water_3d.shader

// 3D Water Shader
// From: Mr. Jed's Water Shaders | Part 2

shader_type spatial;

uniform sampler2D alb_texture;
uniform sampler2D flow_texture;

uniform float flow_amt = 0.1;
uniform float duration = 1.0;

uniform vec2 scale = vec2(1.0,1.0);

void fragment(){
	float time = mod(TIME, duration) / duration;
	float time_shift = mod(TIME + duration / 2.0, duration) / duration;
	
	vec2 dir0 = normalize(texture(flow_texture, scale * UV).rg) - vec2(0.5,0.5);
	vec2 flow_uv0 = scale* UV + dir0 * time * flow_amt;
	float alpha0 = 1.0 - abs(1.0 - 2.0 * time);
	
	vec2 dir1 = normalize(texture(flow_texture, scale * UV).rg) - vec2(0.5,0.5);
	vec2 flow_uv1 = scale * UV + dir1 * time_shift * flow_amt;
	float alpha1 = 1.0 - abs(1.0 - 2.0 * time_shift);
	
	vec3 color0 = texture(alb_texture, flow_uv0).rgb;
	vec3 color1 = texture(alb_texture, flow_uv1).rgb;
	
	ALBEDO = (color0 * alpha0 + color1 * alpha1);
	
	ALPHA = 0.56;
}