View source for Source 2004

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{{Infobox engine
| title		 = Source 2004
| developer	 = [[Valve Corporation]]
| platform	 = {{Win|1}}, {{xbox|1|nt=1}}
| releasedates	 = October 7, 2004 (original)</br>October 27, 2005 ({{hl2lc}}, v2)
| sdk		 = [https://github.com/Source-SDK-Archives/source-sdk-2004 Source SDK] <small>(GitHub unofficial archive)</small>
}}
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{{src04|4}} is the original build of the {{Source|3.1}} engine that {{hl2|3.1}}, {{hls|3.1}} and {{css|3.1}} shipped with, then subsequently updated with the release of {{hl2lc|3.1}} (and {{dods|1}}), adding some features which would become standard with {{src06|1}}. The Source 2004 engine was succeeded by the {{src06|3.1}} engine branch with the release of {{hl2ep1|3.1}}.

No current [[Valve]] titles hosted on [[Steam]] use this particular engine branch, as it is outdated.

It was distributed in {{code|source engine.[[gcf]]}}.

{{vtmb|4}} still runs on a custom version of the engine which is more similar to the engine used in the '''Half-Life 2 leak''' (unofficially referred to as '''Source 2003'''). However, it uses a proprietary texture format, {{python|1}} for scripting, [[BSP (Source)|BSP]] version 17, and supports [[Bink]] videos.

{{sineps|4}} likely runs on modified {{hl2lc|2}} version of Source 2004, which contains few commands related to the [[HDR|HDR Rendering]] which was non-functional (<code>"mat_hdr_level"</code>), aside from that it also stripped BSP 20 support from Lost Coast.

The engine versions for this branch are {{code|build 2106}} up to {{code|2497}} ({{code|Protocol 5-7}}). The second version of Source 2004 (introduced with Lost Coast, adding [[HDR]] and other new features), started with {{code|build 2547}} until {{code|2707}} ({{code|Protocol 7}}).{{Cite|1}}

== Features ==
{{Main|Source#Features|Source - Features section}}
;Support for {{xbox|2}} game console
;Steam Friends & Parlor Games menu (removed in later version of {{src06|1}} in 2009)
;Shader Model 2.0 only
;[[Anti-aliasing]]
:Up to 6x MSAA. 8x MSAA unofficially supported through {{code|mat_antialias 8}}, but will reset to 4X on next launch. MSAA 8X can be also forced through GPU drivers control panel.
:6x MSAA does not work on modern graphics card. Only 4x works.
;[[DirectX]] 9.0
:Uses Direct3D 9.0, with support for these hardware levels:
:[[DirectX Versions#DirectX 6|DirectX 6.0]] ({{code|dxlevel 60}}) level (not officially supported, but works)
:[[DirectX Versions#DirectX 7|DirectX 7.0]] ({{code|dxlevel 70}}) level
:[[DirectX Versions#DirectX 8.0|DirectX 8.0]] ({{code|dxlevel 80}}) level
:[[DirectX Versions#DirectX 8.1|DirectX 8.1]] ({{code|dxlevel 81}}) level
:[[DirectX Versions#DirectX 9|DirectX 9.0]] ({{code|dxlevel 90}}) level
; Inputs
:Support DirectInput controller only

=== Since Lost Coast engine update ===
; [[High Dynamic Range|High Dynamic Range rendering]]{{Cite|2}} {{dx9}}
: A simulation of brightness values outside computer monitors' actual range, and of [[wikipedia:Aperture|aperture]] adjustment. ''Not to be confused with HDR display output''.
: While being attributed to Source 2006, this feature was first introduced with {{hl2lc|4}} (which runs on an updated version of Source 2004).{{Cite|2}}{{Cite|3}} {{hl2|1}} was also upgraded to the Lost Coast version of Source 2004, but not all Half-Life 2 maps are HDR-compiled by default, leaving the HDR feature unused. SiN Episodes also runs on this version and feature {{code|mat_hdr_level}} console command, but support for HDR was stripped in code which leaves it non-functional.
; [[mat_dxlevel|Direct3D 9 - Shader Model 3]] (DirectX 9.0+ feature level/{{code|style=2|dxlevel 95}})
: Unlocks greatly improved shader performance.
; [[Commentary System]]
: Allows DVD-like director's commentary to be embedded inside levels. Commentary System was used in {{hl2lc|1}}.

== Removed features (post-launch) ==
; 64-bit binaries
: In December 2005, {{hl2|2}} and {{hl2lc|2}} was updated to add 64-bit support, allowing it to access more than 2GB (4GB with LAA) of RAM, and increase performance slightly. However it was later discontinued and removed due to its instability on some systems. 64-bit support was later reintroduced with {{Csgo|1}} (on Mac/Linux), and later the {{tf2branch|1}}, without any technical issues. The {{tfbranch|1}} also has 64-bit binaries.

== Availability ==
The source code for this branch is '''no longer officially available'''. All Valve games that run on {{src04|3.1}} are now currently using {{src13sp|3.1}} or the {{tf2branch|3.1}} (formerly {{src13mp|3.1}}).

An archive of the 2004 SDK is [https://github.com/Source-SDK-Archives/source-sdk-2004 available on GitHub]. SDK Base for this branch does not exist as mods using 2004 SDK are base directly on Half-Life 2 (requires older version of the game running on 2004 branch), instead of Source SDK Base.

== Usage ==
{{see also|[[:Category:Source 2004 engine branch games]]}}
The following games are still based on, or currently using {{src04|1}}.
=== Valve ===
* {{Code|style=2|2005}} {{hl2xbox|4}}

=== Third-Party ===
* {{Code|style=2|2004}} {{vtmb|4}} <span style="cursor:help" title="The engine of VTMB was based off the Half-Life 2 Beta engine (Source 2003) with modifications and uses proprietary texture formats.">(Beta version)</span>
* {{Code|style=2|2006}} {{sineps|4}}

== System Requirements ==
<p style="color:white; font-weight:bold">Minimum Specs :</p>
*OS: Windows [[WP:Windows 98|98]] / [[WP:Windows ME|ME]], [[WP:Windows 2000|2000]], [[WP:Windows XP|XP]] or later
*[[WP:Central processing unit|CPU]]: 1.2 [[WP:Hertz|GHz]]
*[[WP:Random-access memory|RAM]]: 256 [[WP:Megabyte|MB]]
*Nvidia GeForce FX 5700, ATI Radeon 9500 (with 128MB [[WP:Video random-access memory|VRAM]])
*[[WP:Direct3D|Direct3D]] 9.0 compatible [[WP:Video card|video card]] (with atleast DirectX 6.0 compatibility level or higher)
{{Note|Due to Steam dropped support for previous version of Windows, Windows 10 or later is required to run any Source 2004 games that use Steam DRM.}}

== See also ==
* {{src06|1}}

{{references|1=
{{ref2|cite id=1|[https://docs.google.com/spreadsheets/d/1ldzhd6vxd-03le5ymesUeG-hLWmxLpH79ajayeYDUNs/ Source Engine Build List - Google Spreadsheets]}}
{{ref2|cite id=2|See [https://advances.realtimerendering.com/s2006/Mitchell-ShadingInValvesSourceEngine.pdf PDF]. Lost Coast did not use {{code|base source engine 2.gcf}} (Source 2006 binaries), but rather {{code|source engine.gcf}} (which is Source 2004 binaries). Said GCF file was later updated to contain {{code|dxlevel 95}} on {{code|dxsupport.cfg}} after the release of Half-Life 2: Lost Coast), and DODS only used it after an update. Also {{sineps|2}}, a Source 2004 game which seems to be built on Lost Coast engine, have non-functional HDR console command {{code|mat_hdr_level}}, but also does not support BSP 20 from Lost Coast.}}
{{Ref2|cite id=3|[https://wiki.openag.pro/en/Source/Source_game_and_engine_differences Differences between games and game versions - SourceRuns Wiki.js]}}
}}

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