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// Copyright 2020 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
// ospray
#include "SunSkyLight.h"
#include "texture/Texture2D.h"
#ifndef OSPRAY_TARGET_SYCL
// ispc exports
#include "lights/HDRILight_ispc.h"
#else
namespace ispc {
void HDRILight_initDistribution(const void *map, void *distribution);
}
#endif
// ispc shared
#include "DirectionalLightShared.h"
#include "HDRILightShared.h"
namespace ospray {
SunSkyLight::SunSkyLight(api::ISPCDevice &device)
: Light(device, FFO_LIGHT_HDRI | FFO_LIGHT_DIRECTIONAL)
{
static const int skyResolution = 512;
this->skySize = vec2i(skyResolution, skyResolution / 2);
this->skyImage = devicert::make_buffer_shared_unique<vec3f>(
getISPCDevice().getDRTDevice(), skySize.product());
static auto format = static_cast<OSPTextureFormat>(OSP_TEXTURE_RGB32F);
static auto filter = static_cast<OSPTextureFilter>(OSP_TEXTURE_FILTER_LINEAR);
map = new Texture2D(getISPCDevice());
map->refDec();
void *data = skyImage->data();
map->getSh()->set(skySize,
&data,
0,
format,
filter,
vec2ui(OSP_TEXTURE_WRAP_REPEAT, OSP_TEXTURE_WRAP_CLAMP_TO_EDGE));
}
ispc::Light *SunSkyLight::createSh(
uint32_t index, const ispc::Instance *instance) const
{
switch (index) {
case 0: {
ispc::HDRILight *sh =
StructSharedCreate<ispc::HDRILight>(getISPCDevice().getDRTDevice());
sh->set(visible,
instance,
coloredIntensity,
frame,
map->getSh(),
distribution->getSh());
return &sh->super;
}
case 1: {
ispc::DirectionalLight *sh = StructSharedCreate<ispc::DirectionalLight>(
getISPCDevice().getDRTDevice());
sh->set(visible, instance, direction, solarIrradiance, cosAngle);
return &sh->super;
}
default:
assert(false && "Incorrect SunSky sublight index");
}
return nullptr;
}
std::string SunSkyLight::toString() const
{
return "ospray::SunSkyLight";
}
void SunSkyLight::commit()
{
Light::commit();
const float lambdaMin = 320.0f;
const float lambdaMax = 720.0f;
const vec3f up = normalize(getParam<vec3f>("up", vec3f(0.f, 1.f, 0.f)));
direction = -normalize(getParam<vec3f>("direction", vec3f(0.f, -1.f, 0.f)));
const float albedo = clamp(getParam<float>("albedo", 0.3f), 0.1f, 1.f);
const float turbidity = clamp(getParam<float>("turbidity", 3.f), 1.f, 10.f);
const float horizon =
clamp(getParam<float>("horizonExtension", 0.01f), 0.0f, 1.f);
const float sunTheta = dot(up, direction);
queryIntensityQuantityType(OSP_INTENSITY_QUANTITY_SCALE);
processIntensityQuantityType();
frame.vz = up;
if (std::abs(sunTheta) > 0.99f) {
const vec3f dx0 = vec3f(0.0f, up.z, -up.y);
const vec3f dx1 = vec3f(-up.z, 0.0f, up.x);
frame.vx = normalize(std::abs(up.x) < std::abs(up.y) ? dx0 : dx1);
frame.vy = cross(up, frame.vx);
} else {
frame.vy = normalize(cross(-direction, frame.vz));
frame.vx = cross(frame.vy, frame.vz);
}
// clamp sun to horizon
if (sunTheta < 0)
direction = frame.vx;
// sun doesn't go beneath the horizon as theta clamped to pi/2
const float sunThetaMax = min(std::acos(sunTheta), (float)pi * 0.999f / 2.0f);
const float sunPhi = pi;
const float sunElevation = (float)pi / 2.0f - sunThetaMax;
ArHosekSkyModelState *spectralModel =
arhosekskymodelstate_alloc_init(sunElevation, turbidity, albedo);
// angular diameter of the sun in degrees
// using this value produces matching solar irradiance results from the model
// and directional light
const float angularDiameter = 0.53;
solarIrradiance = zero;
// calculate solar radiance
for (int i = 0; i < cieSize; ++i) {
if (cieLambda[i] >= lambdaMin && cieLambda[i] <= lambdaMax) {
float r = arhosekskymodel_solar_radiance_internal2(
spectralModel, cieLambda[i], sunElevation, 1);
solarIrradiance += r * cieXyz(i);
}
}
arhosekskymodelstate_free(spectralModel);
cosAngle = std::cos(deg2rad(0.5f * angularDiameter));
const float rcpPdf = 2 * (float)pi * (1 - cosAngle);
// convert solar radiance to solar irradiance
solarIrradiance =
xyzToRgb(solarIrradiance) * rcpPdf * intensityScale * coloredIntensity;
ArHosekSkyModelState *rgbModel =
arhosek_rgb_skymodelstate_alloc_init(turbidity, albedo, sunElevation);
tasking::parallel_for(skySize.y, [&](int y) {
for (int x = 0; x < skySize.x; x++) {
float theta = (y + 0.5) / skySize.y * float(pi);
const size_t index = skySize.x * y + x;
// const size_t index = skySize.x * y + x * 3;
vec3f skyRadiance = zero;
const float maxTheta = 0.999 * float(pi) / 2.0;
const float maxThetaHorizon = (horizon + 1.0) * float(pi) / 2.0;
if (theta <= maxThetaHorizon) {
float shadow = (horizon > 0.f)
? float(
clamp((maxThetaHorizon - theta) / (maxThetaHorizon - maxTheta),
0.f,
1.f))
: 1.f;
theta = min(theta, maxTheta);
float phi = ((x + 0.5) / skySize.x - 0.5) * (2.0 * (float)pi);
float cosGamma = cos(theta) * cos(sunThetaMax)
+ sin(theta) * sin(sunThetaMax) * cos(phi - sunPhi);
float gamma = std::acos(clamp(cosGamma, -1.f, 1.f));
float rgbData[3];
for (int i = 0; i < 3; ++i) {
rgbData[i] =
arhosek_tristim_skymodel_radiance(rgbModel, theta, gamma, i);
}
skyRadiance = vec3f(rgbData[0], rgbData[1], rgbData[2]);
skyRadiance = skyRadiance * shadow;
skyRadiance *= intensityScale;
}
skyImage->data()[index] = max(skyRadiance, vec3f(0.0f));
}
});
arhosekskymodelstate_free(rgbModel);
// recreate distribution
distribution = new Distribution2D(skySize, getISPCDevice());
// Release extra local ref
distribution->refDec();
ispc::HDRILight_initDistribution(map->getSh(), distribution->getSh());
}
void SunSkyLight::processIntensityQuantityType()
{
// validate the correctness of the light quantity type
if (intensityQuantity == OSP_INTENSITY_QUANTITY_SCALE) {
coloredIntensity = getParam<vec3f>("color", vec3f(1.f));
intensityScale = getParam<float>("intensity", 0.025f);
} else {
postStatusMsg(OSP_LOG_WARNING)
<< toString() << " unsupported 'intensityQuantity' value";
coloredIntensity = vec3f(0.0f);
}
}
} // namespace ospray
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