Fix Pyglet textures loading as greyscale in OS-X due to issues in the Quartz loader

fix_codecs.py

import sys

import pyglet

# on OS-X 10.7 (lion)
# the Quartz codec is buggered in Pyglet
if sys.platform == 'darwin':
    # clear the existing codecs
    pyglet.image.codecs._decoders = []
    pyglet.image.codecs._decoder_extensions = {}
    pyglet.image.codecs._decoder_animation_extensions = {}    
    pyglet.image.codecs._encoders = []
    pyglet.image.codecs._encoder_extensions = {}

    # just fallback to PIL
    try:
        import pyglet.image.codecs.pil
        pyglet.image.codecs.add_encoders(pyglet.image.codecs.pil)
        pyglet.image.codecs.add_decoders(pyglet.image.codecs.pil)
    except ImportError:
        pass

    # Compressed texture in DDS format
    try:
        from pyglet.image.codecs import dds
        pyglet.image.codecs.add_encoders(dds)
        pyglet.image.codecs.add_decoders(dds)
    except ImportError:
        pass

    # Fallback: PNG loader (slow)
    try:
        import pyglet.image.codecs.png
        pyglet.image.codecs.add_encoders(pyglet.image.codecs.png)
        pyglet.image.codecs.add_decoders(pyglet.image.codecs.png)
    except ImportError:
        pass

    # Fallback: BMP loader (slow)
    try:
        import pyglet.image.codecs.bmp
        pyglet.image.codecs.add_encoders(pyglet.image.codecs.bmp)
        pyglet.image.codecs.add_decoders(pyglet.image.codecs.bmp)
    except ImportError:
        pass