From 97b268b7f2a32b5917da5f7f1528619e2dcf362b Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Wed, 3 Dec 2025 16:32:59 -0800
Subject: add glitter uv channel

---
 2ner.shader   | 1 +
 glitter.cginc | 4 +++-
 globals.cginc | 1 +
 yum_pbr.cginc | 1 +
 4 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/2ner.shader b/2ner.shader
index dede8d4..937c560 100644
--- a/2ner.shader
+++ b/2ner.shader
@@ -2227,6 +2227,7 @@ Shader "yum_food/2ner"
         [HideInInspector] m_start_Glitter("Glitter", Float) = 0
           [ThryToggle(_GLITTER)] _Glitter_Enabled("Enable", Float) = 0
           [HDR] _Glitter_Color("Color", Color) = (1, 1, 1, 1)
+          [IntRange] _Glitter_UV_Channel("UV channel", Range(0, 3)) = 0
           _Glitter_Emission("Emission", Color) = (1, 1, 1, 1)
           _Glitter_Layers("Layers", Range(1, 5)) = 1
           _Glitter_Grid_Size("Grid size", Float) = 1
diff --git a/glitter.cginc b/glitter.cginc
index a8e6aad..e8df133 100644
--- a/glitter.cginc
+++ b/glitter.cginc
@@ -7,6 +7,7 @@
 
 struct GlitterParams {
     float4 color;
+    float2 uv_channel;
     uint layers;
     float cell_size;
     float size;
@@ -38,7 +39,8 @@ float4 getGlitter(v2f i, GlitterParams params, float3 normal) {
   float c_acc = 0;
   [loop]
   for (uint layer_i = 0; layer_i < params.layers; layer_i++) {
-    float2 p = i.uv01.xy + glitter_offset_vectors[layer_i] * params.cell_size * 0.5;
+    float2 uv = get_uv_by_channel(i, params.uv_channel);
+    float2 p = uv + glitter_offset_vectors[layer_i] * params.cell_size * 0.5;
 
     float3 cell_id = float3(floor(p / params.cell_size), layer_i);
     float cell_rand = rand3(cell_id*.0001);
diff --git a/globals.cginc b/globals.cginc
index 78f34cd..0c3b9ed 100644
--- a/globals.cginc
+++ b/globals.cginc
@@ -491,6 +491,7 @@ float _Focal_Length_Multiplier;
 
 #if defined(_GLITTER)
 float4 _Glitter_Color;
+float _Glitter_UV_Channel;
 float3 _Glitter_Emission;
 float _Glitter_Layers;
 float _Glitter_Grid_Size;
diff --git a/yum_pbr.cginc b/yum_pbr.cginc
index f70f056..cec42d2 100644
--- a/yum_pbr.cginc
+++ b/yum_pbr.cginc
@@ -271,6 +271,7 @@ YumPbr GetYumPbr(v2f i, float3x3 tangentToWorld) {
 #if (defined(FORWARD_BASE_PASS) || defined(FORWARD_ADD_PASS)) && defined(_GLITTER)
   GlitterParams glitter_p;
   glitter_p.color = _Glitter_Color;
+  glitter_p.uv_channel = _Glitter_UV_Channel;
   glitter_p.layers = _Glitter_Layers;
   glitter_p.cell_size = _Glitter_Grid_Size;
   glitter_p.size = _Glitter_Size;
-- 
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