180 lines
6.7 KiB
C++
180 lines
6.7 KiB
C++
// Filename: alphaTestAttrib.cxx
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// Created by: drose (04Mar02)
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//
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////////////////////////////////////////////////////////////////////
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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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////////////////////////////////////////////////////////////////////
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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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TypeHandle AlphaTestAttrib::_type_handle;
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int AlphaTestAttrib::_attrib_slot;
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////////////////////////////////////////////////////////////////////
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// Function: AlphaTestAttrib::make
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// Access: Published, Static
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// Description: 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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// Function: AlphaTestAttrib::make_default
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// Access: Published, Static
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// Description: Returns a RenderAttrib that corresponds to whatever
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// the standard default properties for render attributes
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// 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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// Function: AlphaTestAttrib::output
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void AlphaTestAttrib::
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output(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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// Function: AlphaTestAttrib::compare_to_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived AlphaTestAttrib
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// types to return a unique number indicating whether
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// this AlphaTestAttrib is equivalent to the other one.
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//
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// This should return 0 if the two AlphaTestAttrib objects
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// are equivalent, a number less than zero if this one
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// should be sorted before the other one, and a number
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// greater than zero otherwise.
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//
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// This will only be called with two AlphaTestAttrib
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// objects whose get_type() 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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// Function: AlphaTestAttrib::get_hash_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived RenderAttrib
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// types to return a unique hash for these particular
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// properties. RenderAttribs that compare the same with
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// compare_to_impl(), above, should return the same
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// hash; RenderAttribs that compare differently should
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// 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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// Function: AlphaTestAttrib::get_auto_shader_attrib_impl
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// Access: Protected, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) AlphaTestAttrib::
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get_auto_shader_attrib_impl(const RenderState *state) const {
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return this;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AlphaTestAttrib::register_with_read_factory
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// Access: Public, Static
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// Description: Tells the BamReader how to create objects of type
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// 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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// Function: AlphaTestAttrib::write_datagram
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// Access: Public, Virtual
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// Description: Writes the contents of this object to the datagram
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// for shipping out to a 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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// Function: AlphaTestAttrib::make_from_bam
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// Access: Protected, Static
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// Description: This function is called by the BamReader's factory
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// when a new object of type AlphaTestAttrib is encountered
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// in the Bam file. It should create the AlphaTestAttrib
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// 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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// Function: AlphaTestAttrib::fillin
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// Access: Protected
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// Description: This internal function is called by make_from_bam to
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// read in all of the relevant data from the BamFile for
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// 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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