// Copyright 2009-2020 Intel Corporation
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include "math/spectrum.h"
#include "rkcommon/math/vec.ih"

typedef uniform float<SPECTRUM_SAMPLES> spectrum;

extern spectrum spectrum_sRGB_r;
extern spectrum spectrum_sRGB_g;
extern spectrum spectrum_sRGB_b;

inline uniform vec3f spectrum_sRGB(const uniform int l)
{
  return make_vec3f(spectrum_sRGB_r[l], spectrum_sRGB_g[l], spectrum_sRGB_b[l]);
}

// note: result can be <0 or >1
inline uniform vec3f spectrum2rgb(const spectrum &s)
{
  uniform vec3f rgb = make_vec3f(0.f);
  for (uniform int l = 0; l < SPECTRUM_SAMPLES; l++)
    rgb = rgb + s[l] * spectrum_sRGB(l);

  return rgb;
}