Shaders now are managed by a manger that can do hot reloading and it also will detect a bad shader and use an ERROR shader so you know it's busted visually.

shaders/ui_shape_shader.frag

@@ -1,12 +0,0 @@
-uniform vec2 u_resolution;
-uniform vec2 u_mouse;
-uniform float u_duration;
-uniform float u_time;
-uniform float u_time_end;
-
-void main() {
-  float tick = (u_time_end - u_time) / u_duration;
-  float blink = smoothstep(1.0, 0.5, tick);
-  vec4 color = vec4(blink, blink, blink, 1.0);
-  gl_FragColor = gl_Color * color;
-}