* Netplay Stuff
## PROTOCOL FALLBACK
In order to support older clients a protocol fallback system was introduced.
The host will no longer send its header automatically after a TCP connection is established, instead, it awaits for the client to send his before determining which protocol this connection is going to operate on.
Netplay has now two protocols, a low protocol and a high protocol; the low protocol is the minimum protocol it supports, while the high protocol is the highest protocol it can operate on.
To fully support older clients, a hack was necessary: sending the high protocol in the unused client's header salt field, while keeping the protocol field to the low protocol. Without this hack we would only be able to support older clients if a newer client was the host.
Any future system can make use of this system by checking connection->netplay_protocol, which is available for both the client and host.
## NETPLAY CHAT
Starting with protocol 6, netplay chat is available through the new NETPLAY_CMD_PLAYER_CHAT command.
Limitations of the command code, which causes a disconnection on unknown commands, makes this system not possible on protocol 5.
Protocol 5 connections can neither send nor receive chat, but other netplay operations are unaffected.
Clients send chat as a string to the server, and it's the server's sole responsability to relay chat messages.
As of now, sending chat uses RetroArch's input menu, while the display of on-screen chat uses a widget overlay and RetroArch's notifications as a fallback.
If a new overlay and/or input system is desired, no backwards compatibility changes need to be made.
Only clients in playing mode (as opposed to spectating mode) can send and receive chat.
## SETTINGS SHARING
Some settings are better used when both host and clients share the same configuration.
As of protocol 6, the following settings will be shared from host to clients (without altering a client's configuration file): input latency frames and allow pausing.
## NETPLAY TUNNEL/MITM
With the current MITM system being defunct (at least as of 1.9.X), a new system was in order to solve most if not all of the problems with the current system.
This new system uses a tunneling approach, which is similar to most VPN and tunneling services around.
Tunnel commands:
RATS[unique id] (RetroArch Tunnel Session) - 16 bytes -> When this command is sent with a zeroed unique id, the tunnel server interprets this as a netplay host wanting to create a new session, in this case, the same command is returned to the host, but now with its unique session id. When a client needs to connect to a host, this command is sent with the unique session id of the host, causing the tunnel server to send a RATL command to the host.
RATL[unique id] (RetroArch Tunnel Link) - 16 bytes -> The tunnel server sends this command to the host when a client wants to connect to the host. Once the host receives this command, it establishes a new connection to the tunnel server, sending this command together with the client's unique id through this new connection, causing the tunnel server to link this connection to the connection of the client.
RATP (RetroArch Tunnel Ping) - 4 bytes -> The tunnel server sends this command to verify that the host, whom the session belongs to, is still around. The host replies with the same command. A session is closed if the tunnel server can not verify that the host is alive.
Operations:
Host -> Instead of listening and accepting connections, it connects to the tunnel server, requests a new session and then monitor this connection for new linking requests. Once a request is received, it establishes a new connection to the tunnel server for linking with a client. The tunnel server's address and port are obtained by querying the lobby server. The host will publish its session id together with the rest of its info to the lobby server.
Client -> It connects to the tunnel server and then sends the session id of the host it wants to connect to. A host's session id is obtained from the json data sent by the lobby server.
Improvements (from current MITM system):
No longer a risk of TCP port exhaustion; we only use one port now at the tunnel server.
Very little cpu usage. About 95% net I/O bound now.
Future backwards compatible with any and all changes to netplay as it no longer runs any netplay logic at MITM servers.
No longer operates the host in client mode, which was a source of many of the current problems.
Cleaner and more maintainable system and code.
Notable functions:
netplay_mitm_query -> Grabs the tunnel's address and port from the lobby server.
init_tcp_socket -> Handles the creation and operation mode of the TCP socket based on whether it's host, host+MITM or client.
handle_mitm_connection -> Creates and completes linking connections and replies to ping commands (only 1 of each per call to not affect performance).
## MISC
Ping Limiter: If a client's estimated latency to the server is higher than this value, connection will be dropped just before finishing the netplay handshake.
Ping Counter: A ping counter (similar to the FPS one) can be shown in the bottom right corner of the screen, if you are connected to a host.
LAN Discovery: Refactored and moved to its own "Refresh Netplay LAN List" button.
## FIXES
Many minor fixes to the current netplay implementation are also included.
* Remove NETPLAY_TEST_BUILD
* Added setting to allow/disallow players other than the host from pausing the game.
* Added a sublabel for netplay max connections.
* Fixed port override macro from not being set immediately after the port setting.
* Fixed memory leaks.
* Add HDR support
* Attempt to fix Mingw build and Metal builds
* (D3D12) Fix relative header includes
* Add missing hdr_sm5.hlsl.h
* (d3d12_common.c) Some C89 build fixes
* Fix MSVC build
* - Attempt to fix build on mingw/msys unix with dirty hack
- Fix shader compilation of hdr_sm5.hlsl.h on MSVC/Visual Studio -
the define was seen as an error and was causing the first pipeline
to error out
- Make sure we manually set handle of backBuffer to NULL
* Moving the release of the texture above the freeing of desc.srv_heap
and desc.rtv_heap solves the hard crashes on teardown/setup in RA -
it was crashing hard in d3d12_release_texture before
* Add HAVE_D3D12_HDR ifdef - needs to be disabled for WinRT for now
because of several things that are Windows desktop-specific right now
(GetWindowRect)
* Add dirty GUID hack - should work for both mingw/msys on Windows/Linux
as well as MSVC/Visual Studio (hopefully)
* Change HAVE_D3D12_HDR to HAVE_DXGI_HDR
* Move away from camelcase named variables
* Fix RARCH_ERR logs - they need a newline at the end
* d3d12_check_display_hdr_support - make it return a bool on return
and set d3d12->hdr.support and d3d12->hdr.enable outside of the
function
* (DXGI) Remove D3D12 dependencies from dxgi_check_display_hdr_support and
move it to dxgi_common.c instead
* (DXGI) move d3d12_swapchain_color_space over to dxgi_common.c and
rename it dxgi_swapchain_color_space
* (DXGI) move d3d12_set_hdr_metadata to dxgi_common.c and
rename it dxgi_set_hdr_metadata
* (DXGI) dxgi_check_display_hdr_support - better error handling?
* Fix typo
* Remove video_force_resolution
* (D3D12) Address TODO/FIXME
* (D3D12) Backport
c1b6c0bff2
- Fixed resource transition for present when HDR is off
Fixed cel shader displaying all black as blending was enabled when the hdr shader was being applied - turned off blending during this shader
* Move d3d12_hdr_uniform_t to dxgi_common.h and
rename it dxgi_hdr_uniform_t
* (D3D11) Add HDR support
* Add TODO/FIXME notes
* Cache hdr_enable in video_frame_info_t
* Update comment
