[Add] Implement system boot sequence screen.

assets/boot_messages.txt

@@ -0,0 +1,24 @@
+[  0.000000] Bettola version 6.1.0-bettola (dev@bettola)
+[  0.000000] Command line: BOOT_IMAGE=/vmbettola-6.1.0 ro quiet
+[  0.134589] ACPI: PM-Timer IO Port: 0x808
+[  0.345821] pci 0000:00:02.0: vgaarb: setting as boot VGA device
+[  0.345911] pci 0000:00:03.0: enp0s3: identified as [B77A:1337]
+[  0.582190] systemd[1]: Starting systemd-journald.service...
+[  0.621337] systemd-journald[218]: Journal started.
+[  1.123456] EXT4-fs (sda1): mounted filesystem with ordered data mode.
+[  1.567890] systemd[1]: Reached target Local File Systems.
+[  1.890123] systemd[1]: Starting systemd-logind.service...
+[  2.101122] systemd[1]: Starting NetworkManager.service...
+[  2.334455] NetworkManager[310]: <info>  [1678886400.123] NetworkManager (version 1.40.0) is
+starting...
+[  2.800100] enp0s3: Link is up at 1000 Mbps, full duplex.
+[  3.123456] systemd[1]: Reached target Network.
+[  3.500000] systemd[1]: Starting Bettola Daemon...
+[  3.600000] bettolad[420]: Initializing VFS...
+[  3.700000] bettolad[420]: Generating world...
+[  4.100000] bettolad[420]: World generation complete. Seed: 0xDEADBEEF
+[  4.200000] bettolad[420]: Listening on 0.0.0.0:1337
+[  4.500000] systemd[1]: Started Bettola Daemon.
+[  4.800000] systemd[1]: Reached target Multi-User System.
+[  5.000000] systemd[1]: Starting Graphical Interface.
+[  5.500000] bettolac-greeter: Starting display manager...

client/src/game_state.cpp

@@ -12,6 +12,7 @@
 #include "ui/desktop.h"
 #include "ui/ui_window.h"
 #include <ui/main_menu.h>
+#include <ui/boot_sequence.h>
 
 void GameState::_init_desktop(void) {
   _desktop = std::make_unique<Desktop>();
@@ -92,6 +93,15 @@ void GameState::update(void) {
       _main_menu.reset(); /* Free mem. */
 
       if(_current_screen == Screen::BOOTING) {
+        _boot_sequence = std::make_unique<BootSequence>();
+      }
+    }
+    break;
+  }
+  case Screen::BOOTING: {
+    if(!_boot_sequence) break; /* Shouldn't happen. */
+    if(_boot_sequence->is_finished()) {
+      /* Connect to server. */
       fprintf(stdout, "Starting in single-player mode...\n");
       std::thread server_thread(&GameState::_run_server, this);
       server_thread.detach();
@@ -100,16 +110,12 @@ void GameState::update(void) {
       if(!_network->connect("127.0.0.1", 1337)) {
         /* TODO: Handle connection failure. */
       }
-        /* TODO: transition to book screen. */
       _current_screen = Screen::DESKTOP;
       _init_desktop();
-      }
+      _boot_sequence.reset(); /* Free mem. */
     }
     break;
   }
-  case Screen::BOOTING:
-    /* TODO: */
-    break;
   case Screen::DESKTOP: {
     std::string server_msg;
       while(_network->poll_message(server_msg)) {
@@ -157,7 +163,9 @@ void GameState::render(ShapeRenderer* shape_renderer, TextRenderer* txt_renderer
     }
     break;
   case Screen::BOOTING:
-    /* TODO: */
+    if(_boot_sequence) {
+      _boot_sequence->render(txt_renderer, screen_height);
+    }
     break;
   case Screen::DESKTOP:
     if(_desktop) {

client/src/game_state.h

@@ -4,6 +4,7 @@
 
 class ClientNetwork;
 class Desktop;
+class BootSequence;
 class MainMenu;
 class ShapeRenderer;
 class TextRenderer;
@@ -30,6 +31,7 @@ public:
 private:
   std::unique_ptr<ClientNetwork> _network;
   std::unique_ptr<Desktop>       _desktop;
+  std::unique_ptr<BootSequence>  _boot_sequence;
   std::unique_ptr<MainMenu>      _main_menu;
   Screen                         _current_screen;
 

client/src/ui/boot_sequence.cpp

@@ -0,0 +1,54 @@
+#include <fstream>
+#include <string>
+#include <vector>
+#include <cstdio>
+#include "gfx/txt_renderer.h"
+
+#include "boot_sequence.h"
+#include <SDL3/SDL_timer.h>
+
+BootSequence::BootSequence(void) {
+  /* Load boot messages. */
+  std::ifstream boot_file("assets/boot_messages.txt");
+  if(!boot_file.is_open()) {
+    printf("ERROR: Failed to open assets/boot_messages.txt\n");
+    _messages.push_back("ERROR: boot_messages.txt not found.");
+  } else {
+    std::string line;
+    while(std::getline(boot_file, line)) {
+      if(!line.empty()) {
+        _messages.push_back(line);
+      }
+    }
+  }
+
+  /* Init timings. */
+  _start_time = SDL_GetTicks();
+  _line_interval_ms = 150; /* 150ms between each line. */
+  /* Total duration is time for all lines plus a 2-second pause at the end. */
+  _total_duration_ms = (_messages.size() * _line_interval_ms) + 2000;
+}
+
+BootSequence::~BootSequence(void) {}
+
+bool BootSequence::is_finished(void) {
+  return (SDL_GetTicks() - _start_time) >= _total_duration_ms;
+}
+
+void BootSequence::render(TextRenderer* txt_renderer, int screen_height) {
+  const Color text_color  = { 0.9f, 0.9f, 0.9f }; /* grey/white */
+  const float line_height = 18.0f;
+  const float padding     = 15.0f;
+
+  Uint32 elapsed_time = SDL_GetTicks() - _start_time;
+  int lines_to_show = elapsed_time / _line_interval_ms;
+
+  if(lines_to_show > _messages.size()) {
+    lines_to_show = _messages.size();
+  }
+
+  for(int i = 0; i < lines_to_show; ++i) {
+    float y_pos = (screen_height - padding) - (i * line_height);
+    txt_renderer->render_text(_messages[i].c_str(), padding, y_pos, 1.0f, text_color);
+  }
+}

client/src/ui/boot_sequence.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <vector>
+#include <string>
+#include <SDL3/SDL.h>
+
+#include "gfx/txt_renderer.h"
+
+class BootSequence {
+public:
+  BootSequence(void);
+  ~BootSequence(void);
+
+  bool is_finished(void);
+  void render(TextRenderer* txt_renderer, int screen_height);
+private:
+  std::vector<std::string> _messages;
+  Uint32 _start_time;
+  Uint32 _line_interval_ms;   /* Time for each line to appear. */
+  Uint32 _total_duration_ms;  /* Total time for the whole sequence. */
+};