/*
Overlay Bloom + Dots (Flashlight Edition) by KrossX
***************************************************

It applies a sort of common Photoshop effect of duplicating the background
layer, blurring it and setting it on top with the overlay blending mode.

The shader level controls the strength of the effect. And, there are some 
more options near the top of the fragment file.

Flashlight Edition 
		Added the black circle thingy texture as requested by lillium02.

v1.0 - Reworked the shader a bit, added some option macros, removed all the f's
	   and also added this description.	  
*/

uniform sampler2D OGL2TMU1;
uniform sampler2D OGL2Texture;
uniform vec4 OGL2Param;

varying vec2 offset[8];

// Controls the... spread of the blurryness.
#define OFFSET (0.5)

//Comment the line below to disable the dots
//#define DOTTY

#ifdef DOTTY
	//The higher, the stronger the dots and the overall darkness will be.
	#define DOTTY_MIX (0.2)
#endif

float overlay(float base, float blend)
{
	float result = 0.0;
	
	if( base < 0.5 ) 
		result = 2.0 * base * blend;
	else   
		result = 1.0 - (1.0 - 2.0*(base-0.5)) * (1.0-blend);
		
	return result;
}

#ifdef DOTTY
vec3 dotty(vec3 color)
{
	float rest = fract(gl_FragCoord.x*0.25);	
	
	if (rest < 0.25)
	{    		
		color.g = 0.0;
		color.b = 0.0;
	}
	else if (rest > 0.50 && rest < 0.75)
	{    
		color.r = 0.0;
		color.g = 0.0;	
	}
	else if (rest < 0.75)
	{    
		color.r = 0.0;		
		color.b = 0.0;
	}
	else	
		color *= 0.5;	

	rest = fract(gl_FragCoord.y*0.5);		
	if(rest > 0.5) color *= 0.5;

	return color;
}
#endif

void main (void)
{       		
	vec3 colorful = texture2D(OGL2Texture, gl_TexCoord[0].xy).rgb;			
	vec3 blurry = colorful;
	
	for(int i=0; i<8; i++)		
		blurry += 0.6 * texture2D(OGL2Texture, gl_TexCoord[0].xy + OFFSET * offset[i]).rgb;	
	for(int i=0; i<8; i++)		
		blurry += 0.3 * texture2D(OGL2Texture, gl_TexCoord[0].xy + OFFSET * 2 * offset[i]).rgb;		
				
	blurry /= 8.2;
	
	vec3 result = vec3(	overlay(colorful.r, blurry.r), 
						overlay(colorful.g, blurry.g), 
						overlay(colorful.b, blurry.b));
				
#ifdef DOTTY	
	colorful = mix(colorful, dotty(colorful), DOTTY_MIX);
	result = mix(result, dotty(result), DOTTY_MIX);
#endif

	vec3 blackthingy = texture2D(OGL2TMU1, gl_TexCoord[1].xy).rgb;
	
	float param = (OGL2Param.z + 1.0) * 0.20;			
	gl_FragColor.rgb = mix(colorful, result, param) * blackthingy;	
}