88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
#ifndef INCLUDED_HITTABLE_H
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#define INCLUDED_HITTABLE_H
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#include "aabb.h"
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#include "arena.h"
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#include "material.h"
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#include "point3.h"
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#include "ray.h"
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#include "vec3.h"
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#include <stdbool.h>
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#include <stddef.h>
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typedef struct HitRecord {
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const Material *material;
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Point3 p;
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Vec3 normal;
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double u, v;
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double t;
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bool front_face;
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} HitRecord;
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void hit_record_set_face_normal(HitRecord *record, Ray r, Vec3 outward_normal);
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typedef enum HittableType {
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HITTABLE_LIST,
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HITTABLE_SPHERE,
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HITTABLE_MOVING_SPHERE,
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HITTABLE_BVH_NODE,
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} HittableType;
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typedef struct Hittable Hittable;
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typedef struct HittableList {
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const Hittable **objects;
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size_t size;
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size_t capacity;
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} HittableList;
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typedef struct Sphere {
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const Material *material;
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Point3 center;
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double radius;
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} Sphere;
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typedef struct MovingSphere {
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const Material *material;
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Point3 center_start, center_end;
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double start, end;
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double radius;
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} MovingSphere;
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typedef struct BVHNode {
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const Hittable *left;
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const Hittable *right;
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AABB box;
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} BVHNode;
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struct Hittable {
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HittableType type;
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union {
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HittableList list;
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Sphere sphere;
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MovingSphere moving_sphere;
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BVHNode bvh_node;
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};
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};
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Hittable *hittable_create_hittable_list(Arena *arena);
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Hittable *hittable_create_sphere(Point3 center, double radius,
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const Material *material, Arena *arena);
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Hittable *hittable_create_moving_sphere(Point3 center_start, Point3 center_end,
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double start, double end, double radius,
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const Material *material, Arena *arena);
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Hittable *hittable_create_bvh_node(const Hittable **objects, size_t start,
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size_t end, double time_start,
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double time_end, Arena *arena);
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bool hittable_hit(const Hittable *hittable, Ray r, double t_min, double t_max,
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HitRecord *record);
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bool hittable_bounding_box(const Hittable *hittable, double time_start,
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double time_end, AABB *bounding_box);
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void hittable_list_add(HittableList *list, const Hittable *hittable,
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Arena *arena);
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#endif /* INCLUDED_HITTABLE_H */
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