ParticleEmitterComponent.hpp

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#pragma once
 
#include <glm/glm.hpp>
 
#include <AssetManager/Asset.hpp>
#include <AssetManager/Material.hpp>
#include <Components/BaseComponent.hpp>
 
namespace shkyera {
 
struct ParticleEmitterComponent : BaseComponent<ParticleEmitterComponent> {
  bool enabled{true};
 
  float gravity{0.1f};
 
  float emittedAtRadius{1.0f};
  float emittedPerSecond{30.0f};
  float emittedPerSecondVariance{0.1f};
 
  float initialVelocity{1.0f};
  float initialVelocityVariance{0.1f};
  float initialVelocityDispersion{-0.5f};
 
  float lifetime{1.0f};
  float lifetimeVariance{0.1f};
 
  float initialParticleSize{0.1f};
  float initialParticleSizeVariance{0.1f};
  float endParticleSize{0.0f};
  float endParticleSizeVariance{0.1f};
 
  HandleAndAsset<Material> material{};
  float initialTransparency{1.0f};
  float initialTransparencyVariance{0.1f};
  float endTransparency{0.1f};
  float endTransparencyVariance{0.1f};
 
  struct state {
    double accumulatedEmittedParticles{0.0};  //< Used for spawning at low emission rates
    size_t nextFreeIndex{0};                  //< Used for ring-buffer behavior
 
    std::vector<float> lifetimes{};
    std::vector<float> endToStartProgress{};
    std::vector<float> initialLifetimes{};
 
    std::vector<float> sizes{};
    std::vector<float> initialSizes{};
    std::vector<float> endSizes{};
 
    std::vector<float> transparencies{};
    std::vector<float> initialTransparencies{};
    std::vector<float> endTransparencies{};
 
    std::vector<glm::vec3> positions{};   //< World CS
    std::vector<glm::vec3> velocities{};  //< World CS
  } state;
};
 
}  // namespace shkyera