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Implement oklab, oklch color space conversion functions, add example, restructure comments in the shaderlib, implements #37

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ChaoticByte 2025-01-17 16:50:34 +01:00
parent 35959290d3
commit 1a21589fc1
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8 changed files with 127 additions and 34 deletions
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8
shaderlib/blur.gdshaderinc
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@ -1,7 +1,9 @@
// gaussian_blur adapted from https://godotshaders.com/shader/customizable-gausian-blur/
// original code by https://godotshaders.com/author/djbob-gaming-yt/
// maximum radius is 64
/*
gaussian_blur adapted from https://godotshaders.com/shader/customizable-gausian-blur/
original code by https://godotshaders.com/author/djbob-gaming-yt/
maximum radius is 64
*/
vec4 gaussian_blur(sampler2D texture, vec2 uv, int radius, float sigma) {
vec2 resolution = 1.0 / vec2(textureSize(texture, 0));
// calculate kernel

74
shaderlib/colorspaces.gdshaderinc
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@ -1,7 +1,16 @@
// rgb2hsv and hsv2rgb functions adapted
// from https://godotshaders.com/shader/hsv-adjustment/
// original code by https://godotshaders.com/author/al1-ce/
/*
Color space conversion functions always work with vec4.
The fourth value is always alpha.
*/
#include "res://shaderlib/common.gdshaderinc"
/*
rgb2hsv and hsv2rgb functions adapted
from https://godotshaders.com/shader/hsv-adjustment/
original code by https://godotshaders.com/author/al1-ce/
*/
// Convert RGB to HSV (hue, saturation, brightness)
vec4 rgb2hsv(vec4 c) {
@ -20,3 +29,62 @@ vec4 hsv2rgb(vec4 c) {
vec3 rgb = c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
return vec4(rgb.r, rgb.g, rgb.b, c.a);
}
/*
OkLab and OkLCh
For more details on oklab, see
- https://bottosson.github.io/posts/oklab/
- https://en.wikipedia.org/wiki/Oklab_color_space
*/
vec4 rgb2oklab(vec4 c) {
float l = 0.4122214708f * c.r + 0.5363325363f * c.g + 0.0514459929f * c.b;
float m = 0.2119034982f * c.r + 0.6806995451f * c.g + 0.1073969566f * c.b;
float s = 0.0883024619f * c.r + 0.2817188376f * c.g + 0.6299787005f * c.b;
float l_ = cbrt(l);
float m_ = cbrt(m);
float s_ = cbrt(s);
return vec4(
0.2104542553f*l_ + 0.7936177850f*m_ - 0.0040720468f*s_,
1.9779984951f*l_ - 2.4285922050f*m_ + 0.4505937099f*s_,
0.0259040371f*l_ + 0.7827717662f*m_ - 0.8086757660f*s_,
c.a
);
}
vec4 oklab2rgb(vec4 c) {
float l_ = c.x + 0.3963377774f * c.y + 0.2158037573f * c.z;
float m_ = c.x - 0.1055613458f * c.y - 0.0638541728f * c.z;
float s_ = c.x - 0.0894841775f * c.y - 1.2914855480f * c.z;
float l = l_*l_*l_;
float m = m_*m_*m_;
float s = s_*s_*s_;
return vec4(
+4.0767416621f * l - 3.3077115913f * m + 0.2309699292f * s,
-1.2684380046f * l + 2.6097574011f * m - 0.3413193965f * s,
-0.0041960863f * l - 0.7034186147f * m + 1.7076147010f * s,
c.a
);
}
vec4 oklab2oklch(vec4 c) {
return vec4(
c.x,
sqrt((c.y * c.y) + (c.z * c.z)),
atan(c.z, c.y),
c.a
);
}
vec4 oklch2oklab(vec4 c) {
return vec4(
c.x,
c.y * cos(c.z),
c.y * sin(c.z),
c.a
);
}

5
shaderlib/common.gdshaderinc Normal file
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@ -0,0 +1,5 @@
// inefficient cuberoot function
float cbrt(float x) {
return pow(x, 1.0/3.0);
}

48
shaderlib/denoise.gdshaderinc
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@ -1,32 +1,34 @@
/* glslSmartDenoise by Michele Morrone, adapted
original code: https://github.com/BrutPitt/glslSmartDeNoise
license of the original code:
BSD 2-Clause License
/*
glslSmartDenoise by Michele Morrone, adapted
original code: https://github.com/BrutPitt/glslSmartDeNoise
license of the original code:
Copyright (c) 2019-2020 Michele Morrone
All rights reserved.
BSD 2-Clause License
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
Copyright (c) 2019-2020 Michele Morrone
All rights reserved.
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define INV_SQRT_OF_2PI 0.39894228040143267793994605993439 // 1.0/SQRT_OF_2PI

6
shaderlib/transform.gdshaderinc
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@ -1,6 +1,8 @@
// Load in a texture from a sampler2D with an offset and scale
// See examples/place_texture.gdshader
/*
Load in a texture from a sampler2D with an offset and scale
See examples/place_texture.gdshader
*/
vec4 place_texture(sampler2D sampler, vec2 uv, vec2 texture_pixel_size, vec2 offset, vec2 scale) {
vec2 texture_size = vec2(textureSize(sampler, 0));
// position of current pixel; sample color c

6
shaderlib/transparency.gdshaderinc
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@ -1,6 +1,8 @@
// Alpha Blending a over b after Bruce A. Wallace
// source: https://en.wikipedia.org/wiki/Alpha_compositing
/*
Alpha Blending a over b after Bruce A. Wallace
source: https://en.wikipedia.org/wiki/Alpha_compositing
*/
vec4 alpha_blend(vec4 b, vec4 a) {
float alpha = a.a + (b.a * (1.0 - a.a));
vec3 col = ((a.rgb*a.a) + ((b.rgb*b.a) * (1.0 - a.a)) / alpha);