Optimize sh9 implementation

Saves ~20 instructions (572 -> 552).

1 files changed, 5 insertions, 3 deletions

diff --git a/brdf.cginc b/brdf.cginc
index 12f2770..5a24307 100644
--- a/brdf.cginc
+++ b/brdf.cginc
@@ -55,6 +55,7 @@ float G_GGXSmith(float roughness, float NoL, float NoV) {
   return rcp(denom);
 }
 
+#if defined(_CLOTH_SHEEN)
 // Estevez "Production Friendly Microfacet Sheen BRDF"
 // Equation 2.
 // The original equation is:
@@ -113,6 +114,7 @@ float G_Cloth(float roughness, float LoH) {
   // Apply terminator softening (equation 4).
   return pow(lambda, 1.0f + 2.0f * pow(one_minus_LoH, 8));
 }
+#endif
 
 float4 brdf(Pbr pbr, LightData data) {
   float3 specular = 0;
@@ -134,7 +136,7 @@ float4 brdf(Pbr pbr, LightData data) {
 #endif
 
   // Direct
-  if (true) {
+  {
     float remainder = 1.0f;
 
 #if defined(_CLEARCOAT)
@@ -180,7 +182,7 @@ float4 brdf(Pbr pbr, LightData data) {
 
   // Indirect
 #if defined(FORWARD_BASE_PASS)
-  if (true) {
+  {
     float remainder = 1.0f;
     float2 dfg_uv = float2(data.common.NoV, pbr.roughness);
 
@@ -212,7 +214,7 @@ float4 brdf(Pbr pbr, LightData data) {
     // For energy conservation with the diffuse term, we use the view-dependent Fresnel.
     float3 F = F_Schlick(data.common.NoV, f0_spec, 1.0f);
     remainder *= (1.0f - F);
-
+    
     // Diffuse is Lambertian, which is pre-integrated into the SH diffuse probe
     float3 indirect_diffuse = pbr.albedo.xyz * data.indirect.diffuse * remainder * (1.0 - pbr.metallic);
     diffuse  += indirect_diffuse;