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