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#! /usr/bin/env python
# *** This only works correctly on a 24 bit-plane machine. ***
#
# A simple Python program that tests the some parts of the
# GL library. It shows the speed that can be obtained when
# doing simple graphics.
#
# The bottleneck in this program is NOT Python but the graphics
# engine; i.e Python can feed the graphics pipeline fast enough
# on the 4D/25G.
#
# This program show 3 kites flying around the screen. It uses
#
# * bgnpolygon, endpolygon
# * v3, n3
# * lmdef, lmbind
#
# Usage :
#
# ESC -> exit program
# MOUSE3 -> freeze toggle
# MOUSE2 -> one step (use this in freeze state)
from GL import *
from gl import *
import DEVICE
from math import *
#
# viewobj : sets the rotation, translation and scaling
# set appropiate material, call drawobject()
#
def viewobj (r, s, t, mat) :
pushmatrix()
rot (r * 10.0, 'X')
rot (r * 10.0, 'Y')
rot (r * 10.0, 'Z')
scale (s[0], s[1], s[2])
translate (t[0], t[1], t[2])
lmbind(MATERIAL, mat)
drawobject()
popmatrix()
#
# makeobj : the contructor of the object
#
def mkobj () :
v0 = (-5.0 ,0.0, 0.0)
v1 = (0.0 ,5.0, 0.0)
v2 = (5.0 ,0.0, 0.0)
v3 = (0.0 ,2.0, 0.0)
n0 = (sqrt(2.0)/2.0, sqrt(2.0)/2.0, 0.0)
vn = ((v0, n0), (v1, n0), (v2, n0), (v3, n0))
#
return vn
#
# the object itself as an array of vertices and normals
#
kite = mkobj ()
#
# drawobject : draw a triangle. with bgnpolygon
#
def drawobject () :
#
bgnpolygon()
vnarray (kite)
endpolygon()
#
# identity matrix
#
idmat=[1.0,0.0,0.0,0.0,0.0,1.0,0.0,0.0,0.0,0.0,1.0,0.0,0.0,0.0,0.0,1.0]
#
# the rgb-value of light-blue
#
LightBlue = (43,169,255)
#
# the different materials.
#
m1=[SPECULAR,0.0,0.0,0.6,DIFFUSE,0.0,0.0,0.8,SHININESS,20.0,LMNULL]
m2=[SPECULAR,0.8,0.0,0.1,DIFFUSE,0.8,0.0,0.3,SHININESS,120.0,LMNULL]
m3=[SPECULAR,0.0,1.0,0.0,DIFFUSE,0.0,0.6,0.0,SHININESS,120.0,LMNULL]
#
# lightsources
#
light1 = [LCOLOR,1.0,1.0,1.0,POSITION,15.0,15.0,0.0,1.0,LMNULL]
light2 = [LCOLOR,1.0,1.0,1.0,POSITION,-15.0,15.0,0.0,1.0,LMNULL]
#
# the lightmodel
#
model = [AMBIENT,0.2,0.2,0.2,LMNULL]
#
# initgl : opens the window, configures the pipeline to 2buf and zbuf,
# sets the viewing, defines and binds the materials
#
def initgl () :
#
# open window
#
foreground ()
keepaspect (1, 1)
prefposition (100, 500, 100, 500)
w = winopen ('PYTHON lights')
keepaspect (1, 1)
winconstraints()
#
# configure pipeline (zbuf, 2buf, GOURAUD and RGBmode)
#
zbuffer (1)
doublebuffer ()
shademodel (GOURAUD)
RGBmode ()
gconfig ()
#
# define and bind materials (set perspective BEFORE loadmat !)
#
mmode(MVIEWING)
perspective (900, 1.0, 1.0, 20.0)
loadmatrix(idmat)
lmdef(DEFMATERIAL, 1, m1)
lmdef(DEFMATERIAL, 2, m2)
lmdef(DEFMATERIAL, 3, m3)
lmdef(DEFLIGHT, 1, light1)
lmdef(DEFLIGHT, 2, light2)
lmdef(DEFLMODEL, 1, model)
lmbind(LIGHT0,1)
lmbind(LIGHT1,2)
lmbind(LMODEL,1)
#
# set viewing
#
lookat (0.0, 0.0, 10.0, 0.0, 0.0, 0.0, 0)
#
# ask for the REDRAW and ESCKEY events
#
qdevice(DEVICE.MOUSE3)
qdevice(DEVICE.MOUSE2)
qdevice(DEVICE.REDRAW)
qdevice(DEVICE.ESCKEY)
#
# GoForIT : use 2buf to redraw the object 2n times. index i is used as
# the (smoothly changing) rotation angle
#
def GoForIt(i) :
freeze = 1
while 1 :
if freeze <> 0 :
i = i + 1
#
# clear z-buffer and clear background to light-blue
#
zclear()
c3i (LightBlue)
clear()
#
# draw the 3 traiangles scaled above each other.
#
viewobj(float(i),[1.0,1.0,1.0],[1.0,1.0,1.0],1)
viewobj(float(i),[0.75,0.75,0.75],[0.0,2.0,2.0],2)
viewobj(float(i),[0.5,0.5,0.5],[0.0,4.0,4.0],3)
#
swapbuffers()
#
if qtest() <> 0 :
dev, val = qread()
if dev == DEVICE.ESCKEY :
break
elif dev == DEVICE.REDRAW :
reshapeviewport ()
elif dev == DEVICE.MOUSE3 and val <> 0 :
freeze = 1 - freeze
elif dev == DEVICE.MOUSE2 and val <> 0 :
i = i + 1
# the main program
#
def main () :
initgl ()
GoForIt (0)
#
# exec main
#
main ()
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