fogtst.c
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上传日期:2007-05-28
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- /* Copyright (c) Mark J. Kilgard, 1994. */
- /**
- * (c) Copyright 1993, 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- * Unpublished-- rights reserved under the copyright laws of the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., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
- *
- * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
- */
- #include <stdio.h>
- #include <string.h>
- #include <stdlib.h>
- #include <GL/glut.h>
- GLenum doubleBuffer;
- double plane[4] = {
- 1.0, 0.0, -1.0, 0.0
- };
- float rotX = 5.0, rotY = -5.0, zTranslate = -65.0;
- float fogDensity = 0.02;
- GLint cubeList = 1;
- float scp[18][3] = {
- {1.000000, 0.000000, 0.000000},
- {1.000000, 0.000000, 5.000000},
- {0.707107, 0.707107, 0.000000},
- {0.707107, 0.707107, 5.000000},
- {0.000000, 1.000000, 0.000000},
- {0.000000, 1.000000, 5.000000},
- {-0.707107, 0.707107, 0.000000},
- {-0.707107, 0.707107, 5.000000},
- {-1.000000, 0.000000, 0.000000},
- {-1.000000, 0.000000, 5.000000},
- {-0.707107, -0.707107, 0.000000},
- {-0.707107, -0.707107, 5.000000},
- {0.000000, -1.000000, 0.000000},
- {0.000000, -1.000000, 5.000000},
- {0.707107, -0.707107, 0.000000},
- {0.707107, -0.707107, 5.000000},
- {1.000000, 0.000000, 0.000000},
- {1.000000, 0.000000, 5.000000},
- };
- static float ambient[] = {0.1, 0.1, 0.1, 1.0};
- static float diffuse[] = {1.0, 1.0, 1.0, 1.0};
- static float position[] = {90.0, 90.0, 0.0, 0.0};
- static float front_mat_shininess[] = {30.0};
- static float front_mat_specular[] = {0.0, 0.0, 0.0, 1.0};
- static float front_mat_diffuse[] = {0.0, 1.0, 0.0, 1.0};
- static float back_mat_shininess[] = {50.0};
- static float back_mat_specular[] = {0.0, 0.0, 1.0, 1.0};
- static float back_mat_diffuse[] = {1.0, 0.0, 0.0, 1.0};
- static float lmodel_ambient[] = {0.0, 0.0, 0.0, 1.0};
- static float fog_color[] = {0.8, 0.8, 0.8, 1.0};
- /* ARGSUSED1 */
- static void
- Key(unsigned char key, int x, int y)
- {
- switch (key) {
- case 'd':
- fogDensity *= 1.10;
- glFogf(GL_FOG_DENSITY, fogDensity);
- glutPostRedisplay();
- break;
- case 'D':
- fogDensity /= 1.10;
- glFogf(GL_FOG_DENSITY, fogDensity);
- glutPostRedisplay();
- break;
- case 27:
- exit(0);
- }
- }
- /* ARGSUSED1 */
- static void
- SpecialKey(int key, int x, int y)
- {
- switch (key) {
- case GLUT_KEY_UP:
- rotX -= 5;
- glutPostRedisplay();
- break;
- case GLUT_KEY_DOWN:
- rotX += 5;
- glutPostRedisplay();
- break;
- case GLUT_KEY_LEFT:
- rotY -= 5;
- glutPostRedisplay();
- break;
- case GLUT_KEY_RIGHT:
- rotY += 5;
- glutPostRedisplay();
- break;
- }
- }
- static void
- Draw(void)
- {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glPushMatrix();
- glTranslatef(0, 0, zTranslate);
- /* XXX hooky dual axis rotation! */
- glRotatef(rotY, 0, 1, 0);
- glRotatef(rotX, 1, 0, 0);
- glScalef(1.0, 1.0, 10.0);
- glCallList(cubeList);
- glPopMatrix();
- if (doubleBuffer) {
- glutSwapBuffers();
- } else {
- glFlush();
- }
- }
- static void
- Args(int argc, char **argv)
- {
- GLint i;
- doubleBuffer = GL_TRUE;
- 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;
- }
- }
- }
- int
- main(int argc, char **argv)
- {
- GLenum type;
- glutInit(&argc, argv);
- Args(argc, argv);
- type = GLUT_RGB | GLUT_DEPTH;
- type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
- glutInitDisplayMode(type);
- glutInitWindowSize(300, 300);
- glutCreateWindow("Fog Test");
- glFrontFace(GL_CW);
- glEnable(GL_DEPTH_TEST);
- glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
- glLightfv(GL_LIGHT0, GL_POSITION, position);
- glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
- glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- glMaterialfv(GL_FRONT, GL_SHININESS, front_mat_shininess);
- glMaterialfv(GL_FRONT, GL_SPECULAR, front_mat_specular);
- glMaterialfv(GL_FRONT, GL_DIFFUSE, front_mat_diffuse);
- glMaterialfv(GL_BACK, GL_SHININESS, back_mat_shininess);
- glMaterialfv(GL_BACK, GL_SPECULAR, back_mat_specular);
- glMaterialfv(GL_BACK, GL_DIFFUSE, back_mat_diffuse);
- glEnable(GL_FOG);
- glFogi(GL_FOG_MODE, GL_EXP);
- glFogf(GL_FOG_DENSITY, fogDensity);
- glFogfv(GL_FOG_COLOR, fog_color);
- glClearColor(0.8, 0.8, 0.8, 1.0);
- /* *INDENT-OFF* */
- glNewList(cubeList, GL_COMPILE);
- glBegin(GL_TRIANGLE_STRIP);
- glNormal3fv(scp[0]);
- glVertex3fv(scp[0]);
- glNormal3fv(scp[0]);
- glVertex3fv(scp[1]);
- glNormal3fv(scp[2]);
- glVertex3fv(scp[2]);
- glNormal3fv(scp[2]);
- glVertex3fv(scp[3]);
- glNormal3fv(scp[4]);
- glVertex3fv(scp[4]);
- glNormal3fv(scp[4]);
- glVertex3fv(scp[5]);
- glNormal3fv(scp[6]);
- glVertex3fv(scp[6]);
- glNormal3fv(scp[6]);
- glVertex3fv(scp[7]);
- glNormal3fv(scp[8]);
- glVertex3fv(scp[8]);
- glNormal3fv(scp[8]);
- glVertex3fv(scp[9]);
- glNormal3fv(scp[10]);
- glVertex3fv(scp[10]);
- glNormal3fv(scp[10]);
- glVertex3fv(scp[11]);
- glNormal3fv(scp[12]);
- glVertex3fv(scp[12]);
- glNormal3fv(scp[12]);
- glVertex3fv(scp[13]);
- glNormal3fv(scp[14]);
- glVertex3fv(scp[14]);
- glNormal3fv(scp[14]);
- glVertex3fv(scp[15]);
- glNormal3fv(scp[16]);
- glVertex3fv(scp[16]);
- glNormal3fv(scp[16]);
- glVertex3fv(scp[17]);
- glEnd();
- glEndList();
- /* *INDENT-ON* */
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluPerspective(45.0, 1.0, 1.0, 200.0);
- glMatrixMode(GL_MODELVIEW);
- glutKeyboardFunc(Key);
- glutSpecialFunc(SpecialKey);
- glutDisplayFunc(Draw);
- glutMainLoop();
- return 0; /* ANSI C requires main to return int. */
- }