External/HIP/workload/ray-tracing/InOneWeekend/hittable.h

#ifndef HITTABLE_H
#define HITTABLE_H
//==============================================================================================
// Originally written in 2016 by Peter Shirley <ptrshrl@gmail.com>
//
// To the extent possible under law, the author(s) have dedicated all copyright
// and related and neighboring rights to this software to the public domain
// worldwide. This software is distributed without any warranty.
//
// You should have received a copy (see file COPYING.txt) of the CC0 Public
// Domain Dedication along with this software. If not, see
// <http://creativecommons.org/publicdomain/zero/1.0/>.
//
// The original source code is from
//    https://github.com/RayTracing/raytracing.github.io/tree/release/src/InOneWeekend
//
// Changes to the original code follow the following license.
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//==============================================================================================

#include "rtweekend.h"

class material;

class hit_record {
public:
  point3 p;
  vec3 normal;
  SharedPtr<material> mat;
  double t;
  bool front_face;

  __host__ __device__ void set_face_normal(const ray &r,
                                           const vec3 &outward_normal) {
    // Sets the hit record normal vector.
    // NOTE: the parameter `outward_normal` is assumed to have unit length.

    front_face = dot(r.direction(), outward_normal) < 0;
    normal = front_face ? outward_normal : -outward_normal;
  }
};

class hittable {
public:
  __host__ __device__ virtual ~hittable() = default;

  __host__ __device__ virtual bool hit(const ray &r, interval ray_t,
                                       hit_record &rec) const = 0;
};

#endif