#version 450

#include "compiled.inc"
#include "std/tonemap.glsl"
#include "std/math.glsl"
#ifdef _CDOF
#include "std/dof.glsl"
#endif
#ifdef _CPostprocess
#include "std/colorgrading.glsl"
#endif

uniform sampler2D tex;
#ifdef _CDepth
uniform sampler2D gbufferD;
#endif

#ifdef _CLensTex
uniform sampler2D lensTexture;
#endif

#ifdef _CLUT
uniform sampler2D lutTexture;
#endif

#ifdef _AutoExposure
uniform sampler2D histogram;
#endif

#ifdef _CPostprocess
uniform vec3 globalWeight;
uniform vec3 globalTint;
uniform vec3 globalSaturation;
uniform vec3 globalContrast;
uniform vec3 globalGamma;
uniform vec3 globalGain;
uniform vec3 globalOffset;

uniform vec3 shadowSaturation;
uniform vec3 shadowContrast;
uniform vec3 shadowGamma;
uniform vec3 shadowGain;
uniform vec3 shadowOffset;

uniform vec3 midtoneSaturation;
uniform vec3 midtoneContrast;
uniform vec3 midtoneGamma;
uniform vec3 midtoneGain;
uniform vec3 midtoneOffset;

uniform vec3 highlightSaturation;
uniform vec3 highlightContrast;
uniform vec3 highlightGamma;
uniform vec3 highlightGain;
uniform vec3 highlightOffset;

uniform vec3 PPComp1;
uniform vec3 PPComp2;
uniform vec3 PPComp3;
uniform vec3 PPComp4;
uniform vec3 PPComp5;
uniform vec3 PPComp6;
uniform vec3 PPComp7;
uniform vec3 PPComp8;
#endif

// #ifdef _CPos
// uniform vec3 eye;
// uniform vec3 eyeLook;
// #endif

#ifdef _CGlare
uniform vec3 light;
uniform mat4 VP;
uniform vec3 eye;
uniform vec3 eyeLook;
uniform float aspectRatio;
#endif

#ifdef _CTexStep
uniform vec2 texStep;
#endif

#ifdef _CGrain
uniform float time;
#endif

#ifdef _DynRes
uniform float dynamicScale;
#endif

#ifdef _CCameraProj
uniform vec2 cameraProj;
#endif

in vec2 texCoord;
// #ifdef _CPos
	// in vec3 viewRay;
// #endif
out vec4 fragColor;

#ifdef _CFog
// const vec3 compoFogColor = vec3(0.5, 0.6, 0.7);
// const float compoFogAmountA = 1.0; // b = 0.01
// const float compoFogAmountB = 1.0; // c = 0.1
// vec3 applyFog(vec3 rgb, // original color of the pixel
		 // float distance, // camera to point distance
		 // vec3 rayOri, // camera position
		 // vec3 rayDir) { // camera to point vector
	// float fogAmount = compoFogAmountB * exp(-rayOri.y * compoFogAmountA) * (1.0 - exp(-distance * rayDir.y * compoFogAmountA)) / rayDir.y;
	// return mix(rgb, compoFogColor, fogAmount);
// }
vec3 applyFog(vec3 rgb, float distance) {
	// float fogAmount = 1.0 - exp(-distance * compoFogAmountA);
	float fogAmount = 1.0 - exp(-distance * (compoFogAmountA / 100));
	return mix(rgb, compoFogColor, fogAmount);
}
#endif

#ifdef _CPostprocess
float ComputeEV100(const float aperture2, const float shutterTime, const float ISO) {
    return log2(aperture2 / shutterTime * 100.0 / ISO);
}
float ConvertEV100ToExposure(float EV100) {
    return 1/0.8 * exp2(-EV100);
}
float ComputeEV(float avgLuminance) {
    const float sqAperture = PPComp1[0].x * PPComp1.x;
    const float shutterTime = 1.0 / PPComp1.y;
    const float ISO = PPComp1.z;
    const float EC = PPComp2.x;

    float EV100 = ComputeEV100(sqAperture, shutterTime, ISO);

    return ConvertEV100ToExposure(EV100 - EC) * PI;
}
#endif

vec4 LUTlookup(in vec4 textureColor, in sampler2D lookupTable) {

    //Clamp to prevent weird results
    textureColor = clamp(textureColor, 0.0, 1.0);

    mediump float blueColor = textureColor.b * 63.0;
    mediump vec2 quad1;

    quad1.y = floor(floor(blueColor) / 8.0);
    quad1.x = floor(blueColor) - (quad1.y * 8.0);

    mediump vec2 quad2;
    quad2.y = floor(ceil(blueColor) / 8.0);
    quad2.x = ceil(blueColor) - (quad2.y * 8.0);

    highp vec2 texelPosition1;
    texelPosition1.x = (quad1.x * 0.125) + 0.5/512.0 + ((0.125 - 1.0/512.0) * textureColor.r);
    texelPosition1.y = (quad1.y * 0.125) + 0.5/512.0 + ((0.125 - 1.0/512.0) * textureColor.g);

    highp vec2 texelPosition2;
    texelPosition2.x = (quad2.x * 0.125) + 0.5/512.0 + ((0.125 - 1.0/512.0) * textureColor.r);
    texelPosition2.y = (quad2.y * 0.125) + 0.5/512.0 + ((0.125 - 1.0/512.0) * textureColor.g);

    lowp vec4 newColor1 = textureLod(lookupTable, texelPosition1, 0.0);
    lowp vec4 newColor2 = textureLod(lookupTable, texelPosition2, 0.0);

    lowp vec4 colorGradedResult = mix(newColor1, newColor2, fract(blueColor));

    return colorGradedResult;

}

#ifdef _CVignette
float vignette() {
	return (1.0 - compoVignetteStrength) + compoVignetteStrength * pow(16.0 * texCoord.x * texCoord.y * (1.0 - texCoord.x) * (1.0 - texCoord.y), 0.2);
}
#endif

#ifdef _CGlare
// Based on lense flare implementation by musk
// https://www.shadertoy.com/view/4sX3Rs 
vec3 lensflare(vec2 uv, vec2 pos) {
	vec2 uvd = uv * (length(uv));
	float f2 = max(1.0/(1.0+32.0*pow(length(uvd+0.8*pos),2.0)),0.0)*0.25;
	float f22 = max(1.0/(1.0+32.0*pow(length(uvd+0.85*pos),2.0)),0.0)*0.23;
	float f23 = max(1.0/(1.0+32.0*pow(length(uvd+0.9*pos),2.0)),0.0)*0.21;
	
	vec2 uvx = mix(uv, uvd, -0.5);
	float f4 = max(0.01-pow(length(uvx+0.4*pos),2.4),0.0)*6.0;
	float f42 = max(0.01-pow(length(uvx+0.45*pos),2.4),0.0)*5.0;
	float f43 = max(0.01-pow(length(uvx+0.5*pos),2.4),0.0)*3.0;
	
	uvx = mix(uv, uvd, -0.4);
	float f5 = max(0.01-pow(length(uvx+0.2*pos),5.5),0.0)*2.0;
	float f52 = max(0.01-pow(length(uvx+0.4*pos),5.5),0.0)*2.0;
	float f53 = max(0.01-pow(length(uvx+0.6*pos),5.5),0.0)*2.0;
	
	uvx = mix(uv, uvd, -0.5);
	float f6 = max(0.01-pow(length(uvx-0.3*pos),1.6),0.0)*6.0;
	float f62 = max(0.01-pow(length(uvx-0.325*pos),1.6),0.0)*3.0;
	float f63 = max(0.01-pow(length(uvx-0.35*pos),1.6),0.0)*5.0;
	
	vec3 c = vec3(0.0);
	c.r += f2 + f4 + f5 + f6;
	c.g += f22 + f42 + f52 + f62;
	c.b += f23 + f43 + f53 + f63;
	return c;
}
#endif

void main() {
	vec2 texCo = texCoord;
#ifdef _DynRes
	texCo *= dynamicScale;
#endif

#ifdef _CFishEye
	#ifdef _CPostprocess
		const float fishEyeStrength = -(PPComp2.y);
	#else
		const float fishEyeStrength = -0.01;
	#endif
	const vec2 m = vec2(0.5, 0.5);
	vec2 d = texCo - m;
	float r = sqrt(dot(d, d));
	float power = (2.0 * PI / (2.0 * sqrt(dot(m, m)))) * fishEyeStrength;
	float bind;
	if (power > 0.0) { bind = sqrt(dot(m, m)); }
	else { bind = m.x; }
	if (power > 0.0) {
		texCo = m + normalize(d) * tan(r * power) * bind / tan(bind * power);
	}
	else {
		texCo = m + normalize(d) * atan(r * -power * 10.0) * bind / atan(-power * bind * 10.0);
	}
#endif

#ifdef _CDepth
	float depth = textureLod(gbufferD, texCo, 0.0).r * 2.0 - 1.0;
#endif

#ifdef _CFXAA
	const float FXAA_REDUCE_MIN = 1.0 / 128.0;
	const float FXAA_REDUCE_MUL = 1.0 / 8.0;
	const float FXAA_SPAN_MAX = 8.0;
	
	vec2 tcrgbNW = (texCo + vec2(-1.0, -1.0) * texStep);
	vec2 tcrgbNE = (texCo + vec2(1.0, -1.0) * texStep);
	vec2 tcrgbSW = (texCo + vec2(-1.0, 1.0) * texStep);
	vec2 tcrgbSE = (texCo + vec2(1.0, 1.0) * texStep);
	vec2 tcrgbM = vec2(texCo);
	
	vec3 rgbNW = textureLod(tex, tcrgbNW, 0.0).rgb;
	vec3 rgbNE = textureLod(tex, tcrgbNE, 0.0).rgb;
	vec3 rgbSW = textureLod(tex, tcrgbSW, 0.0).rgb;
	vec3 rgbSE = textureLod(tex, tcrgbSE, 0.0).rgb;
	vec3 rgbM  = textureLod(tex, tcrgbM, 0.0).rgb;
	vec3 luma = vec3(0.299, 0.587, 0.114);
	float lumaNW = dot(rgbNW, luma);
	float lumaNE = dot(rgbNE, luma);
	float lumaSW = dot(rgbSW, luma);
	float lumaSE = dot(rgbSE, luma);
	float lumaM  = dot(rgbM,  luma);
	float lumaMin = min(lumaM, min(min(lumaNW, lumaNE), min(lumaSW, lumaSE)));
	float lumaMax = max(lumaM, max(max(lumaNW, lumaNE), max(lumaSW, lumaSE)));
	
	vec2 dir;
	dir.x = -((lumaNW + lumaNE) - (lumaSW + lumaSE));
	dir.y =  ((lumaNW + lumaSW) - (lumaNE + lumaSE));
	
	float dirReduce = max((lumaNW + lumaNE + lumaSW + lumaSE) *
						  (0.25 * FXAA_REDUCE_MUL), FXAA_REDUCE_MIN);
	
	float rcpDirMin = 1.0 / (min(abs(dir.x), abs(dir.y)) + dirReduce);
	dir = min(vec2(FXAA_SPAN_MAX, FXAA_SPAN_MAX),
			  max(vec2(-FXAA_SPAN_MAX, -FXAA_SPAN_MAX),
			  dir * rcpDirMin)) * texStep;
			  
	vec3 rgbA = 0.5 * (
		textureLod(tex, texCo + dir * (1.0 / 3.0 - 0.5), 0.0).rgb +
		textureLod(tex, texCo + dir * (2.0 / 3.0 - 0.5), 0.0).rgb);
	vec3 rgbB = rgbA * 0.5 + 0.25 * (
		textureLod(tex, texCo + dir * -0.5, 0.0).rgb +
		textureLod(tex, texCo + dir * 0.5, 0.0).rgb);
	
	float lumaB = dot(rgbB, luma);
	if ((lumaB < lumaMin) || (lumaB > lumaMax)) fragColor = vec4(rgbA, 1.0);
	else fragColor = vec4(rgbB, 1.0);

#else
	
	#ifdef _CDOF
		#ifdef _CPostprocess

			bool compoAutoFocus = false;
			float compoDistance = PPComp3.x;
			float compoLength = PPComp3.y;
			float compoStop = PPComp3.z;

			if (PPComp2.z == 1){
				compoAutoFocus = true;
			} else {
				compoAutoFocus = false;
			}

			fragColor.rgb = dof(texCo, depth, tex, gbufferD, texStep, cameraProj, compoAutoFocus, compoDistance, compoLength, compoStop);
		#else
			fragColor.rgb = dof(texCo, depth, tex, gbufferD, texStep, cameraProj, true, compoDOFDistance, compoDOFLength, compoDOFFstop);
		#endif
	#else
	fragColor = textureLod(tex, texCo, 0.0);
	#endif

#endif
	
#ifdef _CSharpen
	vec3 col1 = textureLod(tex, texCo + vec2(-texStep.x, -texStep.y) * 1.5, 0.0).rgb;
	vec3 col2 = textureLod(tex, texCo + vec2(texStep.x, -texStep.y) * 1.5, 0.0).rgb;
	vec3 col3 = textureLod(tex, texCo + vec2(-texStep.x, texStep.y) * 1.5, 0.0).rgb;
	vec3 col4 = textureLod(tex, texCo + vec2(texStep.x, texStep.y) * 1.5, 0.0).rgb;
	vec3 colavg = (col1 + col2 + col3 + col4) * 0.25;
	fragColor.rgb += (fragColor.rgb - colavg) * compoSharpenStrength;
#endif

#ifdef _CFog
	// if (depth < 1.0) {
		// vec3 pos = getPos(depth, cameraProj);
		// float dist = distance(pos, eye);
		float dist = linearize(depth, cameraProj);
		// vec3 eyedir = eyeLook;// normalize(eye + pos);
		// fragColor.rgb = applyFog(fragColor.rgb, dist, eye, eyedir);
		fragColor.rgb = applyFog(fragColor.rgb, dist);
	// }
#endif

#ifdef _CGlare
	if (dot(light, eyeLook) > 0.0) { // Facing light
		vec4 lndc = VP * vec4(light, 1.0);
		lndc.xy /= lndc.w;
		vec2 lss = lndc.xy * 0.5 + 0.5;
		float lssdepth = linearize(textureLod(gbufferD, lss, 0.0).r * 2.0 - 1.0, cameraProj);
		float lightDistance = distance(eye, light);
		if (lightDistance <= lssdepth) {
			vec2 lensuv = texCo * 2.0 - 1.0;
			lensuv.x *= aspectRatio;
			vec3 lensflarecol = vec3(1.4, 1.2, 1.0) * lensflare(lensuv, lndc.xy);
			fragColor.rgb += lensflarecol;
		}
	}
#endif

#ifdef _CGrain
	// const float compoGrainStrength = 4.0;
	float x = (texCo.x + 4.0) * (texCo.y + 4.0) * (time * 10.0);
	#ifdef _CPostprocess
		fragColor.rgb += vec3(mod((mod(x, 13.0) + 1.0) * (mod(x, 123.0) + 1.0), 0.01) - 0.005) * PPComp4.y;
	#else
		fragColor.rgb += vec3(mod((mod(x, 13.0) + 1.0) * (mod(x, 123.0) + 1.0), 0.01) - 0.005) * compoGrainStrength;
	#endif
#endif
	
#ifdef _CGrainStatic
	float x = (texCo.x + 4.0) * (texCo.y + 4.0) * 10.0;
	fragColor.rgb += vec3(mod((mod(x, 13.0) + 1.0) * (mod(x, 123.0) + 1.0), 0.01) - 0.005) * 0.09;
#endif

#ifdef _CVignette
	fragColor.rgb *= vignette();
#endif

#ifdef _CExposure
	fragColor.rgb += fragColor.rgb * compoExposureStrength;
#endif

#ifdef _CPostprocess
	fragColor.rgb *= ComputeEV(0.0);
#endif

#ifdef _AutoExposure
	float expo = 2.0 - clamp(length(textureLod(histogram, vec2(0.5, 0.5), 0).rgb), 0.0, 1.0);
	fragColor.rgb *= pow(expo, autoExposureStrength * 2.0);
#endif

#ifdef _CPostprocess

	#ifdef _CToneCustom
		fragColor.rgb = clamp((fragColor.rgb * (PPComp4.z * fragColor.rgb + PPComp5.x)) / (fragColor.rgb * (PPComp5.y * fragColor.rgb + PPComp5.z) + PPComp6.x), 0.0, 1.0);
	#else
		if(PPComp4.x == 0){ //Filmic 1
			fragColor.rgb = tonemapFilmic(fragColor.rgb); // With gamma
		} else if (PPComp4.x == 1){ //Filmic 2
			fragColor.rgb = acesFilm(fragColor.rgb);
			fragColor.rgb = pow(fragColor.rgb, vec3(1.0 / 2.2));
		} else if (PPComp4.x == 2){ //Reinhard
			fragColor.rgb = tonemapReinhard(fragColor.rgb);
			fragColor.rgb = pow(fragColor.rgb, vec3(1.0 / 2.2));
		} else if (PPComp4.x == 3){ //Uncharted2
			fragColor.rgb = tonemapUncharted2(fragColor.rgb);
			fragColor.rgb = pow(fragColor.rgb, vec3(1.0 / 2.2)); // To gamma
			fragColor.rgb = clamp(fragColor.rgb, 0.0, 1.0);
		} else if (PPComp4.x == 4){ //None
			fragColor.rgb = pow(fragColor.rgb, vec3(1.0 / 2.2)); // To gamma
		} else if (PPComp4.x == 5){ //Non-Gamma / Linear
			fragColor.rgb = fragColor.rgb;
		} else if (PPComp4.x == 6){ //HDP
			vec3 x = fragColor.rgb - 0.004;
			//vec3 x = max(0, fragColor.rgb - 0.004);
			fragColor.rgb = (x*(6.2*x+.5))/(x*(6.2*x+1.7)+0.06);
		} else if (PPComp4.x == 7){ //Raw
			vec4 vh = vec4(fragColor.rgb, 1);
			vec4 va = (1.425 * vh) + 0.05;
			vec4 vf = ((vh * va + 0.004) / ((vh * (va + 0.55) + 0.0491))) - 0.0821;
			fragColor.rgb = vf.rgb / vf.www; 
		} else if (PPComp4.x == 8){ //False Colors for luminance control

			vec4 c = vec4(fragColor.r,fragColor.g,fragColor.b,0); //Linear without gamma

			vec3 luminanceVector = vec3(0.2125, 0.7154, 0.0721); //Relative Luminance Vector
			float luminance = dot(luminanceVector, c.xyz);

			vec3 maxLumColor = vec3(1,0,0); //High values (> 1.0)
			//float maxLum = 2.0; Needs to read the highest pixel, but I don't know how to yet
			//Probably easier with a histogram too, once it's it in place?

			vec3 midLumColor = vec3(0,1,0); //Mid values (< 1.0)
			float midLum = 1.0;

			vec3 minLumColor = vec3(0,0,1); //Low values (< 1.0)
			float minLum = 0.0;

			if(luminance < midLum){
				fragColor.rgb = mix(minLumColor, midLumColor, luminance);
			} else {
				fragColor.rgb = mix(midLumColor, maxLumColor, luminance);
			}
			
		} else {
			fragColor.rgb = vec3(0,1,0); //ERROR
		}
	#endif

#else
	#ifdef _CToneFilmic
		fragColor.rgb = tonemapFilmic(fragColor.rgb); // With gamma
	#endif
	#ifdef _CToneFilmic2
		fragColor.rgb = acesFilm(fragColor.rgb);
		fragColor.rgb = pow(fragColor.rgb, vec3(1.0 / 2.2));
	#endif
	#ifdef _CToneReinhard
		fragColor.rgb = tonemapReinhard(fragColor.rgb);
		fragColor.rgb = pow(fragColor.rgb, vec3(1.0 / 2.2));
	#endif
	#ifdef _CToneUncharted
		fragColor.rgb = tonemapUncharted2(fragColor.rgb);
		fragColor.rgb = pow(fragColor.rgb, vec3(1.0 / 2.2)); // To gamma
		fragColor.rgb = clamp(fragColor.rgb, 0.0, 2.2);
	#endif
	#ifdef _CToneNone
		fragColor.rgb = pow(fragColor.rgb, vec3(1.0 / 2.2)); // To gamma
	#endif
	#ifdef _CToneCustom
		fragColor.rgb = clamp((fragColor.rgb * (1 * fragColor.rgb + 1)) / (fragColor.rgb * (1 * fragColor.rgb + 1 ) + 1), 0.0, 1.0);
	#endif
#endif
	
#ifdef _CBW
	// fragColor.rgb = vec3(clamp(dot(fragColor.rgb, fragColor.rgb), 0.0, 1.0));
	fragColor.rgb = vec3((fragColor.r * 0.3 + fragColor.g * 0.59 + fragColor.b * 0.11) / 3.0) * 2.5;
#endif

// #ifdef _CContrast
	// -0.5 - 0.5
	// const float compoContrast = 0.2;
	// fragColor.rgb = ((fragColor.rgb - 0.5) * max(compoContrast + 1.0, 0.0)) + 0.5;
// #endif

// #ifdef _CBrighness
	// fragColor.rgb += compoBrightness;
// #endif

#ifdef _CPostprocess
	//Global Values

		float factor = 1;
		float colorTempK = globalWeight.x;
		vec3 ColorTempRGB = ColorTemperatureToRGB(colorTempK);

		float originalLuminance = Luminance(fragColor.rgb);
		vec3 blended = mix(fragColor.rgb, fragColor.rgb * ColorTempRGB, factor);
		vec3 resultHSL = RGBtoHSL(blended);
		vec3 luminancePreservedRGB = HSLtoRGB(vec3(resultHSL.x, resultHSL.y, originalLuminance));
		fragColor = vec4(mix(blended, luminancePreservedRGB, LUMINANCE_PRESERVATION), 1.0);

		mat3 CCSaturation = mat3 (													//Saturation
			globalSaturation.r * shadowSaturation.r, globalSaturation.g * shadowSaturation.g, globalSaturation.b * shadowSaturation.b,				//Shadows + Global
			globalSaturation.r * midtoneSaturation.r, globalSaturation.g * midtoneSaturation.g, globalSaturation.b * midtoneSaturation.b,				//Midtones + Global
			globalSaturation.r * highlightSaturation.r, globalSaturation.g * highlightSaturation.g, globalSaturation.b * highlightSaturation.b				//Highlights + Global
		);

		mat3 CCContrast = mat3 (
			globalContrast.r * shadowContrast.r, globalContrast.g * shadowContrast.g, globalContrast.b * shadowContrast.b,				//Shadows + Global
			globalContrast.r * midtoneContrast.r, globalContrast.g * midtoneContrast.g, globalContrast.b * midtoneContrast.b,				//Midtones + Global
			globalContrast.r * highlightContrast.r, globalContrast.g * highlightContrast.g, globalContrast.b * highlightContrast.b				//Highlights + Global
		);

		mat3 CCGamma = mat3 (
			globalGamma.r * shadowGamma.r, globalGamma.g * shadowGamma.g, globalGamma.b * shadowGamma.b,				//Shadows + Global
			globalGamma.r * midtoneGamma.r, globalGamma.g * midtoneGamma.g, globalGamma.b * midtoneGamma.b,				//Midtones + Global
			globalGamma.r * highlightGamma.r, globalGamma.g * highlightGamma.g, globalGamma.b * highlightGamma.b				//Highlights + Global
		);

		mat3 CCGain = mat3 (
			globalGain.r * shadowGain.r, globalGain.g * shadowGain.g, globalGain.b * shadowGain.b,				//Shadows + Global
			globalGain.r * midtoneGain.r, globalGain.g * midtoneGain.g, globalGain.b * midtoneGain.b,				//Midtones + Global
			globalGain.r * highlightGain.r, globalGain.g * highlightGain.g, globalGain.b * highlightGain.b			//Highlights + Global
		);

		mat3 CCOffset = mat3 (
			globalOffset.r * shadowOffset.r, globalOffset.g * shadowOffset.g, globalOffset.b * shadowOffset.b,				//Shadows + Global
			globalOffset.r * midtoneOffset.r, globalOffset.g * midtoneOffset.g, globalOffset.b * midtoneOffset.b,				//Midtones + Global
			globalOffset.r * highlightOffset.r, globalOffset.g * highlightOffset.g, globalOffset.b	* highlightOffset.b			//Highlights + Global
		);

		vec2 ToneWeights = vec2(globalWeight.y, globalWeight.z);

		fragColor.rgb = FinalizeColorCorrection(
			fragColor.rgb, 
			CCSaturation, 
			CCContrast, 
			CCGamma, 
			CCGain, 
			CCOffset,
			ToneWeights
		);

		//Tint
		fragColor.rgb *= vec3(globalTint.r,globalTint.g,globalTint.b);
#endif

#ifdef _CLensTex
	#ifdef _CLensTexMasking
		vec4 scratches = texture(lensTexture, texCo);
		vec3 scratchBlend = fragColor.rgb + scratches.rgb;

		#ifdef _CPostprocess
			float centerMaxClip = PPComp6.y;
			float centerMinClip = PPComp6.z;
			float luminanceMax = PPComp7.x;
			float luminanceMin = PPComp7.y;
			float brightnessExp = PPComp7.z;
		#else
			float centerMaxClip = compoCenterMaxClip;
			float centerMinClip = compoCenterMinClip;
			float luminanceMax = compoLuminanceMax;
			float luminanceMin = compoLuminanceMin;
			float brightnessExp = compoBrightnessExponent;
		#endif
		
		float center = smoothstep(centerMaxClip, centerMinClip, length(texCo - 0.5));
		float luminance = dot(fragColor.rgb, vec3(0.299, 0.587, 0.114));
		float brightnessMap = smoothstep(luminanceMax, luminanceMin, luminance * center);
		fragColor.rgb = clamp(mix(fragColor.rgb, scratchBlend, brightnessMap * brightnessExp), 0, 1);
	#else
		fragColor.rgb += textureLod(lensTexture, texCo, 0.0).rgb;
	#endif
#endif

#ifdef _CLetterbox
	// const float compoLetterboxSize = 0.1;
	fragColor.rgb *= 1.0 - step(0.5 - compoLetterboxSize, abs(0.5 - texCo.y));
#endif

//3D LUT Implementation from GPUGems 2 by Nvidia
//https://developer.nvidia.com/gpugems/GPUGems2/gpugems2_chapter24.html

#ifdef _CLUT
	fragColor = LUTlookup(fragColor, lutTexture);
#endif
}