#version 410

in vec3 Position;
in vec3 Normal;
in vec2 TexCoord;

uniform mat4 ViewMatrix;

struct LightInfo {
  vec3 Ldir;
  vec3 La;
  vec3 Ld;
  vec3 Ls;
};
uniform LightInfo Light;

struct MaterialInfo{
  vec3 Ka;
  vec3 Kd;
  vec3 Ks;
  float Shininess;
};
uniform MaterialInfo Material;
uniform sampler2D BaseTex;;

layout( location = 0 ) out vec4 Ambient;
layout( location = 1 ) out vec4 DiffSpec;

void shade( )
{
  vec4 s4 = ViewMatrix*vec4(Light.Ldir, 0.0);
  vec3 n = normalize(Normal);
  vec3 v = normalize(-Position);
  vec3 s = normalize(-vec3(s4));
  vec3 r = reflect(-s, n);
  float dRate = max(dot(s, n), 0.0);
  float sRate = pow(max(dot(r, v), 0.0), Material.Shininess);

  vec4 texColor = texture(BaseTex, TexCoord);


  Ambient = vec4(texColor.rgb*Light.La * Material.Ka, 1.0);
  DiffSpec = vec4( texColor.rgb* Light.Ld * Material.Kd * dRate + Light.Ls * Material.Ks * sRate, 1.0);
}

void main() {
    shade();
}