284 lines
8.0 KiB
C++
284 lines
8.0 KiB
C++
// Filename: pointParticleRenderer.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 "pointParticleRenderer.h"
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#include "boundingSphere.h"
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#include "geomNode.h"
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////////////////////////////////////////////////////////////////////
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// Function : PointParticleRenderer
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// Access : Public
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// Description : special constructor
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////////////////////////////////////////////////////////////////////
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PointParticleRenderer::
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PointParticleRenderer(ParticleRendererAlphaMode am,
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float point_size,
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PointParticleBlendType bt,
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ParticleRendererBlendMethod bm,
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const Colorf& sc, const Colorf& ec) :
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BaseParticleRenderer(am),
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_start_color(sc), _end_color(ec),
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_point_size(point_size),
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_blend_type(bt), _blend_method(bm)
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{
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_point_primitive = new GeomPoint;
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init_geoms();
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}
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////////////////////////////////////////////////////////////////////
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// Function : PointParticleRenderer
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// Access : Public
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// Description : Copy constructor
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////////////////////////////////////////////////////////////////////
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PointParticleRenderer::
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PointParticleRenderer(const PointParticleRenderer& copy) :
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BaseParticleRenderer(copy),
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_max_pool_size(0)
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{
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_blend_type = copy._blend_type;
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_blend_method = copy._blend_method;
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_start_color = copy._start_color;
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_end_color = copy._end_color;
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_point_primitive = new GeomPoint;
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init_geoms();
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}
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////////////////////////////////////////////////////////////////////
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// Function : ~PointParticleRenderer
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// Access : Public
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// Description : Simple destructor
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////////////////////////////////////////////////////////////////////
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PointParticleRenderer::
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~PointParticleRenderer(void) {
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}
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////////////////////////////////////////////////////////////////////
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// Function : make_copy
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// Access : Public
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// Description : for spawning systems from dead particles
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////////////////////////////////////////////////////////////////////
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BaseParticleRenderer *PointParticleRenderer::
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make_copy(void) {
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return new PointParticleRenderer(*this);
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}
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////////////////////////////////////////////////////////////////////
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// Function : resize_pool
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// Access : Public
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// Description : reallocate the space for the vertex and color
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// pools
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////////////////////////////////////////////////////////////////////
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void PointParticleRenderer::
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resize_pool(int new_size) {
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if (new_size == _max_pool_size)
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return;
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_max_pool_size = new_size;
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_vertex_array = PTA_Vertexf::empty_array(new_size);
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_color_array = PTA_Colorf::empty_array(new_size);
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_point_primitive->set_coords(_vertex_array);
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_point_primitive->set_colors(_color_array, G_PER_VERTEX);
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init_geoms();
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}
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////////////////////////////////////////////////////////////////////
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// Function : init_geoms
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// Access : Private
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// Description : On-construction initialization
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////////////////////////////////////////////////////////////////////
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void PointParticleRenderer::
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init_geoms(void) {
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_point_primitive->set_num_prims(0);
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_point_primitive->set_size(_point_size);
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GeomNode *render_node = get_render_node();
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render_node->remove_all_geoms();
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render_node->add_geom(_point_primitive, _render_state);
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}
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////////////////////////////////////////////////////////////////////
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// Function : birth_particle
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// Access : Private, virtual
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// Description : child birth
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////////////////////////////////////////////////////////////////////
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void PointParticleRenderer::
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birth_particle(int) {
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}
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////////////////////////////////////////////////////////////////////
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// Function : kill_particle
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// Access : Private, virtual
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// Description : child kill
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////////////////////////////////////////////////////////////////////
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void PointParticleRenderer::
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kill_particle(int) {
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}
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////////////////////////////////////////////////////////////////////
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// Function : create_color
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// Access : Private
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// Description : Generates the point color based on the render_type
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////////////////////////////////////////////////////////////////////
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Colorf PointParticleRenderer::
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create_color(const BaseParticle *p) {
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Colorf color;
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float life_t, vel_t;
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float parameterized_age = 1.0f;
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bool have_alpha_t = false;
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switch (_blend_type) {
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//// Constant solid color
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case PP_ONE_COLOR:
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color = _start_color;
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break;
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//// Blending colors based on life
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case PP_BLEND_LIFE:
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parameterized_age = p->get_parameterized_age();
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life_t = parameterized_age;
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have_alpha_t = true;
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if (_blend_method == PP_BLEND_CUBIC)
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life_t = CUBIC_T(life_t);
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color = LERP(life_t, _start_color, _end_color);
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break;
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//// Blending colors based on vel
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case PP_BLEND_VEL:
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vel_t = p->get_parameterized_vel();
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if (_blend_method == PP_BLEND_CUBIC)
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vel_t = CUBIC_T(vel_t);
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color = LERP(vel_t, _start_color, _end_color);
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break;
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}
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// handle alpha channel
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if(_alpha_mode != PR_ALPHA_NONE) {
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if(_alpha_mode == PR_ALPHA_USER) {
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parameterized_age = 1.0;
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} else {
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if(!have_alpha_t)
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parameterized_age = p->get_parameterized_age();
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if(_alpha_mode==PR_ALPHA_OUT) {
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parameterized_age = 1.0f - parameterized_age;
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}
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}
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color[3] = parameterized_age * get_user_alpha();
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}
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return color;
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}
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////////////////////////////////////////////////////////////////////
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// Function : render
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// Access : Public
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// Description : renders the particle system out to a GeomNode
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////////////////////////////////////////////////////////////////////
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void PointParticleRenderer::
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render(pvector< PT(PhysicsObject) >& po_vector, int ttl_particles) {
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BaseParticle *cur_particle;
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int remaining_particles = ttl_particles;
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int i;
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Vertexf *cur_vert = &_vertex_array[0];
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Colorf *cur_color = &_color_array[0];
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// init the aabb
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_aabb_min.set(99999.0f, 99999.0f, 99999.0f);
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_aabb_max.set(-99999.0f, -99999.0f, -99999.0f);
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// run through every filled slot
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for (i = 0; i < (int)po_vector.size(); i++) {
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cur_particle = (BaseParticle *) po_vector[i].p();
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if (cur_particle->get_alive() == false)
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continue;
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// x aabb adjust
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if (cur_particle->get_position().get_x() > _aabb_max.get_x())
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_aabb_max[0] = cur_particle->get_position().get_x();
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else if (cur_particle->get_position().get_x() < _aabb_min.get_x())
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_aabb_min[0] = cur_particle->get_position().get_x();
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// y aabb adjust
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if (cur_particle->get_position().get_y() > _aabb_max.get_y())
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_aabb_max[1] = cur_particle->get_position().get_y();
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else if (cur_particle->get_position().get_y() < _aabb_min.get_y())
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_aabb_min[1] = cur_particle->get_position().get_y();
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// z aabb adjust
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if (cur_particle->get_position().get_z() > _aabb_max.get_z())
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_aabb_max[2] = cur_particle->get_position().get_z();
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else if (cur_particle->get_position().get_z() < _aabb_min.get_z())
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_aabb_min[2] = cur_particle->get_position().get_z();
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// stuff it into the arrays
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*cur_vert++ = cur_particle->get_position();
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*cur_color++ = create_color(cur_particle);
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// maybe jump out early?
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remaining_particles--;
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if (remaining_particles == 0)
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break;
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}
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_point_primitive->set_num_prims(ttl_particles);
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// done filling geompoint node, now do the bb stuff
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LPoint3f aabb_center = _aabb_min + ((_aabb_max - _aabb_min) * 0.5f);
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float radius = (aabb_center - _aabb_min).length();
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_point_primitive->set_bound(BoundingSphere(aabb_center, radius));
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get_render_node()->mark_bound_stale();
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}
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