View source for Titanfall engine branch

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[[File:Apex Legends - Screenshot 5.jpg|340px|thumb|Promotional screenshot of {{apex|4.1}}, which runs on a heavily modified version of the Source Engine called {{tfbranch|3.1}}, featuring [[DirectX Versions|DirectX (Direct3D)]] 11, detailed models and better graphics, plus increased the engine limit, allowing maps to be larger.]]
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The {{tfbranch|4}} (also known as ReSource internally) is a third-party {{Source|3.1}} branch developed by [[W:Respawn Entertainment|Respawn Entertainment]] using licensed Source Engine code from [[Valve]]. It is a heavily modified version of the {{p2branch|1}}{{cite|1}} that adds many huge modifications and improvements that bring Source close to modern standards, while keeping the game running on consoles at 60FPS with stable framerate. This engine branch is still in active development.

It is also the only Source branch to be released on modern consoles.

== Features ==
{{todo|List all of the features of this modified engine.}}
=== Renderer ===
; Native [https://en.wikipedia.org/wiki/DirectX#DirectX_11 DirectX 11] ([[DirectX_Versions#DirectX_11|dxlevel 110]]) and [https://en.wikipedia.org/wiki/DirectX#DirectX_12 DirectX 12] ([[DirectX_Versions#DirectX_12|dxlevel 120]]) {{apex|only}} renderer
: First Source engine branch to support both DirectX 11 and 12 renderer.
: DirectX 11 (Direct3D 11) is used by default, supported in all games. Previous versions (DirectX 9.0c) has been dropped.
: DirectX 12 (Direct3D 12) is currently only supported in {{apex|1}}, and can be enabled with {{code|-anticheat_settings{{=}}SettingsDX12.json}} [[command line argument]]. Requires Windows 10 or later.<br>
; [[Deferred lighting|Deferred shading]]
: Allow many lights to be rendered on scene with little performance impact.
; New rendering system with [[Physically Based Rendering]]
: 
; Texture streaming {{also|{{csgo}}{{strata}}{{vindictus}}}}
: Reduce system RAM and graphics card VRAM by streaming textures.
; Better [[HDR|HDR Rendering]]
: Improves the HDR (bloom) lighting.{{clarify}}
; Native HDR displays support (not to be confused with HDR Rendering)
: Outputs the game image to HDR-capable display, which is capable of rendering image with higher contrast, brighter image and more intense colors. Exclusive to {{ps5|1}} and {{xboxseries|1}} version of {{apex|1}} only. On PC, it can be workaround by using Windows 11's Auto HDR feature.
; [[Anti-aliasing#TAA|TAA anti-aliasing]]
: '''TAA''' (aswell as TXAA, TSSAA/TSAA and other variant of TAA) is a new method of anti-aliasing which was common in later games since 2010s, as most games are transitioning from forward rendering to deferred rendering which allows many lights to be rendered with little performance impact. TAA is a spatial anti-aliasing technique that works by combines information from past frames and the current frame (while simultaneously jittering between both frames) to smooth the current frame. Through it's main drawbacks is that it can cause ghosting and blurriness (basically creating motion blur) to the image, especially on lower framerate ([https://www.youtube.com/watch?v=GJ0eFYJYkkw Example]). Some of the TAA drawback can be workaround by applying sharpening filter on the image.
: TAA was first introduced with {{Titanfall|1}} as "TXAA" which requires "MSAA" to function, but this result in sharper image quality compared to regular TAA/TSSAA, which later introduced in {{titanfall2|1}}, replacing TXAA. MSAA were later removed starting with {{apex|1}}.

=== Audio ===
; Custom in-house Sound System
:
; Audio system improvements
: Speex audio codec
: Titanfall uses Wwise sound system.
: Miles Sound System (for {{titanfall2|1}} and {{apex|1}}) has been updated to properly support 7.1 surround on modern version of Windows and better [[DSP]] effects.
=== Networking ===
; New netcode and {{only|{{apex}}}} Cross-play support
: Cross-platform multiplayer is supported starting with {{apex|1}}, allowing users other platforms (such as consoles), to play with PC users.
=== Platform ===
; 64-bit support
: Full support for 64-bit, which improves performance and allow the engine to access more than 4GB of RAM. 32-bit are not supported on this branch.
; Modern and next-gen console support ({{PS4|2}}, {{PS5|2}}, {{nsw|2}}, {{Xboxone|2}} and {{XboxXS|2}})
: Supports next-generation consoles.
=== Other ===
; Customized version of [[BSP]] and [[VPK]]
: Titanfall uses BSP version 29, with the BSP headers using {{code|rBSP}} (Respawn BSP) instead of {{code|VBSP}} as identifier.

== Availability ==
{{see also|[[:Category:Titanfall engine branch games]]}}
* {{titanfall|4}} (earlier version, delisted on Steam)
* {{titanfall2|4}} (earlier version)
* {{apex|4}}

{{References|
{{Ref2|cite id=1|According to the sequel Titanfall 2's <code>steam.inf or gameinfo.txt</code>, the engine contains a leftover appid (620) for {{portal2|4}} as of March 2024.
{{Confirm|Does Apex Legends or Titanfall 1 have this?}}}}
}}

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[[Category:Third-Party Engine Branches]]