[PyOpenGL-Users] Problem with glDrawPixels!

[William J. P. <wjp...@un...>]

I am trying to use glDrawPixels, and I have looked at the example on the
webpage but I still cannot get this gl call to function properly.  I've
created a small sample program that should simply use glDrawPixels to
turn the canvas red after you click the button labeled 'call
glDrawpixels' and then click on the canvas.  All I get is some random
gray.  Does anyone have any idea what I am doing wrong.  My code is
below.  Thanks!

	-- Jake

from OpenGL.GL import *
from OpenGL.Tk import *
from Tkinter import *


def gl_test(o):
	
	glClearColor(0.0, 0.0, 1.0, 0)
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
	
	image=[]
	i=0
	while i<(256*256):
		image.append(255)
		image.append(0)
		image.append(0)
		i=i+1
	
	glPixelStorei(GL_PACK_ALIGNMENT, 1)
	glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
	glMatrixMode(GL_PROJECTION)
	
	glLoadIdentity()
	gluOrtho2D(0.0, 1.0, 0.0, 1.0)
	glViewport(0.0, 0.0, 256.0, 256.0)
	glMatrixMode(GL_MODELVIEW)
	glPushMatrix()
	glLoadIdentity()
	
	glDrawPixels(256, 256, GL_RGB, GL_UNSIGNED_BYTE, image)
	glFlush()
		
	glPopMatrix()
	
	
	print 'in gl_test..'

def new_redraw(o):
	o.redraw=gl_test
	print 'in new_redraw'
	
def redraw(o):
	glClearColor(0.0, 0.0, 0.0, 0)
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
	
	print 'in redraw'

widget = Frame()
widget.pack()

l=Label(widget, text='glDrawpixels test')
l.pack(side=TOP)

canvas=Opengl(widget, width=256, height=256, double=1)
canvas.redraw=redraw
canvas.pack(side=TOP)

b=Button(widget, text='Call glDrawpixels', command=(lambda:
new_redraw(canvas)))
b.pack(side=TOP)

widget.mainloop()