More decal features

1 files changed, 20 insertions, 0 deletions

diff --git a/decal.cginc b/decal.cginc
index 69fb9e5..7673bee 100644
--- a/decal.cginc
+++ b/decal.cginc
@@ -39,6 +39,23 @@ void applyDecals(v2f i, inout Pbr pbr) {
     float4 albedo = decal_sample(_Decal0_MainTex, uv, _Decal0_UV_Mode);
     albedo *= _Decal0_Color;
     albedo.a *= _Decal0_Opacity;
+
+#if defined(_DECAL0_MASK)
+    float2 mask_uv = get_uv_by_channel(i, _Decal0_Mask_UV_Channel);
+    mask_uv -= _Decal0_Mask_ST.zw;
+    mask_uv *= _Decal0_Mask_ST.xy;
+    // For now, mask gets the same sampling mode as the decal.
+    float mask = decal_sample(_Decal0_Mask, mask_uv, _Decal0_UV_Mode);
+#if defined(_DECAL0_MASK_INVERT)
+    mask = 1 - mask;
+#endif  // _DECAL0_MASK_INVERT
+    albedo.a *= mask;
+#endif  // _DECAL0_MASK
+
+#if defined(_DECAL0_ALBEDO_CLAMP)
+    albedo.rgb = saturate(albedo.rgb);
+#endif  // _DECAL0_ALBEDO_CLAMP
+
     [forcecase]
     switch (_Decal0_Mix_Mode) {
       case DECAL_MIX_MODE_ALPHA_BLEND:
@@ -47,6 +64,9 @@ void applyDecals(v2f i, inout Pbr pbr) {
       case DECAL_MIX_MODE_MULTIPLY:
         pbr.albedo.rgb *= lerp(1, albedo.rgb, albedo.a);
         break;
+      case DECAL_MIX_MODE_ADD_PRODUCT:
+        pbr.albedo.rgb += lerp(0, albedo.rgb * pbr.albedo.rgb, albedo.a);
+        break;
     }
   }
 #endif