1 files changed, 5 insertions, 2 deletions

diff --git a/assets/shaders/ZInvert.frag.glsl b/assets/shaders/ZInvert.frag.glsl
index b1fd1748..1566b881 100644
--- a/assets/shaders/ZInvert.frag.glsl
+++ b/assets/shaders/ZInvert.frag.glsl
@@ -4,6 +4,7 @@ precision highp float;
 
 uniform vec2 u_resolution;
 uniform float u_time;
+uniform float u_speed;
 uniform sampler2D u_tex0;
 
 void main(void)
@@ -11,11 +12,13 @@ void main(void)
     vec2 p = -1.0 + 2.0 * gl_FragCoord.xy / u_resolution.xy;
     vec2 uv;
 
+        float time = u_time * u_speed;
+
     float a = atan(p.y,p.x);
     float r = sqrt(dot(p,p));
 
-    uv.x = cos(0.6+u_time) + cos(cos(1.2+u_time)+a)/r;
-    uv.y = cos(0.3+u_time) + sin(cos(2.0+u_time)+a)/r;
+    uv.x = cos(0.6+time) + cos(cos(1.2+time)+a)/r;
+    uv.y = cos(0.3+time) + sin(cos(2.0+time)+a)/r;
 
     vec3 col =  texture2D(u_tex0,uv*.25).xyz;