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===CRT-Guest-Dr-Venom===*[https://githubis the precursor to CRT-Guest-Advanced.com/libretro/slangIt is now considered mostly obsolete, as it is not as feature-filled as Guest's newest shaders/tree/master/crt/and has even been superseded in speed by the faster Advanced presets. As such, it should only be used if your device is unable to load slang shaders/guest/crt-gdv-new crt-guest-dr-venom], as it has recently been removed from the slang shader repository but remains available as a glsl shader, though the slang version can still be acquired in the first post of Guest's thread.
The precursor to CRT -Guest-Advanced. While it is now considered outdated and not as feature-filled as Guest's newest shaders, it is much faster, more so than even the fastest Advanced preset, and it still has plenty of things to tweak to deliver a pleasing image. It therefore fills a middle-of-the-road niche among CRT shaders, delivering a nice balance of features and performance.
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==Types==
===CRT-Geom===
[[File:Retroarch_2013-07-22_17-21-17-60.png|thumb|298px|CRT-Geom-Flat, with default settings]]
{{Main|CRT Geom}}
*[https://github.com/libretro/slang-shaders/blob/master/crt/shaders/crt-geom.slang crt-geom.slang]
A very versatile and modifiable shader that simulates an aperture grille display (with the mask enabled). One of the first popular CRT shaders. The deluxe version adds more features, including more mask types. Visit the main article for more details.
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===CRT-Caligari===
[[File:crt-caligari-sm.png|thumb|298px|CRT-Caligari, with default settings at 1080p (view original for full details)]]
*[https://github.com/libretro/slang-shaders/blob/master/crt/shaders/crt-caligari.slang crt-caligari.slang]
An older CRT shader similar to CRT-Geom that uses different methods to achieve its effects.
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===CRT-Easymode===
[[File:crt-easymode.png|thumb|298px|CRT-Easymode, with default settings at 1080p (view original for full details)]]
*[https://github.com/libretro/slang-shaders/blob/master/crt/shaders/crt-easymode.slang crt-easymode.slang]
*[https://github.com/libretro/slang-shaders/tree/master/crt/shaders/crt-easymode-halation crt-easymode-halation]
A fast, relatively simple CRT shader with easy-to-understand settings. Similar to CRT-Geom in its effects.
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===CRT-Hyllian===
*[https://github.com/libretro/slang-shaders/tree/master/crt/shaders/hyllian crt-hyllian]
Recently, after a long period of inactivity, Hyllian has restarted shader development anew, releasing all-new versions of this shader under heavy inspiration from CRT-Guest-Advanced and others. They can be acquired at his thread on the libretro forums, linked above.
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===CRT-Lottes===
[[File:crt-lottes-multipass.png|thumb|298px|CRT-Lottes-Multipass, with default settings at 1080p (view original for full details)]]
*[https://github.com/libretro/slang-shaders/blob/master/crt/shaders/crt-lottes.slang crt-lottes.slang]
*[https://github.com/libretro/slang-shaders/blob/master/crt/shaders/crt-lottes-fast.slang crt-lottes-fast.slang]
A newer CRT shader that uses a horizontal shadow mask pattern with blooming. The horizontal pattern works quite well at 1080p, though it isn't entirely accurate to a true vertical slot mask pattern. The multipass version adds scanline bloom and a few other features.
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===GTU===
[[File:GTU.png|thumb|298px|GTU, with default settings at 1080p (view original for full details)]]
*[https://github.com/libretro/slang-shaders/tree/master/crt/shaders/gtu-v050 GTUv050 slang]
*[https://github.com/hizzlekizzle/quark-shaders/tree/master/GTU.shader GTUv040 Quark]
The test program is a program that can adjust various attributes, such as horizontal and vertical blur, scanlines, etc. It is useful for testing settings to use with the shader, and also to understand how CRT shaders work in general.
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===ZFast_CRT===
[[File:crt-zfast.png|thumb|298px|ZFast_CRT, with aperture grille mask enabled at 1080p (view original for full details)]]*[https://github.com/libretro/slang-shaders/tree/master/crt/shaders/zfast_crt zfast_crt]
An extremely fast CRT shader made to run at full speed on extremely low-end hardware like the Raspberri Pi 3. Probably the fastest shader on this list.
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===CRT-Royale===
{{Main|CRT-Royale}}
[[File:CRTcrt-Royaleroyale.png|thumb|298px|CRT-Royale, with default settings at 1080p (view original for full details)]]
*[https://github.com/libretro/slang-shaders/tree/master/crt/shaders/crt-royale CRT-Royale]
CRT-Royale-Kurozumi is a preconfigured CRT-Royale made to look like a professional CRT monitor, specifically Sony's PVM/BVM line of monitors.
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===CRT-Guest-Advanced===
[[File:crt-guest-dr-venom.png|thumb|298px|CRT-Guest-Dr-Venom, with default settings at 1080p. The newer Advanced shader's default settings look identical (view original for full details)]]
*[https://forums.libretro.com/t/new-crt-shader-from-guest-crt-guest-advanced-updates/25444 Guest's shader development thread]
*[https://github.com/libretro/slang-shaders/tree/master/crt/shaders/guest crt-guest-advanced]
*[https://github.com/libretro/glsl-shaders/tree/master/crt/shaders/guest crt-guest-dr-venom]
This is quite possibly the most advanced, feature-rich CRT shader of all. It The standard version has just as many if not even more parameters to configure than CRT-Royale , and while being more optimizedit is slower as a result, and if most modern GPUs can handle it just fine. If greater speed is desired, there are several faster versions presets available, as well as variants that add other neat features such as NTSC emulation and better support for games that render at 480p or higher. It is also still in active development and continues to regularly gain features and optimizations. Take heed, however: while it is also one of hosted on the RetroArch shader repositories, it is only shaders without a central public Github repo, as its developer has opted for release bundles linked to updated in that platform when Guest himself deems it ready. Much more regular WIP releases are made in the libretro forums insteadin the shader's dedicated thread, linked above. While RetroArch does host a The version of it in their shader repos, it the RetroArch repo is highly outdatedrelatively up-to-date, so but it is recommended might not hurt to update it using the latest release from the developercheck on Guest's dedicated libretro forum thread, linked abovefor newer developments.
===Sony Megatron===
[[File:sony-megatron.png|thumb|298px|Sony Megatron, using the reference preset in SDR mode with the "1000 TVL" aperture grille mask (view original for full details)]]
*[https://github.com/libretro/slang-shaders/tree/master/hdr Sony Megatron]
*[https://forums.libretro.com/t/sony-megatron-colour-video-monitor/36109/957 Sony Megatron development and discussion thread]
This shader is quite unique among CRT shaders, and shaders in general. It is currently the only shader that takes advantage of HDR support for greater color depth and brightness, allowing for highly accurate CRT emulation on HDR-capable displays, though it is also usable on regular SDR displays through a parameter change. Unlike other CRT shaders, its inner workings are actually fairly simple and it doesn't have many bells and whistles, focusing mainly on drawing scanlines and accurate phosphor masks as well as color correction, which coincidentally also makes it one of the fastest shaders featured on this page. As it is primarily meant for use on bright HDR-capable displays, it draws phosphor masks at full strength with no attempt at mitigating the resulting loss in brightness through parameters such as bloom, glow or mask strength typically seen in other CRT shaders, instead counting on the display to make up for it. On an SDR display, it is highly recommended to use it with the backlight turned up all the way, as otherwise the image will likely be too dim to view comfortably. There are presets emulating various CRT models and types, including several PVM models, certain arcade displays, and even PC monitors.
Taking into account the three mask types and the variance in TVL and dot pitch, then, along with many other variables, it is no wonder no two CRTs looked alike.
==See also==
*[[Shader_Presets|Shader Presets]]
:*[[Shaders_and_filters|Shaders and filters]]
:*[[NTSC_filters|NTSC filters]]
==External Links==
*[http://filthypants.blogspot.com/2015/04/more-crt-shaders.html More CRT Shaders (filthypants.blogspot.com)] - hunterk's comparison of current CRT shaders.
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[[Category:Shaders/Filters]]
