207 lines
8.3 KiB
C++
207 lines
8.3 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) 2001, 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://www.panda3d.org/license.txt .
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//
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// To contact the maintainers of this program write to
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// panda3d@yahoogroups.com .
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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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////////////////////////////////////////////////////////////////////
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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);
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: DepthOffsetAttrib::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 DepthOffsetAttrib::
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issue(GraphicsStateGuardianBase *gsg) const {
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gsg->issue_depth_offset(this);
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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() << ")";
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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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return _offset - ta->_offset;
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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);
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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);
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: DepthOffsetAttrib::make_default_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 specify what the default property for a
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// DepthOffsetAttrib of this type should be.
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//
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// This should return a newly-allocated DepthOffsetAttrib of
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// the same type that corresponds to whatever the
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// standard default for this kind of DepthOffsetAttrib is.
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////////////////////////////////////////////////////////////////////
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RenderAttrib *DepthOffsetAttrib::
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make_default_impl() const {
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return new DepthOffsetAttrib(0);
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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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}
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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);
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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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}
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