shader_type canvas_item;
render_mode unshaded;

uniform sampler2D screen_texture : hint_screen_texture, repeat_disable, filter_nearest;
uniform vec2 extent = vec2(1.0);
uniform vec2 center = vec2(0.5);
uniform float progress : hint_range(0.0, 1.0) = 0.0;

void fragment() {
	vec2 delta = (UV - center) * extent;
	float distance_px = length(delta);
	float radius = progress * length(extent);
	float band = 1.0 - smoothstep(0.0, 28.0, abs(distance_px - radius));
	float fade = 1.0 - progress;
	vec2 direction = delta / max(distance_px, 1.0);
	vec2 offset = direction * sin((distance_px - radius) * 0.18) * band * 4.0 * fade * SCREEN_PIXEL_SIZE;
	vec4 scene = texture(screen_texture, SCREEN_UV + offset);
	scene.rgb += vec3(0.18, 0.28, 0.22) * band * fade;
	COLOR = vec4(scene.rgb, 1.0);
}