//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//ENBSeries: boris-vorontsov@yandex.ru, boris-vorontsov.narod.ru
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
/*
THIS IS HLSL (HIGH LEVEL SHADER LANGUAGE) FILE FOR EXECUTING ADDITIONAL
HARDWARE EFFECTS. MAKE THE COPY BEFORE CHANGING IT!
*/

//keyboard controled variables
float	tempF1;
float	tempF2;
float	tempF3;
float	tempF4;
float	tempF5;
float	tempF6;
float	tempF7;
float	tempF8;
float	tempF9;
float	tempF0;


//global variables, already set before executing this code
float	ScreenSize;	//width of the display resolution (1024 f.e.)
float	ScreenScaleY;	//screen proportions (1.333 for 1024/768)
float4	ScreenBrightness;//rgba(0..1) color of the screen with time dependent inertia
float	ScreenBrightnessAdaptation;//(-10..10) for bloom it controls how much to dark in the night or when scene is dark (user defined constant factor)
float	bloomPower;//(0..10) actually used for bloom, but may be useful here (user defined constant factor)
float	useBloom;//(0 or 1) if bloom enabled by user



//textures
texture2D texColor;

sampler2D SamplerColor = sampler_state
{
	Texture   = <texColor>;
	MinFilter = LINEAR;
	MagFilter = LINEAR;
	MipFilter = LINEAR;//NONE;
	AddressU  = Clamp;
	AddressV  = Clamp;
	SRGBTexture=FALSE;
};

struct VS_OUTPUT_POST {
	float4 vpos  : POSITION;
	float2 txcoord : TEXCOORD0;
};

struct VS_INPUT_POST {
	float3 pos  : POSITION;
	float2 txcoord : TEXCOORD0;
};




//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
VS_OUTPUT_POST VS_PostProcess(VS_INPUT_POST IN)
{
	VS_OUTPUT_POST OUT;

	float4 pos=float4(IN.pos.x,IN.pos.y,IN.pos.z,1.0);

	OUT.vpos=pos;
	OUT.txcoord.xy=IN.txcoord.xy;

	return OUT;
}

float4 normalPS_PostProcess(VS_OUTPUT_POST In) : COLOR
{
	float offset = 1 / ScreenSize;
	float power = 0.5 * tempF0;
	float4 colx = float4(0,0,0,0);
	float4 coly = colx;
	float alpha = colx.w;
	int margin = 5;
	float coeff = 2 * tempF9;
	
	for(int i = 1; i < margin; i++)
		coly -= tex2D(SamplerColor, In.txcoord + float2(0, -offset * i)) / pow(i, coeff);
	for(int i = 1; i < margin; i++)
		coly += tex2D(SamplerColor, In.txcoord + float2(0, offset * i)) / pow(i, coeff);
	for(int i = 1; i < margin; i++)
		colx -= tex2D(SamplerColor, In.txcoord + float2(-offset * i, 0)) / pow(i, coeff);
	for(int i = 1; i < margin; i++)
		colx += tex2D(SamplerColor, In.txcoord + float2(offset * i, 0)) / pow(i, coeff);
	float x = (colx.r+colx.g+colx.b) / 3;
	float y = (coly.r+coly.g+coly.b) / 3;
	float z = (x+y)/2;
	return tex2D(SamplerColor, In.txcoord)+power*float4(z,z,z, alpha);
}



//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
technique PostProcess
{
    pass P0
    {
	VertexShader = compile vs_2_0 VS_PostProcess();
	PixelShader  = compile ps_2_0 normalPS_PostProcess();

	ALPHATESTENABLE=FALSE;
	SEPARATEALPHABLENDENABLE=FALSE;
	AlphaBlendEnable=FALSE;
	FogEnable=FALSE;
	SRGBWRITEENABLE=FALSE;
	}
}