From 8c6e9be61b2a7b1c5b9e5b61252090a4e2432ce2 Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Thu, 7 Aug 2025 18:59:23 -0700
Subject: add base color, normal, and metallic gloss textures

---
 pbr.cginc | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

(limited to 'pbr.cginc')

diff --git a/pbr.cginc b/pbr.cginc
index 156fba2..1677ccc 100644
--- a/pbr.cginc
+++ b/pbr.cginc
@@ -8,6 +8,7 @@
 struct Pbr {
   float4 albedo;
   float3 normal;
+  float3x3 tbn;
   float smoothness;
   float roughness_perceptual;
   float roughness;
@@ -40,13 +41,23 @@ void apply_marble(float3 world_pos, inout float3 albedo) {
 
 Pbr getPbr(v2f i) {
   Pbr pbr = (Pbr) 0;
-  pbr.normal = normalize(i.normal);
-  pbr.albedo = _Color;
-  pbr.smoothness = _Smoothness;
-  propagateSmoothness(pbr);
+
+  pbr.albedo = _MainTex.Sample(trilinear_repeat_s, i.uv0 * _MainTex_ST.xy);
+  pbr.albedo *= _Color;
   apply_marble(i.worldPos, pbr.albedo.xyz);
 
-  pbr.metallic = _Metallic;
+  float3 normal_tangent = UnpackNormal(_BumpMap.Sample(trilinear_repeat_s, i.uv0 * _BumpMap_ST.xy));
+  normal_tangent.xy *= _BumpScale;
+  // Map from tangent space to world space.
+  float3 bitangent = cross(i.normal, i.tangent.xyz) * i.tangent.w;
+  pbr.tbn = float3x3(i.tangent.xyz, bitangent, i.normal);
+  pbr.normal = normalize(mul(normal_tangent, pbr.tbn));
+
+  float4 metallic_gloss = _MetallicGlossMap.Sample(trilinear_repeat_s, i.uv0 * _MetallicGlossMap_ST.xy);
+  pbr.smoothness = metallic_gloss.a * _Glossiness;
+  pbr.metallic = metallic_gloss.r * _Metallic;
+
+  propagateSmoothness(pbr);
   return pbr;
 }
 
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