#include "common.hlsli"
#include "pnv.hlsli"

uniform float4 m_hud_params;

struct v2p
{
    float2 tc0: TEXCOORD0;
    float3 tc1: TEXCOORD1;
    float4 c0: COLOR0;
};

float4 main(v2p I, float4 pos2d : SV_POSITION) : SV_Target
{
    if (m_hud_params.y * m_hud_params.a < 0.0001f) {
		return 0.0f;
	}
	
    float4 t_base = s_base.Sample(smp_base, I.tc0);
	t_base.xyz = detonemap(t_base.xyz);
	
    float4 t_vp2 = s_image[pos2d.xy];
	t_vp2.xyz = calc_night_vision_effect(I.tc0, t_vp2, float3(1.0, 2.0, 1.0));
	
	float alpha = m_hud_params.y * m_hud_params.a;
	t_vp2 *= saturate(alpha * 2.0f - 1.0f);

    float3 final = lerp(t_vp2.xyz, t_base.xyz, t_base.a);
    return float4(final.xyz, saturate(alpha * 2.0f));
}