Another fast CRT shader

MaruKC99 · 23 November 2024 01:35

I’ve been using this a lot more than I expected, it’s great considering how light and easy to run it is. Thank you for making it.

georgeston · 22 March 2025 16:28

For the GLSL (OpenGL) version two new shaders based on Fakelottes has been added, with the same nice looking mask and scanlines combined with a smooth border and rounded corners. Could this be ported to Slang too, please?

github.com

libretro/glsl-shaders/blob/master/crt/shaders/fakelottes-geom.glsl

// Corners lifted from fake-crt-geom. Defaults set nicely.
// Parameter range extended to allow brightness compensation
// by Rogalian aka cools
// On sub-HD resolution devices, suggest Scanline Intensity: 0.0

// Simple scanlines with curvature and mask effects lifted from crt-lottes
// by hunterk

////////////////////////////////////////////////////////////////////
////////////////////////////  SETTINGS  ////////////////////////////
/////  comment these lines to disable effects and gain speed  //////
////////////////////////////////////////////////////////////////////

#define MASK // fancy, expensive phosphor mask effect
#define CURVATURE // applies barrel distortion to the screen
#define SCANLINES  // applies horizontal scanline effect
//#define ROTATE_SCANLINES // for TATE games; also disables the mask effects, which look bad with it
#define EXTRA_MASKS // disable these if you need extra registers freed up
#define BORDER // border + rounded corners

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github.com

libretro/glsl-shaders/blob/master/crt/shaders/fakelottes-geom-mini.glsl

// Hack together of fakelottes (shadowmask and curvature)
// and fake-CRT-geom (smooth border and corners)
// by Rogalian aka cools
// Scanline effect stripped from fakelottes, causes moire on low
// resolution devices and we gain a performance with it
// removed.

////////////////////////////////////////////////////////////////////
////////////////////////////  SETTINGS  ////////////////////////////
/////  comment these lines to disable effects and gain speed  //////
////////////////////////////////////////////////////////////////////

#define MASK // fancy, expensive phosphor mask effect
#define CURVATURE // applies barrel distortion to the screen
#define BORDER // border + rounded corners

////////////////////////////////////////////////////////////////////
//////////////////////////  END SETTINGS  //////////////////////////
////////////////////////////////////////////////////////////////////

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This makes it look even better IMO.