204 lines
7.3 KiB
C++
204 lines
7.3 KiB
C++
// Filename: fogAttrib.cxx
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// Created by: drose (14Mar02)
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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 "fogAttrib.h"
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#include "graphicsStateGuardianBase.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 FogAttrib::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: FogAttrib::make
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// Access: Published, Static
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// Description: Constructs a new FogAttrib object suitable for
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// rendering the indicated fog onto geometry.
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) FogAttrib::
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make(Fog *fog) {
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FogAttrib *attrib = new FogAttrib;
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attrib->_fog = fog;
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: FogAttrib::make_off
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// Access: Published, Static
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// Description: Constructs a new FogAttrib object suitable for
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// rendering unfogd geometry.
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) FogAttrib::
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make_off() {
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FogAttrib *attrib = new FogAttrib;
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: FogAttrib::issue
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// Access: Public, Virtual
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// Description: Calls the appropriate method on the indicated GSG
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// to issue the graphics commands appropriate to the
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// given attribute. This is normally called
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// (indirectly) only from
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// GraphicsStateGuardian::set_state() or modify_state().
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////////////////////////////////////////////////////////////////////
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void FogAttrib::
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issue(GraphicsStateGuardianBase *gsg) const {
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gsg->issue_fog(this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: FogAttrib::output
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void FogAttrib::
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output(ostream &out) const {
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out << get_type() << ":";
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if (is_off()) {
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out << "(off)";
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} else {
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out << *_fog;
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: FogAttrib::compare_to_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived FogAttrib
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// types to return a unique number indicating whether
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// this FogAttrib is equivalent to the other one.
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//
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// This should return 0 if the two FogAttrib 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 FogAttrib
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// objects whose get_type() functions return the same.
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////////////////////////////////////////////////////////////////////
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int FogAttrib::
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compare_to_impl(const RenderAttrib *other) const {
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const FogAttrib *ta;
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DCAST_INTO_R(ta, other, 0);
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// Comparing pointers by subtraction is problematic. Instead of
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// doing this, we'll just depend on the built-in != and < operators
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// for comparing pointers.
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if (_fog != ta->_fog) {
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return _fog < ta->_fog ? -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: FogAttrib::make_default_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived FogAttrib
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// types to specify what the default property for a
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// FogAttrib of this type should be.
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//
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// This should return a newly-allocated FogAttrib of
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// the same type that corresponds to whatever the
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// standard default for this kind of FogAttrib is.
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////////////////////////////////////////////////////////////////////
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RenderAttrib *FogAttrib::
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make_default_impl() const {
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return new FogAttrib;
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}
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////////////////////////////////////////////////////////////////////
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// Function: FogAttrib::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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// FogAttrib.
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////////////////////////////////////////////////////////////////////
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void FogAttrib::
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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: FogAttrib::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 FogAttrib::
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write_datagram(BamWriter *manager, Datagram &dg) {
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RenderAttrib::write_datagram(manager, dg);
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manager->write_pointer(dg, _fog);
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}
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////////////////////////////////////////////////////////////////////
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// Function: FogAttrib::complete_pointers
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// Access: Public, Virtual
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// Description: Receives an array of pointers, one for each time
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// manager->read_pointer() was called in fillin().
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// Returns the number of pointers processed.
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////////////////////////////////////////////////////////////////////
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int FogAttrib::
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complete_pointers(TypedWritable **p_list, BamReader *manager) {
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int pi = RenderAttrib::complete_pointers(p_list, manager);
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TypedWritable *fog = p_list[pi++];
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if (fog != (TypedWritable *)NULL) {
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_fog = DCAST(Fog, fog);
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}
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return pi;
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}
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////////////////////////////////////////////////////////////////////
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// Function: FogAttrib::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 FogAttrib is encountered
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// in the Bam file. It should create the FogAttrib
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// and extract its information from the file.
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////////////////////////////////////////////////////////////////////
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TypedWritable *FogAttrib::
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make_from_bam(const FactoryParams ¶ms) {
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FogAttrib *attrib = new FogAttrib;
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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: FogAttrib::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 FogAttrib.
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////////////////////////////////////////////////////////////////////
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void FogAttrib::
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fillin(DatagramIterator &scan, BamReader *manager) {
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RenderAttrib::fillin(scan, manager);
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// Read the _fog pointer.
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manager->read_pointer(scan);
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}
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