158 lines
5.7 KiB
C++
158 lines
5.7 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) Carnegie Mellon University. All rights reserved.
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//
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// All use of this software is subject to the terms of the revised BSD
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// license. You should have received a copy of this license along
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// with this source code in a file named "LICENSE."
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//
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////////////////////////////////////////////////////////////////////
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#include "pandabase.h"
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#include "baseParticleRenderer.h"
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#include "transparencyAttrib.h"
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#include "colorAttrib.h"
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#include "compassEffect.h"
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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRender::BaseParticleRenderer
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// Access : Published
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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_mode(PR_NOT_INITIALIZED_YET) {
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_render_node = new GeomNode("BaseParticleRenderer render node");
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_render_node_path = NodePath(_render_node);
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_user_alpha = 1.0f;
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_ignore_scale = false;
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update_alpha_mode(alpha_mode);
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}
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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRender::BaseParticleRenderer
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// Access : Published
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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_mode(PR_ALPHA_NONE) {
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_render_node = new GeomNode("BaseParticleRenderer render node");
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_render_node_path = NodePath(_render_node);
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_user_alpha = copy._user_alpha;
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set_ignore_scale(copy._ignore_scale);
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update_alpha_mode(copy._alpha_mode);
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}
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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRender::~BaseParticleRenderer
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// Access : Published
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// Description : Destructor
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////////////////////////////////////////////////////////////////////
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BaseParticleRenderer::
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~BaseParticleRenderer() {
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}
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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRender::set_ignore_scale
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// Access : Published
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// Description : Sets the "ignore scale" flag. When this is true,
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// particles will be drawn as if they had no scale,
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// regardless of whatever scale might be inherited from
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// above the render node in the scene graph.
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//
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// This flag is mainly useful to support legacy code
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// that was written for a very early version of Panda,
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// whose sprite particle renderer had a bug that
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// incorrectly ignored the inherited scale.
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////////////////////////////////////////////////////////////////////
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void BaseParticleRenderer::
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set_ignore_scale(bool ignore_scale) {
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_ignore_scale = ignore_scale;
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if (_ignore_scale) {
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_render_node->set_effect(CompassEffect::make(NodePath(), CompassEffect::P_scale));
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} else {
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_render_node->clear_effect(CompassEffect::get_class_type());
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRender::output
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// Access : Published
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// Description : Write a string representation of this instance to
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// <out>.
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////////////////////////////////////////////////////////////////////
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void BaseParticleRenderer::
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output(ostream &out) const {
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#ifndef NDEBUG //[
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out<<"BaseParticleRenderer";
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#endif //] NDEBUG
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}
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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRender::write
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// Access : Published
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// Description : Write a string representation of this instance to
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// <out>.
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////////////////////////////////////////////////////////////////////
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void BaseParticleRenderer::
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write(ostream &out, int indent) const {
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#ifndef NDEBUG //[
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out.width(indent); out<<""; out<<"BaseParticleRenderer:\n";
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out.width(indent+2); out<<""; out<<"_render_node "<<_render_node_path<<"\n";
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out.width(indent+2); out<<""; out<<"_user_alpha "<<_user_alpha<<"\n";
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//ReferenceCount::write(out, indent+2);
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#endif //] NDEBUG
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}
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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRender::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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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRender::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() {
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_render_state = RenderState::make(TransparencyAttrib::make(TransparencyAttrib::M_alpha),
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ColorAttrib::make_vertex());
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}
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////////////////////////////////////////////////////////////////////
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// Function : BaseParticleRender::disable_alpha
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// Access : Private
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// Description : kills the intermediate alpha node/arc
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////////////////////////////////////////////////////////////////////
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void BaseParticleRenderer::
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disable_alpha() {
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_render_state = RenderState::make(TransparencyAttrib::make(TransparencyAttrib::M_none),
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ColorAttrib::make_vertex());
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}
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