From 015b4aac456e930e2c4248d8a77c4fc5a2fb3b83 Mon Sep 17 00:00:00 2001
From: "Zed A. Shaw" <zed.shaw@gmail.com>
Date: Tue, 27 Aug 2024 17:12:48 -0400
Subject: [PATCH] Basic sfml window going for the gui redesign.

---
 meson.build             |   6 ++-
 scripts/reset_build.ps1 |   2 +
 scripts/reset_build.sh  |   2 +
 sfmltest.cpp            | 102 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 111 insertions(+), 1 deletion(-)
 create mode 100644 sfmltest.cpp

diff --git a/meson.build b/meson.build
index d805901..e46c37a 100644
--- a/meson.build
+++ b/meson.build
@@ -21,11 +21,12 @@ ftxui_component = dependency('ftxui-component')
 catch2 = dependency('catch2-with-main')
 sfml = dependency('sfml')
 json = dependency('nlohmann_json')
+imgui = dependency('imgui-sfml')
 
 dependencies = [
   fmt, libgit2package_dep, efsw_dep,
   ftxui_screen, ftxui_dom, ftxui_component,
-  sfml, json
+  sfml, imgui, json
 ]
 
 executable('escape_turings_tarpit',
@@ -51,6 +52,9 @@ executable('audiotest', 'audiotest.cpp',
 executable('jsontest', 'jsontest.cpp',
   dependencies: dependencies)
 
+executable('sfmltest', 'sfmltest.cpp',
+  dependencies: dependencies)
+
 runtests = executable('runtests', [
   'game_engine.cpp',
   'tests/game_engine.cpp'],
diff --git a/scripts/reset_build.ps1 b/scripts/reset_build.ps1
index 3c7f3b5..8d7b4b0 100644
--- a/scripts/reset_build.ps1
+++ b/scripts/reset_build.ps1
@@ -16,6 +16,8 @@ meson wrap install flac
 meson wrap install freetype2
 meson wrap install openal-soft
 meson wrap install sfml
+meson wrap install imgui
+meson wrap install imgui-sfml
 meson wrap install nlohmann_json
 # $env:CC="clang"
 # $env:CXX="clang++"
diff --git a/scripts/reset_build.sh b/scripts/reset_build.sh
index 6a8814f..471b622 100644
--- a/scripts/reset_build.sh
+++ b/scripts/reset_build.sh
@@ -18,6 +18,8 @@ meson wrap install ogg
 meson wrap install flac
 meson wrap install freetype2
 meson wrap install openal-soft
+meson wrap install imgui
 meson wrap install sfml
+meson wrap install imgui-sfml
 meson wrap install nlohmann_json
 meson setup builddir
diff --git a/sfmltest.cpp b/sfmltest.cpp
new file mode 100644
index 0000000..e5852f9
--- /dev/null
+++ b/sfmltest.cpp
@@ -0,0 +1,102 @@
+#include "imgui.h"
+#include "imgui-SFML.h"
+#define _USE_MATH_DEFINES
+#include <math.h>
+#include <fmt/core.h>
+#include <SFML/Graphics/Sprite.hpp>
+#include <SFML/Graphics/Texture.hpp>
+#include <SFML/Graphics/RenderWindow.hpp>
+#include <SFML/System.hpp>
+#include <SFML/Audio.hpp>
+#include <SFML/Window/Event.hpp>
+
+constexpr int FPS=30;
+constexpr int X_DIM = 1920 / 2;
+constexpr int Y_DIM = 1080 / 2;
+
+void ImGui_setup(sf::RenderWindow &window) {
+  bool res = ImGui::SFML::Init(window);
+  fmt::println("IMGUI returned {}", res);
+}
+
+void ImGui_update(sf::RenderWindow &window, sf::Clock &deltaClock, sf::Time &tick) {
+  ImGui::SFML::Update(window, deltaClock.restart());
+  // ImGui::ShowDemoWindow();
+  ImGui::Begin("Clock");
+  sf::Vector2u size = window.getSize();
+  ImGui::SetWindowPos(ImVec2(size.x - 150, 0));
+  ImGui::SetWindowSize(ImVec2(150, 50));
+  std::string msg = fmt::format("Time: {}\n", tick.asSeconds());
+  ImGui::Button(msg.c_str());
+  ImGui::End();
+}
+
+void Window_update(sf::RenderWindow &window) {
+    window.clear();
+    ImGui::SFML::Render(window);
+    window.display();
+}
+
+void Handle_events(sf::RenderWindow &window) {
+  sf::Event event;
+
+  // is this a main event loop
+  while (window.pollEvent(event)) {
+    ImGui::SFML::ProcessEvent(window, event);
+
+    switch(event.type) {
+
+      case sf::Event::Closed:
+        fmt::print("Exiting...\n");
+        window.close();
+        break;
+      case sf::Event::KeyPressed:
+        if(sf::Keyboard::isKeyPressed(sf::Keyboard::Escape)) {
+          window.close();
+        }
+        break;
+      default:
+        // do nothing
+        break;
+    }
+  }
+}
+
+sf::Time Update_entities(sf::RenderWindow &window, sf::Clock &clock, sf::Clock &deltaClock, sf::Time &tick) {
+  sf::Vector2u winSize = window.getSize();
+  float timeStep = 1.0f / FPS;
+  sf::Time since = clock.getElapsedTime();
+  sf::Time nextTick = since - tick > sf::seconds(1) ? since : tick;
+
+  ImGui_update(window, deltaClock, tick);
+  Window_update(window);
+
+  return nextTick;
+}
+
+
+int main() {
+  fmt::print("Setting up a window for you...\n");
+
+  sf::ContextSettings settings;
+  settings.antialiasingLevel = 8;
+
+  sf::RenderWindow window(sf::VideoMode(X_DIM, Y_DIM), "Turing's Tarpit", sf::Style::None, settings);
+  window.setPosition({.x=0,.y=0});
+
+  window.setFramerateLimit(FPS);
+  window.setVerticalSyncEnabled(true);
+  ImGui_setup(window);
+
+  sf::Clock deltaClock;
+  sf::Clock clock;
+  sf::Time tick = clock.getElapsedTime();
+
+  while (window.isOpen()) {
+    Handle_events(window);
+    // preparing for refactoring this into a class or struct for everything
+    tick = Update_entities(window, clock, deltaClock, tick);
+  }
+
+  ImGui::SFML::Shutdown();
+}