242 lines
9.7 KiB
C++
242 lines
9.7 KiB
C++
// Filename: depthOffsetAttrib.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) 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 "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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// Function: DepthOffsetAttrib::make
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// Access: Published, Static
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// Description: Constructs a new DepthOffsetAttrib object that
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// indicates the relative amount of bias to write to the
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// 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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// Function: DepthOffsetAttrib::make
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// Access: Published, Static
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// Description: Constructs a new DepthOffsetAttrib object that
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// indicates the bias, and also specifies a minimum and
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// maximum (or, more precisely, nearest and farthest)
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// values to write to the depth buffer, in the range 0
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// .. 1. This range is 0, 1 by default; setting it to
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// some other range can be used to create additional
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// 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, NULL);
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nassertr(max_value >= 0.0f && max_value <= 1.0f, NULL);
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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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// Function: DepthOffsetAttrib::make_default
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// Access: Published, Static
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// Description: Returns a RenderAttrib that corresponds to whatever
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// the standard default properties for render attributes
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// 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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// Function: DepthOffsetAttrib::output
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void DepthOffsetAttrib::
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output(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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// Function: DepthOffsetAttrib::compare_to_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived DepthOffsetAttrib
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// types to return a unique number indicating whether
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// this DepthOffsetAttrib is equivalent to the other one.
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//
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// This should return 0 if the two DepthOffsetAttrib 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 DepthOffsetAttrib
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// objects whose 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;
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DCAST_INTO_R(ta, other, 0);
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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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// Function: DepthOffsetAttrib::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 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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// Function: DepthOffsetAttrib::compose_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 specify how two consecutive RenderAttrib
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// objects of the same type interact.
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//
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// This should return the result of applying the other
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// RenderAttrib to a node in the scene graph below this
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// RenderAttrib, which was already applied. In most
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// cases, the result is the same as the other
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// RenderAttrib (that is, a subsequent RenderAttrib
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// completely replaces the preceding one). On the other
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// hand, some kinds of RenderAttrib (for instance,
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// ColorTransformAttrib) might combine in meaningful
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// 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;
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DCAST_INTO_R(ta, other, 0);
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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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// Function: DepthOffsetAttrib::invert_compose_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 specify how two consecutive RenderAttrib
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// 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;
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DCAST_INTO_R(ta, other, 0);
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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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// Function: DepthOffsetAttrib::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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// 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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// Function: DepthOffsetAttrib::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 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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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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// Function: DepthOffsetAttrib::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 DepthOffsetAttrib is encountered
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// in the Bam file. It should create the DepthOffsetAttrib
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// 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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// Function: DepthOffsetAttrib::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 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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