add detail map feature

1 files changed, 11 insertions, 0 deletions

diff --git a/pbr.cginc b/pbr.cginc
index cb6b079..73ff970 100644
--- a/pbr.cginc
+++ b/pbr.cginc
@@ -4,6 +4,7 @@
 #include "filamented.cginc"
 #include "globals.cginc"
 #include "interpolators.cginc"
+#include "texture_utils.cginc"
 
 struct Pbr {
   float4 albedo;
@@ -63,6 +64,16 @@ Pbr getPbr(v2f i) {
 
   float3 normal_tangent = UnpackNormal(_BumpMap.Sample(aniso16_trilinear_repeat_s, i.uv01.xy * _BumpMap_ST.xy));
   normal_tangent.xy *= _BumpScale;
+
+#if defined(_DETAILS)
+  float2 detail_uv = get_uv_by_channel(i, _Details_UV_Channel);
+  float3 detail_normal = UnpackNormal(_DetailNormalMap.Sample(aniso16_trilinear_repeat_s, detail_uv * _DetailNormalMap_ST.xy));
+  detail_normal.xy *= _DetailNormalMapScale;
+  float detail_mask = _DetailMask.Sample(aniso16_trilinear_repeat_s, detail_uv * _DetailMask_ST.xy).r;
+  detail_normal.xy *= detail_mask;
+  normal_tangent = blendNormalsHill12(normal_tangent, detail_normal);
+#endif
+
   // 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);