Panda3D

scissorAttrib.h

00001 // Filename: scissorAttrib.h
00002 // Created by:  drose (29Jul08)
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 SCISSORATTRIB_H
00016 #define SCISSORATTRIB_H
00017 
00018 #include "pandabase.h"
00019 
00020 #include "renderAttrib.h"
00021 #include "luse.h"
00022 
00023 class FactoryParams;
00024 
00025 ////////////////////////////////////////////////////////////////////
00026 //       Class : ScissorAttrib
00027 // Description : This restricts rendering to within a rectangular
00028 //               region of the scene, without otherwise affecting the
00029 //               viewport or lens properties.  Geometry that falls
00030 //               outside the scissor region is not rendered.  It is
00031 //               akin to the OpenGL glScissor() function.
00032 //
00033 //               The ScissorAttrib always specifies its region
00034 //               relative to its enclosing DisplayRegion, in screen
00035 //               space, and performs no culling.
00036 //
00037 //               See ScissorEffect if you wish to define a
00038 //               region relative to 2-D or 3-D coordinates in the
00039 //               scene graph, with culling.
00040 ////////////////////////////////////////////////////////////////////
00041 class EXPCL_PANDA_PGRAPH ScissorAttrib : public RenderAttrib {
00042 private:
00043   ScissorAttrib(const LVecBase4f &frame);
00044 
00045 PUBLISHED:
00046   static CPT(RenderAttrib) make_off();
00047   INLINE static CPT(RenderAttrib) make(float left, float right, float bottom, float top);
00048   static CPT(RenderAttrib) make(const LVecBase4f &frame);
00049   static CPT(RenderAttrib) make_default();
00050 
00051   INLINE const LVecBase4f &get_frame() const;
00052 
00053 public:
00054   virtual void output(ostream &out) const;
00055 
00056 protected:
00057   virtual int compare_to_impl(const RenderAttrib *other) const;
00058   virtual CPT(RenderAttrib) compose_impl(const RenderAttrib *other) const;
00059 
00060 private:
00061   LVecBase4f _frame;
00062   static CPT(RenderAttrib) _off;
00063 
00064 PUBLISHED:
00065   static int get_class_slot() {
00066     return _attrib_slot;
00067   }
00068   virtual int get_slot() const {
00069     return get_class_slot();
00070   }
00071 
00072 public:
00073   static void register_with_read_factory();
00074   virtual void write_datagram(BamWriter *manager, Datagram &dg);
00075 
00076 protected:
00077   static TypedWritable *make_from_bam(const FactoryParams &params);
00078   void fillin(DatagramIterator &scan, BamReader *manager);
00079   
00080 public:
00081   static TypeHandle get_class_type() {
00082     return _type_handle;
00083   }
00084   static void init_type() {
00085     RenderAttrib::init_type();
00086     register_type(_type_handle, "ScissorAttrib",
00087                   RenderAttrib::get_class_type());
00088     _attrib_slot = register_slot(_type_handle, 100, make_default);
00089   }
00090   virtual TypeHandle get_type() const {
00091     return get_class_type();
00092   }
00093   virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
00094 
00095 private:
00096   static TypeHandle _type_handle;
00097   static int _attrib_slot;
00098 };
00099 
00100 #include "scissorAttrib.I"
00101 
00102 #endif
00103 
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