77 lines
1.6 KiB
C++
77 lines
1.6 KiB
C++
#pragma once
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#include "defines.h"
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#include "colour.h"
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#include <glm/glm.hpp>
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#include <vector>
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BEGIN_NAMESPACE
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struct particle;
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struct particle_emitter;
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struct particle_modifier;
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using particle_list = std::vector<particle *>;
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using particle_emitter_list = std::vector<particle_emitter *>;
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using particle_modifier_list = std::vector<particle_modifier *>;
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struct particle {
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glm::vec3 position;
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glm::vec3 old_pos;
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glm::vec3 velocity;
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colour color;
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float life;
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float size;
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};
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struct particle_emitter {
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particle_emitter();
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virtual ~particle_emitter() = default;
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particle *new_particle();
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void update(float elapsed_ms);
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virtual void spawn(particle *p) = 0;
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particle_list particles;
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particle_list dead_particles;
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glm::vec3 position{};
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float emission_rate{}; // particles per second
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float to_spawn;
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float life_decay{};
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colour start_colour{};
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colour end_colour{};
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float start_size;
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float end_size;
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};
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struct particle_modifier {
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virtual void affect_particle(particle *p, float elapsed_ms) = 0;
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};
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struct particle_system {
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void update(float elapsed_ms);
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void render();
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particle_list particles;
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particle_emitter_list emitters;
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particle_modifier_list modifiers;
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};
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struct dot_particle_emitter : particle_emitter {
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dot_particle_emitter();
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void spawn(particle *p) override;
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};
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struct particle_attractor : particle_modifier {
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void init(glm::vec3& center, float strength_);
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void affect_particle(particle *p, float elapsed_ms) override;
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glm::vec3 attractor_center;
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float strength;
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};
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END_NAMESPACE
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