From 9de5794afed8c67e93bc9aecad6f3cb518b3d0b8 Mon Sep 17 00:00:00 2001
From: Stenzek <stenzek@gmail.com>
Date: Sun, 29 Sep 2024 17:11:56 +1000
Subject: [PATCH] Data: Add replacement scanlines shader

---
 .../shaders/dolphinfx/scanlines.glsl          | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 data/resources/shaders/dolphinfx/scanlines.glsl

diff --git a/data/resources/shaders/dolphinfx/scanlines.glsl b/data/resources/shaders/dolphinfx/scanlines.glsl
new file mode 100644
index 000000000..a5b41a65e
--- /dev/null
+++ b/data/resources/shaders/dolphinfx/scanlines.glsl
@@ -0,0 +1,65 @@
+/*
+[configuration]
+
+[OptionRangeFloat]
+GUIName = Active Line Brightness
+OptionName = BRIGHTEN
+MinValue = 0.1
+MaxValue = 2.0
+StepAmount = 0.1
+DefaultValue = 1.1
+
+[OptionRangeFloat]
+GUIName = Inactive Line Darkness
+OptionName = DARKEN
+MinValue = 0.1
+MaxValue = 1.0
+StepAmount = 0.01
+DefaultValue = 0.5
+
+[OptionRangeFloat]
+GUIName = Scanline Thickness
+OptionName = THICKNESS
+MinValue = 0.1
+MaxValue = 1.0
+StepAmount = 0.01
+DefaultValue = 0.5
+
+[OptionRangeFloat]
+GUIName = Scanline Spacing
+OptionName = SPACING
+MinValue = 0.1
+MaxValue = 1.0
+StepAmount = 0.01
+DefaultValue = 0.25
+
+[/configuration]
+*/
+
+float3 RGBToYUV(float3 rgb)
+{
+  return float3(dot(rgb.rgb, float3(0.299, 0.587, 0.114)),
+                dot(rgb.rgb, float3(-0.14713, -0.28886, 0.436)),
+                dot(rgb.rgb, float3(0.615, -0.51499, -0.10001)));
+}
+
+float3 YUVToRGB(float3 yuv)
+{
+  return float3(dot(yuv, float3(1.0f, 0.0, 1.13983)),
+                dot(yuv, float3(1.0f, -0.39465, -0.58060)),
+                dot(yuv, float3(1.0f, 2.03211, 0.0)));
+}
+
+void main()
+{
+  float2 pos = GetFragCoord();
+  float4 color = Sample();
+  float3 yuv = RGBToYUV(color.rgb);
+
+  float thickness = GetOption(THICKNESS);
+  float spacing = GetOption(SPACING);
+  yuv.r *= (frac(pos.y * spacing) > thickness) ? (1.0 - GetOption(DARKEN)) : GetOption(BRIGHTEN);
+
+  color.rgb = YUVToRGB(yuv);
+  SetOutput(color);
+}