From f478606867d42e971c5fa83803f3255e922e6a8a Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Sun, 23 Feb 2025 02:24:39 -0800
Subject: add ltcgi, alpha multiplier

---
 yum_lighting.cginc | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'yum_lighting.cginc')

diff --git a/yum_lighting.cginc b/yum_lighting.cginc
index 758fdb2..4effd1e 100644
--- a/yum_lighting.cginc
+++ b/yum_lighting.cginc
@@ -9,6 +9,38 @@
 #include "features.cginc"
 #include "yum_pbr.cginc"
 
+// fucking kill me
+#ifndef __LTCGI_INC
+#define __LTCGI_INC
+
+#include "features.cginc"
+
+#if defined(_LTCGI)
+struct ltcgi_acc {
+  float3 diffuse;
+  float3 specular;
+};
+
+#include "Third_Party/at.pimaker.ltcgi/Shaders/LTCGI_structs.cginc"
+
+void ltcgi_cb_diffuse(inout ltcgi_acc acc, in ltcgi_output output);
+void ltcgi_cb_specular(inout ltcgi_acc acc, in ltcgi_output output);
+
+#define LTCGI_V2_CUSTOM_INPUT ltcgi_acc
+#define LTCGI_V2_DIFFUSE_CALLBACK ltcgi_cb_diffuse
+#define LTCGI_V2_SPECULAR_CALLBACK ltcgi_cb_specular
+
+#include "Third_Party/at.pimaker.ltcgi/Shaders/LTCGI.cginc"
+void ltcgi_cb_diffuse(inout ltcgi_acc acc, in ltcgi_output output) {
+	acc.diffuse += output.intensity * output.color * _LTCGI_DiffuseColor;
+}
+void ltcgi_cb_specular(inout ltcgi_acc acc, in ltcgi_output output) {
+	acc.specular += output.intensity * output.color * _LTCGI_SpecularColor;
+}
+#endif  // _LTCGI
+
+#endif  // __LTCGI_INC
+
 struct YumLighting {
 	float3 view_dir;
 	float3 dir;
@@ -132,6 +164,19 @@ YumLighting GetYumLighting(v2f i, YumPbr pbr) {
 
   light.specular = getIndirectSpecular(i, pbr, light.view_dir);
 
+#if defined(_LTCGI)
+  ltcgi_acc acc = (ltcgi_acc) 0;
+  LTCGI_Contribution(
+      acc,
+      i.worldPos,
+      pbr.normal,
+      light.view_dir,
+      pbr.roughness_perceptual,
+      0);
+  light.diffuse += acc.diffuse * _LTCGI_Strength;
+  light.specular += acc.specular * _LTCGI_Strength;
+#endif
+
 #if defined(_QUANTIZE_SPECULAR)
   float specular_luminance = dot(light.specular, float3(0.2126, 0.7152, 0.0722));  // convert to luminance
   light.specular = light.specular * floor(specular_luminance * _Quantize_Specular_Steps) / _Quantize_Specular_Steps;
-- 
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