Panda3D

indexBufferContext.h

00001 // Filename: indexBufferContext.h
00002 // Created by:  drose (17Mar05)
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 INDEXBUFFERCONTEXT_H
00016 #define INDEXBUFFERCONTEXT_H
00017 
00018 #include "pandabase.h"
00019 
00020 #include "bufferContext.h"
00021 #include "geomPrimitive.h"
00022 #include "preparedGraphicsObjects.h"
00023 #include "adaptiveLru.h"
00024 
00025 ////////////////////////////////////////////////////////////////////
00026 //       Class : IndexBufferContext
00027 // Description : This is a special class object that holds all the
00028 //               information returned by a particular GSG to indicate
00029 //               the vertex data array's internal context identifier.
00030 //
00031 //               This allows the GSG to cache the vertex data array in
00032 //               whatever way makes sense.  For instance, DirectX can
00033 //               allocate a vertex buffer for the array.  OpenGL can
00034 //               create a buffer object.
00035 ////////////////////////////////////////////////////////////////////
00036 class EXPCL_PANDA_GOBJ IndexBufferContext : public BufferContext, public AdaptiveLruPage {
00037 public:
00038   INLINE IndexBufferContext(PreparedGraphicsObjects *pgo, GeomPrimitive *data);
00039 
00040 PUBLISHED:
00041   INLINE GeomPrimitive *get_data() const;
00042 
00043   INLINE bool changed_size(const GeomPrimitivePipelineReader *reader) const;
00044   INLINE bool changed_usage_hint(const GeomPrimitivePipelineReader *reader) const;
00045   INLINE bool was_modified(const GeomPrimitivePipelineReader *reader) const;
00046 
00047 public:
00048   INLINE void update_data_size_bytes(size_t new_data_size_bytes);
00049   INLINE void mark_loaded(const GeomPrimitivePipelineReader *reader);
00050   INLINE void mark_unloaded();
00051 
00052   virtual void output(ostream &out) const;
00053   virtual void write(ostream &out, int indent_level) const;
00054 
00055 private:
00056   // This cannot be a PT(GeomPrimitive), because the data and
00057   // the GSG both own their IndexBufferContexts!  That would create a
00058   // circular reference count.
00059   GeomPrimitive *_data;
00060   GeomEnums::UsageHint _usage_hint;
00061 
00062 public:
00063   static TypeHandle get_class_type() {
00064     return _type_handle;
00065   }
00066   static void init_type() {
00067     BufferContext::init_type();
00068     register_type(_type_handle, "IndexBufferContext",
00069                   BufferContext::get_class_type());
00070   }
00071   virtual TypeHandle get_type() const {
00072     return get_class_type();
00073   }
00074   virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
00075 
00076 private:
00077   static TypeHandle _type_handle;
00078 
00079   friend class PreparedGraphicsObjects;
00080 };
00081 
00082 inline ostream &operator << (ostream &out, const IndexBufferContext &context) {
00083   context.output(out);
00084   return out;
00085 }
00086 
00087 #include "indexBufferContext.I"
00088 
00089 #endif
00090 
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