slang-shaders/bezel/koko-aio/shaders-ng/includes/functions.include.slang

vec3 texture_BILINEAR(sampler2D t, vec2 uv, vec4 texSize, float k) {
       uv = uv -texSize.zw*0.5*k;
       vec2 texelSize = texSize.zw * k;
    vec2 f = fract( uv * texSize.xy );
    uv += ( .5 - f ) * texelSize;    // move uv to texel centre
    vec3 tl = texture(t, uv).rgb;
    vec3 tr = texture(t, uv + vec2(texelSize.x, 0.0)).rgb;
    vec3 bl = texture(t, uv + vec2(0.0, texelSize.y)).rgb;
    vec3 br = texture(t, uv + vec2(texelSize.x, texelSize.y)).rgb;
    vec3 tA = mix( tl, tr, f.x );
    vec3 tB = mix( bl, br, f.x );
    return mix( tA, tB, f.y );
}


vec3 texture_BILINEAR_X(sampler2D t, vec2 uv, vec4 texSize, float k) {
       uv = uv -texSize.zw*0.5*vec2(k,1.0);
       vec2 texelSize = texSize.zw * vec2(k, 1.0);
    vec2 f = fract( uv * texSize.xy );
    uv += ( .5 - f ) * texelSize;    // move uv to texel centre
    vec3 tl = texture(t, uv).rgb;
    vec3 tr = texture(t, uv + vec2(texelSize.x, 0.0)).rgb;
    return  mix( tl, tr, f.x );
}


float clamp_smooth(float x, float amin, float amax) {
	float sharp = 0.0;
    return mix(amin, amax, smoothstep(amin-sharp, amax+sharp, x));
}

vec3 clamp_smooth(vec3 x, vec3 amin, vec3 amax) {
	float sharp = 0.0;
    return mix(amin, amax, smoothstep(amin-sharp, amax+sharp, x));
}

vec2 clamp_smooth(vec2 x, vec2 a, vec2 b) {
	float sharp = 0.0;
    return mix(a, b, smoothstep(a-sharp, b+sharp, x));
}

vec2 coords_QULEZ_faster(vec2 co, vec4 texsize){
	//based on idea: https://iquilezles.org/articles/texture/
	co = co * texsize.xy + vec2(0.5);
	vec2 i = floor(co);
    vec2 f = sin((co - i - 0.5) * pi) * 0.5 + 0.5 ;
	co = i + f;
	co = (co - vec2(0.5) ) * texsize.zw;
	return co;
}

vec2 coords_QULEZ(vec2 co, vec4 texsize){
	//https://iquilezles.org/articles/texture/
	co = co * texsize.xy + vec2(0.5, 0.5);

	vec2 i = floor(co);
	vec2 f = co - i;
	f = (f * f) *
	    (f * (f * (f * 6.0 - vec2(15.0, 15.0)) + vec2(10.0, 10.0)));


	co = i + f;
	co = (co - vec2(0.5, 0.5)) * (texsize.zw);
	return co;
}

vec4 texture_QUILEZ(sampler2D tex, vec2 co, vec4 texsize) {
	co = coords_QULEZ(co, texsize);
	return texture(tex, co);
}


vec4 texture_NEAREST(sampler2D tex, vec2 co_linear, vec4 tex_size) {
   //return nearest sampling from a linear filtered texture
   vec2 integerCoords = floor(co_linear.xy * tex_size.xy);
   vec2 co_nearest = (integerCoords + 0.5) * tex_size.zw; // Aggiungi 0.5 per centrare il texel
   return texture(tex, co_nearest);
}

float DigitBin( const int x )
{
    return x==0?480599.0:x==1?139810.0:x==2?476951.0:x==3?476999.0:x==4?350020.0:x==5?464711.0:x==6?464727.0:x==7?476228.0:x==8?481111.0:x==9?481095.0:0.0;
}


float PrintValue( vec2 vStringCoords, float fValue, float fMaxDigits, float fDecimalPlaces )
{       
    if ((vStringCoords.y < 0.0) || (vStringCoords.y >= 1.0)) return 0.0;
    
    bool bNeg = ( fValue < 0.0 );
	fValue = abs(fValue);
    
	float fLog10Value = log2(abs(fValue)) / log2(10.0);
	float fBiggestIndex = max(floor(fLog10Value), 0.0);
	float fDigitIndex = fMaxDigits - floor(vStringCoords.x);
	float fCharBin = 0.0;
	if(fDigitIndex > (-fDecimalPlaces - 1.01)) {
		if(fDigitIndex > fBiggestIndex) {
			if((bNeg) && (fDigitIndex < (fBiggestIndex+1.5))) fCharBin = 1792.0;
		} else {		
			if(fDigitIndex == -1.0) {
				if(fDecimalPlaces > 0.0) fCharBin = 2.0;
			} else {
                float fReducedRangeValue = fValue;
                if(fDigitIndex < 0.0) { fReducedRangeValue = fract( fValue ); fDigitIndex += 1.0; }
				float fDigitValue = (abs(fReducedRangeValue / (pow(10.0, fDigitIndex))));
                fCharBin = DigitBin(int(floor(mod(fDigitValue, 10.0))));
			}
        }
	}
    return floor(mod((fCharBin / pow(2.0, floor(fract(vStringCoords.x) * 4.0) + (floor(vStringCoords.y * 5.0) * 4.0))), 2.0));
}

vec3 PrintValueVec3( vec2 vStringCoords, vec2 FragCoord,  float fValue, float fMaxDigits, float fDecimalPlaces ) {
	vec3 vColour = vec3(0.0);

	// Multiples of 4x5 work best
	vec2 vFontSize = vec2(8.0, 15.0);


	// Print a custom value
	vec2 vPixelCoord1 = vec2(5.0, 5.0);

	FragCoord.y = (vFontSize.y*2.0) - FragCoord.y;
	//FragCoord.y = (vFontSize.y*2.0) - FragCoord.y;
	//FragCoord.x -= 100;
	
    float customDigit = PrintValue( (  FragCoord - vPixelCoord1    ) / vFontSize, fValue, fMaxDigits, fDecimalPlaces);
	vColour = mix( vColour, vec3(0.0, 1.0, 1.0), customDigit);

	return vColour;
}





// mix_step returns a or b, depending on the mix value.
// mix is supposed to have just 2 values, 1.0 or 0.0; //FIXME: mix argument could be vec.

		vec2 mix_step(vec2 a, vec2 b, float m){
			return mix(a,b,m);  //114
			//return ( b-a )* m + a; //113.5
			//if (m==0.0) return a ; return b; //113.5
			//return (a * (1 - m)) + (b * m) ; //112
		}
		vec3 mix_step(vec3 a, vec3 b, float m){
			return mix(a,b,m);
			//return ( b-a )* m + a;
			//if (m==0.0) return a ; return b;
			//return (a * (1 - m)) + (b * m) ;
		}
		vec3 mix_step3(vec3 a, vec3 b, float m){
			return mix(a,b,m);
			//return ( b-a )* m + a;
			//if (m==0.0) return a ; return b;
			//return (a * (1 - m)) + (b * m) ;
		}
		vec4 mix_step(vec4 a, vec4 b, float m){
			return mix(a,b,m);
			//return ( b-a )* m + a;
			//if (m==0.0) return a ; return b;
			//return (a * (1 - m)) + (b * m) ;
		}
		float mix_step(float a, float b, float m){
			return mix(a,b,m);
			//return ( b-a )* m + a;
			//if (m==0.0) return a ; return b;
			//return (a * (1 - m)) + (b * m) ;
		}


//REFLECTION RELATED START
	float circle_smooth(vec2 coords, vec2 middle, float f_radius, float FALLOFF) {
	//Draw a circle with smoothed borders:
	float fdistance=distance(middle, vec2(coords.x, coords.y));
	float circle = (1-smoothstep(f_radius-FALLOFF, f_radius+FALLOFF, fdistance));
	return circle;
	}

	float square_smooth(vec2 co, vec2 corner, float size, float smoothshade) {
	//Draws a square with smooth borders:
	vec4 rect = vec4(corner.x, corner.y, corner.x+size, corner.y+size);
	vec2 hv = smoothstep(rect.xy - smoothshade, rect.xy, co) * smoothstep(co - smoothshade, co, rect.zw);
	return  hv.x * hv.y;
	}

	float corners_shade(vec2 co, float size_multiplier){
	//Draws 4 smooth squares or circles in the corners.
	//They are intended to modulate the blur radius and the strength of the reflection.
	
	/*
	vec4 circles;
	float circle_radius = size; //0.13?
	float circle_falloff = smoothsize; //0.05?
	float circle_power =2.0;
	circles.x = circle_smooth(co, vec2(0.0,0.0), circle_radius, circle_falloff) * circle_power;
	circles.y = circle_smooth(co, vec2(0.0,1.0), circle_radius, circle_falloff) * circle_power;
	circles.z = circle_smooth(co, vec2(1.0,0.0), circle_radius, circle_falloff) * circle_power;
	circles.w = circle_smooth(co, vec2(1.0,1.0), circle_radius, circle_falloff) * circle_power;
		
	float circle = max(max(max(circles.x, circles.y), circles.z), circles.w);
	circle = min(circle, 1.0);
	circle = 1-circle;
	
	return circle;
	*/      
	vec4 squares;
	float squaresize = BEZEL_REFL_CORNER_BLANK_SIZE * size_multiplier;
	float squarefade = BEZEL_REFL_CORNER_BLANK_SHADE * size_multiplier;
	//(vec2 co, vec2 corner, float size, float smoothshade) {
	squares.x = square_smooth(co, vec2(0.0,0.0), squaresize, squarefade);
	squares.y = square_smooth(co, vec2(1.0 - squaresize, 0.0), squaresize, squarefade);
	squares.z = square_smooth(co, vec2(0.0, 1-squaresize), squaresize, squarefade);
	squares.w = square_smooth(co, vec2(1-squaresize, 1-squaresize), squaresize, squarefade);
	return max(max(max(squares.x, squares.y), squares.z), squares.w);
	}
//REFLECTION RELATED ENDS

	
vec3 pixel_push_luminance(vec3 c, float strength) {
	//if (strength == 0.0) return c; //lighter without the check.
	float whiteness = max(max(c.r, c.g), c.b);
	whiteness = clamp(whiteness, 0.0, 1.0);
	return c * (1+vec3((1-whiteness) * strength));
}

/*
 * Superseeded by stage1/stage2 
vec3 apply_fuzzy_main_pass(vec3 color_in) {
	vec3 color_out = color_in;

	if (DO_CCORRECTION == 1.0) {
		color_out = pow(color_out, vec3(IN_GLOW_GAMMA * GAMMA_OUT));
	}
	
	if (DO_IN_GLOW == 1.0)
		color_out = color_out*IN_GLOW_POWER;

	
	if (DO_PIXELGRID == 1.0) {
		float m1 = (PIXELGRID_MAX_W + PIXELGRID_MIN_W) * 0.5;
		m1 = mix(1.0, m1, DO_PIXELGRID_W);
		
		float m2 = (PIXELGRID_MAX_H + PIXELGRID_MIN_H) * 0.5;
		m2 = mix(1.0, m2, DO_PIXELGRID_H);
		
		float m3 = mix(1.0, 0.75, PIXELGRID_Y_MASK);
	
		color_out = (color_out * m1) * (m2 * m3);
	}

	if (DO_HALO == 1.0)
		color_out += pow(color_in,vec3(HALO_GAMMA))*HALO_POWER;

	
	if (DO_VIGNETTE == 1.0)
		color_out *= 0.8 * (V_POWER);
	return color_out;
}
*/

float get_halo_ungain_factor() {
	return mix(1.0, 
			   max(IN_GLOW_POWER, 1.0), 
			   DO_CCORRECTION
			   );
}

vec2 apply_fuzzy_main_pass_stage_1() {
	//This simulates the final pass pixel processing so that previous passes like 
	//reflections, full screen luminance zoom and ambient light 
	//can react accordingly without doing the same thing twice.
	//For speed reasons, this lives in vertex shader and will output
	//a vec2(mul factor, pow factor)
	//in fragment shader one will pow(pow factor)*multiply factor;
	
	float color_in = 1.0;
	float color_out = 1.0;
	float gamma_out = 1.0;
	
	float halo_power_adapted;
	halo_power_adapted = HALO_POWER;
	if (HALO_NO_PREGAIN == 1.0) {
		halo_power_adapted /= get_halo_ungain_factor();
	}
	if (HALO_POWER < 0.0) 
		halo_power_adapted = -halo_power_adapted/10.0;
	
	if (DO_CCORRECTION == 1.0) {
		color_out = pow(color_in, GAMMA_OUT); //<- nonsense
		gamma_out = gamma_out * GAMMA_OUT;
		gamma_out = gamma_out * IN_GLOW_GAMMA;
		color_out = pow(color_out,IN_GLOW_GAMMA)*IN_GLOW_POWER;
	}
	
	if (DO_PIXELGRID == 1.0) {
		color_out *= 1- DO_PIXELGRID_H * 0.5   ; //Half color if scanline.
		color_out *= 1- DO_PIXELGRID_W * 0.5   ; //Half color if Hmask.
		color_out *= 1- PIXELGRID_Y_MASK * 0.2 ; //Strip at most 20% if level 2 ymask.
	}


	if (DO_HALO == 1.0) {
		color_out += color_in*halo_power_adapted / HALO_GAMMA;
		gamma_out = gamma_out * mix(1.0, HALO_GAMMA_OUT, halo_power_adapted*0.25) ;
	}
	
	if (DO_VIGNETTE == 1.0)
		color_out *= 0.8 * (V_POWER);
	

	
	return vec2(color_out/color_in, gamma_out );
}

vec3 apply_fuzzy_main_pass_stage_2(vec3 pixel_in, vec2 stage1 ) {
	//This gets the output of stage_1 to apply its pow and mul.
	return pow(pixel_in, vec3(stage1.y)) * stage1.x;
}

vec2 offsets_from_float(float in_param, int range){
    return vec2(  
                  (int(in_param) % range) - range*0.5,
                  floor(in_param / range) - range*0.5 
	        );
}

/*vec2 circles(float param, float c_radius, float aspect, float directions) {
   //given a 1d input param return full circles increasing radius.
   param = param*(pi/directions);
   float m = (c_radius * floor(param/pi)) * 100;
   return vec2(m * sin(param) * aspect, m * cos(param)) * vec2(aspect,1.0);
}

vec2 spiral(float param,float spr_radius,vec2 spr_offset, vec2 spr_scale) {
   //given a 1d input param returns a spiral
   float m = spr_radius * param;
   return vec2(m * sin(param), m * cos(param)) * spr_scale + spr_offset;
}
*/
bool similar(float a, float b, float threshold) {
   return abs(a-b) < threshold;
}

bool vec2_similar(vec2 a, vec2 b, float threshold) {
   return abs(a.x-b.x) < threshold  && abs(a.y-b.y) < threshold;
}


vec2 zoom(vec2 in_coords, float zoom_factor) {
   float off = 1.0/(zoom_factor*2.0) - 0.5;
   return (in_coords/zoom_factor)-off;
}

float zoom1D(float in_coord, float zoom_factor) {
   float off = 1.0/(zoom_factor*2.0) - 0.5;
   return (in_coord/zoom_factor)-off;
}

vec2 zoomxy(vec2 in_coords, vec2 zoom_factor) {
   vec2 off = 1.0/(zoom_factor*2.0) - 0.5;
   return (in_coords/zoom_factor)-off;
}

vec2 zoomout_coords(vec2 in_coords, float zoom_out, float aspect) {
   // to convert to standard zoom:
   // zoomout_coords(x) = zoom( 1/(x+1) );

	
   vec2 zoom   = vec2( 1 + zoom_out, 
                       1 + (zoom_out * aspect) 
                     );
                     
   vec2 offset = vec2( (zoom.x-1.0) / 2.0,
                       (zoom.y-1.0) / 2.0 
                     );
   return (in_coords * zoom) - offset;
}

bool scanline_have_to_flicker(bool is_interlaced) {
	float scanline_flickering = DO_PIXELGRID * PIXELGRID_INTR_FLICK_MODE;	
    return ((scanline_flickering == 1.0) || ((scanline_flickering==2.0) && is_interlaced ));
}

bool is_interlaced() {
	return (params.OriginalSize.y > MIN_LINES_INTERLACED);
}

float scale_to_range(float x, float dmin, float dmax) {
    //Scales 0..1 range to a..b range
    return ( (dmax-dmin) * x ) + dmin;
}

vec3 scale_to_range_vec3(vec3 x, float dmin, float dmax) {
    //Scales 0..1 range to a..b range
    return ( (dmax-dmin) * x ) + dmin;
}

vec3 scale_to_range_vec3(vec3 x, vec3 dmin, vec3 dmax) {
    //Scales 0..1 range to a..b range
    return ( (dmax-dmin) * x ) + dmin;
}
vec2 scale_to_range_vec2(vec2 x, float dmin, float dmax) {
    //Scales 0..1 range to a..b range
    return ( (dmax-dmin) * x ) + dmin;
}

float map_range(float value, float min_in, float max_in, float min_out, float max_out) {
	//Scales value in [min_in - max_in] to [min_out - max_out]
	return min_out + (value - min_in) * (max_out - min_out) / (max_in - min_in);
}

vec3 map_range(vec3 value, float min_in, float max_in, float min_out, float max_out) {
	//Scales value in [min_in - max_in] to [min_out - max_out]
	return min_out + (value - min_in) * (max_out - min_out) / (max_in - min_in);
}

float normalize_range(float value, float min_in, float max_in) {
	//Scales value in [min_in - max_in] to 0..1
	return (value - min_in)  / (max_in - min_in);
}

vec3 apply_contrast_brightness(vec3 c, float contrast, float brightness) {
   return scale_to_range_vec3(c, -contrast, 1+contrast) + brightness;
}

float apply_contrast_brightness(float c, float contrast, float brightness) {
   return scale_to_range(c, -contrast, 1+contrast) + brightness;
}

float round_step(float f, float p) {
	return floor(f*p)/p;
}

#define VEC2_RND_A_B vec2(12.9898, 78.233)
#define RND_C 43758.5453

float random(float power, vec2 seed) {
    //From pal-singlepass.slang 
    //https://github.com/svofski/CRT
    //Copyright (c) 2016, Viacheslav Slavinsky
    //All rights reserved.
    float dt = dot(seed.xy, VEC2_RND_A_B);
    float sn = mod(dt,3.14);

    float noise_out = fract(sin(sn) * RND_C);

    noise_out = scale_to_range(noise_out, -power, power);
    return noise_out;
}

//The following produces weird results when with dynamic seed like framecount.
float random_fast(float power, vec2 seed) {
	float noise_out = fract(sin(dot(seed.xy, VEC2_RND_A_B)) * RND_C);
    noise_out = scale_to_range(noise_out, -power, power);
    return noise_out;
}



//CURVATURE
	#define corner_aspect vec2(1.0,  0.75)
	float fn_border(vec2 coord) {
		coord = (coord - vec2(0.5)) + vec2(0.5, 0.5);
		coord = min(coord, vec2(1.0) - coord) * corner_aspect;
		vec2 cdist = vec2(GEOM_CORNER_SIZE);
		coord = (cdist - min(coord, cdist));
		float dist = sqrt(dot(coord, coord));
		return clamp((cdist.x - dist)*GEOM_CORNER_SMOOTH, 0.0, 1.0);
	}
	
	float border(vec2 coord) {
		coord = (coord - vec2(0.5)) + vec2(0.5, 0.5);
		coord = min(coord, vec2(1.0) - coord) * corner_aspect;
		vec2 cdist = vec2(GEOM_CORNER_SIZE);
		coord = (cdist - min(coord, cdist));
		float dist = sqrt(dot(coord, coord));
		return clamp((cdist.x - dist)*GEOM_CORNER_SMOOTH, 0.0, 1.0);
	}
	
	vec2 Warp_06(vec2 uv) {
		//Pre-calc version for curvature = 0.6,0.6
		uv = uv * 2.0 - 1.0;
		float curvedCoordsDistance = length(uv);
		uv /= curvedCoordsDistance;
		uv *= 1.0-pow(vec2(1.0-(curvedCoordsDistance/1.4142)), vec2(0.8928) );
		uv /= 0.6659;
		uv = uv* 0.5 + 0.5;
		return uv;
	}
	
	
	//warp full new
	vec2 Warp(vec2 uv,float wx, float wy){
		// Transform coordinates to range [-1, 1]
		uv = uv * 2.0 - 1.0;
		vec2 pow_exp = 1.0/(1.0+vec2(wx, wy) * 0.2 ) ;
		//float curvedCoordsDistance = length(uv);
		float curvedCoordsDistance = sqrt(uv.x*uv.x+uv.y*uv.y);
		curvedCoordsDistance = clamp(curvedCoordsDistance, 0.0, 1.4142);
		vec2 pow_base = vec2(1.0-(curvedCoordsDistance/1.4142135623730950488016887242097));
		pow_base = abs(pow_base); // <-- this way intel and nvidia (probably amd) acts the same.
		uv /= curvedCoordsDistance;
		uv *= (1.0-pow(pow_base,  pow_exp ));
		uv /= (1.0-pow(vec2(0.29289321881345247559915563789515),  pow_exp ));
		// Transform coordinates back to [0, 1]
		return uv* 0.5 + 0.5;
	}


	vec2 Warp_noclamp(vec2 uv,float wx, float wy){
		// Transform coordinates to range [-1, 1]
		uv = uv * 2.0 - 1.0;
		vec2 pow_exp = 1.0/(1.0+vec2(wx, wy) * 0.2 ) ;
		//float curvedCoordsDistance = length(uv);
		float curvedCoordsDistance = sqrt(uv.x*uv.x+uv.y*uv.y);
		//curvedCoordsDistance = clamp(curvedCoordsDistance, 0.0, 1.4142);
		vec2 pow_base = vec2(1.0-(curvedCoordsDistance/1.4142135623730950488016887242097));
		pow_base = abs(pow_base); // <-- this way intel and nvidia (probably amd) acts the same.
		uv /= curvedCoordsDistance;
		uv *= (1.0-pow(pow_base,  pow_exp ));
		uv /= (1.0-pow(vec2(0.29289321881345247559915563789515),  pow_exp ));
		// Transform coordinates back to [0, 1]
		return uv* 0.5 + 0.5;
	}
	
	
	vec2 Warp_koko(vec2 co, vec2 w, float protrusion) {
		//Keep protrusion higher than ~0.5
		float czoom  = 1 - distance(co, vec2(0.5));
		czoom        = mix(czoom, czoom * protrusion, czoom);
		vec2 czoom2d = mix(vec2(1.0), vec2(czoom), w);
		vec2 coff    = mix( vec2(0.0), vec2(0.625), w);
		return zoomxy(co, coff + czoom2d );
	}

	
	vec2 Warp_fast(vec2 uv, vec2 v_exp, vec2 arg2, float cut_ears) {
		/*This version is exact and faster than the other implementation,
		 * Just because it needs precalculed arguments that can live in
		 * vertex shader
		 */
		// Transform coordinates to range [-1, 1]
		uv = uv * 2.0 - 1.0;
		//float curvedCoordsDistance = length(uv);
		
		float curvedCoordsDistance = sqrt(uv.x*uv.x+uv.y*uv.y);
		curvedCoordsDistance = min(curvedCoordsDistance, cut_ears);
		vec2 pow_base = vec2(1.0-(curvedCoordsDistance/1.4142));
		pow_base = abs(pow_base); // <-- this way intel and nvidia (probably amd) acts the same.
		uv /= curvedCoordsDistance;
		uv *= 1.0-pow(pow_base, v_exp );
		uv /= arg2;
		// Transform coordinates back to [0, 1]
		return uv * 0.5 + 0.5;
	}
	
	
//VIGNETTE - SPOT
/*	float gauss(float x, float x0, float sx, float size, float power){
		float arg = x-x0;
		arg = -(1/size)/2.*arg*arg/sx;
		float a = 1./(pow(2.*3.1415*sx, 0.5));
		return a*exp(arg) * power;
	}

	float gauss_xy(float pos_x, float pos_y, float size, float power, float gmin, float gmax) {
		vec2 uv = vTexCoord.xy + vec2(pos_x,pos_y);
		float scale_uv = params.SourceSize.x / params.SourceSize.y;
		float gx = gauss(uv.x* scale_uv,  0.5*scale_uv,  0.1,    size, power);
		float gy = gauss(uv.y,            0.5,           0.1,    size, power);
		float light = gx*gy;
		return clamp(light,gmin,gmax);
	}
*/

//AMBILIGHT RELATED
	bool border_needed() {
		//returns if we need to draw on the border
		#ifdef STATIC_SUPPORT_BACKDROP
		return true;
		#else
		return (DO_AMBILIGHT + DO_BG_IMAGE + DO_BACKDROP > 0.0);
		#endif
	}

	
	#define mark_useless(x) mark_outer_frame(x)	
	vec4 mark_outer_frame(vec3 pixel) {
		return vec4(pixel.rgb,0.0) ;
		//For my mental sanity, I use a specific alpha channel value to mark a frame as a border
		return vec4(pixel.r,pixel.g,pixel.b,alpha_mark) ;
	}
	#define is_useless(x) is_outer_frame(x)
	bool is_outer_frame(vec4 pixel) {
		return pixel.a <= 0.004; // about 1/256
		/*Check if a pixel is marked as border by comparing the value of its alpha channel
		Tolerance is needed, because precision can be as low as 1/256; since I don't need
		alpha channel, use an even large tolerance.
		*/
		return  abs(pixel.a - alpha_mark) < 0.05; //<-- 0.05 allow about 20 alpha levels (1*0.05)
	}

	#define ar_tolerance 0.1 //To compensate when comparing different A/R 
	bool is_rotated() {
		/*
			For some reason, probably retroarch rotates the view only on final viewport stage, transparent to the shader passes,
			The OutputSize of a pass that scales to viewport will have different aspect from the real final viewport.
			We exploit this to understand when a game is rotated.
			-->> This function only works if the calling pass scales to viewport.
			This will fail for very particular cases, eg: when output window is extremely tall 
		*/
		return (abs((params.OutputSize.x/params.OutputSize.y) - (global.FinalViewportSize.x/global.FinalViewportSize.y)) > ar_tolerance);
	}

	float get_in_aspect() {
		if (ASPECT_X ==  0) return 1.3333333333333; //all mame games, not rotated
		if (ASPECT_X == -1) return 1.5;   // ntsc
		if (ASPECT_X == -2) return 1.25;  // pal
		if (ASPECT_X == -3) return 1.143; // 8/7 snes
		if (ASPECT_X == -4) return 1.428; // 10/7 megadrive
		if (ASPECT_X == -5) return params.OriginalSize.x/params.OriginalSize.y; //uncorrected
		if (ASPECT_X == -6) return 0.75;  // 3/4, pre-rotated (TATE) 1.33 games.
		return ASPECT_X / ASPECT_Y ;
	}

	vec2 get_scaled_coords_aspect(vec2 pTexCoord, vec4 destsize, float in_aspect , bool is_rotated){
		if (!border_needed()) return pTexCoord;
			//else
		float scale_x = 1.0;
		float scale_y = 1.0;
		float offset_x = 0.0 ;
		float offset_y = 0.0 ;
		if (is_rotated) {
			scale_y = destsize.x/(destsize.y / in_aspect );
			offset_y = (0.5 * scale_y ) - 0.5 ;
		} else {
			//to fit width, use this:
				scale_x = destsize.x/(destsize.y * in_aspect);
				offset_x = (0.5 * scale_x ) - 0.5 ;
				
			//to fit height, use this:
				//scale_y = destsize.y/(destsize.x / in_aspect);
				//offset_y = (0.5 * scale_y ) - 0.5 ;
		}

		vec2 scale_coord=vec2(pTexCoord.x*scale_x - offset_x , pTexCoord.y*scale_y - offset_y);
		return scale_coord;
	}
	
	vec2 get_scaled_coords(vec2 pTexCoord, vec4 destsize, bool is_rotated){
		if (!border_needed()) return pTexCoord;
			//else
		float scale_x = 1.0;
		float scale_y = 1.0;
		float offset_x = 0.0 ;
		float offset_y = 0.0 ;
		float in_aspect = get_in_aspect();
		if (is_rotated) {
			scale_y = destsize.x/(destsize.y / in_aspect );			
			offset_y = (0.5 * scale_y ) - 0.5 ;
		} else {
			scale_x = destsize.x/(destsize.y * in_aspect);
			offset_x = (0.5 * scale_x ) - 0.5 ;
		}

		vec2 scale_coord=vec2(pTexCoord.x*scale_x - offset_x , pTexCoord.y*scale_y - offset_y);
		return scale_coord;
	}
	
	vec2 integer_scale(vec2 in_coords, float target_aspect, bool is_rotated, float uncorrected_aspect) {
		
		float raw_in_aspect = params.OriginalSize.x/params.OriginalSize.y;
		float adapted_aspect = target_aspect / raw_in_aspect;
		
		//Keep aspect?
			adapted_aspect = mix_step(adapted_aspect, 1.0, uncorrected_aspect);
			in_coords.x = zoom1D(in_coords.x, adapted_aspect);

		vec2 izoom;
		if (!is_rotated) {
			//This is 1X integer zoom:
			izoom = params.OriginalSize.xy / global.FinalViewportSize.xy;
			//Find the maximum zoom allowed
			float int_zoom = floor(global.FinalViewportSize.y / params.OriginalSize.y );
			int_zoom = clamp(int_zoom, 1.0, GAME_GEOM_INT_SCALE_MAX);
			izoom *= int_zoom;
		} else {
			izoom = params.OriginalSize.xy / global.FinalViewportSize.yx;
			float int_zoom = floor(global.FinalViewportSize.y / (params.OriginalSize.x * adapted_aspect) );
			int_zoom = clamp(int_zoom, 1.0, GAME_GEOM_INT_SCALE_MAX);
			izoom *= int_zoom;
		}
		return zoomxy(in_coords, izoom);
	}

	bool need_NO_integer_scale() {
		//returns if no integer scaling is requested.
		return DO_GAME_GEOM_OVERRIDE * GAME_GEOM_INT_SCALE == 0.0;
	}

	bool need_integer_scale() {
		//return if integer scaling is requested.
		//return DO_GAME_GEOM_OVERRIDE == 1.0 && GAME_GEOM_INT_SCALE > 0.01;
		return DO_GAME_GEOM_OVERRIDE * GAME_GEOM_INT_SCALE != 0.0;
	}


	float get_BEZEL_INNER_ZOOM() {
		//Disables bezel inner zoom when using integer scaling
		return BEZEL_INNER_ZOOM * float( !need_integer_scale() );
	}

	vec2 content_geom_override(vec2 co, float aspect, float in_aspect, float vshift, float hshift, float out_zoom){
		//Aspect
		//float bUse_original_aspect = float(aspect < 0.01);
		float bUse_custom_aspect = step(0.01, aspect);

		float scale_y;
		/*if (aspect > 0.01) 
			scale_y = aspect/in_aspect;
				else
			scale_y = 1.0;
		*/
		//Unbranched previous:
		scale_y = mix_step(1.0, aspect/in_aspect, bUse_custom_aspect );
		
		float offset_y = (0.5 * scale_y ) - 0.5 ;
		co.y = co.y*scale_y - offset_y;
		//shift
		co.y -= vshift/10.0;
		co.x -= hshift/10.0;
		//zoom
		return zoom(co, out_zoom);
	}
	
//Blur/Glow
#define PI 3.14159265359
float sinc_lanczos(float x) {
    if (abs(x) < 0.001)
        return 1.0;

    x *= pi;
    return sin(x) / x;
}

//Lanczos kinda broken, problematic.
vec3 lanczos(sampler2D sampler_in, vec2 co, vec4 texsize, float sharpness ) {
   
   float data_pix_no = co.x * texsize.x;
   float data_one    = texsize.z;
   
   float texel      = floor(data_pix_no);
   float phase      = data_pix_no - texel;
   float base_phase = phase - 0.5;
   vec2 tex         = vec2((texel + 0.5) * texsize.z, co.y);

   vec3 col = vec3(0.0);
   for (int i = -2; i <= 2; i++) {
      float phase = base_phase - float(i);
      phase*= sharpness;
      if (abs(phase) < 2.0) { //FIXME check needed?
         float g = sinc_lanczos(phase);
         col += texture(sampler_in, tex + vec2(float(i) * data_one, 0.0)).rgb * g;
      }
   }

   return col * sharpness;
} 


	vec3 blur9_x_box(sampler2D image, vec2 uv, vec2 sourcesize, float sharpness_x, float sharp_sub) {
		sharp_sub = -2*sharp_sub+1;
		float resolution = sourcesize.x * sharpness_x;
		vec3 color = vec3(0.0);
		
		vec2 off1 = vec2(1.0 / resolution, 0.0)  ;
		vec2 off2 = vec2(2.0 / resolution, 0.0)  ;
			
		color += texture(image, uv).rgb        ;
		color += texture(image, uv + off1).rgb ;
		color += texture(image, uv - off1).rgb ;
		color += texture(image, uv + off2).rgb * sharp_sub;
		color += texture(image, uv - off2).rgb * sharp_sub;
		color = color/(3.0 + sharp_sub*2);
		return max(vec3(0.0), color);
	}

	vec3 blur9_y_box(sampler2D image, vec2 uv, vec2 sourcesize, float sharpness_y, float sharp_sub) {
		sharp_sub = -2*sharp_sub+1;
		float resolution = sourcesize.y * sharpness_y;
		vec3 color = vec3(0.0);
		vec2 off1 = vec2(0.0, 1.0 / resolution) ;
		vec2 off2 = vec2(0.0, 2.0 / resolution) ;
		color += texture(image, uv).rgb                       ;
		color += texture(image, uv + off1).rgb ;
		color += texture(image, uv - off1).rgb ;
		color += texture(image, uv + off2).rgb * sharp_sub;
		color += texture(image, uv - off2).rgb * sharp_sub;
		color = color/(3.0 + sharp_sub*2);
		return max(vec3(0.0), color);
	}
	
	vec3 glow_dumb(sampler2D in_texture, float glow_power, float gamma, vec2 coords) {
		return pow( texture(in_texture, coords).rgb, vec3(gamma) ) * glow_power;
	}

	vec3 blur9_x(sampler2D image, vec2 uv, vec2 sourcesize, float sharpness_x) {
		float resolution = sourcesize.x * sharpness_x;
		vec3 color = vec3(0.0);
		vec2 off1 = vec2(1.3846153846 / resolution, 0.0);
		vec2 off2 = vec2(3.2307692308 / resolution, 0.0);
		color += texture(image, uv).rgb                       * 0.2270270270;
		color += texture(image, uv + off1).rgb * 0.3162162162;
		color += texture(image, uv - off1).rgb * 0.3162162162;
		color += texture(image, uv + off2).rgb * 0.0702702703;
		color += texture(image, uv - off2).rgb * 0.0702702703;
		return color;
	}

	
	
	vec3 blur9_x_gamma(sampler2D image, vec2 uv, vec2 sourcesize, float sharpness_x, vec3 gamma) {
		float resolution = sourcesize.x * sharpness_x;
		vec3 color = vec3(0.0);
		vec2 off1 = vec2(1.3846153846 / resolution, 0.0);
		vec2 off2 = vec2(3.2307692308 / resolution, 0.0);
		vec3 lookup = texture(image, uv).rgb;
		color += pow(lookup, gamma) * 0.2270270270;
		lookup = texture(image, uv + off1).rgb;
		color += pow(lookup, gamma) * 0.3162162162;
		lookup = texture(image, uv - off1).rgb;
		color += pow(lookup, gamma) * 0.3162162162;
		lookup = texture(image, uv + off2).rgb;
		color += pow(lookup, gamma) *  0.0702702703;
		lookup = texture(image, uv - off2).rgb;
		color += pow(lookup, gamma) *  0.0702702703;
		return color;
	}

	vec3 blur9_y_gamma(sampler2D image, vec2 uv, vec2 sourcesize, float sharpness_x, vec3 gamma) {
		float resolution = sourcesize.x * sharpness_x;
		vec3 color = vec3(0.0);
		vec2 off1 = vec2(0.0, 1.3846153846 / resolution) ;
		vec2 off2 = vec2(0.0, 3.2307692308 / resolution) ;
		vec3 lookup = texture(image, uv).rgb;
		color += pow(lookup, gamma) * 0.2270270270;
		lookup = texture(image, uv + off1).rgb;
		color += pow(lookup, gamma) * 0.3162162162;
		lookup = texture(image, uv - off1).rgb;
		color += pow(lookup, gamma) * 0.3162162162;
		lookup = texture(image, uv + off2).rgb;
		color += pow(lookup, gamma) *  0.0702702703;
		lookup = texture(image, uv - off2).rgb;
		color += pow(lookup, gamma) *  0.0702702703;
		return color;
	}
	
	vec3 blur9_y(sampler2D image, vec2 uv, vec2 sourcesize, float sharpness_y) {
		float resolution = sourcesize.y * sharpness_y;
		vec3 color = vec3(0.0);
		vec2 off1 = vec2(0.0, 1.3846153846 / resolution) ;
		vec2 off2 = vec2(0.0, 3.2307692308 / resolution) ;
		color += texture(image, uv).rgb       * 0.2270270270;
		color += texture(image, uv + off1).rgb * 0.3162162162;
		color += texture(image, uv - off1).rgb * 0.3162162162;
		color += texture(image, uv + off2).rgb * 0.0702702703;
		color += texture(image, uv - off2).rgb * 0.0702702703;
		return color;
	}

	/*float is_scanline(vec2 uv){
		return float(int(mod(uv.y * params.OutputSize.y , 2.0 )) !=0.0) ;
	}

	vec3 blur9_y_e_scanline(sampler2D image, vec2 uv, vec2 sourcesize, float sharpness_y) {

		float mymod = int(mod(uv.y * params.OutputSize.y , 2.0 )) ;
		float scanline = float(   (mymod != 0.0)   ) ;

		vec2 resolution = sourcesize * sharpness_y;
		vec3 color = vec3(0.0);
		vec2 off1 = vec2(0.0, 1.3846153846) ;
		vec2 off2 = vec2(0.0, 3.2307692308) ;
		scanline = is_scanline(uv);
		color += texture(image, uv).rgb   * scanline         * 0.2270270270;
		scanline = is_scanline(uv + (off1 / resolution));
		color += texture(image, uv + (off1 / resolution)).rgb * scanline * 0.3162162162;
		scanline = is_scanline(uv - (off1 / resolution)  );
		color += texture(image, uv - (off1 / resolution)).rgb * scanline *  0.3162162162;
		scanline = is_scanline(uv + (off2 / resolution)  );
		color += texture(image, uv + (off2 / resolution)).rgb * scanline *  0.0702702703;
		scanline = is_scanline(uv - (off2 / resolution)  );
		color += texture(image, uv - (off2 / resolution)).rgb * scanline *  0.0702702703;
		return color;
	}


	vec3 blur9_y_alpha_aware(sampler2D image, vec2 uv, vec2 sourcesize, float sharpness_y) {
		vec2 resolution = sourcesize * sharpness_y;
		vec2 off1 = vec2(0.0, 1.3846153846) ;
		vec2 off2 = vec2(0.0, 3.2307692308) ;
		vec3 color = vec3(0.0);
		vec4 lookup = texture(image, uv);                   color += lookup.a * lookup.rgb * 0.2270270270;
		lookup = texture(image, uv  + (off1 / resolution)); color += lookup.a * lookup.rgb * 0.3162162162;
		lookup = texture(image, uv  - (off1 / resolution)); color += lookup.a * lookup.rgb * 0.3162162162;
		lookup = texture(image, uv  + (off2 / resolution)); color += lookup.a * lookup.rgb * 0.0702702703;
		lookup = texture(image, uv  - (off2 / resolution)); color += lookup.a * lookup.rgb * 0.0702702703;
		return color;
	}
	*/
	
	vec3 blur5_x(sampler2D image, vec2 uv, vec2 sourcesize, float sharpness_x, float lod) {
		float resolution = sourcesize.x * sharpness_x;
		vec3 color = vec3(0.0);
		vec2 off1 = vec2(1.333333333333 / resolution, 0.0);
		color += textureLod(image, uv, lod).rgb   * 0.29411764705882354;
		color += textureLod(image, uv + off1, lod).rgb   * 0.35294117647058826;
		color += textureLod(image, uv - off1, lod).rgb   * 0.35294117647058826;
		return color;
	}
	
	vec3 blur5_y(sampler2D image, vec2 uv, vec2 sourcesize, float sharpness_y, float lod) {
		float resolution = sourcesize.y * sharpness_y;
		vec3 color = vec3(0.0);
		vec2 off1 = vec2(0.0, 1.333333333333 / resolution) ;
		color += textureLod(image, uv, lod).rgb   * 0.29411764705882354;
		color += textureLod(image, uv + off1, lod).rgb   * 0.35294117647058826;
		color += textureLod(image, uv - off1, lod).rgb   * 0.35294117647058826;
		return color;
	}

#define RGB2GRAY_VEC3 vec3(0.299, 0.587, 0.114)
float rgb_to_gray(vec3 rgb) {
    return dot(rgb, RGB2GRAY_VEC3);
}
	
	//smoothly shade x and y < 0.0, currently unused	
	/*float blur_shade(vec2 co, float size) {
		
		float co_1D;	
		(co.x < 0.0 || co.x > 1.0) ? co_1D = co.x : co_1D = co.y ;

		float side_hi_switch = float(co_1D > 1.0);
		float side_lo_switch = float(co_1D < 0.0);
		
		float smooth_min = 1.0 * side_hi_switch;
		float smooth_max = smooth_min + ( 
						( size * side_hi_switch) + 
						(-size * side_lo_switch ) 
						);	
		
		return smoothstep(smooth_min, smooth_max, co_1D);
	}
	*/

	
vec3 hsv2rgb(vec3 c){
	vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
	vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
	return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}

#define eps10 1.0e-10
vec3 rgb2hsv(vec3 c){
	vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
	vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
	vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));

	float d = q.x - min(q.w, q.y);
	return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + eps10)), d / (q.x + eps10), q.x);
}
	
float get_dyn_zoom(sampler2D tex) {
	return 1.0 + (texture(tex, vec2(0.75,0.75)    ).a/ DYNZOOM_FACTOR) ;
}


vec2 tilt(vec2 co, float is_rotated, vec2 tilt) {

	vec2 r_tilt = vec2( mix_step(tilt.x, tilt.y, is_rotated),
	                    mix_step(tilt.y, -tilt.x, is_rotated)
);
	
	vec2 tilt_min = 1 - r_tilt;
	vec2 tilt_max = 1 + r_tilt;
	
	// X Tilt
		float tilt_x_range = scale_to_range(co.y, tilt_min.x, tilt_max.x);
		co = vec2( zoom1D(co.x, tilt_x_range),
		           zoom1D(co.y, tilt_x_range)
			);

	// Y Tilt
		float tilt_y_range = scale_to_range(co.x, tilt_min.y, tilt_max.y);
		co = vec2( zoom1D(co.x, tilt_y_range),
		           zoom1D(co.y, tilt_y_range)
			);
	
	// Aply FOV;
		vec2 fov = mix(vec2(1.0), vec2(TILT_FOV), abs( tilt.xy ));
		co = zoomxy(co, mix_step(fov.yx, fov.xy, is_rotated));

		co.xy += mix_step(tilt.yx, -tilt.xy, is_rotated) * 0.4;
		
	return co;

}
	
/*bool is_first_outside_rect(vec2 point, vec4 rect) {
	return (point.x < rect.x || point.x > rect.z ||
			point.y < rect.y || point.y > rect.w) ;
}

bool is_first_inside_rect(vec2 point, vec4 rect) {
	return (point.x >= rect.x && point.x < rect.z &&
			point.y >= rect.y && point.y < rect.w) ;
}
*/
bool is_first_inside_rect(vec2 point, vec4 rect) {
	vec2 bounded = clamp(point, rect.xy, rect.zw);
	return point == bounded;
}
bool is_first_outside_rect(vec2 point, vec4 rect) {
	vec2 bounded = clamp(point, rect.xy, rect.zw);
	return point != bounded;
}


// COLOR TOOLS
	vec3 kelvin2rgb(float k) {
	//Convert kelvin temperature to rgb factors
	k = clamp(k,1000,40000);
	k=k/100.0;
	float tmpCalc;
		vec3 pixel_out;
	if (k<=66) {
		pixel_out.r = 255;
		pixel_out.g = 99.47080258612 * log(k) - 161.11956816610;
	} else {
		pixel_out.r = 329.6987274461 * pow(k - 60 ,-0.13320475922);
		pixel_out.g = 288.12216952833 * pow(k-60, -0.07551484921);
	}

	if (k >= 66)
		pixel_out.b = 255;
	else if (k<=19)
		pixel_out.b = 0;
	else
		pixel_out.b = 138.51773122311 * log(k - 10) - 305.04479273072;

	return pixel_out/255.0;
	}

	#define W vec3(0.2125, 0.7154, 0.0721)
	vec3 color_tools(vec3 pixel_out, vec3 Temperature_rgb) {
	//Apply color corrections to input signal.

	//Push luminance without clipping
		pixel_out = pixel_push_luminance(pixel_out,LUMINANCE);

	//Modify contrast and brightness
		if (CONTRAST != 0.0 || BRIGHTNESS != 0.0)
			pixel_out.rgb = apply_contrast_brightness(pixel_out.rgb, CONTRAST, BRIGHTNESS);

	//Modify color temperature
		if (TEMPERATURE != 6500.0) pixel_out.rgb = pixel_out.rgb * Temperature_rgb;

		//Colorization for monochrome display on hsv colorspace.
		//Select different hues for dark and bright pixels and mix them depending on the brightness
		if (COLOR_MONO_COLORIZE > 0.01) {
			vec3 pixel_grayscale = vec3(dot(pixel_out.rgb, W));
			vec3 pixel_in_hsv = rgb2hsv(pixel_grayscale); //FIXME needed? yes, checked.
			float lum = pixel_in_hsv.z * pixel_in_hsv.z; //<-- looks way better!
			vec2 bias = mix_step( vec2(0.0, COLOR_MONO_HUE_BIAS), vec2(COLOR_MONO_HUE_BIAS, 0.0), float(COLOR_MONO_HUE_BIAS > 0.0));
			bias = abs(bias);

			lum=scale_to_range(lum, 0.0-bias.x, 1.0+bias.y);
			pixel_in_hsv.y=1.0; //sat

							//Mix hues in rgb colorspace:
								vec3 pixel_rgb_hue1 = hsv2rgb( vec3(COLOR_MONO_HUE1, 1.0, pixel_in_hsv.z ) );
								vec3 pixel_rgb_hue2 = hsv2rgb( vec3(COLOR_MONO_HUE2, 1.0, pixel_in_hsv.z ) );
								vec3 pixel_rgb_hue12 = mix(pixel_rgb_hue2, pixel_rgb_hue1, vec3(lum));
							//Mix original and colorized with a specified strength
								pixel_out = mix(pixel_out, pixel_rgb_hue12, COLOR_MONO_COLORIZE);


			//pixel_in_hsv.x = mix(COLOR_MONO_HUE2, COLOR_MONO_HUE1, lum); //hue
			//pixel_out = mix(pixel_out, hsv2rgb(pixel_in_hsv), COLOR_MONO_COLORIZE);pk
		}

	//Modify saturation
		if (!(SATURATION == 1.0)) {
			vec3 intensity = vec3(dot(pixel_out.rgb, W));
			pixel_out.rgb = mix(intensity, pixel_out.rgb, SATURATION);
		}

	return pixel_out;
	}

vec4 PG_get_hmask_preset() {
    /* Common masks:
    * 1 gm   : mask size = 2 | offsets=1,0,1  | width=0.3
    * 2 gmx  : mask size = 3 | offsets=1,0,1  | width=0.25
    * 3 rgb  : mask size = 3 | offsets=0,1,2  | width=0.25
    * 4 rgbx : mask size = 4 | offsets=0,1,2  | width=0.20
    * 3 rbg  : mask size = 3 | offsets=0,1,2  | width=0.25
    * 4 rbgx : mask size = 4 | offsets=0,1,2  | width=0.20
	* 5 wx   : mask size = 2 | offsets=0.3,0.3,0.3
    */
    if (PIXELGRID_H_PRST == 0.0) // manual mask and size
        return vec4( PIXELGRID_R_SHIFT, PIXELGRID_G_SHIFT, PIXELGRID_B_SHIFT, PIXELGRID_H_COUNT);
    
    if (PIXELGRID_H_PRST == 1.0)
        return vec4( vec3(1,0,1), 2); // gm, mask size 2

    if (PIXELGRID_H_PRST == 2.0)
        return vec4( vec3(1,0,1), 3); //gmx, mask size 3

    if (PIXELGRID_H_PRST == 3.0)
        return vec4( vec3(0,1,2), 3); //rgb, mask size 3

    if (PIXELGRID_H_PRST == 4.0)
        return vec4( vec3(0,1,2), 4); //rgbx, mask size 4

    if (PIXELGRID_H_PRST == 5.0)
        return vec4( vec3(0,2,1), 3); //rbg, mask size 3

    if (PIXELGRID_H_PRST == 6.0)
        return vec4( vec3(0,2,1), 4); //rbgx, mask size 4
		
    if (PIXELGRID_H_PRST == 7.0)
        return vec4( vec3(0.3,0.3,0.3), 2); //WX, mask size 2
}