MegaMan9.fx

#include "ReShade.fxh"

uniform bool sharper <
    ui_tooltip = "Sharper";
> = 1;

sampler2D buffer
{
    Texture = ReShade::BackBufferTex;
    MinFilter = POINT;
    MagFilter = POINT;
    MipFilter = POINT;
    AddressU = Clamp;
    AddressV = Clamp;
};

float2 goodtobad (float2 pos)
{
    float2 badpos;
    badpos.x = (343.0 + pos.x * 1234) / 1920.0;
    badpos.y = pos.y;
    return badpos;
}

float4 PS_BilinearMM9(float4 pos : SV_Position, float2 uv : TEXCOORD0) : SV_Target
{
    //  Input:
    //   256x224 scaled into 343 -> 1234 -> 343 (8:7) in 1920x1080 buffer
    //  Output:
    //   240 -> 1440 -> 240 (4/3) in 1920x1080 buffer

    float2 fragment = float2(1920, 1080) * uv;

    // Our uv coords in the 256x224 buffer
    float2 samp;
    samp.x = (fragment.x - 240.0) / 1440.0;
    samp.y = fragment.y / 1080.0;

    float2 ploc;
    ploc = samp * float2(256, 224);
    float2 ppoffset = (ploc - 0.5) - (floor(ploc - 0.5));

    // Centers of 4 sampled pixels
    float2 ul = ploc - ppoffset;
    float2 ur = float2(ul.x + 1.0, ul.y);
    float2 ll = float2(ul.x, ul.y + 1.0);
    float2 lr = float2(ul.x + 1.0, ul.y + 1.0);

    if (sharper)
        ppoffset = ppoffset * ppoffset * ppoffset * ppoffset * (ppoffset * (ppoffset * (-20.0 * ppoffset + float2(70.0, 70.0)) - float2(84.0, 84.0)) + float2(35.0, 35.0));

    ul /= float2(256, 224);
    ur /= float2(256, 224);
    ll /= float2(256, 224);
    lr /= float2(256, 224);

    float4 cul = tex2D(buffer, goodtobad(ul));
    float4 cur = tex2D(buffer, goodtobad(ur));
    float4 cll = tex2D(buffer, goodtobad(ll));
    float4 clr = tex2D(buffer, goodtobad(lr));

    return lerp(lerp(cul, cur, ppoffset.x), lerp(cll, clr, ppoffset.x), ppoffset.y);
}

technique BilinearMM9
{
    pass BilinearMM9
    {
        VertexShader=PostProcessVS;
        PixelShader=PS_BilinearMM9;
    }
}