91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
#pragma once
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#include <vector>
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#include <variant>
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#include <glm/glm.hpp>
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#include "typedefs.hpp"
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#include "maths/UVRegion.hpp"
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#include "maths/util.hpp"
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#include "presets/ParticlesPreset.hpp"
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class Level;
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class Emitter;
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struct Particle {
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/// @brief Pointer used to access common behaviour.
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/// Emitter must be utilized after all related particles despawn.
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Emitter* emitter;
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/// @brief Some random integer for visuals configuration.
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int random;
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/// @brief Global position
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glm::vec3 position;
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/// @brief Linear velocity
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glm::vec3 velocity;
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/// @brief Remaining life time
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float lifetime;
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/// @brief UV region
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UVRegion region;
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/// @brief Current rotation angle
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float angle;
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};
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class Texture;
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using EmitterOrigin = std::variant<glm::vec3, entityid_t>;
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class Emitter {
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const Level& level;
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/// @brief Static position or entity
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EmitterOrigin origin;
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/// @brief Particle prototype
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Particle prototype;
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/// @brief Particle texture
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const Texture* texture;
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/// @brief Number of particles should be spawned before emitter deactivation.
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/// -1 is infinite.
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int count;
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/// @brief Spawn timer used to determine number of particles
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/// to spawn on update. May be innacurate.
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float timer = 0.0f;
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util::PseudoRandom random;
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public:
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ParticlesPreset preset;
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Emitter(
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const Level& level,
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std::variant<glm::vec3, entityid_t> origin,
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ParticlesPreset preset,
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const Texture* texture,
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const UVRegion& region,
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int count
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);
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explicit Emitter(const Emitter&) = delete;
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/// @return Emitter particles texture
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const Texture* getTexture() const;
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/// @brief Update emitter and spawn particles
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/// @param delta delta time
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/// @param cameraPosition current camera global position
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/// @param particles destination particles vector
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void update(
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float delta,
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const glm::vec3& cameraPosition,
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std::vector<Particle>& particles
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);
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/// @brief Set remaining particles count to 0
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void stop();
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/// @return true if the emitter has spawned all particles
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bool isDead() const;
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const EmitterOrigin& getOrigin() const;
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void setOrigin(const EmitterOrigin& origin);
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};
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