1 files changed, 50 insertions, 0 deletions
diff --git a/src/main/resources/assets/notenoughupdates/shaders/capes/tunnel/tunnel.frag b/src/main/resources/assets/notenoughupdates/shaders/capes/tunnel/tunnel.frag
new file mode 100644
index 00000000..fa3455ce
--- /dev/null
+++ b/src/main/resources/assets/notenoughupdates/shaders/capes/tunnel/tunnel.frag
@@ -0,0 +1,50 @@
+#version 120
+
+varying vec4 passColour;
+varying vec3 passNormal;
+uniform sampler2D textureIn;
+
+uniform int millis;
+
+//Algorithm by hughsk
+vec3 hsv2rgb(vec3 c) {
+  vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
+  vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
+  return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
+}
+
+void main()
+{
+    float num = 5.0;
+
+    vec2 uv = vec2(gl_TexCoord[0].s*1024.0/300.0, gl_TexCoord[0].t*1024.0/420.0);
+
+    float timeMod = mod(millis/1000.0/num, 1.0/num);
+
+    if(uv.x > 1.5 || uv.y > 1) {
+        vec3 rgb = hsv2rgb(vec3((-1.0/num-millis/1000.0/num+timeMod)/2.0, 0.6, 0.8)) * 1.4;
+        gl_FragColor = vec4(rgb, 1.0);
+        return;
+    }
+
+    float xDist = 1.0 - min(uv.x, 1.0 - uv.x)*2.0;
+    float yDist = 1.0 - min(uv.y, 1.0 - uv.y)*2.0;
+    //float a = 20.0;
+    //float edgeDist = 1.0 - pow(pow(xDist, a) + pow(yDist, a), 1.0/a);
+    float edgeDist = 1.0 - max(xDist, yDist);
+
+    edgeDist += 0.2;
+    edgeDist *= edgeDist;
+    edgeDist -= timeMod;
+
+    float factor = 1.0 - mod(edgeDist*num, 1.0);
+    factor *= factor*factor;
+    factor = 1.4 - factor;
+    factor = max(0.8, factor);
+
+    edgeDist = floor(edgeDist*num)/num;
+
+    vec3 rgb = hsv2rgb(vec3((edgeDist-millis/1000.0/num+timeMod)/2.0, 0.6, 0.8));
+
+    gl_FragColor = vec4(rgb*factor, 1.0);
+}