lygia
/v1.1.6
/morphological
/dilation
)morphological dilation operation. Based on: https://lettier.github.io/3d-game-shaders-for-beginners/dilation.html https://www.shadertoy.com/view/WsyXWc
Dependencies:
Use:
dilation(<SAMPLER_TYPE> texture, <float2> st, <float2> pixels_scale, <int> passes)
#ifndef DILATION_TYPE
#define DILATION_TYPE float
#endif
#ifndef DILATION_SAMPLE_FNC
#define DILATION_SAMPLE_FNC(TEX, UV) SAMPLER_FNC(TEX, UV).r
#endif
#ifndef FNC_DILATE
#define FNC_DILATE
DILATION_TYPE dilation(SAMPLER_TYPE tex, vec2 st, vec2 pixel, int radius) {
float invKR = 1.0 / float(radius);
DILATION_TYPE acc = DILATION_TYPE(0.0);
float w = 0.0;
for(int i = -radius; i <= radius; ++i)
for(int j = -radius; j <= radius; ++j) {
vec2 rxy = vec2(ivec2(i, j));
vec2 kst = rxy * invKR * 2.0;
vec2 texOffset = st + rxy * pixel;
float kernel = saturate(1.0 - dot(kst, kst));
DILATION_TYPE t = DILATION_SAMPLE_FNC(tex, texOffset);
DILATION_TYPE v = t + kernel;
if (sum(v) > sum(acc)) {
acc = v;
w = kernel;
}
}
return acc - w;
}
#endif
Dependencies:
Use:
dilation(<SAMPLER_TYPE> texture, <float2> st, <float2> pixels_scale, <int> passes)
#ifndef DILATION_TYPE
#define DILATION_TYPE float
#endif
#ifndef DILATION_SAMPLE_FNC
#define DILATION_SAMPLE_FNC(TEX, UV) SAMPLER_FNC(TEX, UV).x
#endif
#ifndef FNC_DILATE
#define FNC_DILATE
DILATION_TYPE dilation(SAMPLER_TYPE tex,float2 st,float2 pixel, int radius) {
float invKR = 1.0 / float(radius);
DILATION_TYPE acc = DILATION_TYPE(0.0);
float w = 0.0;
for(int i = -radius; i <= radius; ++i)
for(int j = -radius; j <= radius; ++j) {
float2 rxy = float2(float(i), float(j));
float2 kst = rxy * invKR;
float2 texOffset = st + rxy * pixel;
float kernel = saturate(1.0 - dot(kst, kst));
DILATION_TYPE t = DILATION_SAMPLE_FNC(tex, texOffset);
DILATION_TYPE v = t + kernel;
if (sum(v) > sum(acc)) {
acc = v;
w = kernel;
}
}
return acc - w;
}
#endif
LYGIA is dual-licensed under the Prosperity License and the Patron License for sponsors and contributors.
Sponsors and contributors are automatically added to the Patron License and they can ignore the any non-commercial rule of the Prosperity Licensed software (please take a look to the exception).
It's also possible to get a permanent comercial license hook to a single and specific version of LYGIA.
Sign up for the news letter bellow, joing the LYGIA's channel on Discord or follow the Github repository