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#!
# 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* Unpublished-- rights reserved under the copyright laws of the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():
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)
glutSwapBuffers()
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 ['f','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()
def main():
# Main Loop
# Open window with initial window size, title bar,
# RGBA display mode, depth buffer, and handle input events.
glutInit(sys.argv)
glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB );
glutInitWindowSize(500, 500)
glutCreateWindow('fog')
init()
glutReshapeFunc(reshape)
glutKeyboardFunc(keyboard)
glutDisplayFunc(display)
glutMainLoop()
if __name__ == "__main__":
main()
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