#!python
# -*- mode: python; Encoding: utf-8; coding: utf-8 -*-
# Last updated: <2018/11/09 02:47:59 +0900>
u"""
Draw teapot.

WindowsのPythonでOpenGLを使う - TadaoYamaokaの日記
http://tadaoyamaoka.hatenablog.com/entry/2017/02/28/064625

Windows10 x64 + Python 2.7.15 32bit + PyOpenGL 3.1.1
"""


from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
import sys

SCRW, SCRH = 512, 512

def main():
    glutInit(sys.argv)
    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH)
    glutInitWindowSize(SCRW, SCRH)   # window size
    glutInitWindowPosition(100, 100) # window position
    glutCreateWindow(b"teapot")      # show window
    glutDisplayFunc(display)         # draw callback function
    glutReshapeFunc(reshape)         # resize callback function
    init(SCRW, SCRH)
    glutMainLoop()

def init(width, height):
    """ initialize """
    glClearColor(0.0, 0.0, 0.0, 1.0)
    glEnable(GL_DEPTH_TEST) # enable shading

    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    
    ##set perspective
    gluPerspective(45.0, float(width) / float(height), 0.1, 100.0)

def display():
    """ display """
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
    glMatrixMode(GL_MODELVIEW)
    glLoadIdentity()
    
    ##set camera
    gluLookAt(0.0, 1.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
    
    ##draw a teapot
    glColor3f(1.0, 0.0, 0.0)
    glutWireTeapot(1.0)   # wireframe
    # glutSolidTeapot(1.0)  # solid
    
    glFlush()  # enforce OpenGL command

def reshape(width, height):
    """callback function resize window"""
    glViewport(0, 0, width, height)
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    gluPerspective(45.0, float(width)/float(height), 0.1, 100.0)

if __name__ == "__main__":
    main()