Add missing light builder functions

Author: Sopiro

cli/light_builder.cpp

@@ -60,6 +60,24 @@ DiffuseAreaLight* CreateDiffuseAreaLight(Scene& scene, const Primitive* primitiv
     return scene.CreateLight<DiffuseAreaLight>(primitive, CreateSpectrumConstantTexture(scene, emission), two_sided);
 }
 
+SpotAreaLight* CreateSpotAreaLight(
+    Scene& scene, const Primitive* primitive, const Spectrum& emission, Float angle_max, Float angle_falloff_start, bool two_sided
+)
+{
+    return scene.CreateLight<SpotAreaLight>(
+        primitive, CreateSpectrumConstantTexture(scene, emission), angle_max, angle_falloff_start, two_sided
+    );
+}
+
+SpotAreaLight* CreateSpotAreaLight(
+    Scene& scene, const Primitive* primitive, Float emission, Float angle_max, Float angle_falloff_start, bool two_sided
+)
+{
+    return scene.CreateLight<SpotAreaLight>(
+        primitive, CreateSpectrumConstantTexture(scene, emission), angle_max, angle_falloff_start, two_sided
+    );
+}
+
 DirectionalAreaLight* CreateDirectionalAreaLight(
     Scene& scene, const Primitive* primitive, const Spectrum& emission, bool two_sided
 )

cli/light_builder.h

@@ -56,21 +56,36 @@ DiffuseAreaLight* CreateDiffuseAreaLight(
     const Spectrum& emission,
     bool two_sided
 );
-
 DiffuseAreaLight* CreateDiffuseAreaLight(
     Scene& scene,
     const Primitive* primitive,
     Float emission,
     bool two_sided
 );
 
-DirectionalAreaLight* CreateDirectionalAreaLight(
+SpotAreaLight* CreateSpotAreaLight(
     Scene& scene,
     const Primitive* primitive,
     const Spectrum& emission,
+    Float angle_max,
+    Float angle_falloff_start,
+    bool two_sided
+);
+SpotAreaLight* CreateSpotAreaLight(
+    Scene& scene,
+    const Primitive* primitive,
+    Float emission,
+    Float angle_max,
+    Float angle_falloff_start,
     bool two_sided
 );
 
+DirectionalAreaLight* CreateDirectionalAreaLight(
+    Scene& scene,
+    const Primitive* primitive,
+    const Spectrum& emission,
+    bool two_sided
+);
 DirectionalAreaLight* CreateDirectionalAreaLight(
     Scene& scene,
     const Primitive* primitive,
@@ -80,12 +95,12 @@ DirectionalAreaLight* CreateDirectionalAreaLight(
 
 UniformInfiniteLight* CreateUniformInfiniteLight(
     Scene& scene,
-    const Spectrum& l,
+    const Spectrum& intensity,
     Float scale = 1
 );
 UniformInfiniteLight* CreateUniformInfiniteLight(
     Scene& scene,
-    Float l,
+    Float intensity,
     Float scale = 1
 );
 

src/bxdf/microfacet.cpp

@@ -240,7 +240,7 @@ void PrepareReflectanceTextures(int32 texture_size, int32 num_samples)
 {
     if (!fs::exists(folder))
     {
-        fs::create_directory(folder);
+        fs::create_directories(folder);
     }
 
     int32 x_samples = int32(std::sqrt(num_samples));