WIP - port to Mali EGL
[mesa-demos/mali.git] / src / redbook / surfpoints.c
blobd29e69f03b91ea9204ef34f1ae84087cbb65495f
1 /*
2 * Copyright (c) 1993-2003, Silicon Graphics, Inc.
3 * All Rights Reserved
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose and without fee is hereby granted, provided that the above
7 * copyright notice appear in all copies and that both the copyright
8 * notice and this permission notice appear in supporting documentation,
9 * and that the name of Silicon Graphics, Inc. not be used in
10 * advertising or publicity pertaining to distribution of the software
11 * without specific, written prior permission.
13 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" AND
14 * WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
16 * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
17 * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
18 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 * OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, LOSS OF
20 * PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD
21 * PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN ADVISED OF
22 * THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF
23 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE
24 * OR PERFORMANCE OF THIS SOFTWARE.
26 * US Government Users Restricted Rights
27 * Use, duplication, or disclosure by the Government is subject to
28 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
29 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
30 * clause at DFARS 252.227-7013 and/or in similar or successor clauses
31 * in the FAR or the DOD or NASA FAR Supplement. Unpublished - rights
32 * reserved under the copyright laws of the United States.
34 * Contractor/manufacturer is:
35 * Silicon Graphics, Inc.
36 * 1500 Crittenden Lane
37 * Mountain View, CA 94043
38 * United State of America
40 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
44 * surfpoints.c
45 * This program is a modification of the earlier surface.c
46 * program. The vertex data are not directly rendered,
47 * but are instead passed to the callback function.
48 * The values of the tessellated vertices are printed
49 * out there.
51 * This program draws a NURBS surface in the shape of a
52 * symmetrical hill. The 'c' keyboard key allows you to
53 * toggle the visibility of the control points themselves.
54 * Note that some of the control points are hidden by the
55 * surface itself.
57 #include "glut_wrap.h"
58 #include <stdlib.h>
59 #include <stdio.h>
61 #ifdef GLU_VERSION_1_3
63 GLfloat ctlpoints[4][4][3];
64 int showPoints = 0;
66 GLUnurbsObj *theNurb;
69 * Initializes the control points of the surface to a small hill.
70 * The control points range from -3 to +3 in x, y, and z
72 static void init_surface(void)
74 int u, v;
75 for (u = 0; u < 4; u++) {
76 for (v = 0; v < 4; v++) {
77 ctlpoints[u][v][0] = 2.0*((GLfloat)u - 1.5);
78 ctlpoints[u][v][1] = 2.0*((GLfloat)v - 1.5);
80 if ( (u == 1 || u == 2) && (v == 1 || v == 2))
81 ctlpoints[u][v][2] = 3.0;
82 else
83 ctlpoints[u][v][2] = -3.0;
88 static void GLAPIENTRY nurbsError(GLenum errorCode)
90 const GLubyte *estring;
92 estring = gluErrorString(errorCode);
93 fprintf (stderr, "Nurbs Error: %s\n", estring);
94 exit (0);
97 static void GLAPIENTRY beginCallback(GLenum whichType)
99 glBegin (whichType); /* resubmit rendering directive */
100 printf ("glBegin(");
101 switch (whichType) { /* print diagnostic message */
102 case GL_LINES:
103 printf ("GL_LINES)\n");
104 break;
105 case GL_LINE_LOOP:
106 printf ("GL_LINE_LOOP)\n");
107 break;
108 case GL_LINE_STRIP:
109 printf ("GL_LINE_STRIP)\n");
110 break;
111 case GL_TRIANGLES:
112 printf ("GL_TRIANGLES)\n");
113 break;
114 case GL_TRIANGLE_STRIP:
115 printf ("GL_TRIANGLE_STRIP)\n");
116 break;
117 case GL_TRIANGLE_FAN:
118 printf ("GL_TRIANGLE_FAN)\n");
119 break;
120 case GL_QUADS:
121 printf ("GL_QUADS)\n");
122 break;
123 case GL_QUAD_STRIP:
124 printf ("GL_QUAD_STRIP)\n");
125 break;
126 case GL_POLYGON:
127 printf ("GL_POLYGON)\n");
128 break;
129 default:
130 break;
134 static void GLAPIENTRY endCallback()
136 glEnd(); /* resubmit rendering directive */
137 printf ("glEnd()\n");
140 static void GLAPIENTRY vertexCallback(GLfloat *vertex)
142 glVertex3fv(vertex); /* resubmit rendering directive */
143 printf ("glVertex3f (%5.3f, %5.3f, %5.3f)\n",
144 vertex[0], vertex[1], vertex[2]);
147 static void GLAPIENTRY normalCallback(GLfloat *normal)
149 glNormal3fv(normal); /* resubmit rendering directive */
150 printf ("glNormal3f (%5.3f, %5.3f, %5.3f)\n",
151 normal[0], normal[1], normal[2]);
154 /* Initialize material property and depth buffer.
156 static void init(void)
158 GLfloat mat_diffuse[] = { 0.7, 0.7, 0.7, 1.0 };
159 GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
160 GLfloat mat_shininess[] = { 100.0 };
162 glClearColor (0.0, 0.0, 0.0, 0.0);
163 glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
164 glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
165 glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
167 glEnable(GL_LIGHTING);
168 glEnable(GL_LIGHT0);
169 glEnable(GL_DEPTH_TEST);
170 glEnable(GL_AUTO_NORMAL);
171 glEnable(GL_NORMALIZE);
173 init_surface();
175 theNurb = gluNewNurbsRenderer();
176 gluNurbsProperty(theNurb, GLU_NURBS_MODE,
177 GLU_NURBS_TESSELLATOR);
178 gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0);
179 gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
180 gluNurbsCallback(theNurb, GLU_ERROR, nurbsError);
181 gluNurbsCallback(theNurb, GLU_NURBS_BEGIN, beginCallback);
182 gluNurbsCallback(theNurb, GLU_NURBS_VERTEX, vertexCallback);
183 gluNurbsCallback(theNurb, GLU_NURBS_NORMAL, normalCallback);
184 gluNurbsCallback(theNurb, GLU_NURBS_END, endCallback);
188 static void display(void)
190 GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
191 int i, j;
193 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
195 glPushMatrix();
196 glRotatef(330.0, 1.,0.,0.);
197 glScalef (0.5, 0.5, 0.5);
199 gluBeginSurface(theNurb);
200 gluNurbsSurface(theNurb,
201 8, knots, 8, knots,
202 4 * 3, 3, &ctlpoints[0][0][0],
203 4, 4, GL_MAP2_VERTEX_3);
204 gluEndSurface(theNurb);
206 if (showPoints) {
207 glPointSize(5.0);
208 glDisable(GL_LIGHTING);
209 glColor3f(1.0, 1.0, 0.0);
210 glBegin(GL_POINTS);
211 for (i = 0; i < 4; i++) {
212 for (j = 0; j < 4; j++) {
213 glVertex3f(ctlpoints[i][j][0],
214 ctlpoints[i][j][1], ctlpoints[i][j][2]);
217 glEnd();
218 glEnable(GL_LIGHTING);
220 glPopMatrix();
221 glFlush();
224 static void reshape(int w, int h)
226 glViewport(0, 0, (GLsizei) w, (GLsizei) h);
227 glMatrixMode(GL_PROJECTION);
228 glLoadIdentity();
229 gluPerspective (45.0, (GLdouble)w/(GLdouble)h, 3.0, 8.0);
230 glMatrixMode(GL_MODELVIEW);
231 glLoadIdentity();
232 glTranslatef (0.0, 0.0, -5.0);
235 static void keyboard(unsigned char key, int x, int y)
237 switch (key) {
238 case 'c':
239 case 'C':
240 showPoints = !showPoints;
241 glutPostRedisplay();
242 break;
243 case 27:
244 exit(0);
245 break;
246 default:
247 break;
251 int main(int argc, char** argv)
253 glutInit(&argc, argv);
254 glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
255 glutInitWindowSize (500, 500);
256 glutInitWindowPosition (100, 100);
257 glutCreateWindow(argv[0]);
258 init();
259 glutReshapeFunc(reshape);
260 glutDisplayFunc(display);
261 glutKeyboardFunc (keyboard);
262 glutMainLoop();
263 return 0;
266 #else
267 int main(int argc, char** argv)
269 fprintf (stderr, "This program demonstrates a feature which is introduced in the\n");
270 fprintf (stderr, "OpenGL Utility Library (GLU) Version 1.3.\n");
271 fprintf (stderr, "If your implementation of GLU has the right extensions,\n");
272 fprintf (stderr, "you may be able to modify this program to make it run.\n");
273 return 0;
275 #endif