add 'spawn_spread' and 'spawn_shape'

src/presets/ParticlesPreset.cpp

@@ -2,6 +2,25 @@
 
 #include "data/dv_util.hpp"
 
+std::string to_string(ParticleSpawnShape shape) {
+    static std::string names[] = {
+        "ball",
+        "sphere",
+        "box"
+    };
+    return names[static_cast<int>(shape)];
+}
+
+ParticleSpawnShape ParticleSpawnShape_from(std::string_view s) {
+    if (s == "ball") {
+        return ParticleSpawnShape::BALL;
+    } else if (s == "sphere") {
+        return ParticleSpawnShape::SPHERE;
+    } else {
+        return ParticleSpawnShape::BOX;
+    }
+}
+
 dv::value ParticlesPreset::serialize() const {
     auto root = dv::object();
     root["texture"] = texture;
@@ -14,6 +33,8 @@ dv::value ParticlesPreset::serialize() const {
     root["acceleration"] = dv::to_value(acceleration);
     root["explosion"] = dv::to_value(explosion);
     root["size"] = dv::to_value(size);
+    root["spawn_spread"] = dv::to_value(size);
+    root["spawn_shape"] = to_string(spawnShape);
     root["random_sub_uv"] = randomSubUV;
     return root;
 }
@@ -33,7 +54,13 @@ void ParticlesPreset::deserialize(const dv::value& src) {
     if (src.has("size")) {
         dv::get_vec(src["size"], size);
     }
+    if (src.has("spawn_spread")) {
+        dv::get_vec(src["spawn_spread"], spawnSpread);
+    }
     if (src.has("explosion")) {
         dv::get_vec(src["explosion"], explosion);
     }
+    if (src.has("spawn_shape")) {
+        spawnShape = ParticleSpawnShape_from(src["spawn_shape"].asString());
+    }
 }