From d85594a46c6dc4e6e8dfa02d05bbef5b43757938 Mon Sep 17 00:00:00 2001
From: Rezmason <jeremysachs@rezmason.net>
Date: Fri, 30 Sep 2022 00:11:22 -0700
Subject: [PATCH] Vertically offsetting glyph columns by a random fraction of
 the height of a glyph when the volumetric mode is on, to prevent odd visual
 alignments

---
 shaders/glsl/rainPass.vert.glsl | 3 +++
 shaders/wgsl/rainPass.wgsl      | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/shaders/glsl/rainPass.vert.glsl b/shaders/glsl/rainPass.vert.glsl
index e11d5d8..42b40eb 100644
--- a/shaders/glsl/rainPass.vert.glsl
+++ b/shaders/glsl/rainPass.vert.glsl
@@ -34,6 +34,9 @@ void main() {
 		vDepth = quadDepth;
 	}
 	vec2 position = (aPosition * vec2(1., glyphVerticalSpacing) + aCorner * vec2(density, 1.)) * quadSize;
+	if (volumetric) {
+		position.y += rand(vec2(aPosition.x, 1.)) * quadSize.y;
+	}
 	vec4 pos = vec4((position - 0.5) * 2.0, quadDepth, 1.0);
 
 	// Convert the world space position to screen space
diff --git a/shaders/wgsl/rainPass.wgsl b/shaders/wgsl/rainPass.wgsl
index 1db791f..2ff58b7 100644
--- a/shaders/wgsl/rainPass.wgsl
+++ b/shaders/wgsl/rainPass.wgsl
@@ -388,6 +388,9 @@ fn computeEffect (simTime : f32, isFirstFrame : bool, glyphPos : vec2<f32>, scre
 	// Calculate the vertex's world space position
 	var worldPosition = quadPosition * vec2<f32>(1.0, config.glyphVerticalSpacing);
 	worldPosition += quadCorner * vec2<f32>(config.density, 1.0);
+	if (volumetric) {
+		worldPosition.y += randomFloat(vec2(quadPosition.x, 1.0));
+	}
 	worldPosition /= quadGridSize;
 	worldPosition = (worldPosition - 0.5) * 2.0;