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// Copyright 2009 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "SpotLight.h"
#include "math/sampling.h"
#ifndef OSPRAY_TARGET_SYCL
#include "lights/SpotLight_ispc.h"
#else
namespace ispc {
void SpotLight_Transform(const void *self, const void *xfm, void *dyn);
void *SpotLight_sample_addr();
void *SpotLight_sample_instanced_addr();
void *SpotLight_eval_addr();
void *SpotLight_eval_instanced_addr();
} // namespace ispc
#endif
// ispc shared
#include "SpotLightShared.h"
#include "common/InstanceShared.h"
namespace ospray {
ispc::Light *SpotLight::createSh(uint32_t, const ispc::Instance *instance) const
{
ispc::SpotLight *sh =
StructSharedCreate<ispc::SpotLight>(getISPCDevice().getDRTDevice());
#ifndef OSPRAY_TARGET_SYCL
sh->super.sample =
reinterpret_cast<ispc::Light_SampleFunc>(ispc::SpotLight_sample_addr());
sh->super.eval =
reinterpret_cast<ispc::Light_EvalFunc>(ispc::SpotLight_eval_addr());
#endif
sh->super.isVisible = visible;
sh->super.instance = instance;
sh->pre.position = position;
sh->pre.direction = normalize(direction);
intensityDistribution.setSh(sh->intensityDistribution);
// Enable dynamic runtime instancing or apply static transformation
if (instance) {
sh->pre.c0 = intensityDistribution.c0;
if (instance->motionBlur) {
#ifndef OSPRAY_TARGET_SYCL
sh->super.sample = reinterpret_cast<ispc::Light_SampleFunc>(
ispc::SpotLight_sample_instanced_addr());
sh->super.eval = reinterpret_cast<ispc::Light_EvalFunc>(
ispc::SpotLight_eval_instanced_addr());
#endif
} else
ispc::SpotLight_Transform(&sh->pre, instance->xfm, &sh->pre);
} else {
sh->pre.c90 = normalize(cross(intensityDistribution.c0, sh->pre.direction));
sh->pre.c0 = cross(sh->pre.direction, sh->pre.c90);
}
sh->radiance = radiance;
sh->intensity = radIntensity;
sh->cosAngleMax = cosAngleMax;
sh->cosAngleScale = cosAngleScale;
sh->radius = radius;
sh->innerRadius = innerRadius;
sh->areaPdf = uniformSampleRingPDF(radius, innerRadius);
return &sh->super;
}
std::string SpotLight::toString() const
{
return "ospray::SpotLight";
}
void SpotLight::commit()
{
Light::commit();
position = getParam<vec3f>("position", vec3f(0.f));
direction = getParam<vec3f>("direction", vec3f(0.f, 0.f, 1.f));
float openingAngle = getParam<float>("openingAngle", 180.f);
float penumbraAngle = getParam<float>("penumbraAngle", 5.f);
radius = max(0.0f, getParam<float>("radius", 0.f));
innerRadius =
clamp(getParam<float>("innerRadius", 0.f), 0.0f, 0.999f * radius);
// per default perpendicular to direction
intensityDistribution.c0 = std::abs(direction.x) < std::abs(direction.y)
? vec3f(0.0f, direction.z, direction.y)
: vec3f(direction.z, 0.0f, direction.x);
intensityDistribution.readParams(*this);
// check ranges and pre-compute parameters
openingAngle = clamp(openingAngle, 0.f, 360.f);
penumbraAngle = clamp(penumbraAngle, 0.f, 0.5f * openingAngle);
cosAngleMax = std::cos(deg2rad(0.5f * openingAngle));
const float cosAngleMin =
std::cos(deg2rad(0.5f * openingAngle - penumbraAngle));
cosAngleScale = 1.0f / (cosAngleMin - cosAngleMax);
queryIntensityQuantityType(intensityDistribution
? OSP_INTENSITY_QUANTITY_SCALE
: OSP_INTENSITY_QUANTITY_INTENSITY);
processIntensityQuantityType(openingAngle);
}
void SpotLight::processIntensityQuantityType(const float openingAngle)
{
radIntensity = 0.0f;
radiance = 0.0f;
const float halfOpeningAngleRad = M_PI * (openingAngle * 0.5f) / 180.0f;
const float cosHalfOpeningAngle = cos(halfOpeningAngleRad);
const auto sqr = [](const float f) { return f * f; };
const float ringDiskArea = M_PI * (sqr(radius) - sqr(innerRadius));
const float sphericalCapCosInt = M_PI * (1.0f - sqr(cosHalfOpeningAngle));
// converting from the chosen intensity quantity type to radiance
if (intensityDistribution
? intensityQuantity == OSP_INTENSITY_QUANTITY_SCALE
: intensityQuantity == OSP_INTENSITY_QUANTITY_INTENSITY) {
radIntensity = coloredIntensity;
if (radius > 0.0f)
radiance = radIntensity / ringDiskArea;
return;
}
if (!intensityDistribution) {
if (intensityQuantity == OSP_INTENSITY_QUANTITY_POWER) {
// since our spot light implementation includes the cosine term we need
// to consider the integrated cosine cap instead of the usually used
// integrated cap
radIntensity = coloredIntensity / sphericalCapCosInt;
if (radius > 0.0f)
radiance = coloredIntensity / (sphericalCapCosInt * ringDiskArea);
return;
}
if (intensityQuantity == OSP_INTENSITY_QUANTITY_RADIANCE) {
// a virtual spot light has no surface area therefore radIntensity stays 0
if (radius > 0.0f)
radiance = coloredIntensity;
return;
}
}
postStatusMsg(OSP_LOG_WARNING)
<< toString() << " unsupported 'intensityQuantity' value";
}
} // namespace ospray
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