Shader on TextureButton texture state

[system]

	Attention	Topic was automatically imported from the old Question2Answer platform.
	Asked By	jospic
	Old Version	Published before Godot 3 was released.

Hi,
is possible to make a shader on a texture button state (hover, pressed, etc, ) ?
Thanks in advance.
-j

[system]

	Reply From:	twinpixel

• Create a custom theme
• Add the class items you need, e.g. a button
• set a certain background color for each state (maybe light green = hover, pink = focus, etc.)
• add a shader to the button, that only affects the pixels that have the proper color, for example a whirl-shader like this:

uniform float frequency=60;
uniform float depth = 0.005;

vec2 uv = SCREEN_UV;
uv.x += sin(uv.y*frequency+TIME*1.4)*depth;
uv.x = clamp(uv.x,0,1);
vec3 c = texscreen(uv);
c=vec3(0.02)/c+c;

if (COLOR.rgb == vec3(1, 0, 1)) 
	{
	COLOR.rgb = c;
	}

you will get something like this: I used pink for the focus state (vec3(1, 0, 1)).