""" Lab exercise on texture mapping.  Buffy on all six faces of a cube.

   Scott D. Anderson
   Fall 2004

Ported to Python, Fall 2009
"""

import sys

try:
    from TW import *
except:
    print '''
ERROR: Couldn't import TW.
        '''

### ================================================================

def display():
    twDisplayInit();
    twCamera();

    glEnable(GL_TEXTURE_2D);

    glBegin(GL_QUADS);
    ## front
    glTexCoord2f(0,0); glVertex3f( 0,1,1);
    glTexCoord2f(0,1); glVertex3f( 0,0,1); 
    glTexCoord2f(1,1); glVertex3f( 1,0,1); 
    glTexCoord2f(1,0); glVertex3f( 1,1,1); 
    ## top 
    glTexCoord2f(0,0); glVertex3f( 0,1,1); 
    glTexCoord2f(0,1); glVertex3f( 1,1,1); 
    glTexCoord2f(1,1); glVertex3f( 1,1,0); 
    glTexCoord2f(1,0); glVertex3f( 0,1,0); 
    ## left
    glTexCoord2f(0,0); glVertex3f( 0,1,1); 
    glTexCoord2f(0,1); glVertex3f( 0,1,0); 
    glTexCoord2f(1,1); glVertex3f( 0,0,0); 
    glTexCoord2f(1,0); glVertex3f( 0,0,1); 

    glEnd();

    glFlush();
    glutSwapBuffers();

### ================================================================

def main():
    glutInit(sys.argv)
    glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)
    twBoundingBox(0,1,0,1,0,1);
    twInitWindowSize(500,500)
    glutCreateWindow(sys.argv[0])
    glutDisplayFunc(display)
    twMainInit()
    if len(sys.argv) < 2:
        twPPM_Tex2D(twPathname("buffy256.ppm",False))
    else:
        twPPM_Tex2D(twPathname(sys.argv[1],True))
    glutMainLoop()

if __name__ == '__main__':
  main()