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+// Filename: antialiasAttrib.cxx
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+// Created by: drose (26Jan05)
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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 "antialiasAttrib.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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+
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+TypeHandle AntialiasAttrib::_type_handle;
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: AntialiasAttrib::make
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+// Access: Published, Static
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+// Description: Constructs a new AntialiasAttrib object.
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+//
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+// The mode should be either M_none, M_best, or a union
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+// of any or all of M_point, M_line, M_polygon, and
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+// M_multisample.
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+//
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+// If M_none is specified, no antialiasing is performed.
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+//
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+// If M_best is specified, M_multisample is selected if
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+// it is available, otherwise M_polygon is selected,
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+// unless drawing lines or points, in which case M_line
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+// or M_point is selected (these two generally produce
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+// better results than M_multisample)
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+//
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+// In the explicit form, it enables all of the specified
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+// multisample modes.
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+////////////////////////////////////////////////////////////////////
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+CPT(RenderAttrib) AntialiasAttrib::
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+make(unsigned short mode) {
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+ AntialiasAttrib *attrib = new AntialiasAttrib(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: AntialiasAttrib::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 AntialiasAttrib::
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+issue(GraphicsStateGuardianBase *gsg) const {
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+ gsg->issue_antialias(this);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: AntialiasAttrib::output
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+// Access: Public, Virtual
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+// Description:
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+////////////////////////////////////////////////////////////////////
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+void AntialiasAttrib::
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+output(ostream &out) const {
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+ out << get_type() << ":";
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+ if (_mode == M_none) {
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+ out << " none";
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+
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+ } else if (_mode == M_best) {
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+ out << " best";
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+
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+ } else {
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+ char sep = ' ';
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+ if ((_mode & M_point) != 0) {
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+ out << sep << "point";
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+ sep = '|';
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+ }
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+ if ((_mode & M_line) != 0) {
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+ out << sep << "line";
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+ sep = '|';
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+ }
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+ if ((_mode & M_polygon) != 0) {
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+ out << sep << "polygon";
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+ sep = '|';
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+ }
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+ if ((_mode & M_best) != 0) {
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+ out << sep << "best";
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+ sep = '|';
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+ }
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+ }
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: AntialiasAttrib::compare_to_impl
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+// Access: Protected, Virtual
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+// Description: Intended to be overridden by derived AntialiasAttrib
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+// types to return a unique number indicating whether
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+// this AntialiasAttrib is equivalent to the other one.
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+//
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+// This should return 0 if the two AntialiasAttrib 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 AntialiasAttrib
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+// objects whose get_type() functions return the same.
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+////////////////////////////////////////////////////////////////////
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+int AntialiasAttrib::
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+compare_to_impl(const RenderAttrib *other) const {
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+ const AntialiasAttrib *ta;
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+ DCAST_INTO_R(ta, other, 0);
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+ if (_mode != ta->_mode) {
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+ return (int)_mode - (int)ta->_mode;
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+ }
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+ return 0;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: AntialiasAttrib::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) AntialiasAttrib::
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+compose_impl(const RenderAttrib *other) const {
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+ const AntialiasAttrib *ta;
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+ DCAST_INTO_R(ta, other, 0);
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+ if (ta->get_mode() == M_none || ta->get_mode() == M_best ||
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+ get_mode() == M_none || get_mode() == M_best) {
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+ // These two special modes don't combine: if one of these modes is
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+ // involved, the lower attrib wins.
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+ return ta;
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+ }
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+
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+ // Otherwise, both attribs reflect an explicit setting. In that
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+ // case, these modes combine in the sensible way, as a union of
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+ // bits.
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+ return make(get_mode() | ta->get_mode());
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: AntialiasAttrib::make_default_impl
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+// Access: Protected, Virtual
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+// Description: Intended to be overridden by derived AntialiasAttrib
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+// types to specify what the default property for a
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+// AntialiasAttrib of this type should be.
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+//
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+// This should return a newly-allocated AntialiasAttrib of
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+// the same type that corresponds to whatever the
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+// standard default for this kind of AntialiasAttrib is.
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+////////////////////////////////////////////////////////////////////
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+RenderAttrib *AntialiasAttrib::
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+make_default_impl() const {
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+ return new AntialiasAttrib(M_none);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: AntialiasAttrib::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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+// AntialiasAttrib.
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+////////////////////////////////////////////////////////////////////
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+void AntialiasAttrib::
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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: AntialiasAttrib::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 AntialiasAttrib::
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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_uint16(_mode);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: AntialiasAttrib::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 AntialiasAttrib is encountered
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+// in the Bam file. It should create the AntialiasAttrib
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+// and extract its information from the file.
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+////////////////////////////////////////////////////////////////////
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+TypedWritable *AntialiasAttrib::
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+make_from_bam(const FactoryParams ¶ms) {
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+ AntialiasAttrib *attrib = new AntialiasAttrib(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: AntialiasAttrib::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 AntialiasAttrib.
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+////////////////////////////////////////////////////////////////////
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+void AntialiasAttrib::
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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 = scan.get_uint16();
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+}
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David Rose