Centre Blaise Pascal » Python OpenGL pour les Nuls

#!/usr/bin/python

# This is statement is required by the build system to query build info

if __name__ == '__build__':

        raise(Exception)

'''

fog.c from the Redbook examples.  

Converted to Python by Jason L. Petrone 7/00

/*

 * Copyright (c) 1993-1997, 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 * Unpublished-- rights reserved under the copyright laws of the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(R) is a registered trademark of Silicon Graphics, Inc.

 */

'''

'''

/*

 *  fog.c

 *  This program draws 5 red spheres, each at a different 

 *  z distance from the eye, in different types of fog.  

 *  Pressing the f key chooses between 3 types of 

 *  fog:  exponential, exponential squared, and linear.  

 *  In this program, there is a fixed density value, as well 

 *  as fixed start and end values for the linear fog.

 */

'''

import sys

try:

  from OpenGL.GLUT import *

  from OpenGL.GL import *

except:

  print('''

ERROR: PyOpenGL not installed properly.  

        ''')

  sys.exit()

#  Initialize depth buffer, fog, light source, 

#  material property, and lighting model.

def init():

   position = [ 0.5, 0.5, 3.0, 0.0 ]

   glEnable(GL_DEPTH_TEST)

   glLightfv(GL_LIGHT0, GL_POSITION, position)

   glEnable(GL_LIGHTING)

   glEnable(GL_LIGHT0)

   mat = [0.1745, 0.01175, 0.01175, 1.0]

   glMaterialfv(GL_FRONT, GL_AMBIENT, mat)

   mat[0] = 0.61424; mat[1] = 0.04136; mat[2] = 0.04136

   glMaterialfv(GL_FRONT, GL_DIFFUSE, mat)

   mat[0] = 0.727811; mat[1] = 0.626959; mat[2] = 0.626959

   glMaterialfv(GL_FRONT, GL_SPECULAR, mat)

   glMaterialf(GL_FRONT, GL_SHININESS, 0.6*128.0)

   glEnable(GL_FOG)

   fogColor = [0.5, 0.5, 0.5, 1.0]

   global fogMode

   fogMode = GL_EXP

   glFogi (GL_FOG_MODE, fogMode)

   glFogfv (GL_FOG_COLOR, fogColor)

   glFogf (GL_FOG_DENSITY, 0.35)

   glHint (GL_FOG_HINT, GL_DONT_CARE)

   glFogf (GL_FOG_START, 1.0)

   glFogf (GL_FOG_END, 5.0)

   glClearColor(0.5, 0.5, 0.5, 1.0)

def renderSphere(x, y, z):

   glPushMatrix()

   glTranslatef (x, y, z)

   glutSolidSphere(0.4, 16, 16)

   glPopMatrix()

# display() draws 5 spheres at different z positions.

def display():

   print('redisplay')

   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

   renderSphere (-2., -0.5, -1.0)

   renderSphere (-1., -0.5, -2.0)

   renderSphere (0., -0.5, -3.0)

   renderSphere (1., -0.5, -4.0)

   renderSphere (2., -0.5, -5.0)

   glFlush()

def reshape(w, h):

  glViewport(0, 0, w, h)

  glMatrixMode(GL_PROJECTION)

  glLoadIdentity()

  if (w <= h):

     glOrtho(-2.5, 2.5, -2.5*h/w, 2.5*h/w, -10.0, 10.0)

  else:

     glOrtho(-2.5*w/h, 2.5*w/h, -2.5, 2.5, -10.0, 10.0)

  glMatrixMode(GL_MODELVIEW)

  glLoadIdentity()

def keyboard(key, x, y):

  global fogMode

  if key in [b'f',b'F']:

    if (fogMode == GL_EXP):

      fogMode = GL_EXP2;

      print("Fog mode is GL_EXP2")

    elif (fogMode == GL_EXP2):

      fogMode = GL_LINEAR

      print("Fog mode is GL_LINEAR")

    elif (fogMode == GL_LINEAR):

      fogMode = GL_EXP

      print("Fog mode is GL_EXP")

    glFogi(GL_FOG_MODE, fogMode)

    glutPostRedisplay()

  elif ord(key) == 27:

    sys.exit()

#  Main Loop

#  Open window with initial window size, title bar, 

#  RGBA display mode, depth buffer, and handle input events.

glutInit(sys.argv)

glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);

glutInitWindowSize(500, 500)

glutCreateWindow(b'fog')

init()

glutReshapeFunc(reshape)

glutKeyboardFunc(keyboard)

glutDisplayFunc(display)

glutMainLoop()