mpc_be_gap45_wh.hlsl

// $MinimumShaderProfile: ps_4_0
// MPC-BE / MPC Video Renderer DX11 shader.
// Assumes source contains two equal-height images stacked vertically.
// Uses the common Shaders11 constant layout:
// float px; float py; float2 wh;
// Inserts exactly 45 black pixel lines between the two halves.

Texture2D tex : register(t0);
SamplerState samp : register(s0);

cbuffer PS_CONSTANTS : register(b0)
{
    float px;
    float py;
    float2 wh;
};

float4 main(float4 pos : SV_POSITION, float2 coord : TEXCOORD) : SV_Target
{
    float outH = wh.y;
    float gapNorm = 45.0 / outH;
    float halfOutNorm = (1.0 - gapNorm) * 0.5;

    if (coord.y < halfOutNorm)
    {
        float srcY = (coord.y / halfOutNorm) * 0.5;
        return tex.Sample(samp, float2(coord.x, srcY));
    }
    else if (coord.y < halfOutNorm + gapNorm)
    {
        return float4(0.0, 0.0, 0.0, 1.0);
    }
    else
    {
        float srcY = 0.5 + ((coord.y - halfOutNorm - gapNorm) / halfOutNorm) * 0.5;
        return tex.Sample(samp, float2(coord.x, srcY));
    }
}