1 files changed, 48 insertions, 0 deletions
diff --git a/material.h b/material.h
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+++ b/material.h
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+//
+// Created by Keuin on 2022/4/15.
+//
+
+#ifndef RT_MATERIAL_H
+#define RT_MATERIAL_H
+
+#include "object.h"
+
+class object;
+
+// A material is of some characteristics that manipulates the lighted ray in some certain ways.
+// An object can have one certain subclass of material, making it seemed to be different with other objects.
+// A material instance can be configured when constructing. It should be immutable and thread-safe.
+// It is suggested not to have mutable states in its internal implementation.
+// User should have a global table containing references to all the materials the scene is using.
+class material {
+public:
+    // If this matter scatters, manipulate r and return true. Otherwise return false (the light is absorbed entirely).
+    // To make it thread-safe without locking mechanism, private states are passed-in as parameters.
+    virtual bool scatter(ray3d &r, const object &hit_obj, double hit_t, random_uv_gen_3d &ruvg) const = 0;
+};
+
+class material_diffuse_lambertian : public material {
+    double albedo;
+public:
+    explicit material_diffuse_lambertian(double albedo);
+
+    bool scatter(ray3d &r, const object &hit_obj, double hit_t, random_uv_gen_3d &ruvg) const override;
+};
+
+class material_diffuse_simple : public material {
+    double albedo;
+public:
+    explicit material_diffuse_simple(double albedo);
+
+    bool scatter(ray3d &r, const object &hit_obj, double hit_t, random_uv_gen_3d &ruvg) const override;
+};
+
+class material_diffuse_hemispherical : public material {
+    double albedo;
+public:
+    explicit material_diffuse_hemispherical(double albedo);
+
+    bool scatter(ray3d &r, const object &hit_obj, double hit_t, random_uv_gen_3d &ruvg) const override;
+};
+
+#endif //RT_MATERIAL_H