From 4da61fdd465bcf6f1bec9e1de74a0a406b84994f Mon Sep 17 00:00:00 2001
From: roby2014 <robyawyx@gmail.com>
Date: Sat, 14 Oct 2023 12:49:54 +0100
Subject: [PATCH] feat(tools): add toggleable debug camera

---
 .../engine/tools/debug_camera/plugin.cpp      | 49 +++++++++++++++++--
 tools/tesseratos/src/main.cpp                 |  3 ++
 2 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/engine/src/cubos/engine/tools/debug_camera/plugin.cpp b/engine/src/cubos/engine/tools/debug_camera/plugin.cpp
index 2f53f0516d..73a9c99d60 100644
--- a/engine/src/cubos/engine/tools/debug_camera/plugin.cpp
+++ b/engine/src/cubos/engine/tools/debug_camera/plugin.cpp
@@ -1,22 +1,63 @@
 #include <imgui.h>
 
+#include <cubos/engine/imgui/plugin.hpp>
+#include <cubos/engine/renderer/environment.hpp>
+#include <cubos/engine/renderer/plugin.hpp>
+#include <cubos/engine/renderer/point_light.hpp>
 #include <cubos/engine/tools/debug_camera/plugin.hpp>
+#include <cubos/engine/transform/plugin.hpp>
 
+using cubos::core::ecs::Commands;
+using cubos::core::ecs::Entity;
+using cubos::core::ecs::Read;
 using cubos::core::ecs::Write;
 
 using namespace cubos::engine;
 
-static void inspector(Write<Settings> settings)
+struct DebugCameraInfo
+{
+    Entity copy[4]; // copy old camera entities to re-apply them in the next camera change
+    Entity ent;     // debug camera entity
+};
+
+static void createDebugCameraSystem(Commands commands, Write<DebugCameraInfo> debugCamera)
+{
+    debugCamera->ent = commands.create().add(Camera{}).add(Position{{}}).entity();
+}
+
+static void changeToDebugCameraSystem(Write<ActiveCameras> camera, Write<DebugCameraInfo> debugCamera)
 {
     ImGui::Begin("Debug Camera");
 
-    printf("debug camera");
+    ImGui::Text("Current camera: %s", debugCamera->ent == camera->entities[0] ? "Debug" : "Game");
+    ImGui::Text("Key to change: F12");
+
+    if (ImGui::Button("Change camera") || ImGui::IsKeyPressed(ImGuiKey_F12))
+    {
+        CUBOS_DEBUG("Changed camera ...");
+        if (debugCamera->ent == camera->entities[0])
+        {
+            std::copy(std::begin(debugCamera->copy), std::end(debugCamera->copy), camera->entities);
+        }
+        else
+        {
+            std::copy(std::begin(camera->entities), std::end(camera->entities), debugCamera->copy);
+            camera->entities[0] = debugCamera->ent;
+            camera->entities[1] = Entity();
+            camera->entities[2] = Entity();
+            camera->entities[3] = Entity();
+        }
+    }
 
     ImGui::End();
 }
 
 void cubos::engine::tools::debugCameraPlugin(Cubos& cubos)
 {
-    // cubos.addPlugin(imguiPlugin);
-    cubos.system(inspector).tagged("cubos.imgui");
+    cubos.addPlugin(imguiPlugin);
+
+    cubos.startupSystem(createDebugCameraSystem);
+    cubos.system(changeToDebugCameraSystem).tagged("cubos.imgui");
+
+    cubos.addResource<DebugCameraInfo>();
 }
diff --git a/tools/tesseratos/src/main.cpp b/tools/tesseratos/src/main.cpp
index b1fd95c70f..c84b49a796 100644
--- a/tools/tesseratos/src/main.cpp
+++ b/tools/tesseratos/src/main.cpp
@@ -1,12 +1,14 @@
 #include <cubos/engine/renderer/plugin.hpp>
 #include <cubos/engine/settings/settings.hpp>
 #include <cubos/engine/tools/asset_explorer/plugin.hpp>
+#include <cubos/engine/tools/debug_camera/plugin.hpp>
 #include <cubos/engine/tools/entity_inspector/plugin.hpp>
 #include <cubos/engine/tools/scene_editor/plugin.hpp>
 #include <cubos/engine/tools/settings_inspector/plugin.hpp>
 #include <cubos/engine/tools/world_inspector/plugin.hpp>
 #include <cubos/engine/transform/plugin.hpp>
 
+
 using cubos::core::ecs::Commands;
 using cubos::core::ecs::Write;
 
@@ -35,6 +37,7 @@ int main(int argc, char** argv)
     cubos.addPlugin(tools::entityInspectorPlugin);
     cubos.addPlugin(tools::worldInspectorPlugin);
     cubos.addPlugin(tools::assetExplorerPlugin);
+    cubos.addPlugin(tools::debugCameraPlugin);
 
     cubos.startupSystem(mockCamera).tagged("setup");
     cubos.startupSystem(mockSettings).tagged("setup");