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alphaTestAttrib.h
1 // Filename: alphaTestAttrib.h
2 // Created by: drose (04Mar02)
3 //
4 ////////////////////////////////////////////////////////////////////
5 //
6 // PANDA 3D SOFTWARE
7 // Copyright (c) Carnegie Mellon University. All rights reserved.
8 //
9 // All use of this software is subject to the terms of the revised BSD
10 // license. You should have received a copy of this license along
11 // with this source code in a file named "LICENSE."
12 //
13 ////////////////////////////////////////////////////////////////////
14 
15 #ifndef ALPHATESTATTRIB_H
16 #define ALPHATESTATTRIB_H
17 
18 #include "pandabase.h"
19 #include "renderAttrib.h"
20 
21 class FactoryParams;
22 
23 ////////////////////////////////////////////////////////////////////
24 // Class : AlphaTestAttrib
25 // Description : Enables or disables writing of pixel to framebuffer
26 // based on its alpha value relative to a reference alpha value
27 ////////////////////////////////////////////////////////////////////
28 class EXPCL_PANDA_PGRAPH AlphaTestAttrib : public RenderAttrib {
29 private:
30  INLINE AlphaTestAttrib(PandaCompareFunc mode = M_always,
31  PN_stdfloat reference_alpha = 1.0f);
32 
33 PUBLISHED:
34  static CPT(RenderAttrib) make(PandaCompareFunc mode,
35  PN_stdfloat reference_alpha);
36  static CPT(RenderAttrib) make_default();
37 
38  INLINE PN_stdfloat get_reference_alpha() const;
39  INLINE PandaCompareFunc get_mode() const;
40 
41 public:
42  virtual void output(ostream &out) const;
43 
44 protected:
45  virtual int compare_to_impl(const RenderAttrib *other) const;
46  virtual size_t get_hash_impl() const;
47  virtual CPT(RenderAttrib) get_auto_shader_attrib_impl(const RenderState *state) const;
48 
49 private:
50  PandaCompareFunc _mode;
51  PN_stdfloat _reference_alpha; // should be in range [0.0-1.0]
52 
53 PUBLISHED:
54  static int get_class_slot() {
55  return _attrib_slot;
56  }
57  virtual int get_slot() const {
58  return get_class_slot();
59  }
60 
61 public:
62  static void register_with_read_factory();
63  virtual void write_datagram(BamWriter *manager, Datagram &dg);
64 
65 protected:
66  static TypedWritable *make_from_bam(const FactoryParams &params);
67  void fillin(DatagramIterator &scan, BamReader *manager);
68 
69 public:
70  static TypeHandle get_class_type() {
71  return _type_handle;
72  }
73  static void init_type() {
74  RenderAttrib::init_type();
75  register_type(_type_handle, "AlphaTestAttrib",
76  RenderAttrib::get_class_type());
77  _attrib_slot = register_slot(_type_handle, 100, make_default);
78  }
79  virtual TypeHandle get_type() const {
80  return get_class_type();
81  }
82  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
83 
84 private:
85  static TypeHandle _type_handle;
86  static int _attrib_slot;
87 };
88 
89 #include "alphaTestAttrib.I"
90 
91 #endif
92 
static int register_slot(TypeHandle type_handle, int sort, RenderAttribRegistry::MakeDefaultFunc *make_default_func)
Adds the indicated TypeHandle to the registry, if it is not there already, and returns a unique slot ...
Definition: renderAttrib.I:163
This is the base class for a number of render attributes (other than transform) that may be set on sc...
Definition: renderAttrib.h:60
This is the fundamental interface for extracting binary objects from a Bam file, as generated by a Ba...
Definition: bamReader.h:122
Base class for objects that can be written to and read from Bam files.
Definition: typedWritable.h:37
This is the fundamental interface for writing binary objects to a Bam file, to be extracted later by ...
Definition: bamWriter.h:73
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
An instance of this class is passed to the Factory when requesting it to do its business and construc...
Definition: factoryParams.h:40
Enables or disables writing of pixel to framebuffer based on its alpha value relative to a reference ...
This represents a unique collection of RenderAttrib objects that correspond to a particular renderabl...
Definition: renderState.h:53
A class to retrieve the individual data elements previously stored in a Datagram. ...
TypeHandle is the identifier used to differentiate C++ class types.
Definition: typeHandle.h:85
An ordered list of data elements, formatted in memory for transmission over a socket or writing to a ...
Definition: datagram.h:43