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/*
render/particles.cc
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
#include "render/particles.h"
#include "render/camera.h"
#include "render/gl.h"
#include "render/draw.h"
#include "render/textures.h"
#include "core/application.h"
namespace render {
/* ---- class Particle --------------------------------------------- */
Particle::Particle(const math::Vector3f &location, float time) : particle_location(location)
{
particle_time = time;
}
Particle::Particle(const math::Vector3f &location, const math::Vector3f &up, const math::Vector3f &left, float time) : particle_location(location), particle_up(up), particle_left(left)
{
particle_time = time;
}
/* ---- class ParticleStream --------------------------------------- */
ParticleStream::ParticleStream(const math::Vector3f &location, const math::Color &color, float radius, size_t texture, core::EntityControlable *entity, bool oriented) : particles_location(location), particles_color(color)
{
particles_texture = texture;
particles_entity = entity;
if (!entity) {
particles_oriented = false;
} else {
particles_oriented = oriented;
}
particles_radius = radius;
particles_timeout = 1.5f; // a particles lives for 3 seconds
particles_eject = 0.02f; // a particle is ejected every 0.2 seconds
particles_last_eject = 0; // timestamp of the last eject
}
ParticleStream::~ParticleStream()
{
for (Particles::iterator it = particles_stream.begin(); it != particles_stream.end(); it++) {
delete (*it);
}
particles_stream.clear();
}
void ParticleStream::draw() {
float now = core::application()->time();
// remove dead particles
Particles::iterator it = particles_stream.begin();
while ((it != particles_stream.end()) && ((*it)->time() + particles_timeout <= now)) {
delete (*it);
particles_stream.erase(it);
it = particles_stream.begin();
}
// add new particles
if (particles_last_eject + particles_eject <= now) {
if (particles_entity) {
float u = 0;
if ((particles_entity->eventstate() == core::Entity::ImpulseInitiate ) || (particles_entity->eventstate() == core::Entity::Impulse)) {
u = 1.0f;
} else if(particles_entity->eventstate() == core::Entity::Normal) {
u = particles_entity->thrust();
}
if (u > 0.0f) {
math::Vector3f l(particles_entity->location() + (particles_entity->axis() * location()));
Particle *p = 0;
if (particles_oriented) {
p = new Particle(l, particles_entity->axis().up(), particles_entity->axis().left(), now);
} else {
p = new Particle(l, now);
}
particles_stream.push_back(p);
}
} else {
particles_stream.push_back(new Particle(location(), now));
}
particles_last_eject = now;
}
math::Vector3f quad[4];
if (particles_stream.size()) {
Textures::bind(particles_texture);
gl::begin(gl::Quads);
for (Particles::reverse_iterator rit = particles_stream.rbegin(); rit != particles_stream.rend(); rit++) {
Particle *particle = (*rit);
if (particles_oriented) {
quad[0].assign(particle->up() - particle->left());
quad[1].assign(particle->up() + particle->left());
quad[2].assign(particle->up() * -1 + particle->left());
quad[3].assign(particle->up() * -1 - particle->left());
} else {
quad[0].assign(Camera::axis().up() - Camera::axis().left());
quad[1].assign(Camera::axis().up() + Camera::axis().left());
quad[2].assign(Camera::axis().up() * -1 + Camera::axis().left());
quad[3].assign(Camera::axis().up() * -1 - Camera::axis().left());
}
float t = now - particle->time();
float f = 0;
if (t < particles_timeout * 0.1f) {
f = t / (0.1f * particles_timeout);
} else {
t = t - particles_timeout * 0.1f;
f = t / (0.9f * particles_timeout);
f = 1.0 - f;
}
f *= f;
float radius = particles_radius * f;
particles_color.a = f;
gl::color(particles_color);
glTexCoord2f(0,1);
gl::vertex(particle->location() + quad[0] * radius);
glTexCoord2f(0,0);
gl::vertex(particle->location() + quad[1] * radius);
glTexCoord2f(1,0);
gl::vertex(particle->location() + quad[2] * radius);
glTexCoord2f(1,1);
gl::vertex(particle->location() + quad[3] * radius);
Stats::quads++;
}
gl::end();
}
}
} // namespace render
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