// vertex shader
uniform vec4 LightVec;
varying vec2 uv;
varying vec4 color;
 
void main()
{
  gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

  vec4 n = normalize(vec4(gl_Normal, 1));
  vec4 normalVec = gl_ModelViewProjectionMatrix * n;

  vec4 lightVec = normalize(LightVec);

  float diffuse = max(dot(normalVec, lightVec), 0.2);
       
        color.a = 1;
        color.rgb = vec3(diffuse, diffuse, diffuse);

  uv = gl_MultiTexCoord0.xy;
}

// fragment shader
uniform sampler2D diffuseMap;
varying vec2 uv;
varying vec4 color;

void main()
{
  vec4 res = color * texture2D(diffuseMap, uv);
  gl_FragColor = res;
}

// fragment shader
uniform float rrad;
void main()
{
  vec3 lightdist = gl_TexCoord[0].xyz;
  float t = dot(lightdist, lightdist);
  float light = 1.0 - rrad * sqrt(t);
  gl_FragColor = vec4(light, light, light, 1);
}