add compile-time switch to alpha blend decal reflections

1 files changed, 41 insertions, 16 deletions

diff --git a/decals.cginc b/decals.cginc
index e789b62..37b1196 100644
--- a/decals.cginc
+++ b/decals.cginc
@@ -233,10 +233,12 @@ float3 calculateSdfSsn(DecalParams params, float2 decal_uv, float4 decal_albedo)
 

 #define APPLY_DECAL_BLEND_MODE_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, emission, params)   \

     decal_albedo.a = lerp(0, decal_albedo.a, params.opacity);                                       \

+    float alpha_blend_amount = (1.0f - albedo.a) * decal_albedo.a; \

     albedo = alphaBlend(albedo, decal_albedo);

 

 #define APPLY_DECAL_BLEND_MODE_ALPHA_BLEND_INVERTED(i, albedo, normal_tangent, metallic, smoothness, emission, params)   \

     decal_albedo.a = lerp(0, decal_albedo.a, params.opacity);                                       \

+    float alpha_blend_amount = (1.0f - albedo.a) * decal_albedo.a; \

     albedo = alphaBlend(decal_albedo, albedo);

 

 #define APPLY_DECAL_BLEND_MODE_REPLACE(i, albedo, normal_tangent, metallic, smoothness, emission, params)       \

@@ -263,11 +265,16 @@ float3 calculateSdfSsn(DecalParams params, float2 decal_uv, float4 decal_albedo)
 

 #define APPLY_DECAL_NORMAL_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, params) {}

 

-#define APPLY_DECAL_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, emission, params)   \

+#define APPLY_DECAL_REFLECTIONS_ON_REGULAR(i, albedo, normal_tangent, metallic, smoothness, emission, params)   \

     float4 metallic_gloss = params.metallicGlossMap.Sample(trilinear_repeat_s, decal_uv);              \

     metallic = lerp(metallic, metallic_gloss.r * params.metallic_value, decal_albedo.a);            \

     smoothness = lerp(smoothness, metallic_gloss.a * params.smoothness_value, decal_albedo.a);

 

+#define APPLY_DECAL_REFLECTIONS_ON_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, emission, params)   \

+    float4 metallic_gloss = params.metallicGlossMap.Sample(trilinear_repeat_s, decal_uv);              \

+    metallic = lerp(metallic, metallic_gloss.r * params.metallic_value, decal_albedo.a * alpha_blend_amount);            \

+    smoothness = lerp(smoothness, metallic_gloss.a * params.smoothness_value, decal_albedo.a * alpha_blend_amount);

+

 #define APPLY_DECAL_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, params) {}

 

 #define APPLY_DECAL_SDF_SSN_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, params) {}

@@ -344,8 +351,10 @@ void applyDecals(in v2f i, inout float4 albedo, inout float3 normal_tangent, ino
         emission += tmp_emission;

         #endif

 

-        #if defined(_DECAL0_REFLECTIONS)

-        APPLY_DECAL_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #if defined(_DECAL0_REFLECTIONS) && !defined(_DECAL0_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_REGULAR(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #elif defined(_DECAL0_REFLECTIONS) && defined(_DECAL0_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #else

         APPLY_DECAL_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #endif

@@ -421,8 +430,10 @@ void applyDecals(in v2f i, inout float4 albedo, inout float3 normal_tangent, ino
         emission += tmp_emission;

         #endif

 

-        #if defined(_DECAL1_REFLECTIONS)

-        APPLY_DECAL_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #if defined(_DECAL1_REFLECTIONS) && !defined(_DECAL1_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_REGULAR(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #elif defined(_DECAL1_REFLECTIONS) && defined(_DECAL1_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #else

         APPLY_DECAL_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #endif

@@ -498,7 +509,11 @@ void applyDecals(in v2f i, inout float4 albedo, inout float3 normal_tangent, ino
         emission += tmp_emission;

         #endif

 

-        #if defined(_DECAL2_REFLECTIONS)

+        #if defined(_DECAL2_REFLECTIONS) && !defined(_DECAL2_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_REGULAR(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #elif defined(_DECAL2_REFLECTIONS) && defined(_DECAL2_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #else

         APPLY_DECAL_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #else

         APPLY_DECAL_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

@@ -575,8 +590,10 @@ void applyDecals(in v2f i, inout float4 albedo, inout float3 normal_tangent, ino
         emission += tmp_emission;

         #endif

 

-        #if defined(_DECAL3_REFLECTIONS)

-        APPLY_DECAL_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #if defined(_DECAL3_REFLECTIONS) && !defined(_DECAL3_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_REGULAR(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #elif defined(_DECAL3_REFLECTIONS) && defined(_DECAL3_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #else

         APPLY_DECAL_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #endif

@@ -652,8 +669,10 @@ void applyDecals(in v2f i, inout float4 albedo, inout float3 normal_tangent, ino
         emission += tmp_emission;

         #endif

 

-        #if defined(_DECAL4_REFLECTIONS)

-        APPLY_DECAL_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #if defined(_DECAL4_REFLECTIONS) && !defined(_DECAL4_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_REGULAR(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #elif defined(_DECAL4_REFLECTIONS) && defined(_DECAL4_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #else

         APPLY_DECAL_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #endif

@@ -729,8 +748,10 @@ void applyDecals(in v2f i, inout float4 albedo, inout float3 normal_tangent, ino
         emission += tmp_emission;

         #endif

 

-        #if defined(_DECAL5_REFLECTIONS)

-        APPLY_DECAL_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #if defined(_DECAL5_REFLECTIONS) && !defined(_DECAL5_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_REGULAR(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #elif defined(_DECAL5_REFLECTIONS) && defined(_DECAL5_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #else

         APPLY_DECAL_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #endif

@@ -806,8 +827,10 @@ void applyDecals(in v2f i, inout float4 albedo, inout float3 normal_tangent, ino
         emission += tmp_emission;

         #endif

 

-        #if defined(_DECAL6_REFLECTIONS)

-        APPLY_DECAL_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #if defined(_DECAL6_REFLECTIONS) && !defined(_DECAL6_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_REGULAR(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #elif defined(_DECAL6_REFLECTIONS) && defined(_DECAL6_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #else

         APPLY_DECAL_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #endif

@@ -883,8 +906,10 @@ void applyDecals(in v2f i, inout float4 albedo, inout float3 normal_tangent, ino
         emission += tmp_emission;

         #endif

 

-        #if defined(_DECAL7_REFLECTIONS)

-        APPLY_DECAL_REFLECTIONS_ON(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #if defined(_DECAL7_REFLECTIONS) && !defined(_DECAL7_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_REGULAR(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

+        #elif defined(_DECAL7_REFLECTIONS) && defined(_DECAL7_REFLECTIONS_ALPHA_BLEND)

+        APPLY_DECAL_REFLECTIONS_ON_ALPHA_BLEND(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #else

         APPLY_DECAL_REFLECTIONS_OFF(i, albedo, normal_tangent, metallic, smoothness, emission, decal);

         #endif