merge pixmap handling from sampler, material.h and ccdemos's image module to new Pixmap class
add check for PNG library, allow writing PNG file from a Pixmap
simplify demos using new methods from Sampler and Pixmap
Import('env lib')
myenv = env.Clone()
myenv.Append(CPPPATH = ['.','#include'], LIBPATH='#build/lib')
myenv.Prepend(LIBS=['pyrit'])
sdlenv = myenv.Clone()
sdlenv.ParseConfig('sh sdl-config --cflags --libs')
l = []
l.append( sdlenv.Program(['realtime.cc']) )
l.append( sdlenv.Program(['realtime_bunny.cc']) )
l.append( sdlenv.Program(['realtime_dragon.cc']) )
l.append( sdlenv.Program(['spheres_shadow.cc']) )
l.append( sdlenv.Program(['textures.cc']) )
myenv.Alias('cc-demos', l)