#!/usr/bin/env python

## example python/pyopengl script to do tiled texturemapping.
## By david konerding (dek@cgl.ucsf.edu)

import sys, Image
from OpenGL import Tk
from OpenGL.GL import *

class checker:

    def makeImage(self, filename='NeHe.bmp'):
 	im = Image.open(filename)
	self.imageWidth = im.size[0]
	self.imageHeight = im.size[1]
 	self.image = im.tostring("raw", "RGBX", 0, -1)
	
    def display(self, event=None):
    	glDisable(GL_TEXTURE_2D)
	glScissor(000,000,250,500)
	glClearColor(1.0, 0.0, 0.0, 0)
	glClear(GL_COLOR_BUFFER_BIT)

	glScissor(125,125,250,250)
	glClearColor(0.0, 0.0, 1.0, 0)
	glClear(GL_COLOR_BUFFER_BIT)

	glScissor(0,0,500,500)

    	glEnable(GL_TEXTURE_2D)
	glBegin(GL_QUADS)
	glTexCoord2f(0.0, 0.0);	glVertex3f(0.0, 0.0, 0.0)
	glTexCoord2f(0.0, 2.0);	glVertex3f(0.0, 10., 0.0)
	glTexCoord2f(2.0, 2.0);	glVertex3f(10. , 10., 0.0)
	glTexCoord2f(2.0, 0.0);	glVertex3f(10., 0.0, 0.0)
	glEnd()

	glFlush()

    def SetupWindow(self):
	self.OglFrame = Tk.Frame()
	self.OglFrame.pack(side = 'top')
	self.QuitButton = Tk.Button(self.OglFrame, {'text':'Quit'})
	self.QuitButton.bind('<ButtonRelease-1>', sys.exit)
	self.QuitButton.pack({'side':'top'})
	self.ogl = Tk.Opengl(master=self.OglFrame, width = 500, height = 500, double = 1)
	self.ogl.pack(side = 'top', expand = 1, fill = 'both')
##	self.ogl.set_eyepoint(900.)
##	self.ogl.set_centerpoint(0, 0, 0)
	self.ogl.redraw = self.display
	# Basic 2D clipping of output. Works fine. Viewport would be used to reorient the output.
	#glScissor(100,100,300,300)
	glEnable(GL_SCISSOR_TEST)
	self.SetupTexture()


    def SetupTexture(self):
	self.makeImage()
	glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
	glTexImage2D(GL_TEXTURE_2D, 0, 3, self.imageWidth, self.imageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,  self.image)
 	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP)
 	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP)
 	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
 	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL)
	glEnable(GL_TEXTURE_2D)
	glShadeModel(GL_FLAT)


    def __init__(self):
	self.SetupWindow()
	self.ogl.mainloop()

if __name__ == '__main__':
    checker()