Jean-Michel Gorius
9b0abbc5bb
Using explicit pointer casts silences some compiler warnings that may introduce subtle bugs in the code. The union approach is the officially documented way of doing type punning, so there is no reason not to use it.
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
#ifndef INCLUDED_MATERIAL_H
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#define INCLUDED_MATERIAL_H
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#include "arena.h"
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#include "color.h"
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#include "ray.h"
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#include <stdbool.h>
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struct HitRecord;
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typedef enum MaterialType {
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MATERIAL_LAMBERTIAN,
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MATERIAL_METAL,
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MATERIAL_DIELECTRIC,
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} MaterialType;
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typedef struct Lambertian {
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Color albedo;
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} Lambertian;
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typedef struct Metal {
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Color albedo;
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double fuzziness;
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} Metal;
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typedef struct Dielectric {
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double eta;
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} Dielectric;
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typedef struct Material {
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MaterialType type;
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union {
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Lambertian lambertian;
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Metal metal;
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Dielectric dielectric;
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};
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} Material;
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bool material_scatter(const Material *material, Ray r,
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const struct HitRecord *record, Color *attenuation,
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Ray *scattered);
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Material *material_create_lambertian(Color albedo, Arena *arena);
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bool lambertian_scatter(const Lambertian *lambertian, Ray r,
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const struct HitRecord *record, Color *attenuation,
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Ray *scattered);
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Material *material_create_metal(Color albedo, double fuzziness, Arena *arena);
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bool metal_scatter(const Metal *metal, Ray r, const struct HitRecord *record,
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Color *attenuation, Ray *scattered);
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Material *material_create_dielectric(double eta, Arena *arena);
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bool dielectric_scatter(const Dielectric *dielectric, Ray r,
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const struct HitRecord *record, Color *attenuation,
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Ray *scattered);
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#endif /* INCLUDED_MATERIAL_H */
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