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feat: add "Vignette" parameter for shader newpixie-crt

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An option to control the vignetting of one of my favorite crt shader newpixie-crt

based on CybeREX works from the libretro forum:
https://forums.libretro.com/t/remove-wavy-distortion-newpixie-crt-shader/28929
https://forums.libretro.com/u/CybeREX
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Jean 2023-01-28 16:05:37 -05:00 • committed by GitHub
parent 39fd0bef8f
commit 4bd7386a33
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1 changed files with 4 additions and 3 deletions
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7
crt/shaders/newpixie/newpixie-crt.slang
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@ -54,7 +54,8 @@ layout(push_constant) uniform Push
float use_frame;
float curvature;
float wiggle_toggle;
float scanroll;
float scanroll;
float vignette;
} params;
#pragma parameter use_frame "Use Frame Image" 0.0 0.0 1.0 1.0
@ -62,7 +63,7 @@ layout(push_constant) uniform Push
#pragma parameter curvature "Curvature" 2.0 0.0001 4.0 0.25
#pragma parameter wiggle_toggle "Interference" 0.0 0.0 1.0 1.0
#pragma parameter scanroll "Rolling Scanlines" 1.0 0.0 1.0 1.0
#pragma parameter vignette "Vignette" 1.0 0.0 1.0 0.05
#define gl_FragCoord (vTexCoord.xy * params.OutputSize.xy)
#define backbuffer accum1
#define blurbuffer blur2
@ -174,7 +175,7 @@ void main()
col = clamp(col*1.3 + 0.75*col*col + 1.25*col*col*col*col*col,vec3(0.0),vec3(10.0));
/* Vignette */
float vig = (0.1 + 1.0*16.0*curved_uv.x*curved_uv.y*(1.0-curved_uv.x)*(1.0-curved_uv.y));
float vig = ((1.0-0.99*params.vignette) + 1.0*16.0*curved_uv.x*curved_uv.y*(1.0-curved_uv.x)*(1.0-curved_uv.y));
vig = 1.3*pow(vig,0.5);
col *= vig;