out vec4 FragColor;

uniform vec3 uCamera;
uniform vec3 uBoard0;
uniform vec3 uBoard1;

#include "light_clearskies_stddef.glsl"
#include "common_scene.glsl"

// Water blending
// ==============

float water_depth( vec3 pos, vec3 halfview )
{
   vec3 pnorm = g_water_plane.xyz;
   float pdist = g_water_plane.w;

   float d = dot( pnorm, halfview );
   float t = dot((pnorm*pdist - pos), pnorm) / d;

   // TODO: Make g_water_fog a material param
   return t * 0.3;//g_water_fog;
}

void main()
{
   vec3 halfview = normalize( uCamera - aWorldCo );
   float depth = water_depth( aWorldCo, halfview );
   FragColor = vec4( depth, 0.0, 0.0, 0.0 );
}