shader_type spatial;
render_mode unshaded;

global uniform float time;

const int SCRIBBLES = 4;

uniform sampler2D albedo_texture;
uniform float scribble_switch_speed = 3.0;
uniform float scribble_intensity = 0.05;

group_uniforms ScribbleTextures;
uniform sampler2D scribbles_1 : hint_normal;
uniform sampler2D scribbles_2 : hint_normal;
uniform sampler2D scribbles_3 : hint_normal;
uniform sampler2D scribbles_4 : hint_normal;
uniform sampler2D scribbles_1_1 : hint_normal;
uniform sampler2D scribbles_2_2 : hint_normal;
uniform sampler2D scribbles_3_3 : hint_normal;
uniform sampler2D scribbles_4_4 : hint_normal;

void vertex() {
	// Called for every vertex the material is visible on.
}

void fragment() {
	// Called for every pixel the material is visible on.
	//float duration = scribble_switch_speed * float(SCRIBBLES);
	float wrapped_time = mod(time * scribble_switch_speed, float(SCRIBBLES));
	vec2 uv = UV;

	vec3 scribbles;
	switch (int(wrapped_time))
	{
		case 0:
			scribbles = texture(scribbles_1, UV).rgb;
			break;
		case 1:
			scribbles = texture(scribbles_2, UV).rgb;
			break;
		case 2:
			scribbles = texture(scribbles_3, UV).rgb;
			break;
		case 3:
			scribbles = texture(scribbles_4, UV).rgb;
			break;
	}

	uv.x += (scribbles.x - 0.5) * scribble_intensity;
	uv.y += (scribbles.y - 0.5) * scribble_intensity;

	vec4 albedo = texture(albedo_texture, uv).rgba;
	ALBEDO = albedo.rgb;
	//ALBEDO = scribbles.rgb;
	ALPHA = albedo.a;
}

//void light() {
//	// Called for every pixel for every light affecting the material.
//	// Uncomment to replace the default light processing function with this one.
//}