From eb532c4aa678f278d795d0c6d7ccd1c09a24bc0a Mon Sep 17 00:00:00 2001
From: Masataka SUMI <santarh@gmail.com>
Date: Thu, 15 Jul 2021 19:47:22 +0900
Subject: [PATCH] Add Pbr Correct mode.

---
 .../Resources/VRM10/vrmc_materials_mtoon_define.hlsl  |  6 ++++++
 .../VRM10/vrmc_materials_mtoon_lighting_mtoon.hlsl    | 11 +++++++++++
 2 files changed, 17 insertions(+)

diff --git a/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_define.hlsl b/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_define.hlsl
index cb983736f..fcd7c8d64 100644
--- a/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_define.hlsl
+++ b/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_define.hlsl
@@ -18,6 +18,12 @@
     #define MTOON_IS_FRONT_VFACE(VAL, FRONT, BACK) ((VAL > 0.0) ? (FRONT) : (BACK))
 #endif
 
+// Compile-time constant
+inline bool MToon_IsPbrCorrectOn()
+{
+    return false;
+}
+
 // Compile-time constant
 inline bool MToon_IsForwardBasePass()
 {
diff --git a/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_lighting_mtoon.hlsl b/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_lighting_mtoon.hlsl
index bee7da2dd..ca7ea9eaa 100644
--- a/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_lighting_mtoon.hlsl
+++ b/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_lighting_mtoon.hlsl
@@ -38,6 +38,12 @@ inline half GetMToonLighting_Shade(const UnityLighting lighting, const MToonInpu
     const half shadeShift = GetMToonLighting_Reflectance_ShadingShift(input);
     const half shadeToony = _ShadingToonyFactor;
 
+    if (MToon_IsPbrCorrectOn())
+    {
+        const half shadeInput = dotNL;
+        return mtoon_linearstep(-1.0 + shadeToony, +1.0 - shadeToony, shadeInput + shadeShift);
+    }
+
     if (MToon_IsForwardBasePass())
     {
         const half shadeInput = lerp(-1, 1, mtoon_linearstep(-1, 1, dotNL) * lighting.directLightAttenuation);
@@ -52,6 +58,11 @@ inline half GetMToonLighting_Shade(const UnityLighting lighting, const MToonInpu
 
 inline half GetMToonLighting_Shadow(const UnityLighting lighting, const half dotNL)
 {
+    if (MToon_IsPbrCorrectOn())
+    {
+        return lighting.directLightAttenuation * (min(0, dotNL) + 1);
+    }
+
     if (MToon_IsForwardBasePass())
     {
         return 1;