320 lines
12 KiB
C++
320 lines
12 KiB
C++
// Filename: cullFaceAttrib.cxx
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// Created by: drose (27Feb02)
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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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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#include "cullFaceAttrib.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 CullFaceAttrib::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::make
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// Access: Published, Static
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// Description: Constructs a new CullFaceAttrib object that specifies
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// how to cull geometry. By Panda convention, vertices
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// are ordered counterclockwise when seen from the
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// front, so the M_cull_clockwise will cull backfacing
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// polygons.
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//
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// M_cull_unchanged is an identity attrib; if this is
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// applied to vertices without any other intervening
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// attrib, it is the same as applying the default
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// attrib.
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) CullFaceAttrib::
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make(CullFaceAttrib::Mode mode) {
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CullFaceAttrib *attrib = new CullFaceAttrib(mode, false);
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::make_reverse
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// Access: Published, Static
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// Description: Constructs a new CullFaceAttrib object that reverses
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// the effects of any other CullFaceAttrib objects in
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// the scene graph. M_cull_clockwise will be treated as
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// M_cull_counter_clockwise, and vice-versa.
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// M_cull_none is unchanged.
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////////////////////////////////////////////////////////////////////
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CPT(RenderAttrib) CullFaceAttrib::
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make_reverse() {
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CullFaceAttrib *attrib = new CullFaceAttrib(M_cull_unchanged, true);
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::get_effective_mode
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// Access: Published
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// Description: Returns the effective culling mode. This is the same
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// as the actual culling mode, unless the reverse flag
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// is set, which swaps CW for CCW and vice-versa. Also,
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// M_cull_unchanged is mapped to M_cull_none.
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////////////////////////////////////////////////////////////////////
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CullFaceAttrib::Mode CullFaceAttrib::
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get_effective_mode() const {
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if (_reverse) {
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switch (_mode) {
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case M_cull_clockwise:
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case M_cull_unchanged:
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return M_cull_counter_clockwise;
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case M_cull_counter_clockwise:
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return M_cull_clockwise;
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default:
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break;
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}
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} else {
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switch (_mode) {
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case M_cull_clockwise:
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case M_cull_unchanged:
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return M_cull_clockwise;
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case M_cull_counter_clockwise:
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return M_cull_counter_clockwise;
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default:
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break;
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}
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}
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return M_cull_none;
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::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 CullFaceAttrib::
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issue(GraphicsStateGuardianBase *gsg) const {
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gsg->issue_cull_face(this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::output
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void CullFaceAttrib::
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output(ostream &out) const {
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out << get_type() << ":";
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switch (get_actual_mode()) {
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case M_cull_none:
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out << "cull_none";
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break;
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case M_cull_clockwise:
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out << "cull_clockwise";
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break;
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case M_cull_counter_clockwise:
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out << "cull_counter_clockwise";
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break;
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case M_cull_unchanged:
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out << "cull_unchanged";
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break;
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}
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if (get_reverse()) {
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out << "(reverse)";
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::compare_to_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived CullFaceAttrib
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// types to return a unique number indicating whether
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// this CullFaceAttrib is equivalent to the other one.
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//
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// This should return 0 if the two CullFaceAttrib 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 CullFaceAttrib
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// objects whose get_type() functions return the same.
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////////////////////////////////////////////////////////////////////
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int CullFaceAttrib::
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compare_to_impl(const RenderAttrib *other) const {
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const CullFaceAttrib *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 (int)_reverse - (int)ta->_reverse;
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::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) CullFaceAttrib::
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compose_impl(const RenderAttrib *other) const {
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const CullFaceAttrib *ta;
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DCAST_INTO_R(ta, other, 0);
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if (!_reverse && ta->_mode != M_cull_unchanged) {
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// The normal case (there is nothing funny going on): the second
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// attrib completely replaces this attrib.
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return other;
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}
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// In the more complex case, the two attribs affect each other in
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// some way, and we must generate a new attrib from the result.
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Mode mode = _mode;
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if (ta->_mode != M_cull_unchanged) {
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mode = ta->_mode;
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}
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bool reverse = (_reverse && !ta->_reverse) || (!_reverse && ta->_reverse);
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CullFaceAttrib *attrib = new CullFaceAttrib(mode, reverse);
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::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) CullFaceAttrib::
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invert_compose_impl(const RenderAttrib *other) const {
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const CullFaceAttrib *ta;
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DCAST_INTO_R(ta, other, 0);
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// The invert case is the same as the normal case, except that the
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// meaning of _reverse is inverted. See compose_impl(), above.
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if (_reverse && ta->_mode != M_cull_unchanged) {
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return other;
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}
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Mode mode = _mode;
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if (ta->_mode != M_cull_unchanged) {
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mode = ta->_mode;
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}
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bool reverse = (!_reverse && !ta->_reverse) || (_reverse && ta->_reverse);
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CullFaceAttrib *attrib = new CullFaceAttrib(mode, reverse);
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return return_new(attrib);
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::make_default_impl
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// Access: Protected, Virtual
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// Description: Intended to be overridden by derived CullFaceAttrib
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// types to specify what the default property for a
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// CullFaceAttrib of this type should be.
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//
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// This should return a newly-allocated CullFaceAttrib of
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// the same type that corresponds to whatever the
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// standard default for this kind of CullFaceAttrib is.
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////////////////////////////////////////////////////////////////////
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RenderAttrib *CullFaceAttrib::
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make_default_impl() const {
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return new CullFaceAttrib(M_cull_clockwise, false);
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::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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// CullFaceAttrib.
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////////////////////////////////////////////////////////////////////
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void CullFaceAttrib::
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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: CullFaceAttrib::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 CullFaceAttrib::
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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_int8(_mode);
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dg.add_bool(_reverse);
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullFaceAttrib::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 CullFaceAttrib is encountered
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// in the Bam file. It should create the CullFaceAttrib
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// and extract its information from the file.
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////////////////////////////////////////////////////////////////////
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TypedWritable *CullFaceAttrib::
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make_from_bam(const FactoryParams ¶ms) {
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CullFaceAttrib *attrib = new CullFaceAttrib(M_cull_none, false);
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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: CullFaceAttrib::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 CullFaceAttrib.
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////////////////////////////////////////////////////////////////////
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void CullFaceAttrib::
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fillin(DatagramIterator &scan, BamReader *manager) {
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RenderAttrib::fillin(scan, manager);
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_mode = (Mode)scan.get_int8();
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if (manager->get_file_minor_ver() >= 1) {
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_reverse = scan.get_bool();
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}
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}
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