From bd2de37b84f0efba95468643d78a35a255040dc4 Mon Sep 17 00:00:00 2001
From: Jay Oster <jay@kodewerx.org>
Date: Sat, 4 Dec 2021 09:08:29 -0800
Subject: [PATCH] Use Fused-Multiply-Add (#232)

- There are a few places in the `simple-invaders` crate that could use
  `f32::mul_add()` as well.
---
 examples/custom-shader/shaders/noise.wgsl | 2 +-
 shaders/scale.wgsl                        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/custom-shader/shaders/noise.wgsl b/examples/custom-shader/shaders/noise.wgsl
index 4ede4b4..e2a7d7a 100644
--- a/examples/custom-shader/shaders/noise.wgsl
+++ b/examples/custom-shader/shaders/noise.wgsl
@@ -10,7 +10,7 @@ fn vs_main(
     [[location(0)]] position: vec2<f32>,
 ) -> VertexOutput {
     var out: VertexOutput;
-    out.tex_coord = position * vec2<f32>(0.5, -0.5) + 0.5;
+    out.tex_coord = fma(position, vec2<f32>(0.5, -0.5), vec2<f32>(0.5, 0.5));
     out.position = vec4<f32>(position, 0.0, 1.0);
     return out;
 }
diff --git a/shaders/scale.wgsl b/shaders/scale.wgsl
index dc7bfce..48004eb 100644
--- a/shaders/scale.wgsl
+++ b/shaders/scale.wgsl
@@ -15,7 +15,7 @@ fn vs_main(
     [[location(0)]] position: vec2<f32>,
 ) -> VertexOutput {
     var out: VertexOutput;
-    out.tex_coord = position * vec2<f32>(0.5, -0.5) + 0.5;
+    out.tex_coord = fma(position, vec2<f32>(0.5, -0.5), vec2<f32>(0.5, 0.5));
     out.position = r_locals.transform * vec4<f32>(position, 0.0, 1.0);
     return out;
 }