NextClient

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NextClient

NextClient is a modification for Counter-Strike 1.6 aimed at introducing new functionality for both players and developers of server modifications on amxmodx. NextClient has integrated some features from csldr.

Please note that the official version of NextClient does not include an emulator. Next21 team is not developing a Steam emulator. You still need to have Steam running and a purchased copy of Cs 1.6 to play on the NextClient version from GitHub.

Some antivirus engines flag NextClient binaries. These are heuristic false positives caused by runtime detouring of engine functions. Official builds are produced from the source code of this repository by GitHub Actions and carry a signed build provenance attestation. Details and false positive reporting: docs/reporting-av-false-positives.md.

Main features:

Windows and Linux support (x86)
Protector - protects the client from malicious commands from the server
Ability to change the master server (the default ms is tsarvar.com)
Advanced video settings - FOV fix on 16:9 resolutions, ability to adjust FOV and separately adjust FOV for first person model
Advanced killfeed - support for advanced killfeed regamedll, displaying kill icons: through the wall, through smoke, without aiming, jumping, dominating, etc.
Advanced crosshair settings - added new crosshair types: dot, T-shaped, circle
Advanced radar - generated maps with automatic layer selection, player names, teammate health when provided by the server, movement trails, objective markers and a full-map view
Discord integration: current server, connecting and demo playback in the activity, and joining friends through Discord, including launching the game
2 GUI schemes with the ability to change them through the settings, and the ability to add your own schemes without deleting the old ones
HTML interface support in GameUI based on CEF (Chromium Embedded Framework) with a JS API for interacting with the client (Windows only)
Display more than 255hp when using server module
Display number and size of remaining files, total file size and upload speed when connected to the server
Color chat in console
Various improvements from csldr for viewmodel:
- Adjustable origin
- Alternative bob from CS:GO 1.0.0.40
- Sway/lag
- Viewmodel shifting can be disabled
- Client-side weapon inspecting
- Bone controlled camera movement

Features for amxmodx developers:

Cvars sandbox, the ability to change cvars for a client (from a limited list) while a client is on the server
Killfeed customization
Sprite API, control of sprites on the screen
Extended FOV message
Support for viewmodel effects
Weapon sound replacement
Mouse inversion
Client verification and hardware ID (HWID) request
Client platform reporting (Windows or Linux) through the NextClient server API
Separate precache for regular cs 1.6 client and NextClient
Precache of hud.txt and other standard resources

New cvars

Click to expand

Cvar name	Default value	Available in sandbox*	Description
viewmodel_disable_shift	0	Yes	Disable viewmodel shifting (when you looking up or down).
viewmodel_offset_x	0	Yes
viewmodel_offset_y	0	Yes
viewmodel_offset_z	0	Yes
camera_movement_scale	1.0	Yes	Camera movement scale.
camera_movement_interp	0	Yes	Smooths out camera movement when switching weapons. Recommended value is 0.1. Set to 0 to disable smoothing.
viewmodel_fov	90	Yes	Min: 70 Max: 100
cl_crosshair_type	0	Yes	Crosshair type. 0 - crosshair, 1 - T-shaped, 2 - circle, 3 - dot.
cl_bob_camera	1	Yes	View origin bob, does nothing with cl_bobstyle 2.
cl_bobstyle	0	Yes	0 for default bob, 1 for old style bob and 2 for CS:GO style bob.
cl_bobamt_vert	0.13	Yes	Vertical scale for CS:GO style bob.
cl_bobamt_lat	0.32	Yes	Lateral scale for CS:GO style bob.
cl_bob_lower_amt	8.0	Yes	Specifies how much the viewmodel moves inwards for CS:GO style bob.
cl_rollangle	0	Yes	Screen roll angle when strafing or looking (Quake effect).
cl_rollspeed	200.0	Yes	Screen roll speed when strafing or looking (Quake effect).
viewmodel_lag_style	0	Yes	Viewmodel sway style. 0 is off, 1 is HL2 style and 2 is CS:S/CS:GO style.
viewmodel_lag_scale	1.0	Yes	Scale of the viewmodel sway.
viewmodel_lag_speed	8.0	Yes	Speed of the viewmodel sway. (HL2 sway only)
fov_horplus	0	No	Enables Hor+ scaling for FOV. Fixes the FOV when playing with aspect ratios besides 4:3.
fov_angle	90	No (use ncl_setfov instead)	Min: 70 Max: 100
fov_lerp	0	No (use ncl_setfov instead)	FOV interpolation time in seconds.
hud_deathnotice_max	5	Yes	The maximum number of killfeed entries that can be displayed.
hud_deathnotice_old	0	No	Enable the old style of killfeed.
http_max_active_requests	5	No
http_max_requests_retries	3	No
cl_discordrpc	1	No	Show what you're playing in Discord.
cl_discordrpc_server	1	No	Show the server name in Discord. When 0, friends can't join you either.
cl_discordrpc_join	1	No	Let Discord friends join your server.
hud_radar_mode	1	No	Radar mode: 0 - classic, 1 - advanced.
hud_radar_scale	1.15	No	Radar size. Min: 0.5 Max: 3.0
hud_radar_map_scale	0.8	No	Map zoom. Min: 0.25 Max: 3.0
hud_radar_map_shift	0	No	Shift the map near its edges to keep the player marker inside the radar.
hud_radar_opacity	100	No	Map and background opacity, from 0 to 100 percent.
hud_radar_round	1	No	Radar shape: 0 - square, 1 - round.
hud_radar_fullmap	1	No	Show the full map while the scoreboard is open.
hud_radar_shift_scoreboard	1	No	Shift the scoreboard to make room for the radar.
hud_radar_rotate	1	No	Rotate the map with the view direction.
hud_radar_names	0	No	Show player names.
hud_radar_health	0	No	Show teammate health bars when the server provides HealthInfo data.
hud_radar_tracks	0	No	Show teammate movement trails.
hud_radar_map_mode	5	No	Map source: 1 - overview, 5 - generated textured layers, 6 - generated flat layers.
hud_radar_map_mask	1	No	Clip the overview map to the radar shape.
hud_radar_map_smoothing	0	No	Smooth the edges of generated map geometry.
hud_radar_bg	0	No	Radar background: 0 - black, 1 - blurred game image.
hud_radar_health_size	1.0	No	Health bar size. Min: 0.3 Max: 4.0
hud_radar_name_size	0.8	No	Player name size. Min: 0.6 Max: 2.0
hud_radar_allies	1	No	1 - show teammates revealed by the server, 0 - also require line of sight.

*Can the server change the value of a cvar using the cvars sandbox feature.

Console commands

Command	Purpose
`toggle <command> <value1> <value2> [value3...]`	Applies the specified values to a command in sequence, returning to the first after the last.
`+toggle <command> [<held> <released>]`	Applies one value while a key is held and another when released. The values default to 1 and 0 respectively.
`bindlist`	Prints all key bindings to the console.
`lookat`	Inspects the weapon; bound to `V` by default.
`next_version`	Prints the NextClient build version and module versions.

Examples:

bind "F6" "toggle hud_radar_mode 0 1"
bind "F7" "+toggle hud_radar_names"
bindlist

Installation

Windows

NextClient only works with engine version 8684, make sure you are on the beta branch "steam_legacy - Pre-25th Anniversary Build" in Steam (⚠️ Note: you need the official game files from Steam! You cannot install NextClient on pirate clients!)
Copy the entire Counter-Strike 1.6 (Half-Life) folder to a separate folder outside of the Steam folder
Copy all NextClient files to the folder where you copied all the CS 1.6 files
Start Steam.
Run the game via cstrike.exe

Linux

Requirements for GitHub Actions archives:

x86_64 Linux with 32-bit x86 execution support and 32-bit glibc 2.43 or later.
32-bit C++ runtime libraries: on Ubuntu, the packages are libstdc++6:i386 (libstdc++.so.6 with GLIBCXX_3.4.32 or later) and libgcc-s1:i386 (libgcc_s.so.1).
Installed and running Steam, its Steam Runtime, and native Linux game files from the steam_legacy branch.
32-bit SDL2 and OpenGL driver libraries. The advanced radar requires OpenGL 2.1 and framebuffer object support (GL_ARB_framebuffer_object or OpenGL 3.0 or later).

Install the 32-bit C++ runtime libraries on Ubuntu:

sudo dpkg --add-architecture i386
sudo apt update
sudo apt install libstdc++6:i386 libgcc-s1:i386

Installation:

Select the "steam_legacy - Pre-25th Anniversary Build" beta branch in Steam and install the native Linux version of the game.
Copy the entire Counter-Strike 1.6 (Half-Life) folder to a separate folder outside of the Steam folder.
Extract the archive into the folder where you copied all the CS 1.6 files, replacing files. The root of that folder must contain hw.so, cstrike.exe and nextclient.sh.
Start Steam.
In a terminal, enter the copied game folder, set executable permissions and run the script:

cd "/path/to/Half-Life-NextClient"
chmod +x nextclient.sh cstrike.exe
./nextclient.sh

nextclient.sh runs the native Linux client through the Steam Runtime. It finds the runtime in regular and Snap Steam installations. Arguments are passed to the game, for example ./nextclient.sh -windowed.

⚠️ Warning! Never put NextClient files directly into the game installation folder in Steam! This will lead to VAC ban! ⚠️

Changing the master server

The configuration file is located at the path platform\config\MasterServer.vdf

"MasterServer"
{
   "Selected"     "1"       // Item number from the Servers section. Numbering starts from 0.
   "CacheServers" "false"   // In case the master server is unavailable, the servers will be taken from the cache.
                            // The cache contains servers from the last request that was fully completed.
   "Servers"
   {
      "Steam"
      {
         "address" "hl1master.steampowered.com:27011" // Master server address.
         "site"    ""       // Not used.
         "region"  "0x03"   // Region code, see https://developer.valvesoftware.com/wiki/Master_Server_Query_Protocol#Region_codes.
      }
      "Tsarvar"
      {
         "address" "ms.tsarvar.com:27010"
         "site"    "https://tsarvar.com/"
         "region"  "0xFF"
      }
   }
}

Building

Windows

Requirements:

The latest version of MSVC 2022 or later
CMake 3.21 or higher
Git LFS, set up with git lfs install before cloning (in a clone made without it, run git lfs pull)
Ninja (optional)

Run x86 Native Tools Command Prompt for VS

git clone --recurse-submodules https://github.com/CS-NextClient/NextClient.git
cd NextClient

Using Visual Studio 2022 generator:

cmake --preset vs2022
cmake --build --preset vs2022-release --target BUILD_ALL

Using Visual Studio 2026 generator:

cmake --preset vs2026
cmake --build --preset vs2026-release --target BUILD_ALL

Or using Ninja:

cmake --preset ninja
cmake --build --preset ninja-release --target BUILD_ALL

BUILD_ALL also copies all built files and assets to NEXTCLIENT_INSTALL_DIR if the variable is set. You can pass it directly when configuring:

cmake --preset vs2022 -DNEXTCLIENT_INSTALL_DIR="C:/Games/CS 1.6 - NextClient"

Or create a CMakeUserPresets.json in the project root (gitignored) to avoid passing it every time:

{
  "version": 3,
  "configurePresets": [
    {
      "name": "vs2022-local",
      "inherits": "vs2022",
      "cacheVariables": {
        "NEXTCLIENT_INSTALL_DIR": "C:/Games/CS 1.6 - NextClient"
      }
    }
  ],
  "buildPresets": [
    {
      "name": "vs2022-local-release",
      "configurePreset": "vs2022-local",
      "configuration": "Release"
    },
    {
      "name": "vs2022-local-debug",
      "configurePreset": "vs2022-local",
      "configuration": "Debug"
    }
  ]
}

Then:

cmake --preset vs2022-local
cmake --build --preset vs2022-local-release --target BUILD_ALL

Linux

Requirements for building from source:

GCC 15 or later with 32-bit build support (gcc-multilib and g++-multilib on Ubuntu).
CMake 3.21 or later, Ninja, Git LFS, pkg-config, Python 3, curl, zip, unzip and tar.
32-bit OpenGL and X11 development headers and libraries. The build environment package list is in .github/workflows/build.yml.

Clone and build:

git lfs install
git clone --recurse-submodules https://github.com/CS-NextClient/NextClient.git
cd NextClient
./vcpkg/bootstrap-vcpkg.sh -disableMetrics
cmake --preset linux -DNEXTCLIENT_INSTALL_DIR="/path/to/Half-Life-NextClient"
cmake --build --preset linux-release --target BUILD_ALL

The linux preset builds 32-bit modules with Ninja Multi-Config. BUILD_ALL copies libraries, assets and nextclient.sh into NEXTCLIENT_INSTALL_DIR; that folder must contain a separate copy of the native Linux game files.

Working in IDE

CLion

On Windows, use the Visual Studio x86 toolchain; on Linux, use GCC and the linux preset
Enable the required presets in CMake settings (Settings -> Build -> CMake), e.g. vs2022 - vs2022-debug and vs2022 - vs2022-release
Build the BUILD_ALL target

Visual Studio

Open the project folder
Select build preset, e.g. vs2022-debug or vs2022-release
In the main menu, select Build -> Build All

VS Code

Install the ms-vscode.cmake-tools extension
Select the vs2022, vs2026, ninja, or linux configure preset and the corresponding build configuration
Build the BUILD_ALL target
For the ninja preset, VS Code must be launched from "x86 Native Tools Command Prompt for VS"

Thanks

KotyaraKryt - for the Linux port, Discord integration, console commands, FastDL HTTP connection reuse and fixes
Nordic Warrior - for the huge amount of feedback and bug reports
fl0werD - for development of Sprite API
Mikko Kokko - for the project csldr, which features we have integrated into NextClient
Felipe - for the project MetaAudio
MoeMod - for the project Thanatos-Launcher, it helped a lot when implementing GameUI and VGUI2
tmp64 - for the project hl1_source_sdk
TsarVar - for the idea of a JS API for gameui
s1lent - for advice, ready-made fixes, and development of the avatarid-spec specification
lozatto - for contributing the unique machine identifier (HWID) feature
SanyaSho - for the project BarsTech_goldsrc_compatible_public, which helped with VGUI2 font rendering
Valve - for Counter-Strike 1.6 and loyal attitude to the modder community

Thanks to everyone who supports the project with bug reports, suggestions and words of encouragement.

Name		Name	Last commit message	Last commit date
.github		.github
assets		assets
cmake		cmake
custom-vcpkg-ports/concurrencpp		custom-vcpkg-ports/concurrencpp
custom-vcpkg-triplets		custom-vcpkg-triplets
dep		dep
docs		docs
nextclient		nextclient
plugins/nextclient_testlab		plugins/nextclient_testlab
test_assets		test_assets
tools		tools
vcpkg @ b5d1a94		vcpkg @ b5d1a94
.clang-format		.clang-format
.clang-tidy		.clang-tidy
.gitattributes		.gitattributes
.gitignore		.gitignore
.gitmodules		.gitmodules
AGENTS.md		AGENTS.md
CMakeLists.txt		CMakeLists.txt
CMakePresets.json		CMakePresets.json
README.md		README.md
README.ru.md		README.ru.md
vcpkg.json		vcpkg.json

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NextClient

Main features:

Features for amxmodx developers:

New cvars

Console commands

Installation

Windows

Linux

⚠️ Warning! Never put NextClient files directly into the game installation folder in Steam! This will lead to VAC ban! ⚠️

Changing the master server

Building

Windows

Linux

Working in IDE

CLion

Visual Studio

VS Code

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NextClient

Main features:

Features for amxmodx developers:

New cvars

Console commands

Installation

Windows

Linux

⚠️ Warning! Never put NextClient files directly into the game installation folder in Steam! This will lead to VAC ban! ⚠️

Changing the master server

Building

Windows

Linux

Working in IDE

CLion

Visual Studio

VS Code

Thanks

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