shader_type canvas_item;

uniform sampler2D ripples: repeat_enable;
uniform float warp;
uniform float time_scale = 0.1f;

vec3 hmap_normal(sampler2D hmap, vec2 uv) {
	float eps = 0.01f;
	float z = texture(hmap, uv).z;
	return normalize(vec3(
		(texture(hmap, uv + vec2(eps, 0)).z - z) / eps,
		(texture(hmap, uv + vec2(0, eps)).z - z) / eps,
		-1
	));
}

void fragment() {
	//vec3 normal = texture(ripples, UV + vec2(TIME * time_scale, 0)).xyz;
	vec3 normal = hmap_normal(ripples, UV + vec2(TIME * time_scale, 0));
	vec4 col = texture(TEXTURE, UV + normal.xy * warp).rgba;
	COLOR.rgb = col.rgb;
}