Added code to properly figure out if the texture is transparent, and set the alpha channel for appropriate pixels.  The bitmap is then passed to OpenGL with alpha.
Added code to properly figure out if the texture is transparent, and
set the alpha channel for appropriate pixels.  The bitmap
is then passed to OpenGL with alpha.


git-svn-id: 28d9401aa571d5108e51b194aae6f24ca5964c06@530 8cc4aa7f-3514-0410-904f-f2cc9021211c

crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS