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+/**
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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.cxx
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+ * @author rdb
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+ * @date 2021-08-24
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+ */
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+
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+#include "depthBiasAttrib.h"
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+#include "graphicsStateGuardianBase.h"
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+#include "dcast.h"
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+#include "bamReader.h"
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+#include "bamWriter.h"
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+#include "datagram.h"
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+#include "datagramIterator.h"
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+
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+TypeHandle DepthBiasAttrib::_type_handle;
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+int DepthBiasAttrib::_attrib_slot;
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+
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+/**
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+ * Constructs a new DepthBiasAttrib object that indicates the slope factor,
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+ * constant factor, and an optional clamping value.
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+ */
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+CPT(RenderAttrib) DepthBiasAttrib::
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+make(PN_stdfloat slope_factor, PN_stdfloat constant_factor, PN_stdfloat clamp) {
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+ DepthBiasAttrib *attrib = new DepthBiasAttrib(slope_factor, constant_factor, clamp);
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+ return return_new(attrib);
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+}
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+
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+/**
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+ * Returns a RenderAttrib that corresponds to whatever the standard default
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+ * properties for render attributes of this type ought to be.
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+ */
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+CPT(RenderAttrib) DepthBiasAttrib::
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+make_default() {
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+ return return_new(new DepthBiasAttrib(0, 0, 0));
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+}
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+
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+/**
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+ *
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+ */
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+void DepthBiasAttrib::
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+output(std::ostream &out) const {
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+ out << get_type() << ":(" << get_slope_factor() << ", " << get_constant_factor()
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+ << ", " << get_clamp() << ")";
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+}
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+
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+/**
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+ * Intended to be overridden by derived DepthBiasAttrib types to return a
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+ * unique number indicating whether this DepthBiasAttrib is equivalent to
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+ * the other one.
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+ *
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+ * This should return 0 if the two DepthBiasAttrib objects are equivalent, a
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+ * number less than zero if this one should be sorted before the other one,
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+ * and a number greater than zero otherwise.
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+ *
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+ * This will only be called with two DepthBiasAttrib objects whose
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+ * get_type() functions return the same.
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+ */
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+int DepthBiasAttrib::
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+compare_to_impl(const RenderAttrib *other) const {
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+ const DepthBiasAttrib *ta = (const DepthBiasAttrib *)other;
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+
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+ if (_slope_factor != ta->_slope_factor) {
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+ return _slope_factor < ta->_slope_factor ? -1 : 1;
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+ }
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+ if (_constant_factor != ta->_constant_factor) {
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+ return _constant_factor < ta->_constant_factor ? -1 : 1;
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+ }
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+ if (_clamp != ta->_clamp) {
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+ return _clamp < ta->_clamp ? -1 : 1;
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+ }
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+ return 0;
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+}
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+
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+/**
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+ * Intended to be overridden by derived RenderAttrib types to return a unique
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+ * hash for these particular properties. RenderAttribs that compare the same
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+ * with compare_to_impl(), above, should return the same hash; RenderAttribs
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+ * that compare differently should return a different hash.
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+ */
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+size_t DepthBiasAttrib::
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+get_hash_impl() const {
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+ size_t hash = 0;
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+ hash = float_hash().add_hash(hash, _slope_factor);
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+ hash = float_hash().add_hash(hash, _constant_factor);
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+ hash = float_hash().add_hash(hash, _clamp);
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+ return hash;
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+}
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+
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+/**
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+ * Intended to be overridden by derived RenderAttrib types to specify how two
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+ * consecutive RenderAttrib objects of the same type interact.
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+ *
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+ * This should return the result of applying the other RenderAttrib to a node
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+ * in the scene graph below this RenderAttrib, which was already applied. In
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+ * most cases, the result is the same as the other RenderAttrib (that is, a
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+ * subsequent RenderAttrib completely replaces the preceding one). On the
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+ * other hand, some kinds of RenderAttrib (for instance, ColorTransformAttrib)
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+ * might combine in meaningful ways.
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+ */
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+CPT(RenderAttrib) DepthBiasAttrib::
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+compose_impl(const RenderAttrib *other) const {
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+ const DepthBiasAttrib *ba = (const DepthBiasAttrib *)other;
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+
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+ return return_new(new DepthBiasAttrib(ba->_slope_factor + _slope_factor,
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+ ba->_constant_factor + _constant_factor,
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+ ba->_clamp));
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+}
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+
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+/**
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+ * Intended to be overridden by derived RenderAttrib types to specify how two
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+ * consecutive RenderAttrib objects of the same type interact.
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+ *
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+ * See invert_compose() and compose_impl().
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+ */
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+CPT(RenderAttrib) DepthBiasAttrib::
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+invert_compose_impl(const RenderAttrib *other) const {
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+ const DepthBiasAttrib *ba = (const DepthBiasAttrib *)other;
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+
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+ return return_new(new DepthBiasAttrib(ba->_slope_factor - _slope_factor,
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+ ba->_constant_factor - _constant_factor,
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+ ba->_clamp));
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+}
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+
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+/**
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+ * Tells the BamReader how to create objects of type DepthBiasAttrib.
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+ */
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+void DepthBiasAttrib::
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+register_with_read_factory() {
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+ BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
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+}
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+
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+/**
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+ * Writes the contents of this object to the datagram for shipping out to a
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+ * Bam file.
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+ */
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+void DepthBiasAttrib::
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+write_datagram(BamWriter *manager, Datagram &dg) {
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+ RenderAttrib::write_datagram(manager, dg);
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+
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+ dg.add_stdfloat(_slope_factor);
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+ dg.add_stdfloat(_constant_factor);
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+ dg.add_stdfloat(_clamp);
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+}
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+
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+/**
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+ * This function is called by the BamReader's factory when a new object of
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+ * type DepthBiasAttrib is encountered in the Bam file. It should create
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+ * the DepthBiasAttrib and extract its information from the file.
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+ */
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+TypedWritable *DepthBiasAttrib::
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+make_from_bam(const FactoryParams ¶ms) {
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+ DepthBiasAttrib *attrib = new DepthBiasAttrib(0, 0, 0);
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+ DatagramIterator scan;
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+ BamReader *manager;
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+
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+ parse_params(params, scan, manager);
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+ attrib->fillin(scan, manager);
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+
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+ return attrib;
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+}
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+
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+/**
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+ * This internal function is called by make_from_bam to read in all of the
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+ * relevant data from the BamFile for the new DepthBiasAttrib.
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+ */
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+void DepthBiasAttrib::
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+fillin(DatagramIterator &scan, BamReader *manager) {
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+ RenderAttrib::fillin(scan, manager);
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+
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+ _slope_factor = scan.get_stdfloat();
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+ _constant_factor = scan.get_stdfloat();
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+ _clamp = scan.get_stdfloat();
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+}
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rdb