#ifdef GL_ES
precision mediump float;
#endif

varying vec2      v_texCoord;
varying vec4      v_v2Position;

uniform sampler2D u_texture;
uniform vec2      u_v2LightPositions[8];
uniform int       u_iLightStatus[8];
uniform float     u_fRadiusSquared[8];


void main()
{
  vec4 currentTexelColor = texture2D(u_texture, v_texCoord);

  float gray = dot(currentTexelColor.rgb, vec3( 0.299, 0.587, 0.114 ) );

  for(int i = 0; i < 8; i++)
  {
      float fDistance_x = v_v2Position.x - u_v2LightPositions[i].x;
      float fDistance_y = v_v2Position.y - u_v2LightPositions[i].y;
      if( ( u_iLightStatus[i] == 1 ) && (fDistance_x * fDistance_x ) + (fDistance_y * fDistance_y ) < u_fRadiusSquared[i] )
      {
          gl_FragColor = currentTexelColor;
          return;
      }
  }

  gl_FragColor = vec4( gray, gray, gray, currentTexelColor.a );

}