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