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}
+};

src/logic/scripting/scripting_hud.cpp

@@ -4,6 +4,7 @@
 #include "engine.hpp"
 #include "files/files.hpp"
 #include "frontend/hud.hpp"
+#include "graphics/render/WorldRenderer.hpp"
 #include "objects/Player.hpp"
 #include "lua/libs/api_lua.hpp"
 #include "lua/lua_engine.hpp"
@@ -14,10 +15,14 @@ using namespace scripting;
 static debug::Logger logger("scripting-hud");
 
 Hud* scripting::hud = nullptr;
+WorldRenderer* scripting::renderer = nullptr;
 
-void scripting::on_frontend_init(Hud* hud) {
+void scripting::on_frontend_init(Hud* hud, WorldRenderer* renderer) {
     scripting::hud = hud;
+    scripting::renderer = renderer;
+
     lua::openlib(lua::get_main_state(), "hud", hudlib);
+    lua::openlib(lua::get_main_state(), "particles", particleslib);
 
     for (auto& pack : engine->getContentPacks()) {
         lua::emit_event(

src/logic/scripting/scripting_hud.hpp

@@ -8,20 +8,20 @@
 namespace fs = std::filesystem;
 
 class Hud;
+class WorldRenderer;
 
 namespace scripting {
     extern Hud *hud;
+    extern WorldRenderer* renderer;
 
-    void on_frontend_init(Hud *hud);
+    void on_frontend_init(Hud* hud, WorldRenderer* renderer);
     void on_frontend_render();
     void on_frontend_close();
 
-    /**
-     * Load package-specific hud script
-     * @param env environment id
-     * @param packid content-pack id
-     * @param file script file path
-     */
+    /// @brief Load package-specific hud script
+    /// @param env environment id
+    /// @param packid content-pack id
+    /// @param file script file path
     void load_hud_script(
         const scriptenv &env, const std::string &packid, const fs::path &file
     );