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These replicate aperture grille CRTs, which have sharp images and strong scanlines===CRT-Lottes===*[https://github.com/libretro/common-shaders/blob/master/crt/shaders/crt-lottes. If you find that this doesn't look a damn thing like your old TV, it's probably because you owned a shadowcg crt-mask style CRT, which has less noticeable scanlines (the easiest way to tell the difference is to feel the curve of the screen; aperture grilles only curve horizontally if at all)lottes.cg]*[https://github. Unfortunately, shadow masks require resolutions of upwards of 3000x4000 to emulate accurately, so all we have for the time being are aperture grille com/libretro/common-shaders/blob/master/crt/shaders/crt-lottes-halation.cg crt-lottes-halation.cg]
Use integer scalingA newer CRT shader that uses a horizontal shadow mask pattern with blooming. This means either using windowed mode (x2,x3The horizontal pattern works quite well at current resolutions,x4) or setting an integer scaling option in the video options. The reason is that non-integer scaled scanlines will result in uneven lines with artifactsthough it isn't entirely accurate to a true vertical slot mask pattern.
==Tweaking A CRT Geom==You shader that focuses more on simulating blur and blending effects and color levels of CRT screens rather than the physical attributes like phosphors and curvature. Highly configurable, can open up CRT Geom be really sharp, or really blurry or anywhere in between, with optional scanlines and contrast and gamma settings. Settings are stored in notepad a separate "config.h" file for easy editing. GTU-Famicom is a variant that takes an image from an NES with "raw" colors and edit processes itto output an NTSC image much like an actual NES PPU.
===Scanlines===vec4 weights = vec4(distance / 0.3);Raise the 0.3 to The test program is a higher value to make the scanlines brighter. I do not recommend going past 0.4program that can adjust various attributes, such as at that point on bright colors horizontal and vertical blur, scanlines completely disappear, etc. It is useful for testing settings to use with the shader, and going further makes them appear again, but on the wrong field also to understand how CRT shaders work in said bright colors, which is inaccurate. Try 0.35general.
To make it flat, just set cornersize (line 107) to something small, like 0.001 and cornersmooth (line 110) to something large, like 8000.0. Then, comment out (i.e., put two slashes in front of it, like this*[https: // ) line 141, #define CURVATUREgithub.com/libretro/common-shaders/tree/master/crt/shaders/crt-royale CRT-Royale]
Define Curvature. Something like A highly advanced multi-pass CRT shader that Comment it outsimulates almost every aspect of the CRT screen. That means adding "//" in front There are tons of itparameters to configure, such as phosphor type (aperture grille, slot mask, and EDP shadow mask) and size (i. It should look like e. dot pitch), convergence offests, scanline blooming and many others. Higher resolution is better for this when you're done:<br />//#Define Curavtureshader, especially with EDP shadow mask phosphor layout and with smaller phosphor dot pitch values. This shader is really complicated compared to most other CRT shaders, reading the README and the documentation in the user-settings.h is a must.
For the original, to disable interlacing, change this line*[https:<br />ilfac = vec2(1/github.0,floor(rubyInputSize.ycom/libretro/common-shaders/blob/200.0));<br master/>to the following:<br cgp/>ilfac = vec2(1.0,1crt-royale-kurozumi.0);===Phosphor===To disable phosphor emulation (which alternately tints pixels green and magenta), comment out the following lines, found at the bottom of the shader code:cgp CRT-Royale-Kurozumi]
vec3 dotMaskWeights = mix(<br />vec3(1.0, 0.7, 1.0),<br />vec3(0.7, 1.0, 0.7)A preconfigured CRT-Royale made to look like a professional CRT monitor,<br specifically Sony's PVM/>floor(mod(mod_factor, 2BVM line of monitors.0))<br />);<br />mul_res *= dotMaskWeights;
If you're using a CRT monitor, you can use [http://www.mediafire.com/download/6ygh7saafpn7gm0/CRT-Geom_for_CRT_monitors.7z these] variants of CRT-Geom at 1280x960 full screen for an authentic 240p look. These variants are based on the flat variant with phosphor code commented out and the gamma correction disabled. There are three main variants (Normal, Sharp, Sharper), and each have different scanline brightness presets and interlacing enabled/disabled. As above, use integer scaling and force 4:3 aspect ratio. Some games may have black borders due to the full overscan area being visible, use your monitor's zoom function to zoom in and hide overscan. Also works with handheld games if you use the non-interlaced variant and force a 4x scale in RGUI.
grammar
[[File:CrtRetroarch_2013-geom07-22_17-21-17-60.png|thumb|350px298px|crtCRT-geomGeom-flatFlat, with default settings]]==Many of these replicate aperture grille CRTs, which have sharp images and strong scanlines. If you find that this doesn't look a damn thing like your old TV, it's probably because you owned a shadow-mask (Slot mask or dot mask) style CRT, which has less noticeable scan lines. The easiest way to tell the difference is to feel the curve of the screen; aperture grilles only curve horizontally if at all, or look at the left and right sides of the glass against the frame. If those sides are curved, it's a shadow mask. If they're straight, it's an aperture grille. Old TVs usually had slot masks, whereas monitors usually had dot masks. Unfortunately, shadow masks require resolutions of upwards of 4K UHD to emulate accurately with no downsampling of the phosphor grid, so all we have for the time being are aperture grille shaders for current display resolutions. Use integer scaling. This means either using windowed mode (x2,x3,x4) or setting an integer scaling option in the video options. The reason is that non-integer scaled scanlines will result in uneven lines with artifacts, though some shaders use oversampling to try to avoid this. ==Download====
https://github.com/libretro/common-shaders/tree/master/crt
==OverviewTypes=====CRT-Geom==={{Main|CRT Geom}}*[https://github.com/libretro/common-shaders/blob/master/crt/shaders/crt-geom.cg crt-geom.cg]*[https://github.com/libretro/common-shaders/blob/master/crt/shaders/crt-cgwg-fast.cg crt-cgwg-fast-cg] Simulates an aperture grille display (with the dot mask enabled). Very versatile and modifiable. One of the first popular CRT shaders. Visit the main article for more details. ===CRT-Calagari===*[https://github.com/libretro/common-shaders/blob/master/crt/shaders/crt-caligari.cg crt-calagari.cg] An older CRT shader similar to CRT-Geom but uses different methods to achieve its effects. ===CRT-Easymode===*[https://github.com/libretro/common-shaders/blob/master/crt/shaders/crt-easymode.cg crt-easymode.cg]*[https://github.com/libretro/common-shaders/tree/master/crt/shaders/crt-easymode-halation crt-easymode-halation] A flat CRT shader whose settings are easier to understand. Similar to CRT-Geom in its effects. ===CRT-Hyllian===*[https://github.com/libretro/common-shaders/blob/master/crt/shaders/crt-hyllian.cg crt-hyllian.cg]*[https://github.com/libretro/common-shaders/blob/master/crt/shaders/crt-hyllian-fast.cg crt-hyllian-fast.cg] Aims only for picture quality, so it avoids things that degrade the image just for accuracy. It, however, uses far less power to run, so it is possible to run this shader on lower end systems than CRT-Geom. Another version, crt-hyllian-lq.cg is specifically aimed at even lower end systems.
==CRT Geom=GTU===*[https://github.com/libretro/common-shaders/tree/master/crt/shaders/gtu-v050 GTUv050 Cg]*[https://github.com/hizzlekizzle/quark-shaders/tree/master/GTU.shader GTUv040 Quark]*[https://github.com/libretro/common-shaders/tree/master/crt/shaders/GTU-famicom GTU-Famicom Cg]One of the more popular CRT *[https://github.com/hunterk/interpolation-shaders/raw/master/GTUv050test.tar.gz GTUv50 Test program]
===CurvatureCRT-Royale==={{Main|CRT-Royale}}[[File:CRT-Royale.png|thumb|298px|CRT-Royale, with default settings at 1080p (view original for full details)]]
===InterlacingCRT-Royale-Kurozumi===
=====Variants========CRT Geom=Future==
===Shadow Mask Phosphor Emulation===
Hypothetical shadow mask phosphor shaders such as PhosphorLUT and CRT-Royale are being developed. Due to the nature of the shadow mask screen, 4K resolution is likely needed to avoid significant downsampling of the phosphors.
==External Links==*[http://filthypants.blogspot.com/2015/04/more-crt-shaders.html More CRT Monitor variant===Shaders (filthypants.blogspot.com)] - hunterk's comparison of current CRT shaders.
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