add particles.emit(...) (WIP)

src/presets/ParticlesPreset.hpp

@@ -11,8 +11,20 @@ struct ParticlesPreset : public Serializable {
     bool lighting = true;
     /// @brief Max distance of actually spawning particles.
     float maxDistance = 32.0f;
+    /// @brief Particles spawn interval
+    float spawnInterval = 0.1f;
+    /// @brief Particle life time
+    float lifetime = 5.0f;
+    /// @brief Initial velocity
+    glm::vec3 velocity {};
     /// @brief Velocity acceleration
     glm::vec3 acceleration {0.0f, -16.0f, 0.0f};
+    /// @brief Random velocity magnitude applying to spawned particles.
+    glm::vec3 explosion {2.0f};
+    /// @brief Particle size
+    glm::vec3 size {0.1f};
+    /// @brief Texture name
+    std::string texture = "";
 
     dv::value serialize() const override;
     void deserialize(const dv::value& src) override;