add to archive

1 files changed, 151 insertions, 0 deletions

diff --git a/FESgui/src/PerlinPhasingFilter.cpp b/FESgui/src/PerlinPhasingFilter.cpp
new file mode 100644
index 0000000..897a776
--- /dev/null
+++ b/FESgui/src/PerlinPhasingFilter.cpp
@@ -0,0 +1,151 @@
+//
+//  PerlinPhasingFilter.cpp
+//  filterSandbox
+//
+//  Created by Matthew Fargo on 2014/06/24.
+//
+//
+
+#include "PerlinPhasingFilter.h"
+
+PerlinPhasingFilter::PerlinPhasingFilter(float width, float height, float scale) : AbstractFilter(width, height) {
+    _name = "Perlin Pixellation";
+    _scale = scale;
+    _addParameter(new ParameterF("fractionalWidthOfPixel", 0.05));
+    _addParameter(new ParameterF("scale", _scale));
+    _addParameter(new ParameterF("phase", 0.0));
+    _setupShader();
+}
+PerlinPhasingFilter::~PerlinPhasingFilter() {}
+
+
+string PerlinPhasingFilter::_getFragSrc() {
+    return GLSL_STRING(120,
+        //precision highp float;
+        uniform sampler2D inputImageTexture;
+        
+        uniform float fractionalWidthOfPixel;
+        uniform float scale;
+        uniform float phase;
+        //
+        // GLSL textureless classic 3D noise "cnoise",
+        // with an RSL-style periodic variant "pnoise".
+        // Author:  Stefan Gustavson (stefan.gustavson@liu.se)
+        // Version: 2011-10-11
+        //
+        // Many thanks to Ian McEwan of Ashima Arts for the
+        // ideas for permutation and gradient selection.
+        //
+        // Copyright (c) 2011 Stefan Gustavson. All rights reserved.
+        // Distributed under the MIT license. See LICENSE file.
+        // 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)+10.0)*x);
+        }
+
+        vec4 taylorInvSqrt(vec4 r)
+        {
+          return 1.79284291400159 - 0.85373472095314 * r;
+        }
+
+        vec3 fade(vec3 t) {
+          return t*t*t*(t*(t*6.0-15.0)+10.0);
+        }
+
+        // Classic Perlin noise
+        float cnoise(vec3 P)
+        {
+          vec3 Pi0 = floor(P); // Integer part for indexing
+          vec3 Pi1 = Pi0 + vec3(1.0); // Integer part + 1
+          Pi0 = mod289(Pi0);
+          Pi1 = mod289(Pi1);
+          vec3 Pf0 = fract(P); // Fractional part for interpolation
+          vec3 Pf1 = Pf0 - vec3(1.0); // Fractional part - 1.0
+          vec4 ix = vec4(Pi0.x, Pi1.x, Pi0.x, Pi1.x);
+          vec4 iy = vec4(Pi0.yy, Pi1.yy);
+          vec4 iz0 = Pi0.zzzz;
+          vec4 iz1 = Pi1.zzzz;
+
+          vec4 ixy = permute(permute(ix) + iy);
+          vec4 ixy0 = permute(ixy + iz0);
+          vec4 ixy1 = permute(ixy + iz1);
+
+          vec4 gx0 = ixy0 * (1.0 / 7.0);
+          vec4 gy0 = fract(floor(gx0) * (1.0 / 7.0)) - 0.5;
+          gx0 = fract(gx0);
+          vec4 gz0 = vec4(0.5) - abs(gx0) - abs(gy0);
+          vec4 sz0 = step(gz0, vec4(0.0));
+          gx0 -= sz0 * (step(0.0, gx0) - 0.5);
+          gy0 -= sz0 * (step(0.0, gy0) - 0.5);
+
+          vec4 gx1 = ixy1 * (1.0 / 7.0);
+          vec4 gy1 = fract(floor(gx1) * (1.0 / 7.0)) - 0.5;
+          gx1 = fract(gx1);
+          vec4 gz1 = vec4(0.5) - abs(gx1) - abs(gy1);
+          vec4 sz1 = step(gz1, vec4(0.0));
+          gx1 -= sz1 * (step(0.0, gx1) - 0.5);
+          gy1 -= sz1 * (step(0.0, gy1) - 0.5);
+
+          vec3 g000 = vec3(gx0.x,gy0.x,gz0.x);
+          vec3 g100 = vec3(gx0.y,gy0.y,gz0.y);
+          vec3 g010 = vec3(gx0.z,gy0.z,gz0.z);
+          vec3 g110 = vec3(gx0.w,gy0.w,gz0.w);
+          vec3 g001 = vec3(gx1.x,gy1.x,gz1.x);
+          vec3 g101 = vec3(gx1.y,gy1.y,gz1.y);
+          vec3 g011 = vec3(gx1.z,gy1.z,gz1.z);
+          vec3 g111 = vec3(gx1.w,gy1.w,gz1.w);
+
+          vec4 norm0 = taylorInvSqrt(vec4(dot(g000, g000), dot(g010, g010), dot(g100, g100), dot(g110, g110)));
+          g000 *= norm0.x;
+          g010 *= norm0.y;
+          g100 *= norm0.z;
+          g110 *= norm0.w;
+          vec4 norm1 = taylorInvSqrt(vec4(dot(g001, g001), dot(g011, g011), dot(g101, g101), dot(g111, g111)));
+          g001 *= norm1.x;
+          g011 *= norm1.y;
+          g101 *= norm1.z;
+          g111 *= norm1.w;
+
+          float n000 = dot(g000, Pf0);
+          float n100 = dot(g100, vec3(Pf1.x, Pf0.yz));
+          float n010 = dot(g010, vec3(Pf0.x, Pf1.y, Pf0.z));
+          float n110 = dot(g110, vec3(Pf1.xy, Pf0.z));
+          float n001 = dot(g001, vec3(Pf0.xy, Pf1.z));
+          float n101 = dot(g101, vec3(Pf1.x, Pf0.y, Pf1.z));
+          float n011 = dot(g011, vec3(Pf0.x, Pf1.yz));
+          float n111 = dot(g111, Pf1);
+
+          vec3 fade_xyz = fade(Pf0);
+          vec4 n_z = mix(vec4(n000, n100, n010, n110), vec4(n001, n101, n011, n111), fade_xyz.z);
+          vec2 n_yz = mix(n_z.xy, n_z.zw, fade_xyz.y);
+          float n_xyz = mix(n_yz.x, n_yz.y, fade_xyz.x); 
+          return 2.2 * n_xyz;
+        }
+
+        void main() {
+            vec2 uv = (gl_TexCoord[0].xy);
+
+            float n = cnoise( vec3(uv,phase) *scale)+
+                      cnoise( vec3(uv,phase) *scale*3.71098f)+
+                      cnoise( vec3(uv,phase) *scale*11.56476f);
+            vec2 sampleDivisor = vec2((((n + 1.0) / 2.0) + 0.5) * fractionalWidthOfPixel);
+            
+            vec2 samplePos = uv - mod(uv, sampleDivisor);
+            gl_FragColor = texture2D(inputImageTexture, samplePos );
+        }
+
+    );
+}