79 lines
2.5 KiB
GLSL
79 lines
2.5 KiB
GLSL
#include "../math/lengthSq.glsl"
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#include "../sampler.glsl"
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/*
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contributors:
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- Patricio Gonzalez Vivo
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- Johan Ismael
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description: Chroma Aberration
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use: chromaAB(<SAMPLER_TYPE> texture, <vec2> st [, <float|vec2> sdf|offset, <float> pct])
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options:
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CHROMAAB_TYPE: return type, defauls to vec3
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CHROMAAB_PCT: amount of aberration, defaults to 1.5
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CHROMAAB_SAMPLER_FNC: function used to sample the input texture, defaults to texture2D(TEX,
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UV)
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CHROMAAB_CENTER_BUFFER: scalar to attenuate the sdf passed in
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license:
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
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*/
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#ifndef CHROMAAB_PCT
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#define CHROMAAB_PCT 1.5
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#endif
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#ifndef CHROMAAB_TYPE
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#define CHROMAAB_TYPE vec3
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#endif
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#ifndef CHROMAAB_SAMPLER_FNC
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#define CHROMAAB_SAMPLER_FNC(TEX, UV) SAMPLER_FNC(TEX, UV)
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#endif
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#ifndef FNC_CHROMAAB
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#define FNC_CHROMAAB
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CHROMAAB_TYPE chromaAB(in SAMPLER_TYPE tex, in vec2 st, in vec2 direction, in vec3 distortion ) {
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vec2 offset = vec2(0.0);
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CHROMAAB_TYPE c = CHROMAAB_TYPE(1.);
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c.r = CHROMAAB_SAMPLER_FNC(tex, st + direction * distortion.r).r;
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c.g = CHROMAAB_SAMPLER_FNC(tex, st + direction * distortion.g).g;
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c.b = CHROMAAB_SAMPLER_FNC(tex, st + direction * distortion.b).b;
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return c;
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}
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CHROMAAB_TYPE chromaAB(in SAMPLER_TYPE tex, in vec2 st, in vec2 offset, in float pct) {
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#ifdef CHROMAAB_CENTER_BUFFER
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// modify the distance from the center, so that only the edges are affected
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offset = max(offset - CHROMAAB_CENTER_BUFFER, 0.);
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#endif
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// Distort the UVs
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vec2 stR = st * (1.0 + offset * 0.02 * pct),
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stB = st * (1.0 - offset * 0.02 * pct);
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// Get the individual channels using the modified UVs
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CHROMAAB_TYPE c = CHROMAAB_TYPE(1.);
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c.r = CHROMAAB_SAMPLER_FNC(tex, stR).r;
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c.g = CHROMAAB_SAMPLER_FNC(tex, st).g;
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c.b = CHROMAAB_SAMPLER_FNC(tex, stB).b;
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return c;
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}
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CHROMAAB_TYPE chromaAB(in SAMPLER_TYPE tex, in vec2 st, in float sdf, in float pct) {
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return chromaAB(tex, st, vec2(sdf), pct);
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}
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CHROMAAB_TYPE chromaAB(in SAMPLER_TYPE tex, in vec2 st, in float sdf) {
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return chromaAB(tex, st, sdf, CHROMAAB_PCT);
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}
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CHROMAAB_TYPE chromaAB(in SAMPLER_TYPE tex, in vec2 st, in vec2 offset) {
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return chromaAB(tex, st, offset, CHROMAAB_PCT);
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}
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CHROMAAB_TYPE chromaAB(in SAMPLER_TYPE tex, in vec2 st) {
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return chromaAB(tex, st, lengthSq(st - .5), CHROMAAB_PCT);
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}
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#endif
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