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Files
maszyna/application/driveruilayer.cpp
Hirek193 c0dbf99f1a multiplayer: whoever drives a train runs it, and their ride is the smooth one
Until now the server ran the physics of everything and a client re-ran it from
the server's frame times, corrected a few times a second. That is the worst of
both: the client's own train never moved smoothly, its controls answered a
round trip late, and the two copies still sat metres apart between corrections.

Simulation authority now follows the train:

- the first person aboard a train runs its physics on their own machine, and
  what they produce is what the rest of the session is told about it. A train
  with nobody in it belongs to the host. Every peer works the owner out the
  same way, from the crew of its lowest numbered car, so nobody has to be told
- a peer never applies corrections to a train it runs itself. Its own physics
  is the authority on it, and overwriting that is precisely what made the
  owner's ride stutter
- a client publishes the state of its own trains upstream, ten times a second.
  The server takes it, filtered so a peer can only move the trains it is
  entitled to move, and passes it on to everybody else in its own stream
- so the picture is: your train is smooth for you and may stutter for the
  others; their trains may stutter for you and are smooth for them

Two things follow from it:

- commands for the train you run take effect the moment you press the key
  instead of after a trip to the server and back. They are still sent, so
  everybody else sees them, and the echo is dropped when it returns
- the client no longer replays the server's frame times out of a jitter buffer.
  It runs on its own clock, like the host does, and simply carries out the
  commands as they arrive. Playing back somebody else's frame times meant the
  world ran at the wrong speed whenever the two machines drew at different
  rates, and every buffered frame sat between the player and their controls

Also: the server only sends a frame when it has commands in it, or every tenth
one to carry the tick, instead of one per rendered frame.
2026-09-07 00:19:40 +00:00

293 lines
7.2 KiB
C++

/*
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
*/
#include "stdafx.h"
#include "application/driveruilayer.h"
#include "utilities/Globals.h"
#include "application/application.h"
#include "utilities/translation.h"
#include "simulation/simulation.h"
#include "vehicle/Train.h"
#include "model/AnimModel.h"
#include "rendering/renderer.h"
driver_ui::driver_ui()
{
clear_panels();
// bind the panels with ui object. maybe not the best place for this but, eh
add_external_panel(&m_aidpanel);
add_external_panel(&m_scenariopanel);
add_external_panel(&m_timetablepanel);
add_external_panel(&m_debugpanel);
if (Global.gui_showtranscripts)
add_external_panel(&m_transcriptspanel);
add_external_panel(&m_trainingcardpanel);
add_external_panel(&m_vehiclelist);
add_external_panel(&m_timepanel);
add_external_panel(&m_mappanel);
add_external_panel(&m_logpanel);
add_external_panel(&m_perfgraphpanel);
add_external_panel(&m_cameraviewpanel);
add_external_panel(&m_multiplayerlobby);
m_logpanel.is_open = false;
m_aidpanel.title = STR("Driving Aid");
m_scenariopanel.title = STR("Scenario");
m_scenariopanel.size_min = {435, 85};
m_scenariopanel.size_max = {Global.fb_size.x * 0.95f, Global.fb_size.y * 0.95};
m_timetablepanel.title = STR("%-*.*s Time: %d:%02d:%02d");
m_timetablepanel.size_min = {435, 70};
m_timetablepanel.size_max = {435, Global.fb_size.y * 0.95};
m_transcriptspanel.title = STR("Transcripts");
m_transcriptspanel.size_min = {435, 85};
m_transcriptspanel.size_max = {Global.fb_size.x * 0.95, Global.fb_size.y * 0.95};
m_multiplayerlobby.title = STR("Multiplayer lobby");
m_multiplayerlobby.size_min = {560, 320};
m_multiplayerlobby.size_max = {Global.fb_size.x * 0.95f, Global.fb_size.y * 0.95f};
if (Global.gui_defaultwindows)
{
m_aidpanel.is_open = true;
m_scenariopanel.is_open = true;
}
if (Global.gui_trainingdefault)
{
m_mappanel.is_open = true;
m_trainingcardpanel.is_open = true;
m_vehiclelist.is_open = true;
}
}
void driver_ui::render_menu_contents()
{
ui_layer::render_menu_contents();
if (ImGui::BeginMenu(STR_C("Mode windows")))
{
ImGui::MenuItem(m_aidpanel.title.c_str(), "F1", &m_aidpanel.is_open);
ImGui::MenuItem(m_scenariopanel.title.c_str(), "F1", &m_aidpanel.is_open);
ImGui::MenuItem(STR_C("Timetable"), "F2", &m_timetablepanel.is_open);
ImGui::MenuItem(m_debugpanel.name().c_str(), "F12", &m_debugpanel.is_open);
ImGui::MenuItem(m_mappanel.name().c_str(), "Tab", &m_mappanel.is_open);
ImGui::MenuItem(m_vehiclelist.name().c_str(), nullptr, &m_vehiclelist.is_open);
ImGui::MenuItem(m_trainingcardpanel.name().c_str(), nullptr, &m_trainingcardpanel.is_open);
ImGui::MenuItem(m_cameraviewpanel.name().c_str(), nullptr, &m_cameraviewpanel.is_open);
if (DebugModeFlag)
ImGui::MenuItem(m_perfgraphpanel.name().c_str(), nullptr, &m_perfgraphpanel.is_open);
if (ImGui::MenuItem(m_timepanel.name().c_str()))
m_timepanel.open();
if (Application.is_server() || Application.is_client())
ImGui::MenuItem(m_multiplayerlobby.name().c_str(), nullptr, &m_multiplayerlobby.is_open);
ImGui::EndMenu();
}
}
void driver_ui::show_multiplayer_lobby(bool const Show)
{
m_multiplayerlobby.is_open = Show;
}
void driver_ui::showDebugUI()
{
m_debugpanel.is_open = !m_debugpanel.is_open;
}
// potentially processes provided input key. returns: true if key was processed, false otherwise
bool driver_ui::on_key(int const Key, int const Action)
{
if (ui_layer::on_key(Key, Action))
return true;
switch (Key)
{
case GLFW_KEY_TAB:
case GLFW_KEY_F1:
case GLFW_KEY_F2:
case GLFW_KEY_F3:
case GLFW_KEY_F10:
case GLFW_KEY_F12:
{ // ui mode selectors
if (true == Global.ctrlState || true == Global.shiftState)
{
// only react to keys without modifiers
return false;
}
if (Action != GLFW_PRESS)
{
return true;
} // recognized, but ignored
}
default:
{ // everything else
break;
}
}
switch (Key)
{
case GLFW_KEY_TAB:
{
m_mappanel.is_open = !m_mappanel.is_open;
return true;
}
case GLFW_KEY_F1:
{
// basic consist info
auto state = m_aidpanel.is_open == false ? 0 : m_aidpanel.is_expanded == false ? 1 : 2;
state = clamp_circular(++state, 3);
m_aidpanel.is_open = state > 0;
m_aidpanel.is_expanded = state > 1;
return true;
}
case GLFW_KEY_F2:
{
// timetable
auto state = m_timetablepanel.is_open == false ? 0 : m_timetablepanel.is_expanded == false ? 1 : 2;
state = clamp_circular(++state, 3);
m_timetablepanel.is_open = state > 0;
m_timetablepanel.is_expanded = state > 1;
return true;
}
case GLFW_KEY_F3:
{
// debug panel
m_scenariopanel.is_open = !m_scenariopanel.is_open;
return true;
}
case GLFW_KEY_F12:
{
// debug panel
if (Global.shiftState)
{
m_debugpanel.is_open = !m_debugpanel.is_open;
return true;
}
}
default:
{
break;
}
}
return false;
}
// potentially processes provided mouse movement. returns: true if the input was processed, false otherwise
bool driver_ui::on_cursor_pos(double const Horizontal, double const Vertical)
{
// intercept mouse movement when the pause window is on
return m_paused;
}
// potentially processes provided mouse button. returns: true if the input was processed, false otherwise
bool driver_ui::on_mouse_button(int const Button, int const Action)
{
// intercept mouse movement when the pause window is on
return m_paused;
}
// updates state of UI elements
void driver_ui::update()
{
auto const pausemask{1 | 2};
auto ispaused{false == DebugModeFlag && (Global.iPause & pausemask) != 0};
if (ispaused != m_paused && false == Global.ControlPicking)
{
set_cursor(ispaused);
}
m_paused = ispaused;
ui_layer::update();
}
void driver_ui::set_cursor(bool const Visible)
{
if (Visible)
{
Application.set_cursor(GLFW_CURSOR_NORMAL);
Application.set_cursor_pos(Global.window_size.x / 2, Global.window_size.y / 2);
}
else
{
Application.set_cursor(GLFW_CURSOR_DISABLED);
Application.set_cursor_pos(0, 0);
}
}
// render() subclass details
void driver_ui::render_()
{
const std::string *rec_name = m_trainingcardpanel.is_recording();
if (rec_name && m_cameraviewpanel.set_state(true))
{
m_cameraviewpanel.rec_name = *rec_name;
m_cameraviewpanel.is_open = true;
}
else if (!rec_name)
m_cameraviewpanel.set_state(false);
// pause/quit modal
auto const popupheader{STR_C("Simulation Paused")};
ImGui::SetNextWindowSize(ImVec2(-1, -1));
if (ImGui::BeginPopupModal(popupheader, nullptr, 0))
{
if (ImGui::Button(STR_C("Resume"), ImVec2(150, 0)) || ImGui::IsKeyReleased(ImGui::GetKeyIndex(ImGuiKey_Escape)))
{
m_relay.post(user_command::pausetoggle, 0.0, 0.0, GLFW_RELEASE, 0);
}
if (ImGui::Button(STR_C("Quit"), ImVec2(150, 0)))
{
Application.queue_quit(false);
}
if (!m_paused)
ImGui::CloseCurrentPopup();
ImGui::EndPopup();
}
else if (m_paused)
{
ImGui::OpenPopup(popupheader);
}
if (Global.network_position_error > 0.5f)
{
ImGui::SetNextWindowSize(ImVec2(-1, -1));
if (ImGui::Begin("network", nullptr, ImGuiWindowFlags_NoCollapse))
ImGui::Text("%.1f m behind the server (tick %llu)", Global.network_position_error, (unsigned long long)Global.simulation_tick);
ImGui::End();
}
}