#if PUDDLES == 1
float GetPuddles(vec3 pos){
	pos=(pos+cameraPosition)*.005;
	
	float noise=texture2D(noisetex,pos.xz).r;
	noise+=texture2D(noisetex,pos.xz*.5).r*2.;
	noise+=texture2D(noisetex,pos.xz*.25).r*4.;
	noise+=texture2D(noisetex,pos.xz*.125).r*8.;
	noise+=texture2D(noisetex,pos.xz*.0625).r*16.;
	noise=max(abs(noise-15.5)*.8-1.2,0.)*wetness;
	noise/=sqrt(noise*noise+1.);
	
	return clamp(noise,0.,.95);
}
#endif

#if PUDDLES == 2
float GetPuddles(vec3 pos){
	pos=(pos+cameraPosition)*.005;
	
	float noise = texture2D(noisetex, pos.xz).x;
	noise += texture2D(noisetex, pos.xz * 6.0).x / 2.0;
    noise += texture2D(noisetex, pos.xz * 5.0).x / 3.0;
	noise += texture2D(noisetex, pos.xz * 4.0).x / 4.0;
	
	return clamp(noise - mix(1.3, 0.4, wetness), 0.0, 1.0);
}
#endif

vec4 cubic(float v)
{
    vec4 n = vec4(1.0, 2.0, 3.0, 4.0) - v;
    vec4 s = n * n * n;
    float x = s.x;
    float y = s.y - 4.0 * s.x;
    float z = s.z - 4.0 * s.y + 6.0 * s.x;
    float w = 6.0 - x - y - z;
    return vec4(x, y, z, w) * (1.0/6.0);
}
vec4 textureBicubic(sampler2D sampler, vec2 coord){

   float texSize = 512.0;
   float invTexSize = 1.0 / texSize;

   coord = coord * texSize - 0.5;


    vec2 fxy = fract(coord);
    coord -= fxy;

    vec4 xcubic = cubic(fxy.x);
    vec4 ycubic = cubic(fxy.y);

    vec4 c = coord.xxyy + vec2 (-0.5, +1.5).xyxy;

    vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);
    vec4 offset = c + vec4 (xcubic.yw, ycubic.yw) / s;

    offset *= invTexSize;

    vec4 sample0 = texture2D(sampler, offset.xz);
    vec4 sample1 = texture2D(sampler, offset.yz);
    vec4 sample2 = texture2D(sampler, offset.xw);
    vec4 sample3 = texture2D(sampler, offset.yw);

    float sx = s.x / (s.x + s.y);
    float sy = s.z / (s.z + s.w);

    return mix(
       mix(sample3, sample2, sx), mix(sample1, sample0, sx), sy);
}


float puddleH(vec3 pos, vec3 fpos) {
	float noise = 0;
	pos = pos + cameraPosition;

	float mult = sqrt(-dot(normalize(normal), normalize(fpos))) /
				 sqrt(sqrt(max(length(pos), 4.0)));
	
	if (mult > 0.01) {
		noise = textureBicubic(noisetex,pos.xz / puddleAmplitude).b;
	}

	noise = sin((noise + frametime) * puddleSpeed) * puddleNoiseReflection + 0.1;
	noise *= mult;

	return noise;
}

vec3 GetPuddleNormal(vec3 pos, vec3 fpos, mat3 tbn) {
    float deltaPos = 0.05;
    float h0 = puddleH(pos, fpos.xyz);
    float h1 = puddleH(pos + vec3( deltaPos, 0.0, 0.0), fpos.xyz);
    float h2 = puddleH(pos + vec3(-deltaPos, 0.0, 0.0), fpos.xyz);
    float h3 = puddleH(pos + vec3(0.0, 0.0,  deltaPos), fpos.xyz);
    float h4 = puddleH(pos + vec3(0.0, 0.0, -deltaPos), fpos.xyz);
    
    float xDelta = ((h1 - h0) + (h0 - h2)) / deltaPos;
    float yDelta = ((h3 - h0) + (h0 - h4)) / deltaPos;
    
    vec3 pnormalMap = vec3(xDelta, yDelta, 1.0 - (xDelta * xDelta + yDelta * yDelta));
    float bumpmult = 0.03;	
    pnormalMap = pnormalMap * vec3(bumpmult, bumpmult, bumpmult) + vec3(0.0, 0.0, 1.0 - bumpmult);

    return clamp(normalize(pnormalMap * tbn),vec3(-1.0),vec3(1.0));
}