#include "common.h"

uniform float4x4 m_script_params; 
uniform float4 m_hud_params;	// zoom_rotate_factor, secondVP_zoom_factor, NULL, NULL
uniform float4 m_blender_mode;	
Texture2D s_vp2;

struct 	v2p
{
 	float2 	tc0: 		TEXCOORD0;	// base
 	float3 	tc1: 		TEXCOORD1;	// environment
  	float4	c0:			COLOR0;		// sun.(fog*fog)
};


// Активен-ли двойной рендер --#SM+#--
inline bool isSecondVPActive()
{
	return (m_blender_mode.z == 1.0);
}

float resize(float input, float factor, float offset)
{
	return (input - 0.5f + offset) / factor + 0.5f - offset;
}

//////////////////////////////////////////////////////////////////////////////////////////
float4 main( v2p I ) : SV_Target
{
	//Constants
	float BAS_NV_BRIGHTNESS = 11.5;
	float3 BAS_NV_COLOR = (0.1, 1.0, 0.1);
	float BAS_NV_NOISE = 0.20;
	float BAS_NV_FLICK = 0.008;
	
	//Shading
	float4 t_base = s_base.Sample(smp_base, I.tc0);
	I.tc0.x = resize(I.tc0.x, screen_res.x / screen_res.y, 0);

	float4 t_vp2 = s_vp2.Sample(smp_base, I.tc0);

    float noise = frac(sin(dot(I.tc0, float2(12.0, 78.0) + timers.x)) * 43758.0); 
    float lum = dot(t_vp2.xyz, LUMINANCE_VECTOR * BAS_NV_BRIGHTNESS);

	if (!isSecondVPActive()) 
	{
		t_vp2.xyz /= 100;
	}	
	else
	{
	    t_vp2.xyz = BAS_NV_COLOR * lum; //BW + color
		t_vp2.xyz += noise * BAS_NV_NOISE; //Noise
		t_vp2.xyz += BAS_NV_FLICK * sin(timers.x * 73.0); //Flickering, fps hit
	}
	
	float3 final = lerp(t_vp2, t_base, t_base.a);
	return float4(final.r, final.g, final.b, m_hud_params.x);
}