tutorial.h

/* 
 * Copyright (c) 2018, 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 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 ``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 THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <optixu/optixu_math_namespace.h>
#include <optixu/optixu_matrix_namespace.h>
#include <common.h>
#include <optix.h>
#include <optix_math.h>
// Used by all the tutorial cuda files

#define RADIANCE_RAY_TYPE 0
#define SHADOW_RAY_TYPE 1

#include <optixu/optixu_vector_types.h>

using namespace optix;

#define FLT_MAX         1e30;

static __device__ __inline__ float3 exp( const float3& x )
{
  return make_float3(exp(x.x), exp(x.y), exp(x.z));
}

static __device__ __inline__ float step( float min, float value )
{
  return value<min?0:1;
}

static __device__ __inline__ float3 mix( float3 a, float3 b, float x )
{
  return a*(1-x) + b*x;
}

static __device__ __inline__ float3 schlick( float nDi, const float3& rgb )
{
  float r = fresnel_schlick(nDi, 5, rgb.x, 1);
  float g = fresnel_schlick(nDi, 5, rgb.y, 1);
  float b = fresnel_schlick(nDi, 5, rgb.z, 1);
  return make_float3(r, g, b);
}

static __device__ __inline__ uchar4 make_color(const float3& c)
{
    return make_uchar4( static_cast<unsigned char>(__saturatef(c.z)*255.99f),  // B
                        static_cast<unsigned char>(__saturatef(c.y)*255.99f),  // G
                        static_cast<unsigned char>(__saturatef(c.x)*255.99f),  // R
                        255u);                                                 // A
}

// custom per ray data radiance
struct PerRayData_radiance
{
  float alpha_ray;
  float3 result;
  float  importance;
  int depth;

  float3 normal_output;
  float normal_total_weight;

  float3 albedo_output;

  int id_noise;

  unsigned int seed;
};

struct PerRayData_shadow
{
  float3 attenuation;
};