world previews demo

src/logic/scripting/lua/libworld.cpp

@@ -1,6 +1,10 @@
 #include "lua_commons.h"
 #include "api_lua.h"
 #include "../scripting.h"
+#include "../../../assets/Assets.h"
+#include "../../../coders/imageio.h"
+#include "../../../graphics/core/Texture.h"
+#include "../../../files/engine_paths.h"
 #include "../../../world/Level.h"
 #include "../../../world/World.h"
 #include "../../../engine.h"
@@ -10,6 +14,39 @@
 
 namespace fs = std::filesystem;
 
+static int l_world_get_list(lua_State* L) {
+    auto paths = scripting::engine->getPaths();
+    auto worlds = paths->scanForWorlds();
+
+    lua_createtable(L, worlds.size(), 0);
+    for (size_t i = 0; i < worlds.size(); i++) {
+        lua_createtable(L, 0, 1);
+        
+        auto name = worlds[i].filename().u8string();
+        lua_pushstring(L, name.c_str());
+        lua_setfield(L, -2, "name");
+        
+        // FIXME: hmm
+        auto assets = scripting::engine->getAssets();
+        std::string icon = "world:"+name+".icon";
+
+        if (assets->getTexture(icon) == nullptr) {
+            auto iconfile = worlds[i]/fs::path("preview.png");
+            if (fs::is_regular_file(iconfile)) {
+                auto image = imageio::read(iconfile.string());
+                assets->store(Texture::from(image.get()), icon);
+            } else {
+                icon = "gui/no_world_icon";
+            }
+        }
+        lua_pushstring(L, icon.c_str());
+        lua_setfield(L, -2, "icon");
+        
+        lua_rawseti(L, -2, i + 1);
+    }
+    return 1;
+}
+
 static int l_world_get_total_time(lua_State* L) {
     lua_pushnumber(L, scripting::level->getWorld()->totalTime);
     return 1;
@@ -39,6 +76,7 @@ static int l_world_exists(lua_State* L) {
 }
 
 const luaL_Reg worldlib [] = {
+    {"get_list", lua_wrap_errors<l_world_get_list>},
     {"get_total_time", lua_wrap_errors<l_world_get_total_time>},
     {"get_day_time", lua_wrap_errors<l_world_get_day_time>},
     {"set_day_time", lua_wrap_errors<l_world_set_day_time>},