duckstation/data/resources/shaders/reshade/Shaders/ReShade.fxh

119 lines
4.0 KiB
HLSL

/*
* SPDX-License-Identifier: CC0-1.0
*/
#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_MULTIPLIER
#define RESHADE_DEPTH_MULTIPLIER 1
#endif
#ifndef RESHADE_DEPTH_LINEARIZATION_FAR_PLANE
#define RESHADE_DEPTH_LINEARIZATION_FAR_PLANE 1000.0
#endif
// Above 1 expands coordinates, below 1 contracts and 1 is equal to no scaling on any axis
#ifndef RESHADE_DEPTH_INPUT_Y_SCALE
#define RESHADE_DEPTH_INPUT_Y_SCALE 1
#endif
#ifndef RESHADE_DEPTH_INPUT_X_SCALE
#define RESHADE_DEPTH_INPUT_X_SCALE 1
#endif
// An offset to add to the Y coordinate, (+) = move up, (-) = move down
#ifndef RESHADE_DEPTH_INPUT_Y_OFFSET
#define RESHADE_DEPTH_INPUT_Y_OFFSET 0
#endif
#ifndef RESHADE_DEPTH_INPUT_Y_PIXEL_OFFSET
#define RESHADE_DEPTH_INPUT_Y_PIXEL_OFFSET 0
#endif
// An offset to add to the X coordinate, (+) = move right, (-) = move left
#ifndef RESHADE_DEPTH_INPUT_X_OFFSET
#define RESHADE_DEPTH_INPUT_X_OFFSET 0
#endif
#ifndef RESHADE_DEPTH_INPUT_X_PIXEL_OFFSET
#define RESHADE_DEPTH_INPUT_X_PIXEL_OFFSET 0
#endif
#define BUFFER_PIXEL_SIZE float2(BUFFER_RCP_WIDTH, BUFFER_RCP_HEIGHT)
#define BUFFER_SCREEN_SIZE float2(BUFFER_WIDTH, BUFFER_HEIGHT)
#define BUFFER_ASPECT_RATIO (BUFFER_WIDTH * BUFFER_RCP_HEIGHT)
namespace ReShade
{
#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
// These are deprecated and will be removed eventually.
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; };
// Helper functions
float GetLinearizedDepth(float2 texcoord)
{
#if RESHADE_DEPTH_INPUT_IS_UPSIDE_DOWN
texcoord.y = 1.0 - texcoord.y;
#endif
texcoord.x /= RESHADE_DEPTH_INPUT_X_SCALE;
texcoord.y /= RESHADE_DEPTH_INPUT_Y_SCALE;
#if RESHADE_DEPTH_INPUT_X_PIXEL_OFFSET
texcoord.x -= RESHADE_DEPTH_INPUT_X_PIXEL_OFFSET * BUFFER_RCP_WIDTH;
#else // Do not check RESHADE_DEPTH_INPUT_X_OFFSET, since it may be a decimal number, which the preprocessor cannot handle
texcoord.x -= RESHADE_DEPTH_INPUT_X_OFFSET / 2.000000001;
#endif
#if RESHADE_DEPTH_INPUT_Y_PIXEL_OFFSET
texcoord.y += RESHADE_DEPTH_INPUT_Y_PIXEL_OFFSET * BUFFER_RCP_HEIGHT;
#else
texcoord.y += RESHADE_DEPTH_INPUT_Y_OFFSET / 2.000000001;
#endif
float depth = tex2Dlod(DepthBuffer, float4(texcoord, 0, 0)).x * RESHADE_DEPTH_MULTIPLIER;
#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);
return depth;
}
}
// Vertex shader generating a triangle covering the entire screen
// See also https://www.reddit.com/r/gamedev/comments/2j17wk/a_slightly_faster_bufferless_vertex_shader_trick/
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);
}