Can now pause, step, play, and restart the VM. Gross implementation but it's a start.

src/chip8.hpp

@@ -41,6 +41,8 @@ class Chip8 {
       0xF0, 0x80, 0xF0, 0x80, 0x80  // F
     };
     bool needs_render = true;
+    bool needs_restart = false;
+    bool paused = false;
 
     std::default_random_engine randGen;
     std::uniform_int_distribution<uint8_t> randByte;

src/control_panel.cpp

@@ -8,23 +8,38 @@ ControlPanel::ControlPanel() {
 void ControlPanel::init(sf::Vector2f size) {
   $gui.position(0, size.y, size.x, WINDOW_HEIGHT - size.y);
   $gui.layout(
-      "[pause  |*%(200, 400)code|_]"
-      "[step   |_|_]"
-      "[play   |_|_]"
-      "[restart|_|_]"
+      "[Pause  |*%(200, 400)code|_]"
+      "[Step   |_|_]"
+      "[Play   |_|_]"
+      "[Restart|_|_]"
       );
 
   for(auto& [name, cell] : $gui.cells()) {
     auto id = $gui.entity(name);
     $gui.set<guecs::Rectangle>(id, {});
     $gui.set<guecs::Text>(id, {guecs::to_wstring(name)});
-    if(name != "code") {
-      $gui.set<guecs::Clickable>(id, {[name](auto) {
-          fmt::println("CLICKED {}", name);
-      }});
-    }
   }
 
+  auto id = $gui.entity("Pause");
+  $gui.set<guecs::Clickable>(id, {[&](auto) {
+      $paused = true;
+  }});
+
+  id = $gui.entity("Step");
+  $gui.set<guecs::Clickable>(id, {[&](auto) {
+      $step = true;
+  }});
+
+  id = $gui.entity("Play");
+  $gui.set<guecs::Clickable>(id, {[&](auto) {
+      $paused = false;
+  }});
+
+  id = $gui.entity("Restart");
+  $gui.set<guecs::Clickable>(id, {[&](auto) {
+      $restart = true;
+  }});
+
   $gui.init();
 }
 
@@ -33,6 +48,20 @@ void ControlPanel::render(sf::RenderTarget& window) {
 }
 
 void ControlPanel::update(Chip8& vm) {
+  if($restart) {
+    vm.needs_restart = true;
+    $restart = false;
+    return;
+  }
+
+  vm.paused = $paused;
+
+  if($step && $paused) {
+    vm.Cycle();
+    vm.needs_render = true;
+  }
+
+  $step = false;
 }
 
 bool ControlPanel::mouse(float x, float y, guecs::Modifiers mods) {

src/control_panel.hpp

@@ -6,6 +6,9 @@
 
 struct ControlPanel {
   guecs::UI $gui;
+  bool $paused = false;
+  bool $step = false;
+  bool $restart = false;
 
   ControlPanel();
 

src/display.cpp

@@ -53,6 +53,7 @@ void Display::update(Chip8& vm) {
   handle_inputs(vm);
   $texture.update((uint8_t *)(vm.video), {64, 32}, {0,0});
   $status.update(vm);
+  $control.update(vm);
 }
 
 void Display::render() {

src/main.cpp

@@ -36,9 +36,11 @@ int main(int argc, char* argv[]) {
   Stats update_stats;
 
   while (display.active()) {
+    if(!chip8.paused) {
       auto t = cycle_stats.time_start();
       chip8.Cycle();
       cycle_stats.sample_time(t);
+    }
 
     if(chip8.needs_render) {
       auto ut = update_stats.time_start();
@@ -49,6 +51,12 @@ int main(int argc, char* argv[]) {
       display.render();
       render_stats.sample_time(rt);
     }
+
+    if(chip8.needs_restart) {
+      Chip8 new_chip8;
+      new_chip8.LoadROM(romFilename);
+      chip8 = new_chip8;
+    }
   }
 
   cycle_stats.dump("CYCLE TIMES");