204 lines
6.4 KiB
C++
204 lines
6.4 KiB
C++
/**
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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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* @file depthOffsetAttrib.cxx
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* @author drose
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* @date 2002-03-14
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*/
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#include "depthOffsetAttrib.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 DepthOffsetAttrib::_type_handle;
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int DepthOffsetAttrib::_attrib_slot;
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/**
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* Constructs a new DepthOffsetAttrib object that indicates the relative
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* amount of bias to write to the depth buffer for subsequent geometry.
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*/
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CPT(RenderAttrib) DepthOffsetAttrib::
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make(int offset) {
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DepthOffsetAttrib *attrib = new DepthOffsetAttrib(offset, 0.0f, 1.0f);
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return return_new(attrib);
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}
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/**
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* Constructs a new DepthOffsetAttrib object that indicates the bias, and also
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* specifies a minimum and maximum (or, more precisely, nearest and farthest)
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* values to write to the depth buffer, in the range 0 .. 1. This range is 0,
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* 1 by default; setting it to some other range can be used to create
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* additional depth buffer effects.
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*/
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CPT(RenderAttrib) DepthOffsetAttrib::
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make(int offset, PN_stdfloat min_value, PN_stdfloat max_value) {
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nassertr(min_value >= 0.0f && min_value <= 1.0f, nullptr);
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nassertr(max_value >= 0.0f && max_value <= 1.0f, nullptr);
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DepthOffsetAttrib *attrib = new DepthOffsetAttrib(offset, min_value, max_value);
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return return_new(attrib);
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}
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/**
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* Returns a RenderAttrib that corresponds to whatever the standard default
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* properties for render attributes of this type ought to be.
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*/
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CPT(RenderAttrib) DepthOffsetAttrib::
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make_default() {
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return return_new(new DepthOffsetAttrib(0, 0.0f, 1.0f));
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}
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/**
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*
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*/
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void DepthOffsetAttrib::
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output(std::ostream &out) const {
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out << get_type() << ":(" << get_offset() << ", " << get_min_value()
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<< ", " << get_max_value() << ")";
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}
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/**
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* Intended to be overridden by derived DepthOffsetAttrib types to return a
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* unique number indicating whether this DepthOffsetAttrib is equivalent to
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* the other one.
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*
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* This should return 0 if the two DepthOffsetAttrib objects are equivalent, a
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* number less than zero if this one should be sorted before the other one,
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* and a number greater than zero otherwise.
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*
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* This will only be called with two DepthOffsetAttrib objects whose
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* get_type() functions return the same.
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*/
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int DepthOffsetAttrib::
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compare_to_impl(const RenderAttrib *other) const {
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const DepthOffsetAttrib *ta = (const DepthOffsetAttrib *)other;
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if (_offset != ta->_offset) {
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return _offset - ta->_offset;
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}
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if (_min_value != ta->_min_value) {
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return _min_value < ta->_min_value ? -1 : 1;
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}
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if (_max_value != ta->_max_value) {
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return _max_value < ta->_max_value ? -1 : 1;
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}
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return 0;
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}
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/**
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* Intended to be overridden by derived RenderAttrib types to return a unique
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* hash for these particular properties. RenderAttribs that compare the same
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* with compare_to_impl(), above, should return the same hash; RenderAttribs
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* that compare differently should return a different hash.
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*/
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size_t DepthOffsetAttrib::
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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, _offset);
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hash = float_hash().add_hash(hash, _min_value);
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hash = float_hash().add_hash(hash, _max_value);
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return hash;
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}
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/**
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* Intended to be overridden by derived RenderAttrib types to specify how two
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* consecutive RenderAttrib objects of the same type interact.
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*
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* This should return the result of applying the other RenderAttrib to a node
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* in the scene graph below this RenderAttrib, which was already applied. In
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* most cases, the result is the same as the other RenderAttrib (that is, a
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* subsequent RenderAttrib completely replaces the preceding one). On the
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* other hand, some kinds of RenderAttrib (for instance, ColorTransformAttrib)
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* might combine in meaningful ways.
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*/
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CPT(RenderAttrib) DepthOffsetAttrib::
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compose_impl(const RenderAttrib *other) const {
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const DepthOffsetAttrib *ta = (const DepthOffsetAttrib *)other;
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int new_offset = ta->_offset + _offset;
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DepthOffsetAttrib *attrib = new DepthOffsetAttrib(new_offset, ta->_min_value, ta->_max_value);
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return return_new(attrib);
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}
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/**
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* Intended to be overridden by derived RenderAttrib types to specify how two
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* consecutive RenderAttrib objects of the same type interact.
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*
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* See invert_compose() and compose_impl().
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*/
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CPT(RenderAttrib) DepthOffsetAttrib::
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invert_compose_impl(const RenderAttrib *other) const {
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const DepthOffsetAttrib *ta = (const DepthOffsetAttrib *)other;
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int new_offset = ta->_offset - _offset;
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DepthOffsetAttrib *attrib = new DepthOffsetAttrib(new_offset, ta->_min_value, ta->_max_value);
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return return_new(attrib);
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}
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/**
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* Tells the BamReader how to create objects of type DepthOffsetAttrib.
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*/
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void DepthOffsetAttrib::
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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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* Writes the contents of this object to the datagram for shipping out to a
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* Bam file.
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*/
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void DepthOffsetAttrib::
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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_int32(_offset);
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if (manager->get_file_minor_ver() >= 31) {
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dg.add_stdfloat(_min_value);
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dg.add_stdfloat(_max_value);
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}
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}
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/**
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* This function is called by the BamReader's factory when a new object of
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* type DepthOffsetAttrib is encountered in the Bam file. It should create
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* the DepthOffsetAttrib and extract its information from the file.
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*/
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TypedWritable *DepthOffsetAttrib::
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make_from_bam(const FactoryParams ¶ms) {
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DepthOffsetAttrib *attrib = new DepthOffsetAttrib(0, 0.0f, 1.0f);
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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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* This internal function is called by make_from_bam to read in all of the
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* relevant data from the BamFile for the new DepthOffsetAttrib.
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*/
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void DepthOffsetAttrib::
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fillin(DatagramIterator &scan, BamReader *manager) {
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RenderAttrib::fillin(scan, manager);
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_offset = scan.get_int32();
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_min_value = 0.0f;
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_max_value = 1.0f;
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if (manager->get_file_minor_ver() >= 31) {
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_min_value = scan.get_stdfloat();
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_max_value = scan.get_stdfloat();
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}
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}
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