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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2022 NVIDIA Corporation
* Copyright 2022 Blender Foundation */
#include "hydra/camera.h"
#include "scene/camera.h"
#include <pxr/base/gf/frustum.h>
#include <pxr/imaging/hd/sceneDelegate.h>
#include <pxr/usd/usdGeom/tokens.h>
HDCYCLES_NAMESPACE_OPEN_SCOPE
extern Transform convert_transform(const GfMatrix4d &matrix);
HdCyclesCamera::HdCyclesCamera(const SdfPath &sprimId) : HdCamera(sprimId)
{
#if PXR_VERSION >= 2102
// Synchronize default values
_horizontalAperture = _data.GetHorizontalAperture() * GfCamera::APERTURE_UNIT;
_verticalAperture = _data.GetVerticalAperture() * GfCamera::APERTURE_UNIT;
_horizontalApertureOffset = _data.GetHorizontalApertureOffset() * GfCamera::APERTURE_UNIT;
_verticalApertureOffset = _data.GetVerticalApertureOffset() * GfCamera::APERTURE_UNIT;
_focalLength = _data.GetFocalLength() * GfCamera::FOCAL_LENGTH_UNIT;
_clippingRange = _data.GetClippingRange();
_fStop = _data.GetFStop();
_focusDistance = _data.GetFocusDistance();
#endif
}
HdCyclesCamera::~HdCyclesCamera()
{
}
HdDirtyBits HdCyclesCamera::GetInitialDirtyBitsMask() const
{
return DirtyBits::AllDirty;
}
void HdCyclesCamera::Sync(HdSceneDelegate *sceneDelegate,
HdRenderParam *renderParam,
HdDirtyBits *dirtyBits)
{
if (*dirtyBits == DirtyBits::Clean) {
return;
}
VtValue value;
const SdfPath &id = GetId();
#if PXR_VERSION >= 2102
if (*dirtyBits & DirtyBits::DirtyTransform) {
sceneDelegate->SampleTransform(id, &_transformSamples);
for (size_t i = 0; i < _transformSamples.count; ++i) {
if (_transformSamples.times[i] == 0.0f) {
_transform = _transformSamples.values[i];
_data.SetTransform(_transform);
break;
}
}
}
#else
if (*dirtyBits & DirtyBits::DirtyViewMatrix) {
sceneDelegate->SampleTransform(id, &_transformSamples);
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->worldToViewMatrix);
if (!value.IsEmpty()) {
_worldToViewMatrix = value.Get<GfMatrix4d>();
_worldToViewInverseMatrix = _worldToViewMatrix.GetInverse();
_data.SetTransform(_worldToViewInverseMatrix);
}
}
#endif
if (*dirtyBits & DirtyBits::DirtyProjMatrix) {
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->projectionMatrix);
if (!value.IsEmpty()) {
_projectionMatrix = value.Get<GfMatrix4d>();
const float focalLength = _data.GetFocalLength(); // Get default focal length
#if PXR_VERSION >= 2102
_data.SetFromViewAndProjectionMatrix(GetViewMatrix(), _projectionMatrix, focalLength);
#else
if (_projectionMatrix[2][3] < -0.5) {
_data.SetProjection(GfCamera::Perspective);
const float horizontalAperture = (2.0 * focalLength) / _projectionMatrix[0][0];
_data.SetHorizontalAperture(horizontalAperture);
_data.SetHorizontalApertureOffset(0.5 * horizontalAperture * _projectionMatrix[2][0]);
const float verticalAperture = (2.0 * focalLength) / _projectionMatrix[1][1];
_data.SetVerticalAperture(verticalAperture);
_data.SetVerticalApertureOffset(0.5 * verticalAperture * _projectionMatrix[2][1]);
_data.SetClippingRange(
GfRange1f(_projectionMatrix[3][2] / (_projectionMatrix[2][2] - 1.0),
_projectionMatrix[3][2] / (_projectionMatrix[2][2] + 1.0)));
}
else {
_data.SetProjection(GfCamera::Orthographic);
const float horizontalAperture = (2.0 / GfCamera::APERTURE_UNIT) / _projectionMatrix[0][0];
_data.SetHorizontalAperture(horizontalAperture);
_data.SetHorizontalApertureOffset(-0.5 * horizontalAperture * _projectionMatrix[3][0]);
const float verticalAperture = (2.0 / GfCamera::APERTURE_UNIT) / _projectionMatrix[1][1];
_data.SetVerticalAperture(verticalAperture);
_data.SetVerticalApertureOffset(-0.5 * verticalAperture * _projectionMatrix[3][1]);
const double nearMinusFarHalf = 1.0 / _projectionMatrix[2][2];
const double nearPlusFarHalf = nearMinusFarHalf * _projectionMatrix[3][2];
_data.SetClippingRange(
GfRange1f(nearPlusFarHalf + nearMinusFarHalf, nearPlusFarHalf - nearMinusFarHalf));
}
#endif
}
}
if (*dirtyBits & DirtyBits::DirtyWindowPolicy) {
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->windowPolicy);
if (!value.IsEmpty()) {
_windowPolicy = value.Get<CameraUtilConformWindowPolicy>();
}
}
if (*dirtyBits & DirtyBits::DirtyClipPlanes) {
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->clipPlanes);
if (!value.IsEmpty()) {
_clipPlanes = value.Get<std::vector<GfVec4d>>();
}
}
if (*dirtyBits & DirtyBits::DirtyParams) {
#if PXR_VERSION >= 2102
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->projection);
if (!value.IsEmpty()) {
_projection = value.Get<Projection>();
_data.SetProjection(_projection != Orthographic ? GfCamera::Perspective :
GfCamera::Orthographic);
}
#else
value = sceneDelegate->GetCameraParamValue(id, UsdGeomTokens->projection);
if (!value.IsEmpty()) {
_data.SetProjection(value.Get<TfToken>() != UsdGeomTokens->orthographic ?
GfCamera::Perspective :
GfCamera::Orthographic);
}
#endif
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->horizontalAperture);
if (!value.IsEmpty()) {
const auto horizontalAperture = value.Get<float>();
#if PXR_VERSION >= 2102
_horizontalAperture = horizontalAperture;
#endif
_data.SetHorizontalAperture(horizontalAperture / GfCamera::APERTURE_UNIT);
}
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->verticalAperture);
if (!value.IsEmpty()) {
const auto verticalAperture = value.Get<float>();
#if PXR_VERSION >= 2102
_verticalAperture = verticalAperture;
#endif
_data.SetVerticalAperture(verticalAperture / GfCamera::APERTURE_UNIT);
}
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->horizontalApertureOffset);
if (!value.IsEmpty()) {
const auto horizontalApertureOffset = value.Get<float>();
#if PXR_VERSION >= 2102
_horizontalApertureOffset = horizontalApertureOffset;
#endif
_data.SetHorizontalApertureOffset(horizontalApertureOffset / GfCamera::APERTURE_UNIT);
}
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->verticalApertureOffset);
if (!value.IsEmpty()) {
const auto verticalApertureOffset = value.Get<float>();
#if PXR_VERSION >= 2102
_verticalApertureOffset = verticalApertureOffset;
#endif
_data.SetVerticalApertureOffset(verticalApertureOffset / GfCamera::APERTURE_UNIT);
}
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->focalLength);
if (!value.IsEmpty()) {
const auto focalLength = value.Get<float>();
#if PXR_VERSION >= 2102
_focalLength = focalLength;
#endif
_data.SetFocalLength(focalLength / GfCamera::FOCAL_LENGTH_UNIT);
}
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->clippingRange);
if (!value.IsEmpty()) {
const auto clippingRange = value.Get<GfRange1f>();
#if PXR_VERSION >= 2102
_clippingRange = clippingRange;
#endif
_data.SetClippingRange(clippingRange);
}
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->fStop);
if (!value.IsEmpty()) {
const auto fStop = value.Get<float>();
#if PXR_VERSION >= 2102
_fStop = fStop;
#endif
_data.SetFStop(fStop);
}
value = sceneDelegate->GetCameraParamValue(id, HdCameraTokens->focusDistance);
if (!value.IsEmpty()) {
const auto focusDistance = value.Get<float>();
#if PXR_VERSION >= 2102
_focusDistance = focusDistance;
#endif
_data.SetFocusDistance(focusDistance);
}
}
*dirtyBits = DirtyBits::Clean;
}
void HdCyclesCamera::Finalize(HdRenderParam *renderParam)
{
HdCamera::Finalize(renderParam);
}
void HdCyclesCamera::ApplyCameraSettings(Camera *cam) const
{
ApplyCameraSettings(_data, _windowPolicy, cam);
array<Transform> motion(_transformSamples.count);
for (size_t i = 0; i < _transformSamples.count; ++i)
motion[i] = convert_transform(_transformSamples.values[i]) *
transform_scale(1.0f, 1.0f, -1.0f);
cam->set_motion(motion);
}
void HdCyclesCamera::ApplyCameraSettings(const GfCamera &dataUnconformedWindow,
CameraUtilConformWindowPolicy windowPolicy,
Camera *cam)
{
const float width = cam->get_full_width();
const float height = cam->get_full_height();
auto data = dataUnconformedWindow;
CameraUtilConformWindow(&data, windowPolicy, width / height);
static_assert(GfCamera::Perspective == CAMERA_PERSPECTIVE &&
GfCamera::Orthographic == CAMERA_ORTHOGRAPHIC);
cam->set_camera_type(static_cast<CameraType>(data.GetProjection()));
auto viewplane = data.GetFrustum().GetWindow();
auto focalLength = 1.0f;
if (data.GetProjection() == GfCamera::Perspective) {
viewplane *= 2.0 / viewplane.GetSize()[1]; // Normalize viewplane
focalLength = data.GetFocalLength() * 1e-3f;
cam->set_fov(GfDegreesToRadians(data.GetFieldOfView(GfCamera::FOVVertical)));
}
cam->set_sensorwidth(data.GetHorizontalAperture() * GfCamera::APERTURE_UNIT);
cam->set_sensorheight(data.GetVerticalAperture() * GfCamera::APERTURE_UNIT);
cam->set_nearclip(data.GetClippingRange().GetMin());
cam->set_farclip(data.GetClippingRange().GetMax());
cam->set_viewplane_left(viewplane.GetMin()[0]);
cam->set_viewplane_right(viewplane.GetMax()[0]);
cam->set_viewplane_bottom(viewplane.GetMin()[1]);
cam->set_viewplane_top(viewplane.GetMax()[1]);
if (data.GetFStop() != 0.0f) {
cam->set_focaldistance(data.GetFocusDistance());
cam->set_aperturesize(focalLength / (2.0f * data.GetFStop()));
}
cam->set_matrix(convert_transform(data.GetTransform()) * transform_scale(1.0f, 1.0f, -1.0f));
}
void HdCyclesCamera::ApplyCameraSettings(const GfMatrix4d &worldToViewMatrix,
const GfMatrix4d &projectionMatrix,
const std::vector<GfVec4d> &clipPlanes,
Camera *cam)
{
#if PXR_VERSION >= 2102
GfCamera data;
data.SetFromViewAndProjectionMatrix(worldToViewMatrix, projectionMatrix);
ApplyCameraSettings(data, CameraUtilFit, cam);
#else
TF_CODING_ERROR("Not implemented");
#endif
}
HDCYCLES_NAMESPACE_CLOSE_SCOPE
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