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+// Filename: drawMaskAttrib.cxx
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+// Created by: drose (28Sep05)
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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 "drawMaskAttrib.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 "cullTraverser.h"
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+#include "config_pgraph.h"
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+
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+TypeHandle DrawMaskAttrib::_type_handle;
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: DrawMaskAttrib::make
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+// Access: Published, Static
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+// Description: Constructs a new DrawMaskAttrib that changes the
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+// bits_to_change bits in the current DrawMask to the
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+// values of the corresponding bits in new_mask. Only
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+// those bits in common with bits_to_change are
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+// affected.
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+////////////////////////////////////////////////////////////////////
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+CPT(RenderAttrib) DrawMaskAttrib::
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+make(DrawMask new_mask, DrawMask bits_to_change) {
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+ DrawMaskAttrib *attrib = new DrawMaskAttrib(new_mask, bits_to_change);
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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: DrawMaskAttrib::output
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+// Access: Public, Virtual
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+// Description:
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+////////////////////////////////////////////////////////////////////
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+void DrawMaskAttrib::
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+output(ostream &out) const {
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+ out << get_type() << ":" << get_new_mask() << "/" << get_bits_to_change();
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: DrawMaskAttrib::compare_to_impl
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+// Access: Protected, Virtual
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+// Description: Intended to be overridden by derived DrawMaskAttrib
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+// types to return a unique number indicating whether
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+// this DrawMaskAttrib is equivalent to the other one.
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+//
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+// This should return 0 if the two DrawMaskAttrib 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 DrawMaskAttrib
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+// objects whose get_type() functions return the same.
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+////////////////////////////////////////////////////////////////////
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+int DrawMaskAttrib::
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+compare_to_impl(const RenderAttrib *other) const {
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+ const DrawMaskAttrib *ta;
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+ DCAST_INTO_R(ta, other, 0);
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+
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+ int compare = get_new_mask().compare_to(ta->get_new_mask());
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+ if (compare != 0) {
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+ return compare;
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+ }
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+ compare = get_bits_to_change().compare_to(ta->get_bits_to_change());
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+ return compare;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: DrawMaskAttrib::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) DrawMaskAttrib::
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+compose_impl(const RenderAttrib *other) const {
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+ const DrawMaskAttrib *ta;
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+ DCAST_INTO_R(ta, other, 0);
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+
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+ DrawMask mask = get_new_mask();
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+ mask = (mask & ~ta->get_bits_to_change()) | ta->get_new_mask();
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+
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+ DrawMaskAttrib *attrib = new DrawMaskAttrib(mask, DrawMask::all_on());
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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: DrawMaskAttrib::make_default_impl
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+// Access: Protected, Virtual
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+// Description: Intended to be overridden by derived DrawMaskAttrib
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+// types to specify what the default property for a
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+// DrawMaskAttrib of this type should be.
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+//
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+// This should return a newly-allocated DrawMaskAttrib of
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+// the same type that corresponds to whatever the
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+// standard default for this kind of DrawMaskAttrib is.
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+////////////////////////////////////////////////////////////////////
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+RenderAttrib *DrawMaskAttrib::
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+make_default_impl() const {
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+ return new DrawMaskAttrib(DrawMask::all_on(), DrawMask::all_on());
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: DrawMaskAttrib::store_into_slot
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+// Access: Public, Virtual
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+// Description: Stores this attrib into the appropriate slot of
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+// an object of class AttribSlots.
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+////////////////////////////////////////////////////////////////////
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+void DrawMaskAttrib::
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+store_into_slot(AttribSlots *) const {
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+ // There's no need to store a DrawMaskAttrib at the moment, since it
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+ // doesn't actually change any rendering state.
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: DrawMaskAttrib::has_cull_callback
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+// Access: Public, Virtual
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+// Description: Should be overridden by derived classes to return
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+// true if cull_callback() has been defined. Otherwise,
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+// returns false to indicate cull_callback() does not
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+// need to be called for this node during the cull
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+// traversal.
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+////////////////////////////////////////////////////////////////////
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+bool DrawMaskAttrib::
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+has_cull_callback() const {
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+ return (_new_mask != DrawMask::all_on());
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: DrawMaskAttrib::cull_callback
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+// Access: Public, Virtual
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+// Description: If has_cull_callback() returns true, this function
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+// will be called during the cull traversal to perform
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+// any additional operations that should be performed at
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+// cull time.
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+//
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+// This is called each time the RenderAttrib is
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+// discovered applied to a Geom in the traversal. It
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+// should return true if the Geom is visible, false if
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+// it should be omitted.
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+////////////////////////////////////////////////////////////////////
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+bool DrawMaskAttrib::
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+cull_callback(CullTraverser *trav, const CullTraverserData &) const {
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+ return (trav->get_camera_mask() & _new_mask) != 0;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: DrawMaskAttrib::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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+// DrawMaskAttrib.
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+////////////////////////////////////////////////////////////////////
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+void DrawMaskAttrib::
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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: DrawMaskAttrib::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 DrawMaskAttrib::
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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_uint32(_new_mask.get_word());
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+ dg.add_uint32(_bits_to_change.get_word());
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: DrawMaskAttrib::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 DrawMaskAttrib is encountered
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+// in the Bam file. It should create the DrawMaskAttrib
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+// and extract its information from the file.
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+////////////////////////////////////////////////////////////////////
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+TypedWritable *DrawMaskAttrib::
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+make_from_bam(const FactoryParams ¶ms) {
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+ DrawMaskAttrib *attrib = new DrawMaskAttrib(0, 0);
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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: DrawMaskAttrib::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 DrawMaskAttrib.
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+////////////////////////////////////////////////////////////////////
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+void DrawMaskAttrib::
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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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+ _new_mask.set_word(scan.get_uint32());
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+ _bits_to_change.set_word(scan.get_uint32());
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+}
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David Rose