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Python Open Source » Development » PyObjC 
PyObjC » trunk » pyobjc » PyOpenGL 2.0.2.01 » OpenGL » Demo » NeHe » lesson6.py
#!

# This is statement is required by the build system to query build info
if __name__ == '__build__':
  raise Exception

import string
__version__ = string.split('$Revision: 1.8 $')[1]
__date__ = string.join(string.split('$Date: 2002/12/31 04:13:56 $')[1:3], ' ')
__author__ = 'Tarn Weisner Burton <twburton@users.sourceforge.net>'

#
# Ported to PyOpenGL 2.0 by Tarn Weisner Burton 10May2001
#
# This code was created by Richard Campbell '99 (ported to Python/PyOpenGL by John Ferguson 2000)
#
# The port was based on the lesson5 tutorial module by Tony Colston (tonetheman@hotmail.com).  
#
# If you've found this code useful, please let me know (email John Ferguson at hakuin@voicenet.com).
#
# See original source and C based tutorial at http:#nehe.gamedev.net
#
# Note:
# -----
# Now, I assume you've read the prior tutorial notes and know the deal here.  The one major, new requirement
# is to have a working version of PIL (Python Image Library) on your machine.
#
# General Users:
# --------------
# I think to use textures at all you need Nunmeric Python, I tried without it and BAM Python didn't "like" the texture API.
#
# Win32 Users:
# ------------
# Well, here's the install I used to get it working:
# [1] py152.exe - include the TCL install!
# [2] PyOpenGL.EXE - probably the latest, the Vaults notes should give you a clue.
# [3] Distutils-0.9.win32.exe for step #4
# [4] Numerical-15.3.tgz - run the setup.py (need VC++ on your machine, otherwise, have fun with #3, it looks fixable to use gCC).
#
# Win98 users (yes Win98, I have Mandrake on the other partition okay?), you need to the Tcl bin directory in your PATH, not PYTHONPATH,
# just the DOS PATH.
#
# BTW, since this is Python make sure you use tabs or spaces to indent, I had numerous problems since I 
# was using editors that were not sensitive to Python.
#
from OpenGL.GL import *
from OpenGL.GLUT import *
from OpenGL.GLU import *
import sys
from Image import *

# Some api in the chain is translating the keystrokes to this octal string
# so instead of saying: ESCAPE = 27, we use the following.
ESCAPE = '\033'

# Number of the glut window.
window = 0

# Rotations for cube. 
xrot = yrot = zrot = 0.0

texture = 0

def LoadTextures():
    #global texture
    image = open("NeHe.bmp")
  
    ix = image.size[0]
    iy = image.size[1]
    image = image.tostring("raw", "RGBX", 0, -1)
  
    # Create Texture  
    glBindTexture(GL_TEXTURE_2D, glGenTextures(1))   # 2d texture (x and y size)
  
    glPixelStorei(GL_UNPACK_ALIGNMENT,1)
    glTexImage2D(GL_TEXTURE_2D, 0, 3, ix, iy, 0, GL_RGBA, GL_UNSIGNED_BYTE, 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)

# A general OpenGL initialization function.  Sets all of the initial parameters. 
def InitGL(Width, Height):        # We call this right after our OpenGL window is created.
    LoadTextures()
    glEnable(GL_TEXTURE_2D)
    glClearColor(0.0, 0.0, 0.0, 0.0)  # This Will Clear The Background Color To Black
    glClearDepth(1.0)          # Enables Clearing Of The Depth Buffer
    glDepthFunc(GL_LESS)        # The Type Of Depth Test To Do
    glEnable(GL_DEPTH_TEST)        # Enables Depth Testing
    glShadeModel(GL_SMOOTH)        # Enables Smooth Color Shading
  
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()          # Reset The Projection Matrix
                    # Calculate The Aspect Ratio Of The Window
    gluPerspective(45.0, float(Width)/float(Height), 0.1, 100.0)

    glMatrixMode(GL_MODELVIEW)

# The function called when our window is resized (which shouldn't happen if you enable fullscreen, below)
def ReSizeGLScene(Width, Height):
    if Height == 0:            # Prevent A Divide By Zero If The Window Is Too Small 
      Height = 1

    glViewport(0, 0, Width, Height)    # Reset The Current Viewport And Perspective Transformation
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    gluPerspective(45.0, float(Width)/float(Height), 0.1, 100.0)
    glMatrixMode(GL_MODELVIEW)

# The main drawing function. 
def DrawGLScene():
  global xrot, yrot, zrot, texture

  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)  # Clear The Screen And The Depth Buffer
  glLoadIdentity()          # Reset The View
  glTranslatef(0.0,0.0,-5.0)      # Move Into The Screen

  glRotatef(xrot,1.0,0.0,0.0)      # Rotate The Cube On It's X Axis
  glRotatef(yrot,0.0,1.0,0.0)      # Rotate The Cube On It's Y Axis
  glRotatef(zrot,0.0,0.0,1.0)      # Rotate The Cube On It's Z Axis
    
    # Note there does not seem to be support for this call.
  #glBindTexture(GL_TEXTURE_2D,texture)  # Rotate The Pyramid On It's Y Axis

  glBegin(GL_QUADS)          # Start Drawing The Cube
  
  # Front Face (note that the texture's corners have to match the quad's corners)
  glTexCoord2f(0.0, 0.0); glVertex3f(-1.0, -1.0,  1.0)  # Bottom Left Of The Texture and Quad
  glTexCoord2f(1.0, 0.0); glVertex3f( 1.0, -1.0,  1.0)  # Bottom Right Of The Texture and Quad
  glTexCoord2f(1.0, 1.0); glVertex3f( 1.0,  1.0,  1.0)  # Top Right Of The Texture and Quad
  glTexCoord2f(0.0, 1.0); glVertex3f(-1.0,  1.0,  1.0)  # Top Left Of The Texture and Quad
  
  # Back Face
  glTexCoord2f(1.0, 0.0); glVertex3f(-1.0, -1.0, -1.0)  # Bottom Right Of The Texture and Quad
  glTexCoord2f(1.0, 1.0); glVertex3f(-1.0,  1.0, -1.0)  # Top Right Of The Texture and Quad
  glTexCoord2f(0.0, 1.0); glVertex3f( 1.0,  1.0, -1.0)  # Top Left Of The Texture and Quad
  glTexCoord2f(0.0, 0.0); glVertex3f( 1.0, -1.0, -1.0)  # Bottom Left Of The Texture and Quad
  
  # Top Face
  glTexCoord2f(0.0, 1.0); glVertex3f(-1.0,  1.0, -1.0)  # Top Left Of The Texture and Quad
  glTexCoord2f(0.0, 0.0); glVertex3f(-1.0,  1.0,  1.0)  # Bottom Left Of The Texture and Quad
  glTexCoord2f(1.0, 0.0); glVertex3f( 1.0,  1.0,  1.0)  # Bottom Right Of The Texture and Quad
  glTexCoord2f(1.0, 1.0); glVertex3f( 1.0,  1.0, -1.0)  # Top Right Of The Texture and Quad
  
  # Bottom Face       
  glTexCoord2f(1.0, 1.0); glVertex3f(-1.0, -1.0, -1.0)  # Top Right Of The Texture and Quad
  glTexCoord2f(0.0, 1.0); glVertex3f( 1.0, -1.0, -1.0)  # Top Left Of The Texture and Quad
  glTexCoord2f(0.0, 0.0); glVertex3f( 1.0, -1.0,  1.0)  # Bottom Left Of The Texture and Quad
  glTexCoord2f(1.0, 0.0); glVertex3f(-1.0, -1.0,  1.0)  # Bottom Right Of The Texture and Quad
  
  # Right face
  glTexCoord2f(1.0, 0.0); glVertex3f( 1.0, -1.0, -1.0)  # Bottom Right Of The Texture and Quad
  glTexCoord2f(1.0, 1.0); glVertex3f( 1.0,  1.0, -1.0)  # Top Right Of The Texture and Quad
  glTexCoord2f(0.0, 1.0); glVertex3f( 1.0,  1.0,  1.0)  # Top Left Of The Texture and Quad
  glTexCoord2f(0.0, 0.0); glVertex3f( 1.0, -1.0,  1.0)  # Bottom Left Of The Texture and Quad
  
  # Left Face
  glTexCoord2f(0.0, 0.0); glVertex3f(-1.0, -1.0, -1.0)  # Bottom Left Of The Texture and Quad
  glTexCoord2f(1.0, 0.0); glVertex3f(-1.0, -1.0,  1.0)  # Bottom Right Of The Texture and Quad
  glTexCoord2f(1.0, 1.0); glVertex3f(-1.0,  1.0,  1.0)  # Top Right Of The Texture and Quad
  glTexCoord2f(0.0, 1.0); glVertex3f(-1.0,  1.0, -1.0)  # Top Left Of The Texture and Quad
  
  glEnd();        # Done Drawing The Cube
    
  xrot  = xrot + 0.2                # X rotation
  yrot = yrot + 0.2                 # Y rotation
  zrot = zrot + 0.2                 # Z rotation

  #  since this is double buffered, swap the buffers to display what just got drawn. 
  glutSwapBuffers()

# The function called whenever a key is pressed. Note the use of Python tuples to pass in: (key, x, y)  
def keyPressed(*args):
  # If escape is pressed, kill everything.
    if args[0] == ESCAPE:
      sys.exit()

def main():
  global window
  glutInit(sys.argv)

  # Select type of Display mode:   
  #  Double buffer 
  #  RGBA color
  # Alpha components supported 
  # Depth buffer
  glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
  
  # get a 640 x 480 window 
  glutInitWindowSize(640, 480)
  
  # the window starts at the upper left corner of the screen 
  glutInitWindowPosition(0, 0)
  
  # Okay, like the C version we retain the window id to use when closing, but for those of you new
  # to Python (like myself), remember this assignment would make the variable local and not global
  # if it weren't for the global declaration at the start of main.
  window = glutCreateWindow("Jeff Molofee's GL Code Tutorial ... NeHe '99")

     # Register the drawing function with glut, BUT in Python land, at least using PyOpenGL, we need to
  # set the function pointer and invoke a function to actually register the callback, otherwise it
  # would be very much like the C version of the code.  
  glutDisplayFunc(DrawGLScene)
  
  # Uncomment this line to get full screen.
  # glutFullScreen()

  # When we are doing nothing, redraw the scene.
  glutIdleFunc(DrawGLScene)
  
  # Register the function called when our window is resized.
  glutReshapeFunc(ReSizeGLScene)
  
  # Register the function called when the keyboard is pressed.  
  glutKeyboardFunc(keyPressed)

  # Initialize our window. 
  InitGL(640, 480)

  # Start Event Processing Engine  
  glutMainLoop()

# Print message to console, and kick off the main to get it rolling.
print "Hit ESC key to quit."
main()
      
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