From 272141d93324f32c15b7e230b0e37d122a418f54 Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Fri, 15 Apr 2022 18:03:14 +0800
Subject: Add fuzzy reflective material.

---
 material_reflective.h | 39 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

(limited to 'material_reflective.h')

diff --git a/material_reflective.h b/material_reflective.h
index 91afa7c..64e6457 100644
--- a/material_reflective.h
+++ b/material_reflective.h
@@ -8,15 +8,44 @@
 #include "vec.h"
 #include "material.h"
 
-// metal
-class material_reflective : public material {
+template<bool cond>
+struct s_fuzzy_ {
+    // non-fuzzy material does not need these variables
+    // we remove them with an empty struct
+};
+
+template<>
+struct s_fuzzy_<true> {
+    double f; // how fuzzy the material is
+    // those are parameters that only fuzzy materials have
+};
+
+// metal with perfectly smooth surface
+template<bool Fuzzy>
+class material_reflective_ : public material {
     vec3d albedo;
+    s_fuzzy_<Fuzzy> fuzzy_;
 public:
-    explicit material_reflective(vec3d &color) : albedo(color) {}
-    explicit material_reflective(vec3d &&color) : albedo(color) {}
-    explicit material_reflective(double color) : albedo{color, color, color} {}
+    // FIXME conditionally enable these constructors by template parameter `Fuzzy`.
+
+    // Non-fuzzy constructors
+    explicit material_reflective_(vec3d &color) : albedo(color), fuzzy_{} {}
+
+    explicit material_reflective_(vec3d &&color) : albedo(color), fuzzy_{} {}
+
+    explicit material_reflective_(double color) : albedo{color, color, color}, fuzzy_{} {}
+
+    // Fuzzy constructors, with special parameters
+    explicit material_reflective_(vec3d &color, double f) : albedo(color), fuzzy_{f} {}
+
+    explicit material_reflective_(vec3d &&color, double f) : albedo(color), fuzzy_{f} {}
+
+    explicit material_reflective_(double color, double f) : albedo{color, color, color}, fuzzy_{f} {}
 
     bool scatter(ray3d &r, const object &hit_obj, double hit_t, random_uv_gen_3d &ruvg) const override;
 };
 
+using material_reflective = material_reflective_<false>;
+using material_fuzzy_reflective = material_reflective_<true>;
+
 #endif //RT_MATERIAL_REFLECTIVE_H
-- 
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