#version 120
//#extension GL_EXT_gpu_shader4 : disable


#include "/lib/settings.glsl"


// flat varying vec3 ambientUp;
// flat varying vec3 ambientLeft;
// flat varying vec3 ambientRight;
// flat varying vec3 ambientB;
// flat varying vec3 ambientF;
// flat varying vec3 ambientDown;

flat varying vec3 lightSourceColor;
flat varying vec3 sunColor;
flat varying vec3 sunColorCloud;
flat varying vec3 moonColor;
flat varying vec3 moonColorCloud;
flat varying vec3 zenithColor;
flat varying vec3 avgSky;
flat varying vec2 tempOffsets;
flat varying float exposure;
flat varying float rodExposure;
flat varying float avgBrightness;
flat varying float exposureF;
flat varying float fogAmount;
flat varying float VFAmount;

uniform sampler2D colortex4;
uniform sampler2D noisetex;

uniform int frameCounter;
uniform float rainStrength;
uniform float eyeAltitude;
uniform vec3 sunVec;
uniform vec2 texelSize;
uniform float frameTimeCounter;
uniform mat4 gbufferProjection;
uniform mat4 gbufferProjectionInverse;
uniform mat4 gbufferPreviousProjection;
uniform mat4 gbufferModelViewInverse;
uniform mat4 gbufferModelView;
uniform mat4 shadowModelView;
uniform mat4 shadowProjection;
uniform float sunElevation;
uniform vec3 cameraPosition;
uniform float far;
uniform ivec2 eyeBrightnessSmooth;


#include "/lib/util.glsl"
#include "/lib/ROBOBO_sky.glsl"


vec3 toShadowSpaceProjected(vec3 p3){
    p3 = mat3(gbufferModelViewInverse) * p3 + gbufferModelViewInverse[3].xyz;
    p3 = mat3(shadowModelView) * p3 + shadowModelView[3].xyz;
    p3 = diagonal3(shadowProjection) * p3 + shadowProjection[3].xyz;

    return p3;
}
float interleaved_gradientNoise(){
	vec2 coord = gl_FragCoord.xy;
	float noise = fract(52.9829189*fract(0.06711056*coord.x + 0.00583715*coord.y)+frameCounter/1.6180339887);
	return noise;
}
float blueNoise(){
  return fract(texelFetch2D(noisetex, ivec2(gl_FragCoord.xy)%512, 0).a + 1.0/1.6180339887 * frameCounter);
}
vec4 lightCol = vec4(lightSourceColor, float(sunElevation > 1e-5)*2-1.);
const float[17] Slightmap = float[17](14.0,17.,19.0,22.0,24.0,28.0,31.0,40.0,60.0,79.0,93.0,110.0,132.0,160.0,197.0,249.0,249.0);

#include "/lib/end_fog.glsl"

void main() {
/* DRAWBUFFERS:4 */

gl_FragData[0] = vec4(0.0);

//Fog for reflections
if (gl_FragCoord.x > 18.+257. && gl_FragCoord.y > 1. && gl_FragCoord.x < 18+257+257.){
	vec2 p = clamp(floor(gl_FragCoord.xy-vec2(18.+257,1.))/256.+tempOffsets/256.,0.0,1.0);
	vec3 viewVector = cartToSphere(p);

  mat2x3 vL = getVolumetricRays(fract(frameCounter/1.6180339887),mat3(gbufferModelView)*viewVector*1024.,fract(frameCounter/2.6180339887));
  float absorbance = dot(vL[1],vec3(0.22,0.71,0.07));


	gl_FragData[0] = vec4(vL[0].rgb * (1.0-absorbance),1.0);
}

//Temporally accumulate sky and light values
vec3 temp = texelFetch2D(colortex4,ivec2(gl_FragCoord.xy),0).rgb;
vec3 curr = gl_FragData[0].rgb*150.;
gl_FragData[0].rgb = clamp(mix(temp,curr,0.07),0.0,65000.);

//Exposure values
if (gl_FragCoord.x > 10. && gl_FragCoord.x < 11.  && gl_FragCoord.y > 19.+18. && gl_FragCoord.y < 19.+18.+1 )
gl_FragData[0] = vec4(exposure,avgBrightness,exposureF,1.0);
if (gl_FragCoord.x > 14. && gl_FragCoord.x < 15.  && gl_FragCoord.y > 19.+18. && gl_FragCoord.y < 19.+18.+1 )
gl_FragData[0] = vec4(rodExposure,0.0,0.0,1.0);

}