Fixed heissenbug caused by quat initialization and added sound server.

src/particles.h

@@ -0,0 +1,76 @@
+#pragma once
+
+#include "defines.h"
+#include "colour.h"
+#include <glm/glm.hpp>
+#include <vector>
+
+BEGIN_NAMESPACE
+
+struct particle;
+struct particle_emitter;
+struct particle_modifier;
+
+using particle_list = std::vector<particle *>;
+using particle_emitter_list = std::vector<particle_emitter *>;
+using particle_modifier_list = std::vector<particle_modifier *>;
+
+struct particle {
+    glm::vec3 position;
+    glm::vec3 old_pos;
+    glm::vec3 velocity;
+    colour color;
+    float life;
+    float size;
+};
+
+struct particle_emitter {
+    particle_emitter();
+    virtual ~particle_emitter() = default;
+
+    particle *new_particle();
+    void update(float elapsed_ms);
+
+    virtual void spawn(particle *p) = 0;
+
+    particle_list particles;
+    particle_list dead_particles;
+
+    glm::vec3 position{};
+    float emission_rate{}; // particles per second
+    float to_spawn;
+    float life_decay{};
+    colour start_colour{};
+    colour end_colour{};
+    float start_size;
+    float end_size;
+};
+
+struct particle_modifier {
+    virtual void affect_particle(particle *p, float elapsed_ms) = 0;
+};
+
+struct particle_system {
+    void update(float elapsed_ms);
+    void render();
+
+    particle_list particles;
+    particle_emitter_list emitters;
+    particle_modifier_list modifiers;
+};
+
+struct dot_particle_emitter : particle_emitter {
+    dot_particle_emitter();
+    void spawn(particle *p) override;
+};
+
+
+struct particle_attractor : particle_modifier {
+    void init(glm::vec3& center, float strength_);
+    void affect_particle(particle *p, float elapsed_ms) override;
+
+    glm::vec3 attractor_center;
+    float strength;
+};
+
+END_NAMESPACE