145 lines
4.0 KiB
C++
145 lines
4.0 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 alphaTestAttrib.cxx
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* @author drose
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* @date 2002-03-04
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*/
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#include "alphaTestAttrib.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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#include "auxBitplaneAttrib.h"
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TypeHandle AlphaTestAttrib::_type_handle;
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int AlphaTestAttrib::_attrib_slot;
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/**
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* Constructs a new AlphaTestAttrib object.
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*/
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CPT(RenderAttrib) AlphaTestAttrib::
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make(PandaCompareFunc mode, PN_stdfloat reference_value) {
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assert((reference_value >=0.0f) && (reference_value <=1.0f));
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AlphaTestAttrib *attrib = new AlphaTestAttrib(mode,reference_value);
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return return_new(attrib);
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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) AlphaTestAttrib::
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make_default() {
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return return_new(new AlphaTestAttrib);
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}
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/**
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*
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*/
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void AlphaTestAttrib::
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output(std::ostream &out) const {
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out << get_type() << ":";
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output_comparefunc(out,_mode);
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out << "," << _reference_alpha;
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}
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/**
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* Intended to be overridden by derived AlphaTestAttrib types to return a
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* unique number indicating whether this AlphaTestAttrib is equivalent to the
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* other one.
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*
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* This should return 0 if the two AlphaTestAttrib 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 AlphaTestAttrib objects whose get_type()
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* functions return the same.
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*/
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int AlphaTestAttrib::
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compare_to_impl(const RenderAttrib *other) const {
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const AlphaTestAttrib *ta = (const AlphaTestAttrib *)other;
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int compare_result = ((int)_mode - (int)ta->_mode) ;
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if (compare_result != 0) {
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return compare_result;
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}
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if (_reference_alpha != ta->_reference_alpha) {
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return _reference_alpha < ta->_reference_alpha ? -1 : 1;
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}
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return 0;
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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 AlphaTestAttrib::
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get_hash_impl() const {
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size_t hash = 0;
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hash = int_hash::add_hash(hash, (int)_mode);
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hash = float_hash().add_hash(hash, _reference_alpha);
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return hash;
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}
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/**
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* Tells the BamReader how to create objects of type AlphaTestAttrib.
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*/
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void AlphaTestAttrib::
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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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* 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 AlphaTestAttrib::
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write_datagram(BamWriter *manager, Datagram &dg) {
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RenderAttrib::write_datagram(manager, dg);
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dg.add_int8(_mode);
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dg.add_stdfloat(_reference_alpha);
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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 AlphaTestAttrib is encountered in the Bam file. It should create the
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* AlphaTestAttrib and extract its information from the file.
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*/
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TypedWritable *AlphaTestAttrib::
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make_from_bam(const FactoryParams ¶ms) {
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AlphaTestAttrib *attrib = new AlphaTestAttrib;
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DatagramIterator scan;
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BamReader *manager;
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parse_params(params, scan, manager);
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attrib->fillin(scan, manager);
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return attrib;
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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 AlphaTestAttrib.
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*/
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void AlphaTestAttrib::
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fillin(DatagramIterator &scan, BamReader *manager) {
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RenderAttrib::fillin(scan, manager);
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_mode = (PandaCompareFunc)scan.get_int8();
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_reference_alpha = scan.get_stdfloat();
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}
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