//========== Copyright (c) Valve Corporation, All rights reserved. ==========//

#include "common_ps_fxc.h"


struct PS_INPUT
{
	float2 vPos				: VPOS;		// Normalized Screenpos, call ComputeScreenPos() to get useful 2D coordinates
};

sampler TexSampler			: register( s0 );

float3 Shape( float3 cColor )
{
	float flLum = saturate(dot( cColor.xyz, float3( 0.3f, 0.59f, 0.11f) ));
	cColor.xyz *= flLum * flLum * flLum * flLum; // TODO: parametrize this
	return cColor;
}

float4 main( PS_INPUT i )	: COLOR
{
	// NOTE: Shape simulates what downsample_nohdr does to the pixel color
	float4 result = tex2D( TexSampler, saturate( ComputeScreenPos( i.vPos ) ) );

	// Local contrast needs gamma luminance in alpha
	float3 vGamma = SrgbLinearToGamma( result.rgb );
	result.a = dot( vGamma, float3( 0.299, 0.587, 0.114 ) );

	result.rgb = Shape( result.rgb );

	return max( 0, result );
}