118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file depthBiasAttrib.h
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* @author rdb
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* @date 2021-08-24
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*/
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#ifndef DEPTHBIASATTRIB_H
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#define DEPTHBIASATTRIB_H
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#include "pandabase.h"
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#include "renderAttrib.h"
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#include "luse.h"
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class FactoryParams;
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/**
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* This is a special kind of attribute that instructs the graphics driver to
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* apply an offset or bias to the generated depth values for rendered
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* polygons, before they are written to the depth buffer.
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*
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* This class replaces the old DepthOffsetAttrib, which had a more limited
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* parameterization. The differences are:
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* - The sign of the factor parameter was inverted.
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* - The slope and constant factors are specified separately.
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* - The factors are specified as floating-point instead of integer.
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* - There is a new clamp parameter.
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*
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* Nested DepthBiasAttrib values accumulate; that is, a DepthBiasAttrib
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* with a value of 1 beneath another DepthBiasAttrib with a value of 2
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* presents a net offset of 3. (A DepthBiasAttrib will not, however,
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* combine with any other DepthBiasAttribs with a lower override parameter.)
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*
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* @since 1.11.0
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*/
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class EXPCL_PANDA_PGRAPH DepthBiasAttrib : public RenderAttrib {
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private:
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INLINE DepthBiasAttrib(PN_stdfloat slope_factor, PN_stdfloat constant_factor,
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PN_stdfloat clamp = 0);
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PUBLISHED:
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static CPT(RenderAttrib) make(PN_stdfloat slope_factor, PN_stdfloat constant_factor,
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PN_stdfloat clamp = 0);
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static CPT(RenderAttrib) make_default();
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public:
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INLINE PN_stdfloat get_slope_factor() const;
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INLINE PN_stdfloat get_constant_factor() const;
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INLINE PN_stdfloat get_clamp() const;
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PUBLISHED:
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MAKE_PROPERTY(slope_factor, get_slope_factor);
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MAKE_PROPERTY(constant_factor, get_constant_factor);
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MAKE_PROPERTY(clamp, get_clamp);
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public:
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virtual void output(std::ostream &out) const;
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protected:
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virtual int compare_to_impl(const RenderAttrib *other) const;
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virtual size_t get_hash_impl() const;
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virtual CPT(RenderAttrib) compose_impl(const RenderAttrib *other) const;
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virtual CPT(RenderAttrib) invert_compose_impl(const RenderAttrib *other) const;
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private:
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PN_stdfloat _slope_factor;
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PN_stdfloat _constant_factor;
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PN_stdfloat _clamp;
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PUBLISHED:
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static int get_class_slot() {
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return _attrib_slot;
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}
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virtual int get_slot() const {
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return get_class_slot();
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}
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MAKE_PROPERTY(class_slot, get_class_slot);
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public:
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static void register_with_read_factory();
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virtual void write_datagram(BamWriter *manager, Datagram &dg);
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protected:
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static TypedWritable *make_from_bam(const FactoryParams ¶ms);
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void fillin(DatagramIterator &scan, BamReader *manager);
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public:
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static TypeHandle get_class_type() {
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return _type_handle;
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}
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static void init_type() {
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RenderAttrib::init_type();
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register_type(_type_handle, "DepthBiasAttrib",
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RenderAttrib::get_class_type());
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_attrib_slot = register_slot(_type_handle, 100,
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new DepthBiasAttrib(0, 0, 0));
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}
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virtual TypeHandle get_type() const {
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return get_class_type();
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}
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virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
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private:
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static TypeHandle _type_handle;
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static int _attrib_slot;
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};
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#include "depthBiasAttrib.I"
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#endif
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