#ifdef GL_ES
precision mediump int;
precision highp float;
#endif

#define USE_OGRE_FROM_FUTURE
#include <OgreUnifiedShader.h>

SAMPLER2D(uDepthMap, 0);
SAMPLER2D(uCookieMap, 1);
SAMPLER2D(uNoiseMap, 2);

OGRE_UNIFORMS(
uniform vec4 uAttenuation;
uniform vec3 uLightPosition;
uniform float uLightFarClipDistance;
uniform vec4 uLightColor;
uniform float Time;
)

MAIN_PARAMETERS
IN(vec3 oPos, TEXCOORD0)
IN(vec4 oUv, TEXCOORD1)
IN(vec2 orUv, TEXCOORD2)
MAIN_DECLARATION
{
  vec2 dUV = oUv.xy / vec2_splat(mix(0.0, 1.0, oUv.w)) + vec2_splat(0.001);
  
  float depth = texture2D(uDepthMap, dUV).r;
  float dist = length(oPos - uLightPosition) / uLightFarClipDistance;
  float rdist = length(oPos - uLightPosition) / uAttenuation.x;
  if (depth < dist)
  {
    gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
  }
  else
  {
    vec4 cookie = texture2D(uCookieMap, orUv);
    vec2 noise = vec2(texture2D(uNoiseMap, orUv - vec2_splat(Time * 0.0225)).r, texture2D(uNoiseMap, orUv + vec2_splat(Time * 0.0225)).g);

    float noisef = noise.x * noise.y;
    float atten = 1.0 / (uAttenuation.y + uAttenuation.z * rdist + uAttenuation.w * rdist * rdist);
    
    gl_FragColor = uLightColor * vec4(cookie.xyz * vec3_splat(cookie.a * atten * noisef), 1.0);
  }
}