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One of the more '''CRT-Geom''' is a popular CRT shadersshader created by cgwg.
===CRT Monitor variant===
If you're using a CRT monitor, you can use the variants of CRT-Geom at 1280x960 full screen for a near 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.
Protected "CRT Geom" ([Move=Allow only administrators] (indefinite))
[[File:Retroarch_2013-07-22_17-21-17-60.png|thumb|298px|CRT-Geom-Flat, with default settings]]
==Download==
*[https://github.com/libretro/common-shaders/blob/master/crt/shaders/crt-geom-flat.cg CRT Geom flagcrt-geom.cg] *[https://githubgist.com/libretro/common-shaders/tree/master/crt/crt-interlaced-halation] *[https://github.com/libretro/common-shaders/blob/master/crtanonymous/dda125d65ded3fe9ed955800666eacf9 crt-geom-flat-sharpness.cg] *[http://www.mediafire.com/download/6ygh7saafpn7gm0/CRT-Geom_for_CRT_monitors.7z]
==Versions==
A multipass version with a "halation" effect that replicates the bloom of a CRT TV.
==Tweaking CRT Geom==
CRT Geom is highly customizable. You can open up CRT Geom the .cg file in [http://notepad-plus-plus.org/ notepadNotepad++] and edit it. Regular notepad will work, but notepadNotepad++ is recommended.
Shader parameters can be changed by editing the first value of the parameter at the beginning of the file, or through [[RetroArch]]'s shader menu.
[[File:Retroarch_2013-07-22_17-22-39-87.png|thumb|225px|CRT-Geom-Flat, with brighter scanlines]]
===Sharpness===
'''old xml XML shader format only'''
[[File:Retroarch_2013-07-22_19-24-11-41.png|thumb|225px|CRT-Geom-Flat, at 2x sharpness]]If you find the shader looks too blurry, you can increase the sharpness by going to the sections in the code that have the following lines (should be at the beginning of both the vertex and fragment portions of the shader code):
uniform vec2 rubyInputSize;
===Curvature===
'''old xml shader format only'''
To make it flat, just set cornersize corner size (line 107) to 0.001 and cornersmooth corner smooth (line 110) to 8000.0. Then, comment out (i.e., put two slashes in front of it, like this: // ) line 141, #define CURVATURE.
//#Define CURVATURE
mul_res += pow(tex2D(decal, xy2).rgb, float3(monitorgamma))*0.1;
Lowering the last number reduces the effect of the halation. This is prefered preferred since the default halation level is too high.
[[Category:FAQs]]
[[Category:Shaders/Filters]]
