + glutInit(&argc, argv); + glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); + glutInitWindowSize (500, 500); + glutInitWindowPosition (100, 100); + glutCreateWindow(argv[0]); + init(); + glutReshapeFunc(reshape); + glutDisplayFunc(display); + glutKeyboardFunc (keyboard); + glutMainLoop(); + return 0; +} + +#else +int main(int argc, char** argv) +{ + fprintf (stderr, "This program demonstrates a feature which is introduced in the\n"); + fprintf (stderr, "OpenGL Utility Library (GLU) Version 1.3.\n"); + fprintf (stderr, "If your implementation of GLU has the right extensions,\n"); + fprintf (stderr, "you may be able to modify this program to make it run.\n"); + return 0; +} +#endif + |