// MinecraftPT — Ripple
// Rain-induced ripple normal map for water surfaces.

#ifndef RIPPLE_GLSL
uniform sampler2D ripple2D;
#define RIPPLE_GLSL

vec2 GetRippleNormal(vec3 worldPos, float time){
	vec2 coord = worldPos.xz * 0.1;
	vec2 ripple = textureLod(ripple2D, fract(coord + time * 0.02), 0.0).rg;
	return ripple * 2.0 - 1.0;
}

#endif