Panda3D
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vertexBufferContext.h
00001 // Filename: vertexBufferContext.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 VERTEXBUFFERCONTEXT_H
00016 #define VERTEXBUFFERCONTEXT_H
00017 
00018 #include "pandabase.h"
00019 
00020 #include "bufferContext.h"
00021 #include "geomVertexArrayData.h"
00022 #include "preparedGraphicsObjects.h"
00023 #include "adaptiveLru.h"
00024 
00025 ////////////////////////////////////////////////////////////////////
00026 //       Class : VertexBufferContext
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 VertexBufferContext : public BufferContext, public AdaptiveLruPage {
00037 public:
00038   INLINE VertexBufferContext(PreparedGraphicsObjects *pgo,
00039                              GeomVertexArrayData *data);
00040 
00041 PUBLISHED:
00042   INLINE GeomVertexArrayData *get_data() const;
00043 
00044   INLINE bool changed_size(const GeomVertexArrayDataHandle *reader) const;
00045   INLINE bool changed_usage_hint(const GeomVertexArrayDataHandle *reader) const;
00046   INLINE bool was_modified(const GeomVertexArrayDataHandle *reader) const;
00047 
00048 public:
00049   INLINE void update_data_size_bytes(size_t new_data_size_bytes);
00050   INLINE void mark_loaded(const GeomVertexArrayDataHandle *reader);
00051   INLINE void mark_unloaded();
00052 
00053   virtual void output(ostream &out) const;
00054   virtual void write(ostream &out, int indent_level) const;
00055 
00056 private:
00057   // This cannot be a PT(GeomVertexArrayData), because the data and
00058   // the GSG both own their VertexBufferContexts!  That would create a
00059   // circular reference count.
00060   GeomVertexArrayData *_data;
00061   GeomEnums::UsageHint _usage_hint;
00062 
00063 public:
00064   static TypeHandle get_class_type() {
00065     return _type_handle;
00066   }
00067   static void init_type() {
00068     BufferContext::init_type();
00069     register_type(_type_handle, "VertexBufferContext",
00070                   BufferContext::get_class_type());
00071   }
00072   virtual TypeHandle get_type() const {
00073     return get_class_type();
00074   }
00075   virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
00076 
00077 private:
00078   static TypeHandle _type_handle;
00079 
00080   friend class PreparedGraphicsObjects;
00081 };
00082 
00083 inline ostream &operator << (ostream &out, const VertexBufferContext &context) {
00084   context.output(out);
00085   return out;
00086 }
00087 
00088 #include "vertexBufferContext.I"
00089 
00090 #endif
00091 
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