From cebd6877bba985b1716b70dc9afd0e6614b36903 Mon Sep 17 00:00:00 2001
From: Rezmason <jeremysachs@rezmason.net>
Date: Fri, 12 Nov 2021 00:03:06 -0800
Subject: [PATCH] Just learned about the private storage class. The rain pass
 can use it to look up the corner positions of quads, rather than derive them
 mathematically.

---
 shaders/wgsl/rainPass.wgsl | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/shaders/wgsl/rainPass.wgsl b/shaders/wgsl/rainPass.wgsl
index 971e283..256ac48 100644
--- a/shaders/wgsl/rainPass.wgsl
+++ b/shaders/wgsl/rainPass.wgsl
@@ -285,6 +285,11 @@ fn computeResult (isFirstFrame : bool, previousResult : vec4<f32>, glyphPos : ve
 
 // Vertex shader
 
+var<private> quadCorners : array<vec2<f32>, NUM_VERTICES_PER_QUAD> = array<vec2<f32>, NUM_VERTICES_PER_QUAD>(
+	vec2<f32>(0.0, 0.0), vec2<f32>(1.0, 0.0), vec2<f32>(0.0, 1.0),
+	vec2<f32>(1.0, 1.0), vec2<f32>(0.0, 1.0), vec2<f32>(1.0, 0.0)
+);
+
 [[stage(vertex)]] fn vertMain(input : VertInput) -> VertOutput {
 
 	var volumetric = bool(config.volumetric);
@@ -295,10 +300,7 @@ fn computeResult (isFirstFrame : bool, previousResult : vec4<f32>, glyphPos : ve
 	var i = i32(input.index);
 	var quadIndex = i / NUM_VERTICES_PER_QUAD;
 
-	var quadCorner = vec2<f32>(
-		f32(i % 2),
-		f32((i + 1) % NUM_VERTICES_PER_QUAD / 3)
-	);
+	var quadCorner = quadCorners[i % NUM_VERTICES_PER_QUAD];
 
 	var quadPosition = vec2<f32>(
 		f32(quadIndex % i32(quadGridSize.x)),