Merge branch 'refs/heads/master' into local-storage-version

1 files changed, 23 insertions, 0 deletions

diff --git a/assets/shaders/Twist.frag.glsl b/assets/shaders/Twist.frag.glsl
new file mode 100644
index 00000000..b7477747
--- /dev/null
+++ b/assets/shaders/Twist.frag.glsl
@@ -0,0 +1,23 @@
+#ifdef GL_ES
+precision highp float;
+#endif
+
+uniform vec2 u_resolution;
+uniform float u_time;
+uniform sampler2D u_tex0;
+
+void main(void)
+{
+    vec2 p = -1.0 + 2.0 * gl_FragCoord.xy / u_resolution.xy;
+    vec2 uv;
+   
+    float a = atan(p.y,p.x);
+    float r = sqrt(dot(p,p));
+
+    uv.x = r - .25*u_time;
+    uv.y = cos(a*5.0 + 2.0*sin(u_time+7.0*r)) ;
+
+    vec3 col =  (.5+.5*uv.y)*texture2D(u_tex0,uv).xyz;
+
+    gl_FragColor = vec4(col,1.0);
+}
\ No newline at end of file