ray.h

/*
 * Fermat
 *
 * Copyright (c) 2016-2019, NVIDIA CORPORATION. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    * Neither the name of the NVIDIA CORPORATION nor the
 *      names of its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "types.h"

#include <optix_prime/optix_prime.h>
#include <cuda_runtime.h>


struct Ray
{
  static const RTPbufferformat format = RTP_BUFFER_FORMAT_RAY_ORIGIN_TMIN_DIRECTION_TMAX;

  float3 origin;
  float  tmin;
  float3 dir;
  float  tmax;
};

struct MaskedRay
{
  static const RTPbufferformat format = RTP_BUFFER_FORMAT_RAY_ORIGIN_MASK_DIRECTION_TMAX;

  float3 origin;
  uint32 mask;
  float3 dir;
  float  tmax;
};

struct Hit
{
  static const RTPbufferformat format = RTP_BUFFER_FORMAT_HIT_T_TRIID_U_V;

  float t;
  int   triId;
  float u;
  float v;
};

struct HitInstancing
{
  static const RTPbufferformat format = RTP_BUFFER_FORMAT_HIT_T_TRIID_INSTID_U_V;

  float t;
  int   triId;
  int   instId;
  float u;
  float v;
};

FERMAT_HOST_DEVICE FERMAT_FORCEINLINE
Ray make_ray(
    const float3 origin,
    const float3 dir,
    const float tmin,
    const float tmax)
{
    Ray r;
    r.origin    = origin;
    r.tmin      = tmin;
    r.dir       = dir;
    r.tmax      = tmax;
    return r;
}

FERMAT_HOST_DEVICE FERMAT_FORCEINLINE
MaskedRay make_ray(
    const float3 origin,
    const float3 dir,
    const uint32 mask,
    const float tmax)
{
    MaskedRay r;
    r.origin    = origin;
    r.mask      = mask;
    r.dir       = dir;
    r.tmax      = tmax;
    return r;
}

FERMAT_HOST_DEVICE FERMAT_FORCEINLINE
Hit make_hit(
    const float t,
    const int   triId,
    const float u,
    const float v)
{
    Hit r;
    r.t     = t;
    r.triId = triId;
    r.u     = u;
    r.v     = v;
    return r;
}