Circular Tilt-Shift

#pragma once

#if !defined(__RESHADE__) || __RESHADE__ < 30000
    #error "ReShade 3.0+ is required to use this header file"
#endif

#ifndef RESHADE_DEPTH_INPUT_IS_UPSIDE_DOWN
    #define RESHADE_DEPTH_INPUT_IS_UPSIDE_DOWN 0
#endif
#ifndef RESHADE_DEPTH_INPUT_IS_REVERSED
    #define RESHADE_DEPTH_INPUT_IS_REVERSED 1
#endif
#ifndef RESHADE_DEPTH_INPUT_IS_LOGARITHMIC
    #define RESHADE_DEPTH_INPUT_IS_LOGARITHMIC 0
#endif
#ifndef RESHADE_DEPTH_LINEARIZATION_FAR_PLANE
    #define RESHADE_DEPTH_LINEARIZATION_FAR_PLANE 1000.0
#endif
#ifndef RESHADE_USE_FAKE_DEPTH
    #define RESHADE_USE_FAKE_DEPTH 0
#endif

namespace ReShade
{
    // Global variables
#if defined(__RESHADE_FXC__)
    float GetAspectRatio() { return BUFFER_WIDTH * BUFFER_RCP_HEIGHT; }
    float2 GetPixelSize() { return float2(BUFFER_RCP_WIDTH, BUFFER_RCP_HEIGHT); }
    float2 GetScreenSize() { return float2(BUFFER_WIDTH, BUFFER_HEIGHT); }
    #define AspectRatio GetAspectRatio()
    #define PixelSize GetPixelSize()
    #define ScreenSize GetScreenSize()
#else
    static const float AspectRatio = BUFFER_WIDTH * BUFFER_RCP_HEIGHT;
    static const float2 PixelSize = float2(BUFFER_RCP_WIDTH, BUFFER_RCP_HEIGHT);
    static const float2 ScreenSize = float2(BUFFER_WIDTH, BUFFER_HEIGHT);
#endif

    // Global textures and samplers
    texture BackBufferTex : COLOR;
    texture DepthBufferTex : DEPTH;

    sampler BackBuffer { Texture = BackBufferTex; };
    sampler DepthBuffer { Texture = DepthBufferTex; };

#if RESHADE_USE_FAKE_DEPTH
    texture FakeDofTex < source = "dofmask.png"; > {Width = 1024; Height = 1024; Format = R8; };
    sampler FakeDof { Texture = FakeDofTex; };
#endif

    // Helper functions
    float GetLinearizedDepth(float2 texcoord)
    {
#if RESHADE_USE_FAKE_DEPTH
    float depth = tex2Dlod(FakeDof, float4 (texcoord, 0, 0)).x;
#else
    #if RESHADE_DEPTH_INPUT_IS_UPSIDE_DOWN
        texcoord.y = 1.0 - texcoord.y;
    #endif
        float depth = tex2Dlod(DepthBuffer, float4(texcoord, 0, 0)).x;

    #if RESHADE_DEPTH_INPUT_IS_LOGARITHMIC
        const float C = 0.01;
        depth = (exp(depth * log(C + 1.0)) - 1.0) / C;
    #endif
    #if RESHADE_DEPTH_INPUT_IS_REVERSED
        depth = 1.0 - depth;
    #endif
        const float N = 1.0;
        depth /= RESHADE_DEPTH_LINEARIZATION_FAR_PLANE - depth * (RESHADE_DEPTH_LINEARIZATION_FAR_PLANE - N);
#endif
        return depth;
    }
}

// Vertex shader generating a triangle covering the entire screen
void PostProcessVS(in uint id : SV_VertexID, out float4 position : SV_Position, out float2 texcoord : TEXCOORD)
{
    texcoord.x = (id == 2) ? 2.0 : 0.0;
    texcoord.y = (id == 1) ? 2.0 : 0.0;
    position = float4(texcoord * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);
}

'FakeDofTex': local variables cannot be textures or samplers