ObjectParticleSystemInternal.cpp

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#include <tdme/engine/subsystems/particlesystem/ObjectParticleSystemInternal.h>
 
#include <algorithm>
#include <memory>
#include <string>
#include <vector>
 
#include <tdme/tdme.h>
#include <tdme/engine/Color4.h>
#include <tdme/engine/model/Model.h>
#include <tdme/engine/primitives/BoundingBox.h>
#include <tdme/engine/subsystems/particlesystem/Particle.h>
#include <tdme/engine/subsystems/particlesystem/ParticleEmitter.h>
#include <tdme/engine/subsystems/rendering/ObjectBase.h>
#include <tdme/engine/subsystems/rendering/ObjectInternal.h>
#include <tdme/engine/Engine.h>
#include <tdme/engine/Entity.h>
#include <tdme/engine/Object.h>
#include <tdme/engine/Timing.h>
#include <tdme/engine/Transform.h>
#include <tdme/math/Math.h>
#include <tdme/math/Matrix4x4.h>
#include <tdme/math/Vector3.h>
 
using std::make_unique;
using std::remove;
using std::string;
using std::to_string;
using std::unique_ptr;
using std::vector;
 
using tdme::engine::Color4;
using tdme::engine::model::Model;
using tdme::engine::primitives::BoundingBox;
using tdme::engine::subsystems::particlesystem::ObjectParticleSystemInternal;
using tdme::engine::subsystems::particlesystem::Particle;
using tdme::engine::subsystems::particlesystem::ParticleEmitter;
using tdme::engine::subsystems::rendering::ObjectBase;
using tdme::engine::subsystems::rendering::ObjectInternal;
using tdme::engine::Engine;
using tdme::engine::Entity;
using tdme::engine::Object;
using tdme::engine::Timing;
using tdme::engine::Transform;
using tdme::math::Math;
using tdme::math::Matrix4x4;
using tdme::math::Vector3;
 
ObjectParticleSystemInternal::ObjectParticleSystemInternal(const string& id, Model* model, const Vector3& scale, bool autoEmit, bool contributesShadows, bool receivesShadows, int32_t maxCount, ParticleEmitter* emitter)
{
    this->id = id;
    this->enabled = true;
    this->model = model;
    this->objectScale = scale;
    this->autoEmit = autoEmit;
    this->contributesShadows = contributesShadows;
    this->receivesShadows = receivesShadows;
    particles.resize(maxCount);
    objects.resize(maxCount);
    for (auto i = 0; i < objects.size(); i++) {
        objects[i] = new Object(
            "tdme.opse." +
                id +
                ":" +
                to_string(i),
            model
        );
        objects[i]->setEnabled(false);
        objects[i]->setScale(objectScale);
        objects[i]->setContributesShadows(contributesShadows);
        objects[i]->setReceivesShadows(receivesShadows);
        objects[i]->setPickable(false);
    }
    this->emitter = unique_ptr<ParticleEmitter>(emitter);
    this->effectColorMul.set(1.0f, 1.0f, 1.0f, 1.0f);
    this->effectColorAdd.set(0.0f, 0.0f, 0.0f, 0.0f);
    this->pickable = false;
    this->particlesToSpawnRemainder = 0.0f;
}
 
ObjectParticleSystemInternal::~ObjectParticleSystemInternal() {
    for (auto i = 0; i < objects.size(); i++) delete objects[i];
}
 
const string& ObjectParticleSystemInternal::getId()
{
    return id;
}
 
void ObjectParticleSystemInternal::setEngine(Engine* engine)
{
    this->engine = engine;
    for (auto i = 0; i < objects.size(); i++) {
        objects[i]->setEngine(engine);
    }
}
 
void ObjectParticleSystemInternal::setRenderer(Renderer* renderer)
{
    this->renderer = renderer;
    for (auto i = 0; i < objects.size(); i++) {
        objects[i]->setRenderer(renderer);
    }
}
 
void ObjectParticleSystemInternal::update()
{
    Transform::update();
    //
    auto entityTransform = parentTransform * (*this);
    entityTransformMatrix = entityTransform.getTransformMatrix();
    //
    updateInternal();
}
 
void ObjectParticleSystemInternal::setTransform(const Transform& transform)
{
    Transform::setTransform(transform);
    //
    auto entityTransform = parentTransform * (*this);
    entityTransformMatrix = entityTransform.getTransformMatrix();
    //
    updateInternal();
}
 
int32_t ObjectParticleSystemInternal::emitParticles()
{
    // particles to spawn
    auto particlesToSpawn = 0;
    {
        auto particlesToSpawnWithFraction = emitter->getCount() * engine->getTiming()->getDeltaTime() / 1000.0f;
        if (autoEmit == true) {
            particlesToSpawn = static_cast<int32_t>(particlesToSpawnWithFraction);
            particlesToSpawnRemainder += particlesToSpawnWithFraction - particlesToSpawn;
            if (particlesToSpawnRemainder > 1.0f) {
                particlesToSpawn++;
                particlesToSpawnRemainder -= 1.0f;
            }
        } else {
            particlesToSpawn = emitter->getCount();
        }
    }
    // skip if nothing to spawn
    if (particlesToSpawn == 0) return 0;
    // spawn
    auto particlesSpawned = 0;
    for (auto i = 0; i < particles.size(); i++) {
        auto& particle = particles[i];
        if (particle.active == true) continue;
        // emit particle
        emitter->emit(&particle);
        // enable object
        auto object = objects[i];
        object->setTranslation(particle.position);
        object->update();
        object->setEnabled(true);
        object->setEffectColorAdd(effectColorAdd);
        object->setEffectColorMul(effectColorMul);
        enabledObjects.push_back(object);
        // all particles spawned?
        particlesSpawned++;
        if (particlesSpawned == particlesToSpawn) break;
    }
    // done
    return particlesSpawned;
}
 
void ObjectParticleSystemInternal::updateParticles()
{
    //
    Vector3 center;
    auto& localTransformMatrix = localTransform.getTransformMatrix();
    localTransformMatrix.getTranslation(center);
    center.add(emitter->getCenter());
    //
    Vector3 point;
    Vector3 velocityForTime;
    auto first = true;
    auto timeDelta = engine->getTiming()->getDeltaTime();
    for (auto i = 0; i < particles.size(); i++) {
        auto& particle = particles[i];
        if (particle.active == false)
            continue;
 
        auto object = objects[i];
        // life time
        particle.lifeTimeCurrent += timeDelta;
        if (particle.lifeTimeCurrent >= particle.lifeTimeMax) {
            particle.active = false;
            object->setEnabled(false);
            enabledObjects.erase(remove(enabledObjects.begin(), enabledObjects.end(), object), enabledObjects.end());
            continue;
        }
        // add gravity if our particle have a noticable mass
        if (particle.mass > Math::EPSILON)
            particle.velocity.sub(Vector3(0.0f, 0.5f * Math::G * static_cast<float>(timeDelta) / 1000.0f, 0.0f));
        // TODO:
        //  maybe take air resistance into account like a huge paper needs more time to fall than a sphere of paper
        //  or heat for smoke or fire, whereas having no mass for those particles works around this problem for now
        // translation
        particle.position.add(velocityForTime.set(particle.velocity).scale(static_cast<float>(timeDelta) / 1000.0f));
        // update up effect colors
        object->setEffectColorAdd(effectColorAdd);
        object->setEffectColorMul(effectColorMul);
        // translation
        point = localTransformMatrix.multiply(particle.position);
        point.add(center);
        // transform particle according to its transform
        point = entityTransformMatrix.multiply(point);
        // apply to object
        object->setTranslation(point);
        object->update();
        if (first == true) {
            worldBoundingBox = *object->getWorldBoundingBox();
            first = false;
        } else {
            worldBoundingBox.extend(object->getWorldBoundingBox());
        }
    }
    // compute bounding boxes
    worldBoundingBox.update();
    boundingBox.fromBoundingVolumeWithTransformMatrix(&worldBoundingBox, inverseTransformMatrix);
}
 
void ObjectParticleSystemInternal::dispose()
{
    for (auto i = 0; i < objects.size(); i++) {
        objects[i]->dispose();
    }
}