BoundingBoxParticleEmitter.cpp

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#include <tdme/engine/subsystems/particlesystem/BoundingBoxParticleEmitter.h>
 
#include <tdme/tdme.h>
#include <tdme/engine/model/Color4.h>
#include <tdme/engine/model/Color4Base.h>
#include <tdme/engine/primitives/BoundingVolume.h>
#include <tdme/engine/primitives/OrientedBoundingBox.h>
#include <tdme/engine/subsystems/particlesystem/Particle.h>
#include <tdme/engine/Transformations.h>
#include <tdme/math/Math.h>
#include <tdme/math/Vector3.h>
 
using tdme::engine::model::Color4;
using tdme::engine::model::Color4Base;
using tdme::engine::primitives::BoundingVolume;
using tdme::engine::primitives::OrientedBoundingBox;
using tdme::engine::subsystems::particlesystem::BoundingBoxParticleEmitter;
using tdme::engine::subsystems::particlesystem::Particle;
using tdme::engine::Transformations;
using tdme::math::Math;
using tdme::math::Vector3;
 
BoundingBoxParticleEmitter::BoundingBoxParticleEmitter(int32_t count, int64_t lifeTime, int64_t lifeTimeRnd, float mass, float massRnd, OrientedBoundingBox* obb, const Vector3& velocity, const Vector3& velocityRnd, const Color4& colorStart, const Color4& colorEnd)
{
    this->count = count;
    this->lifeTime = lifeTime;
    this->lifeTimeRnd = lifeTimeRnd;
    this->mass = mass;
    this->massRnd = massRnd;
    this->obb = obb;
    this->velocity.set(velocity);
    this->velocityRnd.set(velocityRnd);
    this->colorStart.set(colorStart);
    this->colorEnd.set(colorEnd);
    this->obbTransformed = static_cast<OrientedBoundingBox*>(obb->clone());
}
 
BoundingBoxParticleEmitter::~BoundingBoxParticleEmitter() {
    delete obb;
    delete obbTransformed;
}
 
void BoundingBoxParticleEmitter::emit(Particle* particle)
{
    Vector3 tmpAxis;
    // set up particle
    particle->active = true;
    particle->spriteIndex = 0.0f;
    auto obbAxes = obbTransformed->getAxes();
    auto& obbHalfExtensionXYZ = obbTransformed->getHalfExtension().getArray();
    // emit particle in oriented bounding box
    particle->position.set(0.0f, 0.0f, 0.0f);
    particle->position.add(tmpAxis.set(obbAxes[0]).scale((static_cast<float>(Math::random()) * obbHalfExtensionXYZ[0] * 2.0f) - obbHalfExtensionXYZ[0]));
    particle->position.add(tmpAxis.set(obbAxes[1]).scale((static_cast<float>(Math::random()) * obbHalfExtensionXYZ[1] * 2.0f) - obbHalfExtensionXYZ[1]));
    particle->position.add(tmpAxis.set(obbAxes[2]).scale((static_cast<float>(Math::random()) * obbHalfExtensionXYZ[2] * 2.0f) - obbHalfExtensionXYZ[2]));
    // compute velocity
    particle->velocity.set(
        velocity[0] + (Math::random() * velocityRnd[0] * (Math::random() > 0.5 ? +1.0f : -1.0f)),
        velocity[1] + (Math::random() * velocityRnd[1] * (Math::random() > 0.5 ? +1.0f : -1.0f)),
        velocity[2] + (Math::random() * velocityRnd[2] * (Math::random() > 0.5 ? +1.0f : -1.0f))
    );
    // mass
    particle->mass = mass + (Math::random() * (massRnd));
    // life time
    particle->lifeTimeMax = lifeTime + (Math::random() * lifeTimeRnd);
    particle->lifeTimeCurrent = 0LL;
    // color
    particle->color.set(colorStart);
    particle->colorAdd.set(
        (colorEnd.getRed() - colorStart.getRed()) / particle->lifeTimeMax,
        (colorEnd.getGreen() - colorStart.getGreen()) / particle->lifeTimeMax,
        (colorEnd.getBlue() - colorStart.getBlue()) / particle->lifeTimeMax,
        (colorEnd.getAlpha() - colorStart.getAlpha()) / particle->lifeTimeMax);
}
 
void BoundingBoxParticleEmitter::fromTransformations(const Transformations& transformations)
{
    Vector3 center;
    Vector3 scale;
    array<Vector3, 3> axes;
    array<Vector3, 3> axesTransformed;
    Vector3 halfExtension;
    auto& transformationsMatrix = transformations.getTransformationsMatrix();
    // apply rotation, scale, translation
    center = transformationsMatrix.multiply(obb->getCenter());
    // apply transformations rotation to axis
    axesTransformed[0] = transformationsMatrix.multiplyNoTranslation(obb->getAxes()[0]);
    axesTransformed[1] = transformationsMatrix.multiplyNoTranslation(obb->getAxes()[1]);
    axesTransformed[2] = transformationsMatrix.multiplyNoTranslation(obb->getAxes()[2]);
    // scale
    scale.set(
        axesTransformed[0].computeLength(),
        axesTransformed[1].computeLength(),
        axesTransformed[2].computeLength()
    );
    // set up axes
    axes[0].set(axesTransformed[0]).normalize();
    axes[1].set(axesTransformed[1]).normalize();
    axes[2].set(axesTransformed[2]).normalize();
    // apply scale to half extension
    halfExtension.set(obb->getHalfExtension());
    halfExtension.scale(scale);
    *obbTransformed = OrientedBoundingBox(center, axes[0], axes[1], axes[2], halfExtension);
}