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Python Open Source » Development » PyObjC 
PyObjC » trunk » pyobjc » PyOpenGL 2.0.2.01 » OpenGL » Demo » NeHe » lesson18.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: 1.10 $')[1]
__date__ = string.join(string.split('$Date: 2003/05/04 05:56:48 $')[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_num = 2
object = 0
light = 0

def LoadTextures():
  global texture_num, textures
  image = open("Wall.bmp")
  
  ix = image.size[0]
  iy = image.size[1]
  image = image.tostring("raw", "RGBX", 0, -1)
  
  # Create Texture
  textures = glGenTextures(3)
  glBindTexture(GL_TEXTURE_2D, textures[0])   # 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)

  # Create Linear Filtered Texture 
  glBindTexture(GL_TEXTURE_2D, textures[1])
  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR)
  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR)
  glTexImage2D(GL_TEXTURE_2D, 0, 3, ix, iy, 0, GL_RGBA, GL_UNSIGNED_BYTE, image)

  # Create MipMapped Texture
  glBindTexture(GL_TEXTURE_2D, textures[2])
  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR)
  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST)
  gluBuild2DMipmaps(GL_TEXTURE_2D, 3, ix, iy, GL_RGBA, GL_UNSIGNED_BYTE, image)



# 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.
  global quadratic
  
  LoadTextures()

  quadratic = gluNewQuadric()
  gluQuadricNormals(quadratic, GLU_SMOOTH)    # Create Smooth Normals (NEW) 
  gluQuadricTexture(quadratic, GL_TRUE)      # Create Texture Coords (NEW) 
 
  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)

  glLightfv(GL_LIGHT0, GL_AMBIENT, (0.5, 0.5, 0.5, 1.0))    # Setup The Ambient Light 
  glLightfv(GL_LIGHT0, GL_DIFFUSE, (1.0, 1.0, 1.0, 1.0))    # Setup The Diffuse Light 
  glLightfv(GL_LIGHT0, GL_POSITION, (0.0, 0.0, 2.0, 1.0))  # Position The Light 
  glEnable(GL_LIGHT0)          # Enable Light One 



# 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)


def DrawCube():
  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


# The main drawing function. 
def DrawGLScene():
  global xrot, yrot, zrot, textures, texture_num, object, quadratic, light

  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
  
  glBindTexture(GL_TEXTURE_2D, textures[texture_num])

  if light:
    glEnable(GL_LIGHTING)
  else:
    glDisable(GL_LIGHTING)

  if object == 0:
    DrawCube()
  elif object == 1:
    glTranslatef(0.0,0.0,-1.5)      # Center The Cylinder 
    gluCylinder(quadratic,1.0,1.0,3.0,32,32)  # A Cylinder With A Radius Of 0.5 And A Height Of 2 
  elif object == 2:
    gluDisk(quadratic,0.5,1.5,32,32)
    # Draw A Disc (CD Shape) With An 
    # Inner Radius Of 0.5, And An 
    # Outer Radius Of 2.  Plus A Lot Of Segments  
  elif object == 3:
    gluSphere(quadratic,1.3,32,32) # Draw A Sphere With A Radius Of 1 And 16 Longitude And 16 Latitude Segments 
  elif object == 4:
    glTranslatef(0.0,0.0,-1.5)      # Center The Cone
    # A Cone With A Bottom Radius Of .5 And A Height Of 2 
    gluCylinder(quadratic,1.0,0.0,3.0,32,32)  
  elif object == 5:
    gluPartialDisk(quadratic,0.5,1.5,32,32,0,300)  # A Disk Like The One Before 
  elif object == 6:
    glutSolidTeapot(1.0)

  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
def keyPressed(key, x, y):
  global object, texture_num, light
  # If escape is pressed, kill everything.
  key = string.upper(key)
  if key == ESCAPE:
    sys.exit()
  elif key == 'L':
    light = not light
  elif key == 'T': #  switch the texture
    texture_num = (texture_num + 1) % 3
  elif key == 'O': #  switch the object
    object = (object + 1) % 7


def main():
  usage = """Press L to toggle Lighting
Press T to change textures
Press O to change objects"""
  print usage
  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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