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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2019 Blender Foundation.
* All rights reserved.
*/
#include "usd_writer_light.h"
#include "usd_hierarchy_iterator.h"
#include <pxr/usd/usdLux/diskLight.h>
#include <pxr/usd/usdLux/distantLight.h>
#include <pxr/usd/usdLux/rectLight.h>
#include <pxr/usd/usdLux/sphereLight.h>
extern "C" {
#include "BLI_assert.h"
#include "BLI_utildefines.h"
#include "DNA_light_types.h"
#include "DNA_object_types.h"
}
namespace USD {
USDLightWriter::USDLightWriter(const USDExporterContext &ctx) : USDAbstractWriter(ctx)
{
}
bool USDLightWriter::is_supported(const HierarchyContext *context) const
{
Light *light = static_cast<Light *>(context->object->data);
return ELEM(light->type, LA_AREA, LA_LOCAL, LA_SUN);
}
void USDLightWriter::do_write(HierarchyContext &context)
{
pxr::UsdStageRefPtr stage = usd_export_context_.stage;
const pxr::SdfPath &usd_path = usd_export_context_.usd_path;
pxr::UsdTimeCode timecode = get_export_time_code();
Light *light = static_cast<Light *>(context.object->data);
pxr::UsdLuxLight usd_light;
switch (light->type) {
case LA_AREA:
switch (light->area_shape) {
case LA_AREA_DISK:
case LA_AREA_ELLIPSE: { /* An ellipse light will deteriorate into a disk light. */
pxr::UsdLuxDiskLight disk_light = pxr::UsdLuxDiskLight::Define(stage, usd_path);
disk_light.CreateRadiusAttr().Set(light->area_size, timecode);
usd_light = disk_light;
break;
}
case LA_AREA_RECT: {
pxr::UsdLuxRectLight rect_light = pxr::UsdLuxRectLight::Define(stage, usd_path);
rect_light.CreateWidthAttr().Set(light->area_size, timecode);
rect_light.CreateHeightAttr().Set(light->area_sizey, timecode);
usd_light = rect_light;
break;
}
case LA_AREA_SQUARE: {
pxr::UsdLuxRectLight rect_light = pxr::UsdLuxRectLight::Define(stage, usd_path);
rect_light.CreateWidthAttr().Set(light->area_size, timecode);
rect_light.CreateHeightAttr().Set(light->area_size, timecode);
usd_light = rect_light;
break;
}
}
break;
case LA_LOCAL: {
pxr::UsdLuxSphereLight sphere_light = pxr::UsdLuxSphereLight::Define(stage, usd_path);
sphere_light.CreateRadiusAttr().Set(light->area_size, timecode);
usd_light = sphere_light;
break;
}
case LA_SUN:
usd_light = pxr::UsdLuxDistantLight::Define(stage, usd_path);
break;
default:
BLI_assert(!"is_supported() returned true for unsupported light type");
}
/* Scale factor to get to somewhat-similar illumination. Since the USDViewer had similar
* over-exposure as Blender Internal with the same values, this code applies the reverse of the
* versioning code in light_emission_unify(). */
float usd_intensity;
if (light->type == LA_SUN) {
/* Untested, as the Hydra GL viewport of USDViewer doesn't support distant lights. */
usd_intensity = light->energy;
}
else {
usd_intensity = light->energy / 100.f;
}
usd_light.CreateIntensityAttr().Set(usd_intensity, timecode);
usd_light.CreateColorAttr().Set(pxr::GfVec3f(light->r, light->g, light->b), timecode);
usd_light.CreateSpecularAttr().Set(light->spec_fac, timecode);
}
} // namespace USD
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