Add three more decal slots

1 files changed, 150 insertions, 0 deletions

diff --git a/decal.cginc b/decal.cginc
index 8492c74..5f60fe7 100644
--- a/decal.cginc
+++ b/decal.cginc
@@ -78,6 +78,156 @@ void applyDecals(v2f i, inout Pbr pbr) {
 #endif  // _DECAL0_METALLIC_GLOSS
   }
 #endif
+
+#if defined(_DECAL1)
+  {
+    float2 uv = get_uv_by_channel(i, _Decal1_UV_Channel);
+    uv -= _Decal1_MainTex_ST.zw;
+    uv *= _Decal1_MainTex_ST.xy;
+#if defined(_DECAL1_ROTATION)
+    uv = decal_rotate(uv, _Decal1_Rotation);
+#endif
+    float4 albedo = decal_sample(_Decal1_MainTex, uv, _Decal1_UV_Mode);
+    albedo *= _Decal1_Color;
+    albedo.a *= _Decal1_Opacity;
+
+#if defined(_DECAL1_MASK)
+    float2 mask_uv = get_uv_by_channel(i, _Decal1_Mask_UV_Channel);
+    mask_uv -= _Decal1_Mask_ST.zw;
+    mask_uv *= _Decal1_Mask_ST.xy;
+    float mask = decal_sample(_Decal1_Mask, mask_uv, _Decal1_UV_Mode);
+#if defined(_DECAL1_MASK_INVERT)
+    mask = 1 - mask;
+#endif  // _DECAL1_MASK_INVERT
+    albedo.a *= mask;
+#endif  // _DECAL1_MASK
+
+#if defined(_DECAL1_ALBEDO_CLAMP)
+    albedo.rgb = saturate(albedo.rgb);
+#endif  // _DECAL1_ALBEDO_CLAMP
+
+    [forcecase]
+    switch (_Decal1_Mix_Mode) {
+      case DECAL_MIX_MODE_ALPHA_BLEND:
+        pbr.albedo = alpha_blend(albedo, pbr.albedo);
+        break;
+      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;
+    }
+
+#if defined(_DECAL1_METALLIC_GLOSS)
+    float4 mg = decal_sample(_Decal1_Metallic_Gloss, uv, _Decal1_UV_Mode);
+    pbr.metallic = lerp(pbr.metallic, mg.r, albedo.a);
+    pbr.smoothness = lerp(pbr.smoothness, mg.a, albedo.a);
+    pbr.roughness_perceptual = clamp(1 - pbr.smoothness, MIN_PERCEPTUAL_ROUGHNESS, 1);
+    pbr.roughness = clamp(pbr.roughness_perceptual * pbr.roughness_perceptual, MIN_ROUGHNESS, 1);
+#endif  // _DECAL1_METALLIC_GLOSS
+  }
+#endif
+
+#if defined(_DECAL2)
+  {
+    float2 uv = get_uv_by_channel(i, _Decal2_UV_Channel);
+    uv -= _Decal2_MainTex_ST.zw;
+    uv *= _Decal2_MainTex_ST.xy;
+#if defined(_DECAL2_ROTATION)
+    uv = decal_rotate(uv, _Decal2_Rotation);
+#endif
+    float4 albedo = decal_sample(_Decal2_MainTex, uv, _Decal2_UV_Mode);
+    albedo *= _Decal2_Color;
+    albedo.a *= _Decal2_Opacity;
+
+#if defined(_DECAL2_MASK)
+    float2 mask_uv = get_uv_by_channel(i, _Decal2_Mask_UV_Channel);
+    mask_uv -= _Decal2_Mask_ST.zw;
+    mask_uv *= _Decal2_Mask_ST.xy;
+    float mask = decal_sample(_Decal2_Mask, mask_uv, _Decal2_UV_Mode);
+#if defined(_DECAL2_MASK_INVERT)
+    mask = 1 - mask;
+#endif  // _DECAL2_MASK_INVERT
+    albedo.a *= mask;
+#endif  // _DECAL2_MASK
+
+#if defined(_DECAL2_ALBEDO_CLAMP)
+    albedo.rgb = saturate(albedo.rgb);
+#endif  // _DECAL2_ALBEDO_CLAMP
+
+    [forcecase]
+    switch (_Decal2_Mix_Mode) {
+      case DECAL_MIX_MODE_ALPHA_BLEND:
+        pbr.albedo = alpha_blend(albedo, pbr.albedo);
+        break;
+      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;
+    }
+
+#if defined(_DECAL2_METALLIC_GLOSS)
+    float4 mg = decal_sample(_Decal2_Metallic_Gloss, uv, _Decal2_UV_Mode);
+    pbr.metallic = lerp(pbr.metallic, mg.r, albedo.a);
+    pbr.smoothness = lerp(pbr.smoothness, mg.a, albedo.a);
+    pbr.roughness_perceptual = clamp(1 - pbr.smoothness, MIN_PERCEPTUAL_ROUGHNESS, 1);
+    pbr.roughness = clamp(pbr.roughness_perceptual * pbr.roughness_perceptual, MIN_ROUGHNESS, 1);
+#endif  // _DECAL2_METALLIC_GLOSS
+  }
+#endif
+
+#if defined(_DECAL3)
+  {
+    float2 uv = get_uv_by_channel(i, _Decal3_UV_Channel);
+    uv -= _Decal3_MainTex_ST.zw;
+    uv *= _Decal3_MainTex_ST.xy;
+#if defined(_DECAL3_ROTATION)
+    uv = decal_rotate(uv, _Decal3_Rotation);
+#endif
+    float4 albedo = decal_sample(_Decal3_MainTex, uv, _Decal3_UV_Mode);
+    albedo *= _Decal3_Color;
+    albedo.a *= _Decal3_Opacity;
+
+#if defined(_DECAL3_MASK)
+    float2 mask_uv = get_uv_by_channel(i, _Decal3_Mask_UV_Channel);
+    mask_uv -= _Decal3_Mask_ST.zw;
+    mask_uv *= _Decal3_Mask_ST.xy;
+    float mask = decal_sample(_Decal3_Mask, mask_uv, _Decal3_UV_Mode);
+#if defined(_DECAL3_MASK_INVERT)
+    mask = 1 - mask;
+#endif  // _DECAL3_MASK_INVERT
+    albedo.a *= mask;
+#endif  // _DECAL3_MASK
+
+#if defined(_DECAL3_ALBEDO_CLAMP)
+    albedo.rgb = saturate(albedo.rgb);
+#endif  // _DECAL3_ALBEDO_CLAMP
+
+    [forcecase]
+    switch (_Decal3_Mix_Mode) {
+      case DECAL_MIX_MODE_ALPHA_BLEND:
+        pbr.albedo = alpha_blend(albedo, pbr.albedo);
+        break;
+      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;
+    }
+
+#if defined(_DECAL3_METALLIC_GLOSS)
+    float4 mg = decal_sample(_Decal3_Metallic_Gloss, uv, _Decal3_UV_Mode);
+    pbr.metallic = lerp(pbr.metallic, mg.r, albedo.a);
+    pbr.smoothness = lerp(pbr.smoothness, mg.a, albedo.a);
+    pbr.roughness_perceptual = clamp(1 - pbr.smoothness, MIN_PERCEPTUAL_ROUGHNESS, 1);
+    pbr.roughness = clamp(pbr.roughness_perceptual * pbr.roughness_perceptual, MIN_ROUGHNESS, 1);
+#endif  // _DECAL3_METALLIC_GLOSS
+  }
+#endif
 }
 
 #endif  // __DECAL_INC