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Diffstat (limited to 'progs/samples/nurb.c')
| -rw-r--r-- | progs/samples/nurb.c | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/progs/samples/nurb.c b/progs/samples/nurb.c new file mode 100644 index 0000000000..f90c6ee91f --- /dev/null +++ b/progs/samples/nurb.c @@ -0,0 +1,355 @@ +/* + * 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; +} |