167 lines
6.3 KiB
C++
167 lines
6.3 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) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#include "alphaTestAttrib.h"
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#include "attribSlots.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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////////////////////////////////////////////////////////////////////
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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, float 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::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;
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DCAST_INTO_R(ta, other, 0);
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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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} else {
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return (int) (255.0f*(_reference_alpha - ta->_reference_alpha));
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: AlphaTestAttrib::make_default_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 specify what the default property for a
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// AlphaTestAttrib of this type should be.
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//
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// This should return a newly-allocated AlphaTestAttrib of
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// the same type that corresponds to whatever the
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// standard default for this kind of AlphaTestAttrib is.
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////////////////////////////////////////////////////////////////////
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RenderAttrib *AlphaTestAttrib::
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make_default_impl() const {
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return new AlphaTestAttrib;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AlphaTestAttrib::store_into_slot
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// Access: Public, Virtual
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// Description: Stores this attrib into the appropriate slot of
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// an object of class AttribSlots.
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////////////////////////////////////////////////////////////////////
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void AlphaTestAttrib::
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store_into_slot(AttribSlots *slots) const {
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slots->_alpha_test = 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_float32(_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_float32();
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}
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