Panda3D

txaFileFilter.h

00001 // Filename: txaFileFilter.h
00002 // Created by:  drose (27Jul06)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #ifndef TXAFILEFILTER_H
00016 #define TXAFILEFILTER_H
00017 
00018 #include "pandatoolbase.h"
00019 #include "texturePoolFilter.h"
00020 #include "pt_EggTexture.h"
00021 
00022 class TxaFile;
00023 
00024 ////////////////////////////////////////////////////////////////////
00025 //       Class : TxaFileFilter
00026 // Description : This is an abstract base class, a placeholder for any
00027 //               number of different classes that may wish to
00028 //               implement an effect on every texture loaded from disk
00029 //               via the TexturePool.
00030 //
00031 //               In practice, as of the time of this writing, only the
00032 //               TxaFileFilter (in pandatool) actually implements
00033 //               this.  But other kinds of filters are possible.
00034 //
00035 //               This filter, once registered, will get a callback and
00036 //               a chance to modify each texture as it is loaded from
00037 //               disk the first time.  If more than one filter is
00038 //               registered, each will be called in sequence, in the
00039 //               order in which they were registered.  
00040 //
00041 //               The filter does not get called again if the texture
00042 //               is subsequently reloaded from disk.  It is suggested
00043 //               that filters for which this might be a problem should
00044 //               call tex->set_keep_ram_image(true).
00045 ////////////////////////////////////////////////////////////////////
00046 class EXPCL_MISC TxaFileFilter : public TexturePoolFilter {
00047 public:
00048   virtual PT(Texture) post_load(Texture *tex);
00049 
00050 private:
00051   static void read_txa_file();
00052 
00053 private:
00054   static TxaFile *_txa_file;
00055   static bool _got_txa_file;
00056 
00057 public:
00058   static TypeHandle get_class_type() {
00059     return _type_handle;
00060   }
00061   static void init_type() {
00062     TexturePoolFilter::init_type();
00063     register_type(_type_handle, "TxaFileFilter",
00064                   TexturePoolFilter::get_class_type());
00065   }
00066   virtual TypeHandle get_type() const {
00067     return get_class_type();
00068   }
00069   virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
00070 
00071 private:
00072   static TypeHandle _type_handle;
00073 };
00074 
00075 #include "txaFileFilter.I"
00076 
00077 #endif
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