Add a Perturb filter to orx-fx
This commit is contained in:
Edwin Jakobs
72
orx-fx/src/main/kotlin/distort/Perturb.kt
Normal file
72
orx-fx/src/main/kotlin/distort/Perturb.kt
Normal file
@@ -0,0 +1,72 @@
|
||||
package org.openrndr.extra.fx.distort
|
||||
|
||||
import org.openrndr.draw.*
|
||||
import org.openrndr.extra.fx.filterFragmentCode
|
||||
import org.openrndr.extra.parameters.Description
|
||||
import org.openrndr.extra.parameters.DoubleParameter
|
||||
import org.openrndr.extra.parameters.IntParameter
|
||||
import org.openrndr.math.Vector3
|
||||
import org.openrndr.math.Vector4
|
||||
|
||||
@Description("Perturb")
|
||||
class Perturb : Filter(Shader.createFromCode(filterVertexCode, filterFragmentCode("distort/perturb.frag"))) {
|
||||
var seed: Vector3 by parameters
|
||||
|
||||
/**
|
||||
* base noise scale, default is Vector3(1.0, 1.0, 1.0)
|
||||
*/
|
||||
@DoubleParameter("scale", 0.01, 8.0)
|
||||
var scale: Double by parameters
|
||||
|
||||
@DoubleParameter("phase", -2.0, 2.0)
|
||||
var phase: Double by parameters
|
||||
|
||||
/**
|
||||
* lacunarity is the amount by which scale is modulated per octave, default is Vector3(2.0, 2.0, 2.0)
|
||||
*/
|
||||
@DoubleParameter("lacunarity", 0.0, 1.0)
|
||||
var lacunarity: Double by parameters
|
||||
|
||||
@DoubleParameter("gain", 0.0, 1.0)
|
||||
var gain: Double by parameters
|
||||
|
||||
@DoubleParameter("decay", 0.0, 1.0)
|
||||
var decay: Double by parameters
|
||||
|
||||
/**
|
||||
* the number of octaves of noise to generate, default is 4
|
||||
*/
|
||||
@IntParameter("octaves", 1, 10)
|
||||
var octaves: Int by parameters
|
||||
|
||||
|
||||
@IntParameter("x segments", 0, 256)
|
||||
var xSegments: Int by parameters
|
||||
|
||||
@IntParameter("y segments", 0, 256)
|
||||
var ySegments: Int by parameters
|
||||
|
||||
|
||||
|
||||
init {
|
||||
seed = Vector3.ZERO
|
||||
scale = 1.0
|
||||
lacunarity = 2.0
|
||||
gain = 0.5
|
||||
decay = 0.5
|
||||
octaves = 4
|
||||
phase = 0.0
|
||||
xSegments = 0
|
||||
ySegments = 0
|
||||
|
||||
}
|
||||
var bicubicFiltering = true
|
||||
override fun apply(source: Array<ColorBuffer>, target: Array<ColorBuffer>) {
|
||||
if (bicubicFiltering && source.isNotEmpty()) {
|
||||
source[0].generateMipmaps()
|
||||
source[0].filter(MinifyingFilter.LINEAR_MIPMAP_LINEAR, MagnifyingFilter.LINEAR)
|
||||
}
|
||||
super.apply(source, target)
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,170 @@
|
||||
#version 330
|
||||
|
||||
// uniforms
|
||||
uniform float gain;
|
||||
uniform vec3 seed;
|
||||
uniform float phase;
|
||||
uniform float scale;
|
||||
|
||||
uniform float lacunarity;
|
||||
uniform float decay;
|
||||
|
||||
uniform int octaves;
|
||||
uniform sampler2D tex0;
|
||||
|
||||
uniform int xSegments;
|
||||
uniform int ySegments;
|
||||
|
||||
// varyings
|
||||
in vec2 v_texCoord0;
|
||||
|
||||
// outputs
|
||||
out vec4 o_output;
|
||||
|
||||
// Simplex Noise 3D Implementation
|
||||
// Description : Array and textureless GLSL 2D/3D/4D simplex
|
||||
// noise functions.
|
||||
// Author : Ian McEwan, Ashima Arts.
|
||||
// Maintainer : ijm
|
||||
// Lastmod : 20110822 (ijm)
|
||||
// License : Copyright (C) 2011 Ashima Arts. All rights reserved.
|
||||
// Distributed under the MIT License. See LICENSE file.
|
||||
// https://github.com/ashima/webgl-noise
|
||||
// https://github.com/stegu/webgl-noise
|
||||
//
|
||||
//
|
||||
vec3 mod289(vec3 x) {
|
||||
return x - floor(x * (1.0 / 289.0)) * 289.0;
|
||||
}
|
||||
|
||||
vec4 mod289(vec4 x) {
|
||||
return x - floor(x * (1.0 / 289.0)) * 289.0;
|
||||
}
|
||||
|
||||
vec4 permute(vec4 x) {
|
||||
return mod289(((x*34.0)+1.0)*x);
|
||||
}
|
||||
|
||||
vec4 taylorInvSqrt(vec4 r)
|
||||
{
|
||||
return 1.79284291400159 - 0.85373472095314 * r;
|
||||
}
|
||||
|
||||
float snoise(vec3 v)
|
||||
{
|
||||
const vec2 C = vec2(1.0/6.0, 1.0/3.0) ;
|
||||
const vec4 D = vec4(0.0, 0.5, 1.0, 2.0);
|
||||
|
||||
// First corner
|
||||
vec3 i = floor(v + dot(v, C.yyy) );
|
||||
vec3 x0 = v - i + dot(i, C.xxx) ;
|
||||
|
||||
// Other corners
|
||||
vec3 g = step(x0.yzx, x0.xyz);
|
||||
vec3 l = 1.0 - g;
|
||||
vec3 i1 = min( g.xyz, l.zxy );
|
||||
vec3 i2 = max( g.xyz, l.zxy );
|
||||
|
||||
// x0 = x0 - 0.0 + 0.0 * C.xxx;
|
||||
// x1 = x0 - i1 + 1.0 * C.xxx;
|
||||
// x2 = x0 - i2 + 2.0 * C.xxx;
|
||||
// x3 = x0 - 1.0 + 3.0 * C.xxx;
|
||||
vec3 x1 = x0 - i1 + C.xxx;
|
||||
vec3 x2 = x0 - i2 + C.yyy; // 2.0*C.x = 1/3 = C.y
|
||||
vec3 x3 = x0 - D.yyy; // -1.0+3.0*C.x = -0.5 = -D.y
|
||||
|
||||
// Permutations
|
||||
i = mod289(i);
|
||||
vec4 p = permute( permute( permute(
|
||||
i.z + vec4(0.0, i1.z, i2.z, 1.0 ))
|
||||
+ i.y + vec4(0.0, i1.y, i2.y, 1.0 ))
|
||||
+ i.x + vec4(0.0, i1.x, i2.x, 1.0 ));
|
||||
|
||||
// Gradients: 7x7 points over a square, mapped onto an octahedron.
|
||||
// The ring size 17*17 = 289 is close to a multiple of 49 (49*6 = 294)
|
||||
float n_ = 0.142857142857; // 1.0/7.0
|
||||
vec3 ns = n_ * D.wyz - D.xzx;
|
||||
|
||||
vec4 j = p - 49.0 * floor(p * ns.z * ns.z); // mod(p,7*7)
|
||||
|
||||
vec4 x_ = floor(j * ns.z);
|
||||
vec4 y_ = floor(j - 7.0 * x_ ); // mod(j,N)
|
||||
|
||||
vec4 x = x_ *ns.x + ns.yyyy;
|
||||
vec4 y = y_ *ns.x + ns.yyyy;
|
||||
vec4 h = 1.0 - abs(x) - abs(y);
|
||||
|
||||
vec4 b0 = vec4( x.xy, y.xy );
|
||||
vec4 b1 = vec4( x.zw, y.zw );
|
||||
|
||||
//vec4 s0 = vec4(lessThan(b0,0.0))*2.0 - 1.0;
|
||||
//vec4 s1 = vec4(lessThan(b1,0.0))*2.0 - 1.0;
|
||||
vec4 s0 = floor(b0)*2.0 + 1.0;
|
||||
vec4 s1 = floor(b1)*2.0 + 1.0;
|
||||
vec4 sh = -step(h, vec4(0.0));
|
||||
|
||||
vec4 a0 = b0.xzyw + s0.xzyw*sh.xxyy ;
|
||||
vec4 a1 = b1.xzyw + s1.xzyw*sh.zzww ;
|
||||
|
||||
vec3 p0 = vec3(a0.xy,h.x);
|
||||
vec3 p1 = vec3(a0.zw,h.y);
|
||||
vec3 p2 = vec3(a1.xy,h.z);
|
||||
vec3 p3 = vec3(a1.zw,h.w);
|
||||
|
||||
//Normalise gradients
|
||||
vec4 norm = taylorInvSqrt(vec4(dot(p0,p0), dot(p1,p1), dot(p2, p2), dot(p3,p3)));
|
||||
p0 *= norm.x;
|
||||
p1 *= norm.y;
|
||||
p2 *= norm.z;
|
||||
p3 *= norm.w;
|
||||
|
||||
// Mix final noise value
|
||||
vec4 m = max(0.6 - vec4(dot(x0,x0), dot(x1,x1), dot(x2,x2), dot(x3,x3)), 0.0);
|
||||
m = m * m;
|
||||
return 42.0 * dot( m*m, vec4( dot(p0,x0), dot(p1,x1),
|
||||
dot(p2,x2), dot(p3,x3) ) );
|
||||
}
|
||||
|
||||
vec3 segment(vec3 t, int x, int y) {
|
||||
|
||||
float sx = x == 0? t.x : floor(t.x * x) / x;
|
||||
float sy = y == 0? t.y : floor(t.y * y) / y;
|
||||
|
||||
return vec3(sx,sy, t.z);
|
||||
}
|
||||
|
||||
void main() {
|
||||
float tx = 0.0;
|
||||
float ty = 0.0;
|
||||
|
||||
float _gain = gain;
|
||||
float shift = 100.0;
|
||||
|
||||
vec3 xseed = vec3(seed.xy, seed.z+cos(phase*3.1415926535));
|
||||
vec3 yseed = vec3(seed.yx, seed.z+sin(phase*3.1415926535));
|
||||
|
||||
vec3 uv = vec3(v_texCoord0, 1.0) * 2.0 - 1.0;
|
||||
vec3 px = ((segment(uv, xSegments, ySegments) + xseed) * scale);
|
||||
vec3 py = ((segment(uv, xSegments, ySegments) + yseed + vec3(100.37, 40.51, 9.43)) * scale);
|
||||
|
||||
for (int o = 0; o < octaves; ++o) {
|
||||
tx += snoise(px) * _gain;
|
||||
ty += snoise(py) * _gain;
|
||||
px = px * lacunarity + shift;
|
||||
py = py * lacunarity + shift;
|
||||
_gain *= decay;
|
||||
}
|
||||
|
||||
vec2 distCoord = v_texCoord0 + vec2(tx, ty);
|
||||
|
||||
if (distCoord.x >= 0.0 && distCoord.y >= 0.0 && distCoord.x < 1.0 && distCoord.y < 1.0) {
|
||||
|
||||
if (xSegments == 0 && ySegments == 0) {
|
||||
o_output = texture(tex0, distCoord);
|
||||
} else {
|
||||
o_output = textureLod(tex0, distCoord, 0.0);
|
||||
}
|
||||
} else {
|
||||
o_output = vec4(0.0);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user