documents/algorithms.txt

@@ -23,5 +23,6 @@ Necessary:
 init_function(map_w, map_h)
 Should initialize the function fresh with a given width and height.
 
-update(map)
+update()
 Called updates_per_second times per second. Should calculate new map state and draw on the map as needed. The map will have the previous state retained.
+Returns true if finished, else false

scripts/algorithms/drunk_walk.lua

@@ -0,0 +1,34 @@
+require "math"
+DrunkenWalk = {
+    curr_x = 0,
+    curr_y = 0,
+    map_w = 0,
+    map_h = 0,
+    iterations = 30
+}
+
+function DrunkenWalk:initialize(w, h)
+    math.randomseed(os.time())
+    self.map_w = w
+    self.map_h = h
+    visualizer.map:fill(true)
+    self.curr_x = math.random(0, w-1)
+    self.curr_y = math.random(0, h-1);
+end
+
+function DrunkenWalk:update()
+    self.curr_x = self.curr_x + math.random(-1, 1)
+    self.curr_y = self.curr_y + math.random(-1, 1)
+    while self.curr_x >= self.map_w or self.curr_x < 0 or self.curr_y >= self.map_h or self.curr_y < 0 do
+        self.curr_x = self.curr_x + math.random(-1, 1)
+        self.curr_y = self.curr_y + math.random(-1, 1)
+    end
+    visualizer.map:draw_floor(self.curr_x, self.curr_y)
+    self.iterations = self.iterations - 1
+    if self.iterations == 0 then
+        return true
+    end
+    return false
+end
+
+visualizer.algorithm_manager:register_algorithm("Drunken Walk", function (w, h) DrunkenWalk:initialize(w, h) end, function () return DrunkenWalk:update() end, 5)

scripts/algorithms/test.lua

@@ -0,0 +1,18 @@
+Test = {}
+
+function Test.initialize(w, h)
+    visualizer.map:fill(false)
+    for mx = 0, w-1 do
+        for my = 0, h-1 do
+            if mx == 0 or mx == w-1 or my == 0 or my == h-1 then
+                visualizer.map:draw_wall(mx, my)
+            end
+        end
+    end
+end
+
+function Test.update()
+
+end
+
+visualizer.algorithm_manager:register_algorithm("Test", Test.initialize, Test.update, 1)

src/engine/scripting/luacontextmanager.cpp

@@ -11,6 +11,6 @@ std::string LuaContextManager::get_key(std::string args) {
 // TODO: Switch the arg to a struct and use that to init libraries
 std::shared_ptr<sol::state> LuaContextManager::load_resource(std::string args) {
     auto lua = std::make_shared<sol::state>();
-    lua->open_libraries(sol::lib::base, sol::lib::package);
+    lua->open_libraries(sol::lib::base, sol::lib::package, sol::lib::math, sol::lib::os);
     return lua;
 }

src/game/algorithmmanager.cpp

@@ -3,8 +3,10 @@
 //
 
 #include "algorithmmanager.hpp"
+#include "../engine/modules/logger.hpp"
 
 #include <utility>
+#include <fmt/format.h>
 
 void AlgorithmManager::register_algorithm(std::string name, sol::function initialize, sol::function update,
                                           unsigned int updates_per_second) {
@@ -19,6 +21,39 @@ void AlgorithmManager::register_algorithm(std::string name, sol::function initia
 
 }
 
-ranges::any_view<DungeonAlgorithm> AlgorithmManager::get_algorithms() {
-    return algorithms;
+ranges::any_view<DungeonAlgorithm*, ranges::category::random_access | ranges::category::sized> AlgorithmManager::get_algorithms() {
+    auto view = algorithms | ranges::view::transform([](auto& algo) {
+        return &algo;
+    });
+    return view;
+}
+
+void AlgorithmManager::load_algorithm(DungeonAlgorithm *algorithm, int w, int h) {
+    algorithm_done = false;
+    ticks = 0;
+    loaded_algorithm = algorithm;
+    auto init_result = loaded_algorithm->initialize(w, h);
+    if(!init_result.valid()) {
+        sol::error err = init_result;
+        Logger::log(LogLevel::ERROR, fmt::format("error while initializing lua: {}", err.what()));
+    }
+}
+
+void AlgorithmManager::tick_algorithm() {
+    if(this->loaded_algorithm == nullptr || algorithm_done) {
+        return;
+    }
+    if(ticks >= this->loaded_algorithm->frames_per_update) {
+        ticks = 0;
+        auto update_result = this->loaded_algorithm->update();
+        if(update_result.valid()) {
+            algorithm_done = update_result;
+        }
+        else {
+            algorithm_done = true;
+            sol::error err = update_result;
+            Logger::log(LogLevel::ERROR, fmt::format("An error occurred while running update: {}", err.what()));
+        }
+    }
+    ticks++;
 }

src/game/algorithmmanager.hpp

@@ -8,8 +8,8 @@
 #include <range/v3/view.hpp>
 struct DungeonAlgorithm {
     unsigned int frames_per_update=1;
-    sol::function update;
-    sol::function initialize;
+    sol::protected_function update;
+    sol::protected_function initialize;
     std::string name;
 };
 
@@ -17,17 +17,15 @@ class AlgorithmManager {
 private:
     std::vector<DungeonAlgorithm> algorithms;
     unsigned int target_fps=1;
+    unsigned int ticks=0;
+    DungeonAlgorithm* loaded_algorithm = nullptr;
+    bool algorithm_done = false;
 public:
     void register_algorithm(std::string name, sol::function initialize, sol::function update, unsigned int updates_per_second);
-
-    void setTargetFps(unsigned int targetFps) {
-        target_fps = targetFps;
-    }
-
-    ranges::any_view<DungeonAlgorithm> get_algorithms();
-
+    ranges::any_view<DungeonAlgorithm*, ranges::category::random_access | ranges::category::sized> get_algorithms();
+    void load_algorithm(DungeonAlgorithm* algorithm, int w, int h);
+    void tick_algorithm();
     explicit AlgorithmManager(unsigned int targetFps) : target_fps(targetFps) {}
-
     AlgorithmManager() = default;
 };
 

src/game/tilemap.cpp

@@ -4,12 +4,16 @@
 
 #include "tilemap.hpp"
 #include "../engine/utility/point.hpp"
+#include "../engine/modules/logger.hpp"
+#include <fmt/format.h>
 
 void TileMap::draw_floor(int x, int y) {
+    Logger::log(LogLevel::DEBUG, fmt::format("Drawing floor at x: {} y: {}", x, y));
     grid.insert(x, y, floor_tile);
 }
 
 void TileMap::draw_wall(int x, int y) {
+    Logger::log(LogLevel::DEBUG, fmt::format("Drawing wall at x: {} y: {}", x, y));
     grid.insert(x, y, wall_tile);
 }
 
@@ -18,6 +22,7 @@ char TileMap::get_tile(int x, int y) {
 }
 
 void TileMap::fill(bool wall) {
+    Logger::log(LogLevel::DEBUG, fmt::format("Running fill with wall: {}", wall));
     for(Point p : grid.get_range()) {
         if(wall) {
             draw_wall(p.x, p.y);

src/game/visualizer.cpp

@@ -2,6 +2,7 @@
 // Created by m on 12/3/21.
 //
 
+#include <filesystem>
 #include "visualizer.hpp"
 #include "tilemap.hpp"
 
@@ -9,6 +10,7 @@ bool Visualizer::update(InputResult input) {
     if(input.keycode == KEY_ESCAPE) {
         return true;
     }
+    this->algorithm_manager.tick_algorithm();
     switch(input.keycode) {
         case KEY_RIGHT: x += 1; break;
         case KEY_LEFT: x -= 1; break;
@@ -16,6 +18,12 @@ bool Visualizer::update(InputResult input) {
         case KEY_DOWN: y += 1; break;
         default: break;
     }
+    if(input.keycode >= InputProcessorKeycode::KEY_1 && input.keycode <= InputProcessorKeycode::KEY_9) {
+        if(this->keycode_to_algorithm.contains(input.keycode)) {
+            auto algorithm = this->keycode_to_algorithm[input.keycode];
+            this->algorithm_manager.load_algorithm(algorithm, this->map_size_w, this->map_size_h);
+        }
+    }
 
     this->x = std::clamp(this->x, 0, (int)this->tile_map.get_width()-1);
     this->y = std::clamp(this->y, 0, (int)this->tile_map.get_height()-1);
@@ -63,6 +71,7 @@ void Visualizer::initialize(GameInitArgs args) {
     this->camera = Camera(Point{x,y}, tilesx, tilesy, tile_map.get_width(), tile_map.get_height());
     this->algorithm_manager = AlgorithmManager(args.target_fps);
     this->initialize_context();
+    this->load_algorithms();
     Logger::log(LogLevel::DEBUG, "Game initialization finished");
 }
 
@@ -86,6 +95,34 @@ void Visualizer::initialize_context() {
 
     auto algo_manager_lua = lua->new_usertype<AlgorithmManager>("AlgorithmManager", sol::no_constructor);
     algo_manager_lua["register_algorithm"] = &AlgorithmManager::register_algorithm;
+
+    auto game_state_lua = lua->new_usertype<Visualizer>("Visualizer", sol::no_constructor);
+    game_state_lua.set("algorithm_manager", sol::readonly(&Visualizer::algorithm_manager));
+    game_state_lua.set("map", &Visualizer::tile_map);
+
+    lua->set("visualizer", this);
+}
+
+void Visualizer::load_algorithms() {
+    auto lua = lua_context_manager.get_default_context();
+    const std::string algorithms_directory = "scripts/algorithms";
+
+    for(const auto& file : std::filesystem::directory_iterator(algorithms_directory)) {
+        lua->script_file(file.path());
+    }
+    Logger::log(LogLevel::DEBUG, "finished loading lua files");
+    auto algorithms = this->algorithm_manager.get_algorithms();
+    auto algorithm_count = algorithms.size();
+    Logger::log(LogLevel::DEBUG, fmt::format("algorithms: {}", algorithm_count));
+
+    for(int code = InputProcessorKeycode::KEY_1;code < InputProcessorKeycode::KEY_9;code++) {
+        auto index = code-InputProcessorKeycode::KEY_1;
+        if(algorithms.size() <= index) {
+            break;
+        }
+        auto algo = algorithms[index];
+        this->keycode_to_algorithm[(InputProcessorKeycode)code] = algo;
+    }
 }
 
 Visualizer::~Visualizer() = default;

src/game/visualizer.hpp

@@ -38,8 +38,9 @@ private:
     int window_height = 0;
     TileMap tile_map = TileMap(0, 0, DEFAULT_WALL_CHAR[0], DEFAULT_FLOOR_CHAR[0]);
     Camera camera = Camera();
-    LuaContextManager lua_context_manager = LuaContextManager();
+    LuaContextManager lua_context_manager;
     AlgorithmManager algorithm_manager;
+    std::unordered_map<InputProcessorKeycode, DungeonAlgorithm*> keycode_to_algorithm;
 
     int x = 0;
     int y=0;
@@ -54,6 +55,7 @@ private:
 
     void initialize_map(int width, int height);
     void initialize_context();
+    void load_algorithms();
 
 };