import Blender
from Blender import Draw, BGL

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

windowsize = Blender.Window.GetAreaSize()

# 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)

def event(evt, val):    # the function to handle input events
  global mystring, mymsg

  if not val:  # val = 0: it's a key/mbutton release
    if evt in [Draw.LEFTMOUSE, Draw.MIDDLEMOUSE, Draw.RIGHTMOUSE]:
      mymsg = "You released a mouse button."
      Draw.Redraw(1)
    return

  if evt == Draw.ESCKEY:
    Draw.Exit()                 # exit when user presses ESC
    return

  else: return # no need to redraw if nothing changed

  Draw.Redraw(1)

def button_event(evt):  # the function to handle Draw Button events
  	global mymsg, toggle
  	if evt == 1:
		pass

def gui():              # the function to draw the screen
	global xrot, yrot, zrot, texture
	glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
	LoadTextures()
	glEnable(GL_TEXTURE_2D)
	glClearColor(0.0, 0.0, 0.0, 0.0)
	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(windowsize[0])/float(windowsize[1]), 0.1, 100.0)
	glMatrixMode(GL_MODELVIEW)
	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,-6.0);
	
	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
	
	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 + 1.0                # X rotation
	yrot = yrot + 1.0                 # Y rotation
	zrot = zrot + 1.0                 # Z rotation	
	Blender.Draw.Redraw(1)
	
Draw.Register(gui, event, button_event)  # registering the 3 callbacks