Ripple effect

Made in version 4 beta 8

Shader code

shader_type canvas_item;
uniform vec3 color: source_color; 
uniform float num_cells: hint_range(2.0, 20.0, 1.0)=10.0; 
uniform float speed: hint_range(0.1,2.0, 0.01)=1.0;
uniform float smoothness: hint_range(0.5, 2.0, 0.01)=1.0; 
uniform float angle: hint_range(0.0, 360.0)=45.0; 

float rectanglef (vec2 uv, float width, float height, float feather){
	vec2 uv_cartesian = uv * 2.0 - 1.0; 
	vec2 uv_reflected = abs(uv_cartesian); 
	float dfx = smoothstep(width,width+feather,uv_reflected.x);
	float dfy = smoothstep(height,height+feather,uv_reflected.y); 
	return max(dfx,dfy); 
}

vec2 rotation ( vec2 uv, vec2 center, float ang){
	mat2 rotation = mat2(
					vec2(cos(ang), -sin(ang)), 
					vec2(sin(ang), cos(ang))
					);
	uv -= center; 
	uv *= rotation; 
	uv += center; 
	return uv; 				 
}

void fragment(){	
	
	vec2 igrid = floor(UV * num_cells)/num_cells;

	igrid = rotation(igrid, vec2(0.5), angle * PI/180.0); 
	igrid.x += 2.0 - mod(TIME*speed,4.0); 
	vec2 fgrid = fract(UV * num_cells); 
	float rect_mask = rectanglef(igrid, 0.001,2.0,smoothness); 
	float grid_mask = 1.0 - rectanglef(fgrid,rect_mask,rect_mask,0.0); 
	float outline_mask = 1.0 - rectanglef(fgrid,rect_mask+0.1,rect_mask+0.1,0.0) - grid_mask; 
	vec3 outline = outline_mask * color; 
	vec3 tex = texture(TEXTURE,UV).rgb; 
	vec3 output = mix(tex,outline,outline_mask); 
	COLOR = vec4(output,outline_mask + grid_mask); 
	
}

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