Adding scripts

src/ScriptEngine.cpp

@@ -0,0 +1,62 @@
+#include "ScriptEngine.h"
+#include "Game.h"
+#include <pybind11/embed.h>
+#include <iostream>
+#include <fstream>
+
+namespace py = pybind11;
+
+// Static pointer used by the embedded module (set before interpreter starts).
+static ZL::Game* s_game = nullptr;
+
+// The embedded module must be defined at file scope before the interpreter
+// is started.  It exposes a minimal surface: one function per scripting command.
+PYBIND11_EMBEDDED_MODULE(game_api, m) {
+    m.doc() = "Game scripting API";
+
+    // npc_walk_to(index, x, y, z)
+    // Tells the NPC at `index` in Game::npcs to walk to world position (x,y,z).
+    m.def("npc_walk_to", [](int index, float x, float y, float z) {
+        if (!s_game) {
+            std::cerr << "[script] game_api.npc_walk_to: engine not ready\n";
+            return;
+        }
+        auto& npcs = s_game->npcs;
+        if (index < 0 || index >= static_cast<int>(npcs.size())) {
+            std::cerr << "[script] game_api.npc_walk_to: index " << index
+                      << " out of range (0.." << npcs.size() - 1 << ")\n";
+            return;
+        }
+        npcs[index]->setTarget(Eigen::Vector3f(x, y, z));
+    },
+    py::arg("index"), py::arg("x"), py::arg("y"), py::arg("z"),
+    "Command NPC[index] to walk to world position (x, y, z).");
+}
+
+namespace ZL {
+
+ScriptEngine::ScriptEngine() = default;
+ScriptEngine::~ScriptEngine() = default;
+
+void ScriptEngine::init(Game* game) {
+    s_game = game;
+    interpreter = std::make_unique<py::scoped_interpreter>();
+    runScript("resources/start.py");
+}
+
+void ScriptEngine::runScript(const std::string& path) {
+    std::ifstream file(path);
+    if (!file.is_open()) {
+        std::cerr << "[script] Could not open script: " << path << "\n";
+        return;
+    }
+    std::string source((std::istreambuf_iterator<char>(file)),
+                        std::istreambuf_iterator<char>());
+    try {
+        py::exec(source);
+    } catch (const py::error_already_set& e) {
+        std::cerr << "[script] Error in " << path << ":\n" << e.what() << "\n";
+    }
+}
+
+} // namespace ZL