Bilinear Interpolation for reshade

Hi everyone，I found Bilinear Interpolation shader code，but I can't make this working for reshade，anyone can made this？？？？？
Code:
/*
Copyright (c) 2013 James Slepicka

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*/

Texture2D tex;

SamplerState sam_linear
{
Filter = MIN_MAG_MIP_LINEAR;
AddressU = Clamp;
AddressV = Clamp;
};

matrix world;
matrix view;
matrix proj;

float2 tex_size;
float2 input_size;
float2 output_size;
float sharpness = 1.0;

struct VS_INPUT
{
float4 pos : POSITION;
float2 tex : TEXCOORD0;
};

struct PS_INPUT
{
float4 pos : SV_POSITION;
float2 tex : TEXCOORD0;
};

PS_INPUT VS (VS_INPUT input)
{
PS_INPUT output = (PS_INPUT)0;
output.pos = mul (input.pos, world);
output.pos = mul (output.pos, view);
output.pos = mul (output.pos, proj);
output.tex = input.tex;
return output;
}

float4 PS (PS_INPUT input) : SV_Target
{
float2 scale = output_size / input_size;
float2 interp = saturate((scale - lerp(scale, 1.0, sharpness))/(scale * 2.0));
float2 p = input.tex.xy * tex_size + .5;
float2 i = floor(p);
float2 f = p - i;
f = saturate((f - interp) / (1.0 - interp * 2.0));
p = ((i + f) - .5) / tex_size;
float4 r = tex.Sample(sam_linear, p);
r.a = 1.0;
return r;
}

technique10 render
{
pass P0
{
SetVertexShader(CompileShader(vs_4_0, VS()));
SetGeometryShader(NULL);
SetPixelShader(CompileShader(ps_4_0, PS()));
}
}

UP

Bilinear interpolation is hardware supported, no need for any custom shadercode. It's what ReShade does when sampling any texture, if specified in the sampler. There is no use of this code as is, it just modifies the default algorithm slightly. For any application where e.g. the quality of an upscaled image is important, one uses bicubic or other functions.

Uhh yes GPUs can do it.. But no, it's not "supported" in almost any game like reshade is.

In most older games, and plenty of modern ones, you get what the developer gives you.

Even if you delve deep into the nvidia inspector profiles, you get TONS of options to effect 3D games.. But zero to add bilinear filters to 2D games. It's just not something nvidia implemented as an option (and pretty sure amd/intel too).

And devs that use that absolute basic windows defaults, they get nearest neighbour scaling, not bilinear interpolation.

There is also a difference in how lower rez images are stretched, and how they are filtered. With stretch algorithms like nearest vs smoothsal x2, xBRZ, etc. And interpolation filters like bilinear or other similar techniques.

I know reshade isn't designed for resizing/stretching windows - But the equivalent effect can be faked with a shader.

So yea I'd love to see that one get translated to the latest reshade.. Or someone point out an equivalent.

I found plenty that remove bilinear filters that devs force on in many modern 2D games.. But i dunno which one is best for the reverse of that.

(and for my preference, depends highly on the game/artstyle which I prefer, so would be nice to have access to both)