PointsParticleSystemInternal.cpp

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#include <tdme/engine/subsystems/particlesystem/PointsParticleSystemInternal.h>
 
#include <memory>
#include <string>
#include <vector>
 
#include <tdme/tdme.h>
#include <tdme/engine/Texture.h>
#include <tdme/engine/fileio/textures/TextureReader.h>
#include <tdme/engine/Color4.h>
#include <tdme/engine/primitives/BoundingBox.h>
#include <tdme/engine/subsystems/manager/TextureManager.h>
#include <tdme/engine/subsystems/particlesystem/Particle.h>
#include <tdme/engine/subsystems/particlesystem/ParticleEmitter.h>
#include <tdme/engine/subsystems/particlesystem/ParticleSystemInternal.h>
#include <tdme/engine/subsystems/renderer/Renderer.h>
#include <tdme/engine/subsystems/rendering/TransparentRenderPointsPool.h>
#include <tdme/engine/Engine.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>
#include <tdme/utilities/Console.h>
 
using std::make_unique;
using std::string;
using std::unique_ptr;
using std::vector;
 
using tdme::engine::Texture;
using tdme::engine::fileio::textures::TextureReader;
using tdme::engine::Color4;
using tdme::engine::primitives::BoundingBox;
using tdme::engine::subsystems::manager::TextureManager;
using tdme::engine::subsystems::particlesystem::Particle;
using tdme::engine::subsystems::particlesystem::ParticleEmitter;
using tdme::engine::subsystems::particlesystem::ParticleSystemInternal;
using tdme::engine::subsystems::particlesystem::PointsParticleSystemInternal;
using tdme::engine::subsystems::renderer::Renderer;
using tdme::engine::subsystems::rendering::TransparentRenderPointsPool;
using tdme::engine::Engine;
using tdme::engine::Timing;
using tdme::engine::Transform;
using tdme::math::Math;
using tdme::math::Matrix4x4;
using tdme::math::Vector3;
using tdme::utilities::Console;
 
PointsParticleSystemInternal::PointsParticleSystemInternal(const string& id, ParticleEmitter* emitter, int32_t maxPoints, float pointSize, bool autoEmit, Texture* texture, int32_t textureHorizontalSprites, int32_t textureVerticalSprites, float fps)
{
    this->id = id;
    this->enabled = true;
    // will be activated on emit and auto unactivated if no more active particles
    this->active = false;
    this->emitter = unique_ptr<ParticleEmitter>(emitter);
    particles.resize(maxPoints);
    this->maxPoints = maxPoints;
    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->pointSize = pointSize;
    this->pointSizeScale = 1.0f;
    this->autoEmit = autoEmit;
    this->particlesToSpawnRemainder = 0.0f;
    this->pointsRenderPool = nullptr;
    this->texture = texture;
    this->textureHorizontalSprites = textureHorizontalSprites;
    this->textureVerticalSprites = textureVerticalSprites;
    this->fps = fps;
    this->pointsRenderPool = make_unique<TransparentRenderPointsPool>(maxPoints);
    this->texture = texture != nullptr?texture:TextureReader::read("resources/engine/textures", "point.png");
    this->entityTransformMatrix.identity();
}
 
PointsParticleSystemInternal::~PointsParticleSystemInternal() {
    if (texture != nullptr) texture->releaseReference();
}
 
void PointsParticleSystemInternal::initialize() {
}
 
void PointsParticleSystemInternal::update()
{
    Transform::update();
    //
    auto entityTransform = parentTransform * (*this);
    entityTransformMatrix = entityTransform.getTransformMatrix();
    //
    updateInternal();
}
 
void PointsParticleSystemInternal::setTransform(const Transform& transform)
{
    Transform::setTransform(transform);
    //
    auto entityTransform = parentTransform * (*this);
    entityTransformMatrix = entityTransform.getTransformMatrix();
    //
    updateInternal();
}
 
void PointsParticleSystemInternal::updateParticles()
{
    if (enabled == false || active == false)
        return;
 
    //
    Vector3 center;
    const auto& localTransformMatrix = localTransform.getTransformMatrix();
    localTransformMatrix.getTranslation(center);
    center.add(emitter->getCenter());
    //
    Vector3 point;
    Vector3 velocityForTime;
    //
    auto first = false;
    // compute distance from camera
    float distanceFromCamera;
    // process particles
    pointsRenderPool->reset();
    auto activeParticles = 0;
    auto timeDelta = engine->getTiming()->getDeltaTime();
    for (auto i = 0; i < particles.size(); i++) {
        auto& particle = particles[i];
        if (particle.active == false)
            continue;
 
        // life time
        particle.lifeTimeCurrent += timeDelta;
        // crop to max life time
        if (particle.lifeTimeCurrent >= particle.lifeTimeMax) {
            particle.active = false;
            continue;
        }
        // sprite index
        particle.spriteIndex+= (static_cast<float>(timeDelta) / 1000.0f) * fps;
        // add gravity if our particle have a noticeable 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));
        // color
        auto& color = particle.color;
        const auto& colorAdd = particle.colorAdd;
        color[0] += colorAdd[0] * static_cast<float>(timeDelta);
        color[1] += colorAdd[1] * static_cast<float>(timeDelta);
        color[2] += colorAdd[2] * static_cast<float>(timeDelta);
        color[3] += colorAdd[3] * static_cast<float>(timeDelta);
        //
        activeParticles++;
        // set up bounding box
        point = localTransformMatrix.multiply(particle.position);
        point.add(center);
        //
        if (first == false) {
            boundingBox.getMin().set(point);
            boundingBox.getMax().set(point);
            first = true;
        } else {
            boundingBox.extend(point);
        }
        // transform particle according to its transform
        point = entityTransformMatrix.multiply(point);
        // add to render points pool
        pointsRenderPool->addPoint(point, static_cast<uint16_t>(particle.spriteIndex) % (textureHorizontalSprites * textureVerticalSprites), color, 0, this);
    }
    // auto disable particle system if no more active particles
    if (activeParticles == 0) {
        active = false;
        return;
    }
    // scale a bit up to make picking work better
    boundingBox.update();
    worldBoundingBox.fromBoundingVolumeWithTransformMatrix(&boundingBox, entityTransformMatrix);
    worldBoundingBox.getMin().sub(0.05f + pointSize * pointSizeScale);
    worldBoundingBox.getMax().add(0.05f + pointSize * pointSizeScale);
    worldBoundingBox.update();
}
 
void PointsParticleSystemInternal::dispose()
{
    pointsRenderPool = nullptr;
}
 
int32_t PointsParticleSystemInternal::emitParticles()
{
    // enable particle system
    active = true;
    // delta time
    auto timeDelta = engine->getTiming()->getDeltaTime();
    // determine particles to spawn
    auto particlesToSpawn = 0;
    {
        if (autoEmit == true) {
            auto particlesToSpawnWithFraction = emitter->getCount() * engine->getTiming()->getDeltaTime() / 1000.0f;
            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;
    //
    Vector3 velocityForTime;
    // 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);
        // add gravity if our particle have a noticable mass, add translation
        // add some movement with a min of 0 time delta and a max of engine time delta
        auto timeDeltaRnd = static_cast<int64_t>((Math::random() * timeDelta));
        if (particle.mass > Math::EPSILON)
            particle.velocity.sub(Vector3(0.0f, 0.5f * Math::G * static_cast<float>(timeDeltaRnd) / 1000.0f, 0.0f));
        particle.position.add(velocityForTime.set(particle.velocity).scale(timeDeltaRnd / 1000.0f));
        //
        particlesSpawned++;
        // finished?
        if (particlesSpawned == particlesToSpawn) break;
 
    }
    return particlesSpawned;
}