refactor assets library

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

@@ -0,0 +1,50 @@
+#include "api_lua.hpp"
+
+#include "assets/Assets.hpp"
+#include "coders/png.hpp"
+#include "debug/Logger.hpp"
+#include "engine/Engine.hpp"
+#include "graphics/core/Texture.hpp"
+#include "util/Buffer.hpp"
+
+using namespace scripting;
+
+static void load_texture(
+    const ubyte* bytes, size_t size, const std::string& destname
+) {
+    try {
+        engine->getAssets()->store(png::load_texture(bytes, size), destname);
+    } catch (const std::runtime_error& err) {
+        debug::Logger logger("lua.assetslib");
+        logger.error() << err.what();
+    }
+}
+
+static int l_load_texture(lua::State* L) {
+    if (lua::istable(L, 1)) {
+        lua::pushvalue(L, 1);
+        size_t size = lua::objlen(L, 1);
+        util::Buffer<ubyte> buffer(size);
+        for (size_t i = 0; i < size; i++) {
+            lua::rawgeti(L, i + 1);
+            buffer[i] = lua::tointeger(L, -1);
+            lua::pop(L);
+        }
+        lua::pop(L);
+        load_texture(buffer.data(), buffer.size(), lua::require_string(L, 2));
+    } else {
+        auto string = lua::bytearray_as_string(L, 1);
+        load_texture(
+            reinterpret_cast<const ubyte*>(string.data()),
+            string.size(),
+            lua::require_string(L, 2)
+        );
+        lua::pop(L);
+    }
+    return 0;
+}
+
+const luaL_Reg assetslib[] = {
+    {"load_texture", lua::wrap<l_load_texture>},
+    {NULL, NULL}
+};