249 lines
9.2 KiB
C++
249 lines
9.2 KiB
C++
// 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) 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 "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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#include "config_pgraph.h"
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TypeHandle RescaleNormalAttrib::_type_handle;
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int RescaleNormalAttrib::_attrib_slot;
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CPT(RenderAttrib) RescaleNormalAttrib::_attribs[RescaleNormalAttrib::M_auto + 1];
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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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if (_attribs[mode].is_null()) {
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// Don't bother with return_new, since this is the only way a
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// RescaleNormalAttrib can be made anyway.
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_attribs[mode] = new RescaleNormalAttrib(mode);
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}
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return _attribs[mode];
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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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// 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 = (const RescaleNormalAttrib *)other;
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return (int)_mode - (int)ta->_mode;
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}
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////////////////////////////////////////////////////////////////////
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// Function: RescaleNormalAttrib::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 RescaleNormalAttrib::
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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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return hash;
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}
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////////////////////////////////////////////////////////////////////
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// Function: RescaleNormalAttrib::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) RescaleNormalAttrib::
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get_auto_shader_attrib_impl(const RenderState *state) const {
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// We currently only support M_normalize in the ShaderGenerator.
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if (_mode == M_none || _mode == M_normalize) {
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return this;
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} else {
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return RescaleNormalAttrib::make(M_normalize);
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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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// 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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dg.add_int8(_mode);
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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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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: 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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_mode = (Mode)scan.get_int8();
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}
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////////////////////////////////////////////////////////////////////
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// Function: RescaleNormalAttrib::init_type
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// Access: Public, Static
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// Description:
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////////////////////////////////////////////////////////////////////
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void RescaleNormalAttrib::
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init_type() {
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RenderAttrib::init_type();
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register_type(_type_handle, "RescaleNormalAttrib",
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RenderAttrib::get_class_type());
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// This is defined here, since we have otherwise no guarantee that
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// the config var has already been constructed by the time we call
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// init_type() at static init time.
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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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Mode mode = rescale_normals;
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RescaleNormalAttrib *attrib = new RescaleNormalAttrib(mode);
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_attrib_slot = register_slot(_type_handle, 100, attrib);
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_attribs[mode] = attrib;
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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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case RescaleNormalAttrib::M_rescale:
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return out << "rescale";
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case RescaleNormalAttrib::M_normalize:
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return out << "normalize";
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case RescaleNormalAttrib::M_auto:
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return out << "auto";
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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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// 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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if (cmp_nocase(word, "none") == 0) {
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mode = RescaleNormalAttrib::M_none;
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} else if (cmp_nocase(word, "rescale") == 0) {
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mode = RescaleNormalAttrib::M_rescale;
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} else if (cmp_nocase(word, "normalize") == 0) {
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mode = RescaleNormalAttrib::M_normalize;
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} else if (cmp_nocase(word, "auto") == 0) {
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mode = RescaleNormalAttrib::M_auto;
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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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return in;
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}
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