From 3d3f2127a95dac364b2f3b521717c3d684c12901 Mon Sep 17 00:00:00 2001
From: Aljoscha Krettek <aljoscha.krettek@gmail.com>
Date: Mon, 6 Jan 2025 15:00:44 +0100
Subject: [PATCH] renderer/metal: demonstrate alpha "gain" for thickening fonts

---
 src/renderer/shaders/cell.metal | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/renderer/shaders/cell.metal b/src/renderer/shaders/cell.metal
index 995a5a8bc..115416cbc 100644
--- a/src/renderer/shaders/cell.metal
+++ b/src/renderer/shaders/cell.metal
@@ -365,6 +365,12 @@ fragment float4 cell_text_fragment(
 
       // Then premult the texture color
       float a = textureGrayscale.sample(textureSampler, in.tex_coord).r;
+
+      // Demonstrate how we can thicken fonts by applying some "gain" to the
+      // alpha we get from the texture.
+      //
+      // We could make this a configurable knob.
+      a = pow(a, 1 / 3.0f);
       premult = premult * a;
       return premult;