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new way for hash generation #180

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merged 2 commits into from
Jan 7, 2019
Merged

new way for hash generation #180

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783a961
1, use new way to generate hash, old one does not work on iOS devices…
jcyuan Jan 4, 2019
4459879
Merge branch 'master' into master
bigtimebuddy Jan 7, 2019
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12 changes: 7 additions & 5 deletions filters/zoom-blur/src/zoom-blur.frag
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Original file line number Diff line number Diff line change
Expand Up @@ -9,9 +9,11 @@ uniform float uRadius;

const float MAX_KERNEL_SIZE = 32.0;

float random(vec3 scale, float seed) {
// use the fragment position for a different seed per-pixel
return fract(sin(dot(gl_FragCoord.xyz + seed, scale)) * 43758.5453 + seed);
// author: http://byteblacksmith.com/improvements-to-the-canonical-one-liner-glsl-rand-for-opengl-es-2-0/
highp float rand(vec2 co, float seed) {
const highp float a = 12.9898, b = 78.233, c = 43758.5453;
highp float dt = dot(co + seed, vec2(a, b)), sn = mod(dt, 3.14159);
return fract(sin(sn) * c + seed);
}

void main() {
Expand Down Expand Up @@ -52,7 +54,7 @@ void main() {
}

// randomize the lookup values to hide the fixed number of samples
float offset = random(vec3(12.9898, 78.233, 151.7182), 0.0);
float offset = rand(vTextureCoord, 0.0);

float total = 0.0;
vec4 color = vec4(0.0);
Expand All @@ -78,7 +80,7 @@ void main() {

color /= total;
// switch back from pre-multiplied alpha
color.rgb /= color.a + 0.00001;
// color.rgb /= color.a + 0.00001;

gl_FragColor = color;
}