// LCD angle correction=ps_2_0
// Code from MPC

sampler s0 : register(s0);

// Fractions, either decimal or not, are allowed
// RedBrightness, GreenBrightness and BlueBrightness, interval [-10, 10], default 0
#define RedBrightnessTop 0
#define GreenBrightnessTop 0
#define BlueBrightnessTop 0
#define RedBrightnessBottom 0
#define GreenBrightnessBottom 0
#define BlueBrightnessBottom 0

// RedContrast, GreenContrast and BlueContrast, interval [0, 10], default 1
#define RedContrastTop 1
#define GreenContrastTop 1
#define BlueContrastTop 1
#define RedContrastBottom 1
#define GreenContrastBottom 1
#define BlueContrastBottom 1

// RedGamma, GreenGamma and BlueGamma, interval (0, 10], default 1
#define RedGammaTop 0.8
#define GreenGammaTop 0.8
#define BlueGammaTop 0.8
#define RedGammaBottom 1
#define GreenGammaBottom 1
#define BlueGammaBottom 1

float4 main(float2 tex : TEXCOORD0) : COLOR
{
	float3 s1 = tex2D(s0, tex).rgb;
	// original pixel
	float texyi = 1.0 - tex.y;
	s1 = s1 * (texyi * float3(RedContrastTop, GreenContrastTop, BlueContrastTop) + tex.y * float3(RedContrastBottom, GreenContrastBottom, BlueContrastBottom)) + texyi * float3(RedBrightnessTop, GreenBrightnessTop, BlueBrightnessTop) + tex.y * float3(RedBrightnessBottom, GreenBrightnessBottom, BlueBrightnessBottom);
	// process contrast and brightness on the original pixel
	// preserve the sign bits of RGB values
	float3 sb = sign(s1);
	return (sb*pow(abs(s1), texyi * float3(RedGammaTop, GreenGammaTop, BlueGammaTop) + tex.y * float3(RedGammaBottom, GreenGammaBottom, BlueGammaBottom))).rgbb;
	// process gamma correction and output
}