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scissorAttrib.h
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file scissorAttrib.h
10 * @author drose
11 * @date 2008-07-29
12 */
13
14#ifndef SCISSORATTRIB_H
15#define SCISSORATTRIB_H
16
17#include "pandabase.h"
18
19#include "renderAttrib.h"
20#include "luse.h"
21
22 class FactoryParams;
23
24/**
25 * This restricts rendering to within a rectangular region of the scene,
26 * without otherwise affecting the viewport or lens properties. Geometry that
27 * falls outside the scissor region is not rendered. It is akin to the OpenGL
28 * glScissor() function.
29 *
30 * The ScissorAttrib always specifies its region relative to its enclosing
31 * DisplayRegion, in screen space, and performs no culling.
32 *
33 * See ScissorEffect if you wish to define a region relative to 2-D or 3-D
34 * coordinates in the scene graph, with culling.
35 */
36 class EXPCL_PANDA_PGRAPH ScissorAttrib : public RenderAttrib {
37 private:
38 ScissorAttrib(const LVecBase4 &frame);
39
40PUBLISHED:
41 static CPT(RenderAttrib) make_off();
42 INLINE static CPT(RenderAttrib) make(PN_stdfloat left, PN_stdfloat right, PN_stdfloat bottom, PN_stdfloat top);
43 static CPT(RenderAttrib) make(const LVecBase4 &frame);
44 static CPT(RenderAttrib) make_default();
45
46 INLINE bool is_off() const;
47
48 INLINE const LVecBase4 &get_frame() const;
49
50PUBLISHED:
51 MAKE_PROPERTY(frame, get_frame);
52
53 public:
54 virtual void output(std::ostream &out) const;
55
56 protected:
57 virtual int compare_to_impl(const RenderAttrib *other) const;
58 virtual size_t get_hash_impl() const;
59 virtual CPT(RenderAttrib) compose_impl(const RenderAttrib *other) const;
60
61 private:
62 LVecBase4 _frame;
63 bool _off;
64 static CPT(RenderAttrib) _off_attrib;
65
66PUBLISHED:
67 static int get_class_slot() {
68 return _attrib_slot;
69 }
70 virtual int get_slot() const {
71 return get_class_slot();
72 }
73 MAKE_PROPERTY(class_slot, get_class_slot);
74
75 public:
76 static void register_with_read_factory();
77 virtual void write_datagram(BamWriter *manager, Datagram &dg);
78
79 protected:
80 static TypedWritable *make_from_bam(const FactoryParams &params);
81 void fillin(DatagramIterator &scan, BamReader *manager);
82
83 public:
84 static TypeHandle get_class_type() {
85 return _type_handle;
86 }
87 static void init_type() {
88 RenderAttrib::init_type();
89 register_type(_type_handle, "ScissorAttrib",
90 RenderAttrib::get_class_type());
91
92 ScissorAttrib *attrib = new ScissorAttrib(LVecBase4(0, 1, 0, 1));
93 attrib->_off = true;
94 _attrib_slot = register_slot(_type_handle, 100, attrib);
95 }
96 virtual TypeHandle get_type() const {
97 return get_class_type();
98 }
99 virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
100
101 private:
102 static TypeHandle _type_handle;
103 static int _attrib_slot;
104};
105
106#include "scissorAttrib.I"
107
108#endif
FactoryParams
An instance of this class is passed to the Factory when requesting it to do its business and construc...
Definition factoryParams.h:36
RenderAttrib::write_datagram
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
Definition renderAttrib.cxx:527
RenderAttrib::register_slot
static int register_slot(TypeHandle type_handle, int sort, RenderAttrib *default_attrib)
Adds the indicated TypeHandle to the registry, if it is not there already, and returns a unique slot ...
Definition renderAttrib.I:101
ScissorAttrib::make_default
static ConstPointerTo< RenderAttrib > make_default()
Returns a RenderAttrib that corresponds to whatever the standard default properties for render attrib...
Definition scissorAttrib.cxx:75
ScissorAttrib::is_off
bool is_off() const
Returns true if the ScissorAttrib is an 'off' ScissorAttrib, indicating that scissor testing is disab...
Definition scissorAttrib.I:29
ScissorAttrib::make_off
static ConstPointerTo< RenderAttrib > make_off()
Constructs a new ScissorAttrib object that removes the scissor region and fills the DisplayRegion.
Definition scissorAttrib.cxx:49
ScissorAttrib::get_frame
get_frame
Returns the left, right, bottom, top coordinates of the scissor frame.
Definition scissorAttrib.h:51
luse.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
pandabase.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
register_type
void register_type(TypeHandle &type_handle, const std::string &name)
This inline function is just a convenient way to call TypeRegistry::register_type(),...
Definition register_type.I:22
renderAttrib.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
scissorAttrib.I
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.