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+// Filename: rescaleNormalAttrib.cxx
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+// Created by: drose (30Dec04)
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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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+// [email protected] .
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+//
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+////////////////////////////////////////////////////////////////////
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+
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+#include "rescaleNormalAttrib.h"
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+#include "graphicsStateGuardianBase.h"
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+#include "string_utils.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 "configVariableEnum.h"
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+
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+TypeHandle RescaleNormalAttrib::_type_handle;
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+
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+// This variable is defined here instead of in config_pgraph.cxx,
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+// because it depends on rescaleNormalAttrib.h having already been
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+// included.
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+static ConfigVariableEnum<RescaleNormalAttrib::Mode> rescale_normals
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+("rescale-normals", RescaleNormalAttrib::M_auto,
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+ PRC_DESC("Specifies the kind of RescaleNormalAttrib that should be "
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+ "created for the top of the scene graph. This can automatically "
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+ "ensure that your lighting normals are unit-length, which may be "
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+ "particularly necessary in the presence of scales in the scene "
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+ "graph. Turning it off ('none') may produce a small performance "
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+ "benefit."));
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: RescaleNormalAttrib::make
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+// Access: Published, Static
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+// Description: Constructs a new RescaleNormalAttrib object that
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+// specifies whether to rescale normals to compensate
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+// for transform scales or incorrectly defined normals.
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+////////////////////////////////////////////////////////////////////
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+CPT(RenderAttrib) RescaleNormalAttrib::
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+make(RescaleNormalAttrib::Mode mode) {
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+ RescaleNormalAttrib *attrib = new RescaleNormalAttrib(mode);
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+ return return_new(attrib);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: RescaleNormalAttrib::make_default
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+// Access: Published, Static
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+// Description: Constructs a RescaleNoramlAttrib object that's
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+// suitable for putting at the top of a scene graph.
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+// This will contain whatever attrib was suggested by
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+// the user's rescale-normals Config variable.
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+////////////////////////////////////////////////////////////////////
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+CPT(RenderAttrib) RescaleNormalAttrib::
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+make_default() {
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+ RescaleNormalAttrib *attrib = new RescaleNormalAttrib(rescale_normals);
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+ return return_new(attrib);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: RescaleNormalAttrib::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 RescaleNormalAttrib::
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+issue(GraphicsStateGuardianBase *gsg) const {
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+ gsg->issue_rescale_normal(this);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: RescaleNormalAttrib::output
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+// Access: Public, Virtual
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+// Description:
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+////////////////////////////////////////////////////////////////////
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+void RescaleNormalAttrib::
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+output(ostream &out) const {
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+ out << get_type() << ":" << get_mode();
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: RescaleNormalAttrib::compare_to_impl
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+// Access: Protected, Virtual
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+// Description: Intended to be overridden by derived RescaleNormalAttrib
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+// types to return a unique number indicating whether
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+// this RescaleNormalAttrib is equivalent to the other one.
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+//
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+// This should return 0 if the two RescaleNormalAttrib 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 RescaleNormalAttrib
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+// objects whose get_type() functions return the same.
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+////////////////////////////////////////////////////////////////////
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+int RescaleNormalAttrib::
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+compare_to_impl(const RenderAttrib *other) const {
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+ const RescaleNormalAttrib *ta;
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+ DCAST_INTO_R(ta, other, 0);
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+ return (int)_mode - (int)ta->_mode;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: RescaleNormalAttrib::make_default_impl
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+// Access: Protected, Virtual
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+// Description: Intended to be overridden by derived RescaleNormalAttrib
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+// types to specify what the default property for a
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+// RescaleNormalAttrib of this type should be.
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+//
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+// This should return a newly-allocated RescaleNormalAttrib of
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+// the same type that corresponds to whatever the
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+// standard default for this kind of RescaleNormalAttrib is.
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+////////////////////////////////////////////////////////////////////
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+RenderAttrib *RescaleNormalAttrib::
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+make_default_impl() const {
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+ return new RescaleNormalAttrib(M_none);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: RescaleNormalAttrib::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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+// RescaleNormalAttrib.
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+////////////////////////////////////////////////////////////////////
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+void RescaleNormalAttrib::
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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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+// Function: RescaleNormalAttrib::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 RescaleNormalAttrib::
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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_int8(_mode);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: RescaleNormalAttrib::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 RescaleNormalAttrib is encountered
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+// in the Bam file. It should create the RescaleNormalAttrib
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+// and extract its information from the file.
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+////////////////////////////////////////////////////////////////////
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+TypedWritable *RescaleNormalAttrib::
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+make_from_bam(const FactoryParams ¶ms) {
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+ RescaleNormalAttrib *attrib = new RescaleNormalAttrib(M_none);
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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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+// Function: RescaleNormalAttrib::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 RescaleNormalAttrib.
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+////////////////////////////////////////////////////////////////////
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+void RescaleNormalAttrib::
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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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+ _mode = (Mode)scan.get_int8();
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: RescaleNormalAttrib::Mode output operator
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+// Description:
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+////////////////////////////////////////////////////////////////////
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+ostream &
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+operator << (ostream &out, RescaleNormalAttrib::Mode mode) {
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+ switch (mode) {
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+ case RescaleNormalAttrib::M_none:
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+ return out << "none";
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+
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+ case RescaleNormalAttrib::M_rescale:
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+ return out << "rescale";
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+
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+ case RescaleNormalAttrib::M_normalize:
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+ return out << "normalize";
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+
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+ case RescaleNormalAttrib::M_auto:
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+ return out << "auto";
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+ }
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+
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+ return out << "(**invalid RescaleNormalAttrib::Mode(" << (int)mode << ")**)";
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: RescaleNormalAttrib::Mode input operator
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+// Description:
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+////////////////////////////////////////////////////////////////////
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+istream &
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+operator >> (istream &in, RescaleNormalAttrib::Mode &mode) {
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+ string word;
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+ in >> word;
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+
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+ if (cmp_nocase(word, "none") == 0) {
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+ mode = RescaleNormalAttrib::M_none;
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+
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+ } else if (cmp_nocase(word, "rescale") == 0) {
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+ mode = RescaleNormalAttrib::M_rescale;
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+
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+ } else if (cmp_nocase(word, "normalize") == 0) {
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+ mode = RescaleNormalAttrib::M_normalize;
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+
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+ } else if (cmp_nocase(word, "auto") == 0) {
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+ mode = RescaleNormalAttrib::M_auto;
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+
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+ } else {
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+ pgraph_cat.error()
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+ << "Invalid RescaleNormalAttrib::Mode value: " << word << "\n";
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+ mode = RescaleNormalAttrib::M_none;
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+ }
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+
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+ return in;
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+}
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David Rose