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

src/logic/scripting/lua/libs/api_lua.hpp

@@ -31,6 +31,7 @@ extern const luaL_Reg itemlib[];
 extern const luaL_Reg jsonlib[];
 extern const luaL_Reg mat4lib[];
 extern const luaL_Reg packlib[];
+extern const luaL_Reg particleslib[];
 extern const luaL_Reg playerlib[];
 extern const luaL_Reg quatlib[];  // quat.cpp
 extern const luaL_Reg timelib[];

src/logic/scripting/lua/libs/libparticles.cpp

@@ -0,0 +1,44 @@
+#include "api_lua.hpp"
+
+#include "logic/scripting/scripting_hud.hpp"
+#include "graphics/render/WorldRenderer.hpp"
+#include "graphics/render/Emitter.hpp"
+#include "assets/assets_util.hpp"
+#include "engine.hpp"
+
+using namespace scripting;
+
+static int l_emit(lua::State* L) {
+    EmitterOrigin origin;
+    if (lua::istable(L, 1)) {
+        origin = lua::tovec3(L, 1);
+    } else {
+        origin = static_cast<entityid_t>(lua::tointeger(L, 1));
+    }
+    int count = lua::tointeger(L, 2);
+    auto preset = lua::tovalue(L, 3);
+    auto extension = lua::tovalue(L, 4);
+    
+    ParticlesPreset particlesPreset {};
+    particlesPreset.deserialize(preset);
+    if (extension != nullptr) {
+        particlesPreset.deserialize(extension);
+    }
+    auto& assets = *engine->getAssets();
+    auto region = util::get_texture_region(assets, particlesPreset.texture, "");
+    auto emitter = std::make_unique<Emitter>(
+        *level,
+        std::move(origin),
+        std::move(particlesPreset),
+        region.texture,
+        region.region,
+        count
+    );
+    renderer->addEmitter(std::move(emitter));
+    return 0;
+}
+
+const luaL_Reg particleslib[] = {
+    {"emit", lua::wrap<l_emit>},
+    {NULL, NULL}
+};