From c2a09e48d05b4364dfebc5fb31e8a5dbf76cb255 Mon Sep 17 00:00:00 2001
From: Trevor Slocum <trevor@rocketnine.space>
Date: Fri, 22 Sep 2023 20:39:11 -0700
Subject: [PATCH] Add CLI parameter for running without graphics

Resolves #1547.
---
 libopenage/main.cpp       | 6 +++++-
 libopenage/main.h         | 2 ++
 openage/game/main.py      | 4 ++++
 openage/game/main_cpp.pyx | 3 +++
 openage/main/main.py      | 4 ++++
 openage/main/main_cpp.pyx | 3 +++
 6 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/libopenage/main.cpp b/libopenage/main.cpp
index 7c80689a25f..6e7aa0de510 100644
--- a/libopenage/main.cpp
+++ b/libopenage/main.cpp
@@ -25,8 +25,12 @@ int run_game(const main_arguments &args) {
 	auto cvar_manager = std::make_shared<cvar::CVarManager>(args.root_path["cfg"]);
 	cvar_manager->load_all();
 
-	// TODO: select run_mode by launch argument
+    // set engine run_mode
 	openage::engine::Engine::mode run_mode = openage::engine::Engine::mode::FULL;
+	if (args.headless) {
+	    run_mode = openage::engine::Engine::mode::HEADLESS;
+	}
+
 	openage::engine::Engine engine{run_mode, args.root_path, args.mods};
 
 	engine.loop();
diff --git a/libopenage/main.h b/libopenage/main.h
index 7eb33177116..36d7cae6926 100644
--- a/libopenage/main.h
+++ b/libopenage/main.h
@@ -27,12 +27,14 @@ namespace openage {
  *     Path root_path
  *     int32_t fps_limit
  *     bool gl_debug
+ *     bool headless
  *     vector[string] mods
  */
 struct main_arguments {
 	util::Path root_path;
 	int32_t fps_limit;
 	bool gl_debug;
+	bool headless;
 	std::vector<std::string> mods;
 };
 
diff --git a/openage/game/main.py b/openage/game/main.py
index d9dd9923be2..be658d50ab6 100644
--- a/openage/game/main.py
+++ b/openage/game/main.py
@@ -28,6 +28,10 @@ def init_subparser(cli: ArgumentParser) -> None:
         "--gl-debug", action='store_true',
         help="throw exceptions directly from the OpenGL calls")
 
+    cli.add_argument(
+        "--headless", action='store_true',
+        help="run without displaying graphics")
+
     cli.add_argument(
         "--modpacks", nargs="+", type=bytes,
         help="list of modpacks to load")
diff --git a/openage/game/main_cpp.pyx b/openage/game/main_cpp.pyx
index 76fe9c82268..d34b22bf5c9 100644
--- a/openage/game/main_cpp.pyx
+++ b/openage/game/main_cpp.pyx
@@ -32,6 +32,9 @@ def run_game(args, root_path):
         # opengl debugging
         args_cpp.gl_debug = args.gl_debug
 
+        # headless mode
+        args_cpp.headless = args.headless
+
         # run the game!
         with nogil:
             result = run_game_cpp(args_cpp)
diff --git a/openage/main/main.py b/openage/main/main.py
index 0340bc2a11d..e5036357950 100644
--- a/openage/main/main.py
+++ b/openage/main/main.py
@@ -24,6 +24,10 @@ def init_subparser(cli: ArgumentParser):
         "--gl-debug", action='store_true',
         help="throw exceptions directly from the OpenGL calls")
 
+    cli.add_argument(
+        "--headless", action='store_true',
+        help="run without displaying graphics")
+
     cli.add_argument(
         "--modpacks", nargs="+",
         help="list of modpacks to load")
diff --git a/openage/main/main_cpp.pyx b/openage/main/main_cpp.pyx
index a7970762cfd..dd64aa57541 100644
--- a/openage/main/main_cpp.pyx
+++ b/openage/main/main_cpp.pyx
@@ -35,6 +35,9 @@ def run_game(args, root_path):
         # opengl debugging
         args_cpp.gl_debug = args.gl_debug
 
+        # headless mode
+        args_cpp.headless = args.headless
+
         # mods
         if args.modpacks is not None:
             args_cpp.mods = args.modpacks