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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
texture BackBufferTex : COLOR;
sampler BackBuffer { Texture = BackBufferTex; };
uniform float Timer < source = "timer"; > = 0.0;
uniform float Horizon <
ui_type = "slider";
ui_label = "Reflection Line";
ui_tooltip = "Height on screen where the reflective floor begins. Everything above it is left untouched.";
ui_min = 0.0; ui_max = 1.0; ui_step = 0.01;
> = 0.55;
uniform float Amount <
ui_type = "slider";
ui_label = "Amount";
ui_tooltip = "How strongly the reflection shows through the floor.";
ui_min = 0.0; ui_max = 1.0; ui_step = 0.05;
> = 0.35;
uniform float Falloff <
ui_type = "slider";
ui_label = "Falloff";
ui_tooltip = "How quickly the reflection fades as the floor comes towards the viewer. At zero it stays even.";
ui_min = 0.0; ui_max = 4.0; ui_step = 0.1;
> = 1.2;
uniform float Perspective <
ui_type = "slider";
ui_label = "Perspective";
ui_tooltip = "Stretches or squashes the mirrored image. One is a true mirror, higher values pull it towards the line.";
ui_min = 0.2; ui_max = 2.0; ui_step = 0.05;
> = 1.0;
uniform float Ripple <
ui_type = "slider";
ui_label = "Ripple";
ui_tooltip = "Amplitude of the waves disturbing the reflection. At zero the mirror is perfectly still.";
ui_min = 0.0; ui_max = 1.0; ui_step = 0.05;
> = 0.0;
uniform float RippleSpeed <
ui_type = "slider";
ui_label = "Ripple Speed";
ui_tooltip = "How fast the waves travel.";
ui_min = 0.0; ui_max = 4.0; ui_step = 0.1;
> = 1.0;
void VS_PostProcess(in uint id : SV_VertexID, out float4 pos : SV_Position, out float2 uv : TEXCOORD)
{
uv = float2(float(id & 2), float((id & 1) << 1));
pos = float4(uv * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);
}
float4 PS_Reflections(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
{
float3 color = tex2D(BackBuffer, uv).rgb;
float depth = uv.y - Horizon;
float on_floor = step(0.0, depth);
float span = max(1.0 - Horizon, 0.001);
float distance_down = saturate(depth / span);
float seconds = Timer * 0.001;
float wave = sin(uv.x * 38.0 + seconds * RippleSpeed * 2.0) *
sin(uv.y * 21.0 - seconds * RippleSpeed * 1.3);
float2 disturbance = float2(wave * 0.004, wave * 0.002) * Ripple * distance_down;
float2 mirrored = float2(uv.x, Horizon - depth * Perspective) + disturbance;
float3 reflection = tex2D(BackBuffer, saturate(mirrored)).rgb;
float fade = pow(max(1.0 - distance_down, 0.0001), Falloff);
float strength = Amount * fade * on_floor;
return float4(lerp(color, reflection, strength), 1.0);
}
technique Reflections <
ui_label = "Reflections";
ui_tooltip = "Mirrors the picture into a reflective floor below a line you choose, with optional water ripples.";
>
{
pass
{
VertexShader = VS_PostProcess;
PixelShader = PS_Reflections;
}
}
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