1 files changed, 21 insertions, 0 deletions

diff --git a/assets/shaders/SquareTunnel.frag.glsl b/assets/shaders/SquareTunnel.frag.glsl
new file mode 100644
index 00000000..51ef7b7c
--- /dev/null
+++ b/assets/shaders/SquareTunnel.frag.glsl
@@ -0,0 +1,21 @@
+#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 r = pow( pow(p.x*p.x,16.0) + pow(p.y*p.y,16.0), 1.0/32.0 );
+    uv.x = .5*u_time + 0.5/r;
+    uv.y = 1.0*atan(p.y,p.x)/3.1416;
+
+    vec3 col =  texture2D(u_tex0,uv).xyz;
+
+    gl_FragColor = vec4(col*r*r*r,1.0);
+}