Miscellany

uniform extern texture ScreenTexture;    
uniform extern texture AlphaTexture; 
uniform extern float minLight;
uniform extern float lightMinLight;
uniform extern bool isScanner;
uniform extern bool lightsOn;

sampler ScreenS = sampler_state
{
    Texture = <ScreenTexture>;    
};   

sampler AlphaSampler = sampler_state
{
    Texture = <AlphaTexture>;    
};



float4 PixelShader(float2 texCoord: TEXCOORD0) : COLOR
{
	float4 Color = tex2D(ScreenS, texCoord);
	if(lightsOn)
	{	
		if(isScanner)
		{
			
		}
		float myval = tex2D(AlphaSampler, texCoord).a;
		if(minLight<0.45f && myval <0.25f)
		{
			Color.r*=0.2f;
			Color.g*=0.5f;
			Color.b*=2.0f;
		}
		//if(Color.a < lightMinLight)
			//Color.a=lightMinLight;	
		Color.a = tex2D(AlphaSampler, texCoord).a;
	
	}
	else
	{
	
	//else
	//	Color.r*=tex2D(AlphaSampler, texCoord).a/2;
	}
	
	
	
	if(Color.a < minLight)
			Color.a=minLight;	
	
	
	return Color;
}



technique
{
    pass P0
    {
        PixelShader = compile ps_2_0 PixelShader();
    }
}




float4 RGB_to_HSV (float4 color)
{
	float r, g, b, delta;
	float colorMax, colorMin;
	float h=0, s=0, v=0;
	float4 hsv=0;
	r = color[0];
	g = color[1];
	b = color[2];
	colorMax = max (r,g);
	colorMax = max (colorMax,b);
	colorMin = min (r,g);
	colorMin = min (colorMin,b);
	v = colorMax; // this is value
	if (colorMax != 0)
	{
		s = (colorMax - colorMin) / colorMax;
	}
	if (s != 0) // if not achromatic
	{
		delta = colorMax - colorMin;
		if (r == colorMax)
		{
			h = (g-b)/delta;
		}
		else if (g == colorMax)
		{
			h = 2.0 + (b-r) / delta;
		}
		else // b is max
		{
			h = 4.0 + (r-g)/delta;
		}
		h *= 60;
		if( h < 0)
		{
			h +=360;
		}
		hsv[0] = h / 360.0; // moving h to be between 0 and 1.
		hsv[1] = s;
		hsv[2] = v;
	}
	return hsv;
}

float4 HSV_to_RGB (float4 hsv)
{
	float4 color=0;
	float f,p,q,t;
	float h,s,v;
	float r=0,g=0,b=0;
	float i;
	if (hsv[1] == 0)
	{
		if (hsv[2] != 0)
		{
		color = hsv[2];
		}
	}
	else
	{
		h = hsv.x * 360.0;
		s = hsv.y;
		v = hsv.z;
		if (h == 360.0)
		{
			h=0;
		}
		h /=60;
		i = floor (h);
		f = h-i;
		p = v * (1.0 - s);
		q = v * (1.0 - (s * f));
		t = v * (1.0 - (s * (1.0 -f)));
		if (i == 0)
		{
			r = v;
			g = t;
			b = p;
		}
		else if (i == 1)
		{
			r = q;
			g = v;
			b = p;
		}
		else if (i == 2)
		{
			r = p;
			g = v;
			b = t;
		}
		else if (i == 3)
		{
			r = p;
			g = q;
			b = v;
		}
		else if (i == 4)
		{
			r = t;
			g = p;
			b = v;
		}
		else if (i == 5)
		{
			r = v;
			g = p;
			b = q;
		}
	color.r = r;
	color.g = g;
	color.b = b;
	}
	return color;
}