From 20accd9724d715bca1eb4ffd18689ab3f7972123 Mon Sep 17 00:00:00 2001
From: geneotech <patryk.czachurski@gmail.com>
Date: Thu, 11 Apr 2024 21:36:34 +0200
Subject: [PATCH] Add and build WebRTC submodule on native

---
 .gitmodules                        |  3 +++
 CMakeLists.txt                     | 33 +++++++++++++++++++++++++++++-
 docs/pages/todo/brainstorm_now.md  |  3 +++
 src/3rdparty/libdatachannel        |  1 +
 src/augs/network/network_types.cpp | 19 +++++++++++++++++
 src/work.cpp                       |  4 ++++
 6 files changed, 62 insertions(+), 1 deletion(-)
 create mode 160000 src/3rdparty/libdatachannel

diff --git a/.gitmodules b/.gitmodules
index 718ee6481..ccfe77dba 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -31,3 +31,6 @@
 [submodule "src/3rdparty/rapidjson"]
 	path = src/3rdparty/rapidjson
 	url = https://github.com/Tencent/rapidjson
+[submodule "src/3rdparty/libdatachannel"]
+	path = src/3rdparty/libdatachannel
+	url = https://github.com/paullouisageneau/libdatachannel.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e7d870de..b1b60d9af 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -191,7 +191,8 @@ endif()
 
 option(BUILD_OPENAL "Build OpenAL Soft." ${DEFAULT_OPT})
 option(BUILD_OPENGL "Build OpenGL-related code." ${DEFAULT_OPT})
-option(BUILD_NETWORKING "Build the networking backend." ${DEFAULT_NET_OPT})
+option(BUILD_NETWORKING "Build networking." ${DEFAULT_NET_OPT})
+option(BUILD_WEBRTC "Build WebRTC for client and server. This will enable networking on the Web and cross-play between web and native clients." ${DEFAULT_NET_OPT})
 option(BUILD_OPENSSL "Build SSL support. Required for secure automatic application updates." ${DEFAULT_NET_OPT})
 option(BUILD_FREETYPE "Build FreeType library responsible for loading fonts." ${DEFAULT_OPT})
 option(BUILD_WINDOW_FRAMEWORK "Build code specific to a given platfom, e.g. window management done by WinAPI." ${DEFAULT_OPT})
@@ -245,6 +246,10 @@ else()
 	message("Building without debugger setup.")
 endif()
 
+if (NOT BUILD_NETWORKING)
+	set(BUILD_WEBRTC OFF)
+endif()
+
 if (BUILD_FOR_WEB OR HYPERSOMNIA_BARE)
 	# Slowly enabling one by one
 	set(BUILD_FREETYPE ON) 
@@ -1717,6 +1722,10 @@ if(BUILD_NETWORKING)
 	add_definitions(-DBUILD_NETWORKING=1)
 endif()
 
+if(BUILD_WEBRTC) 
+	add_definitions(-DBUILD_WEBRTC=1)
+endif()
+
 if(BUILD_FREETYPE) 
 	add_definitions(-DBUILD_FREETYPE=1)
 endif()
@@ -1963,6 +1972,28 @@ if(BUILD_WINDOW_FRAMEWORK)
 	endif()
 endif()
 
+if(BUILD_WEBRTC)
+	set(USE_GNUTLS OFF CACHE BOOL "" FORCE)
+	set(USE_MBEDTLS OFF CACHE BOOL "" FORCE)
+
+	set(NO_MEDIA ON CACHE BOOL "" FORCE)
+	set(NO_WEBSOCKET ON CACHE BOOL "" FORCE)
+	set(NO_EXAMPLES ON CACHE BOOL "" FORCE)
+	set(NO_TESTS ON CACHE BOOL "" FORCE)
+
+	if(BUILD_FOR_WEB)
+		add_subdirectory("${PROJECT_SOURCE_DIR}/src/3rdparty/datachannel-wasm" EXCLUDE_FROM_ALL)
+		list(APPEND HYPERSOMNIA_LIBS datachannel-wasm)
+	else()
+		add_subdirectory("${PROJECT_SOURCE_DIR}/src/3rdparty/libdatachannel" EXCLUDE_FROM_ALL)
+
+		# Would otherwise give error on src/3rdparty/libdatachannel/src/rtp.cpp
+		target_compile_options(datachannel-static PRIVATE -Wno-cast-align)
+
+		list(APPEND HYPERSOMNIA_LIBS datachannel-static)
+	endif()	
+endif()
+
 if(BUILD_OPENAL AND NOT BUILD_FOR_WEB)
 	list(APPEND HYPERSOMNIA_LIBS OpenAL)
 endif()
diff --git a/docs/pages/todo/brainstorm_now.md b/docs/pages/todo/brainstorm_now.md
index 9a843e8de..696a5a48e 100644
--- a/docs/pages/todo/brainstorm_now.md
+++ b/docs/pages/todo/brainstorm_now.md
@@ -6,6 +6,9 @@ permalink: brainstorm_now
 summary: That which we are brainstorming at the moment.
 ---
 
+- fix spawn prediction on connect to prevent the unpleasant glitch
+    - might just have to make it predictable instead of dependent on cosmos step?
+
 - "download native client" in the right top
 
 - clicking outside should close buy menu too
diff --git a/src/3rdparty/libdatachannel b/src/3rdparty/libdatachannel
new file mode 160000
index 000000000..fbd8f23d6
--- /dev/null
+++ b/src/3rdparty/libdatachannel
@@ -0,0 +1 @@
+Subproject commit fbd8f23d6af2cc3cd3b8bbc5154d3bbbbd0f01b1
diff --git a/src/augs/network/network_types.cpp b/src/augs/network/network_types.cpp
index f50f7eb6c..a25293366 100644
--- a/src/augs/network/network_types.cpp
+++ b/src/augs/network/network_types.cpp
@@ -8,6 +8,10 @@
 #include <cstdio>
 #include <stdarg.h> 
 
+#if BUILD_WEBRTC
+#include "rtc/rtc.hpp"
+#endif
+
 bool InitializeYojimbo();
 void ShutdownYojimbo();
 
@@ -25,6 +29,12 @@ LOG_NOFORMAT(Buffer);  // finaly print the text
 return 0;
 }
 
+#if BUILD_WEBRTC
+void rtc_log_callback(rtc::LogLevel, std::string message) {
+	LOG_NOFORMAT(message);
+}
+#endif
+
 namespace augs {
 	namespace network {
 		void enable_detailed_logs(const bool flag) {
@@ -38,11 +48,20 @@ namespace augs {
 			yojimbo_log_level(YOJIMBO_LOG_LEVEL_INFO);
 			yojimbo_set_printf_function(custom_print);
 			yojimbo_set_assert_function(log_ensure);
+
+#if BUILD_WEBRTC
+			rtc::InitLogger(rtc::LogLevel::Info, rtc_log_callback);
+			rtc::Preload();
+#endif
+
 			return result;
 		}
 
 		bool deinit() {
 			LOG("Shutting down the network library.");
+#if BUILD_WEBRTC
+			rtc::Cleanup();
+#endif
 			ShutdownYojimbo();
 			return true;
 		}
diff --git a/src/work.cpp b/src/work.cpp
index 1f917dbef..6c608e10e 100644
--- a/src/work.cpp
+++ b/src/work.cpp
@@ -163,6 +163,10 @@
 #include "application/setups/editor/packaged_official_content.h"
 #include "augs/string/parse_url.h"
 
+#if BUILD_WEBRTC
+#include "rtc/rtc.hpp"
+#endif
+
 #include "work_result.h"
 
 namespace augs {