#include "water_ref.glsl"

out vec4 FragColor;

uniform vec3 uCamera;
uniform vec4 uPlane;

in vec4 aColour;
in vec2 aUv;
in vec3 aNorm;
in vec3 aCo;

float ray_plane( vec3 pos, vec3 dir, vec4 plane )
{
   float d = dot( plane.xyz, dir );
   float t = dot((plane.xyz*plane.w - pos),plane.xyz) / d;
   return t;
}

void main()
{
   float fdist = ray_plane( uCamera, -aNorm, uPlane );
   vec3 world_pos = uCamera - aNorm*fdist;

   FragColor = vec4(fract(world_pos*0.1),1.0);
}