283 lines
6.9 KiB
C++
283 lines
6.9 KiB
C++
/**
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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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* @file pointParticleRenderer.cxx
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* @author charles
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* @date 2000-06-20
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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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#include "geom.h"
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#include "geomVertexWriter.h"
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#include "indent.h"
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#include "pStatTimer.h"
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PStatCollector PointParticleRenderer::_render_collector("App:Particles:Point:Render");
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/**
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* special constructor
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*/
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PointParticleRenderer::
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PointParticleRenderer(ParticleRendererAlphaMode am,
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PN_stdfloat point_size,
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PointParticleBlendType bt,
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ParticleRendererBlendMethod bm,
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const LColor& sc, const LColor& ec) :
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BaseParticleRenderer(am),
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_start_color(sc), _end_color(ec),
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_blend_type(bt), _blend_method(bm)
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{
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set_point_size(point_size);
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resize_pool(0);
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}
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/**
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* 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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{
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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_size = copy._point_size;
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_thick = copy._thick;
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resize_pool(0);
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}
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/**
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* Simple destructor
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*/
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PointParticleRenderer::
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~PointParticleRenderer() {
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}
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/**
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* for spawning systems from dead particles
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*/
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BaseParticleRenderer *PointParticleRenderer::
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make_copy() {
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return new PointParticleRenderer(*this);
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}
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/**
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* reallocate the space for the vertex and color 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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init_geoms();
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}
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/**
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* On-construction initialization
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*/
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void PointParticleRenderer::
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init_geoms() {
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_vdata = new GeomVertexData
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("point_particles", GeomVertexFormat::get_v3cp(),
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Geom::UH_stream);
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PT(Geom) geom = new Geom(_vdata);
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_point_primitive = geom;
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_points = new GeomPoints(Geom::UH_stream);
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geom->add_primitive(_points);
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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->add_attrib(_thick));
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}
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/**
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* 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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* 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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* Generates the point color based on the render_type
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*/
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LColor PointParticleRenderer::
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create_color(const BaseParticle *p) {
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LColor color;
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PN_stdfloat life_t, vel_t;
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PN_stdfloat parameterized_age = 1.0f;
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bool have_alpha_t = false;
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switch (_blend_type) {
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case PP_ONE_COLOR:
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// Constant solid color
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color = _start_color;
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break;
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case PP_BLEND_LIFE:
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// Blending colors based on 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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}
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color = LERP(life_t, _start_color, _end_color);
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break;
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case PP_BLEND_VEL:
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// Blending colors based on 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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}
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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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}
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if (_alpha_mode == PR_ALPHA_OUT) {
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parameterized_age = 1.0f - parameterized_age;
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} else if (_alpha_mode == PR_ALPHA_IN_OUT) {
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parameterized_age = 2.0f * min(parameterized_age,
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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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* 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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PStatTimer t1(_render_collector);
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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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GeomVertexWriter vertex(_vdata, InternalName::get_vertex());
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GeomVertexWriter color(_vdata, InternalName::get_color());
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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())
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continue;
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LPoint3 position = cur_particle->get_position();
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// x aabb adjust
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if (position[0] > _aabb_max[0])
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_aabb_max[0] = position[0];
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else if (position[0] < _aabb_min[0])
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_aabb_min[0] = position[0];
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// y aabb adjust
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if (position[1] > _aabb_max[1])
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_aabb_max[1] = position[1];
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else if (position[1] < _aabb_min[1])
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_aabb_min[1] = position[1];
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// z aabb adjust
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if (position[2] > _aabb_max[2])
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_aabb_max[2] = position[2];
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else if (position[2] < _aabb_min[2])
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_aabb_min[2] = position[2];
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// stuff it into the arrays
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vertex.add_data3(position);
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color.add_data4(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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_points->clear_vertices();
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_points->add_next_vertices(ttl_particles);
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// done filling geompoint node, now do the bb stuff
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LPoint3 aabb_center = _aabb_min + ((_aabb_max - _aabb_min) * 0.5f);
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PN_stdfloat radius = (aabb_center - _aabb_min).length();
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BoundingSphere sphere(aabb_center, radius);
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_point_primitive->set_bounds(&sphere);
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get_render_node()->mark_internal_bounds_stale();
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}
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/**
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* Write a string representation of this instance to <out>.
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*/
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void PointParticleRenderer::
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output(ostream &out) const {
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#ifndef NDEBUG //[
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out<<"PointParticleRenderer";
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#endif //] NDEBUG
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}
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/**
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* Write a string representation of this instance to <out>.
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*/
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void PointParticleRenderer::
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write(ostream &out, int indent_level) const {
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indent(out, indent_level) << "PointParticleRenderer:\n";
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indent(out, indent_level + 2) << "_start_color "<<_start_color<<"\n";
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indent(out, indent_level + 2) << "_end_color "<<_end_color<<"\n";
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indent(out, indent_level + 2) << "_point_size "<<_point_size<<"\n";
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indent(out, indent_level + 2) << "_point_primitive "<<_point_primitive<<"\n";
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indent(out, indent_level + 2) << "_max_pool_size "<<_max_pool_size<<"\n";
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indent(out, indent_level + 2) << "_blend_type "<<_blend_type<<"\n";
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indent(out, indent_level + 2) << "_blend_method "<<_blend_method<<"\n";
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indent(out, indent_level + 2) << "_aabb_min "<<_aabb_min<<"\n";
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indent(out, indent_level + 2) << "_aabb_max "<<_aabb_max<<"\n";
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BaseParticleRenderer::write(out, indent_level + 2);
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}
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