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-rw-r--r--progs/samples/nurb.c355
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diff --git a/progs/samples/nurb.c b/progs/samples/nurb.c
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+++ b/progs/samples/nurb.c
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+/*
+ * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the name of
+ * Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "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 BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <GL/glut.h>
+
+
+#ifndef CALLBACK
+#define CALLBACK
+#endif
+
+
+#define INREAL float
+
+#define S_NUMPOINTS 13
+#define S_ORDER 3
+#define S_NUMKNOTS (S_NUMPOINTS + S_ORDER)
+#define T_NUMPOINTS 3
+#define T_ORDER 3
+#define T_NUMKNOTS (T_NUMPOINTS + T_ORDER)
+#define SQRT_TWO 1.41421356237309504880
+
+
+typedef INREAL Point[4];
+
+
+GLenum doubleBuffer;
+
+GLenum expectedError;
+GLint rotX = 40, rotY = 40;
+INREAL sknots[S_NUMKNOTS] = {
+ -1.0, -1.0, -1.0, 0.0, 1.0, 2.0, 3.0, 4.0,
+ 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 9.0, 9.0
+};
+INREAL tknots[T_NUMKNOTS] = {
+ 1.0, 1.0, 1.0, 2.0, 2.0, 2.0
+};
+Point ctlpoints[S_NUMPOINTS][T_NUMPOINTS] = {
+ {
+ {
+ 4.0, 2.0, 2.0, 1.0
+ },
+ {
+ 4.0, 1.6, 2.5, 1.0
+ },
+ {
+ 4.0, 2.0, 3.0, 1.0
+ }
+ },
+ {
+ {
+ 5.0, 4.0, 2.0, 1.0
+ },
+ {
+ 5.0, 4.0, 2.5, 1.0
+ },
+ {
+ 5.0, 4.0, 3.0, 1.0
+ }
+ },
+ {
+ {
+ 6.0, 5.0, 2.0, 1.0
+ },
+ {
+ 6.0, 5.0, 2.5, 1.0
+ },
+ {
+ 6.0, 5.0, 3.0, 1.0
+ }
+ },
+ {
+ {
+ SQRT_TWO*6.0, SQRT_TWO*6.0, SQRT_TWO*2.0, SQRT_TWO
+ },
+ {
+ SQRT_TWO*6.0, SQRT_TWO*6.0, SQRT_TWO*2.5, SQRT_TWO
+ },
+ {
+ SQRT_TWO*6.0, SQRT_TWO*6.0, SQRT_TWO*3.0, SQRT_TWO
+ }
+ },
+ {
+ {
+ 5.2, 6.7, 2.0, 1.0
+ },
+ {
+ 5.2, 6.7, 2.5, 1.0
+ },
+ {
+ 5.2, 6.7, 3.0, 1.0
+ }
+ },
+ {
+ {
+ SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*2.0, SQRT_TWO
+ },
+ {
+ SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*2.5, SQRT_TWO
+ },
+ {
+ SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*3.0, SQRT_TWO
+ }
+ },
+ {
+ {
+ 4.0, 5.2, 2.0, 1.0
+ },
+ {
+ 4.0, 4.6, 2.5, 1.0
+ },
+ {
+ 4.0, 5.2, 3.0, 1.0
+ }
+ },
+ {
+ {
+ SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*2.0, SQRT_TWO
+ },
+ {
+ SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*2.5, SQRT_TWO
+ },
+ {
+ SQRT_TWO*4.0, SQRT_TWO*6.0, SQRT_TWO*3.0, SQRT_TWO
+ }
+ },
+ {
+ {
+ 2.8, 6.7, 2.0, 1.0
+ },
+ {
+ 2.8, 6.7, 2.5, 1.0
+ },
+ {
+ 2.8, 6.7, 3.0, 1.0
+ }
+ },
+ {
+ {
+ SQRT_TWO*2.0, SQRT_TWO*6.0, SQRT_TWO*2.0, SQRT_TWO
+ },
+ {
+ SQRT_TWO*2.0, SQRT_TWO*6.0, SQRT_TWO*2.5, SQRT_TWO
+ },
+ {
+ SQRT_TWO*2.0, SQRT_TWO*6.0, SQRT_TWO*3.0, SQRT_TWO
+ }
+ },
+ {
+ {
+ 2.0, 5.0, 2.0, 1.0
+ },
+ {
+ 2.0, 5.0, 2.5, 1.0
+ },
+ {
+ 2.0, 5.0, 3.0, 1.0
+ }
+ },
+ {
+ {
+ 3.0, 4.0, 2.0, 1.0
+ },
+ {
+ 3.0, 4.0, 2.5, 1.0
+ },
+ {
+ 3.0, 4.0, 3.0, 1.0
+ }
+ },
+ {
+ {
+ 4.0, 2.0, 2.0, 1.0
+ },
+ {
+ 4.0, 1.6, 2.5, 1.0
+ },
+ {
+ 4.0, 2.0, 3.0, 1.0
+ }
+ }
+};
+GLUnurbsObj *theNurbs;
+
+
+static void CALLBACK ErrorCallback(GLenum which)
+{
+
+ if (which != expectedError) {
+ fprintf(stderr, "Unexpected error occured (%d):\n", which);
+ fprintf(stderr, " %s\n", (char *) gluErrorString(which));
+ }
+}
+
+static void Init(void)
+{
+
+ theNurbs = gluNewNurbsRenderer();
+ gluNurbsCallback(theNurbs, GLU_ERROR, ErrorCallback);
+
+ gluNurbsProperty(theNurbs, GLU_SAMPLING_TOLERANCE, 15.0);
+ gluNurbsProperty(theNurbs, GLU_DISPLAY_MODE, GLU_OUTLINE_PATCH);
+
+ expectedError = GLU_INVALID_ENUM;
+ gluNurbsProperty(theNurbs, ~0, 15.0);
+ expectedError = GLU_NURBS_ERROR13;
+ gluEndSurface(theNurbs);
+ expectedError = 0;
+
+ glColor3f(1.0, 1.0, 1.0);
+}
+
+static void Reshape(int width, int height)
+{
+
+ glViewport(0, 0, (GLint)width, (GLint)height);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum(-2.0, 2.0, -2.0, 2.0, 0.8, 10.0);
+ gluLookAt(7.0, 4.5, 4.0, 4.5, 4.5, 2.5, 6.0, -3.0, 2.0);
+ glMatrixMode(GL_MODELVIEW);
+}
+
+static void Key2(int key, int x, int y)
+{
+
+ switch (key) {
+ case GLUT_KEY_DOWN:
+ rotX -= 5;
+ break;
+ case GLUT_KEY_UP:
+ rotX += 5;
+ break;
+ case GLUT_KEY_LEFT:
+ rotY -= 5;
+ break;
+ case GLUT_KEY_RIGHT:
+ rotY += 5;
+ break;
+ default:
+ return;
+ }
+
+ glutPostRedisplay();
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+
+ switch (key) {
+ case 27:
+ exit(1);
+ }
+}
+
+static void Draw(void)
+{
+
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glPushMatrix();
+
+ glTranslatef(4.0, 4.5, 2.5);
+ glRotatef(rotY, 1, 0, 0);
+ glRotatef(rotX, 0, 1, 0);
+ glTranslatef(-4.0, -4.5, -2.5);
+
+ gluBeginSurface(theNurbs);
+ gluNurbsSurface(theNurbs, S_NUMKNOTS, sknots, T_NUMKNOTS, tknots,
+ 4*T_NUMPOINTS, 4, &ctlpoints[0][0][0], S_ORDER,
+ T_ORDER, GL_MAP2_VERTEX_4);
+ gluEndSurface(theNurbs);
+
+ glPopMatrix();
+
+ glFlush();
+
+ if (doubleBuffer) {
+ glutSwapBuffers();
+ }
+}
+
+static GLenum Args(int argc, char **argv)
+{
+ GLint i;
+
+ doubleBuffer = GL_FALSE;
+
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "-sb") == 0) {
+ doubleBuffer = GL_FALSE;
+ } else if (strcmp(argv[i], "-db") == 0) {
+ doubleBuffer = GL_TRUE;
+ } else {
+ printf("%s (Bad option).\n", argv[i]);
+ return GL_FALSE;
+ }
+ }
+ return GL_TRUE;
+}
+
+int main(int argc, char **argv)
+{
+ GLenum type;
+
+ glutInit(&argc, argv);
+
+ if (Args(argc, argv) == GL_FALSE) {
+ exit(1);
+ }
+
+ glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300);
+
+ type = GLUT_RGB;
+ type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
+ glutInitDisplayMode(type);
+
+ if (glutCreateWindow("NURBS Test") == GL_FALSE) {
+ exit(1);
+ }
+
+ Init();
+
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(Key);
+ glutSpecialFunc(Key2);
+ glutDisplayFunc(Draw);
+ glutMainLoop();
+ return 0;
+}