102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
// Filename: baseParticleRenderer.cxx
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// Created by: charles (20Jun00)
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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 <pandabase.h>
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#include <nodeRelation.h>
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#include "baseParticleRenderer.h"
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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRenderer
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// Access : Public
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// Description : Default Constructor
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////////////////////////////////////////////////////////////////////
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BaseParticleRenderer::
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BaseParticleRenderer(ParticleRendererAlphaMode alpha_mode) :
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_alpha_arc((RenderRelation *) NULL),
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_alpha_mode(PR_NOT_INITIALIZED_YET) {
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_render_node = new GeomNode("BaseParticleRenderer render node");
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_user_alpha = 1.0f;
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update_alpha_mode(alpha_mode);
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}
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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRenderer
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// Access : Public
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// Description : Copy Constructor
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////////////////////////////////////////////////////////////////////
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BaseParticleRenderer::
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BaseParticleRenderer(const BaseParticleRenderer& copy) :
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_alpha_arc((RenderRelation *) NULL),
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_alpha_mode(PR_ALPHA_NONE) {
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_render_node = new GeomNode("BaseParticleRenderer render node");
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_user_alpha = copy._user_alpha;
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update_alpha_mode(copy._alpha_mode);
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}
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////////////////////////////////////////////////////////////////////
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// Function : ~BaseParticleRenderer
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// Access : Public
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// Description : Destructor
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////////////////////////////////////////////////////////////////////
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BaseParticleRenderer::
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~BaseParticleRenderer(void) {
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if(_alpha_mode != PR_ALPHA_NONE)
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remove_arc(_alpha_arc);
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}
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////////////////////////////////////////////////////////////////////
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// Function : enable_alpha
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// Access : Private
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// Description : Builds an intermediate node and transition that
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// enables alpha channeling.
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////////////////////////////////////////////////////////////////////
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void BaseParticleRenderer::
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enable_alpha(void) {
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_render_node->clear();
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_alpha_node = new GeomNode("BaseParticleRenderer alpha node");
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_alpha_arc = new RenderRelation(_render_node, _alpha_node);
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_alpha_arc->set_transition(new TransparencyTransition(TransparencyProperty::M_alpha));
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_interface_node = _alpha_node;
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}
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////////////////////////////////////////////////////////////////////
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// Function : update_alpha_state
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// Access : Private
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// Description : handles the base class part of alpha updating.
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////////////////////////////////////////////////////////////////////
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void BaseParticleRenderer::
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update_alpha_mode(ParticleRendererAlphaMode am) {
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if (_alpha_mode == am)
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return;
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if ((am == PR_ALPHA_NONE) && (_alpha_mode != PR_ALPHA_NONE))
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disable_alpha();
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else if ((am != PR_ALPHA_NONE) && (_alpha_mode == PR_ALPHA_NONE))
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enable_alpha();
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_alpha_mode = am;
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}
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