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/*=========================================================================
Program: Visualization Toolkit
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkOpenXRCamera.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLError.h"
#include "vtkOpenGLState.h"
#include "vtkOpenXR.h"
#include "vtkOpenXRRenderWindow.h"
#include "vtkPerspectiveTransform.h"
#include "vtkRenderer.h"
#include "vtkTimerLog.h"
#include "vtkTransform.h"
#include "vtkMatrix3x3.h"
#include "vtkQuaternion.h"
#include "vtkMath.h"
#include "vtkOpenXRManager.h"
#include <cassert>
#include <cmath>
#include "vtkOpenXRUtilities.h"
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkOpenXRCamera);
vtkOpenXRCamera::vtkOpenXRCamera() = default;
vtkOpenXRCamera::~vtkOpenXRCamera() = default;
//------------------------------------------------------------------------------
void vtkOpenXRCamera::UpdateWorldToEyeMatrices(vtkRenderer* ren)
{
vtkOpenXRRenderWindow* win = vtkOpenXRRenderWindow::SafeDownCast(ren->GetRenderWindow());
// Get physical to world matrix, which we then invert as we are trying to
// compute the world to view matrix which we do as
// viewCoord = physicalToEye * worldToPhysical * worldCoord
win->GetPhysicalToWorldMatrix(this->WorldToPhysicalMatrix);
this->WorldToPhysicalMatrix->Invert();
// at this point it is now correctly worldToPhysical
const XrPosef* xrPose = vtkOpenXRManager::GetInstance().GetViewPose(LEFT_EYE);
if (xrPose == nullptr)
{
vtkErrorMacro(<< "No pose for left eye, cannot update view transform");
return;
}
// Convert a XrPosef to a vtk view matrix
vtkOpenXRUtilities::SetMatrixFromXrPose(this->PhysicalToLeftEyeMatrix, *xrPose);
this->PhysicalToLeftEyeMatrix->Invert();
vtkMatrix4x4::Multiply4x4(
this->PhysicalToLeftEyeMatrix, this->WorldToPhysicalMatrix, this->WorldToLeftEyeMatrix);
xrPose = vtkOpenXRManager::GetInstance().GetViewPose(RIGHT_EYE);
if (xrPose == nullptr)
{
vtkErrorMacro(<< "No pose for right eye, cannot update view transform");
return;
}
// Convert a XrPosef to a vtk view matrix
vtkOpenXRUtilities::SetMatrixFromXrPose(this->PhysicalToRightEyeMatrix, *xrPose);
this->PhysicalToRightEyeMatrix->Invert();
vtkMatrix4x4::Multiply4x4(
this->PhysicalToRightEyeMatrix, this->WorldToPhysicalMatrix, this->WorldToRightEyeMatrix);
}
//------------------------------------------------------------------------------
void vtkOpenXRCamera::UpdateEyeToProjectionMatrices(vtkRenderer* ren)
{
vtkVRRenderWindow* win = vtkVRRenderWindow::SafeDownCast(ren->GetRenderWindow());
double scale = win->GetPhysicalScale();
double znear = this->ClippingRange[0] / scale;
double zfar = this->ClippingRange[1] / scale;
XrFovf const* xrFov = vtkOpenXRManager::GetInstance().GetProjectionFov(LEFT_EYE);
if (xrFov == nullptr)
{
vtkErrorMacro(<< "No fov for left eye, cannot update projection matrix");
return;
}
vtkOpenXRUtilities::CreateProjectionFov(this->LeftEyeToProjectionMatrix, *xrFov, znear, zfar);
xrFov = vtkOpenXRManager::GetInstance().GetProjectionFov(RIGHT_EYE);
if (xrFov == nullptr)
{
vtkErrorMacro(<< "No fov for right eye, cannot update projection matrix");
return;
}
vtkOpenXRUtilities::CreateProjectionFov(this->RightEyeToProjectionMatrix, *xrFov, znear, zfar);
}
//------------------------------------------------------------------------------
void vtkOpenXRCamera::Render(vtkRenderer* ren)
{
vtkOpenGLClearErrorMacro();
vtkOpenXRRenderWindow* win = vtkOpenXRRenderWindow::SafeDownCast(ren->GetRenderWindow());
vtkOpenGLState* ostate = win->GetState();
int renSize[2];
win->GetRenderBufferSize(renSize[0], renSize[1]);
// if were on a stereo renderer draw to special parts of screen
if (this->LeftEye)
{
// Left Eye
if (win->GetMultiSamples() && !ren->GetSelector())
{
ostate->vtkglEnable(GL_MULTISAMPLE);
}
}
else
{
// right eye
if (win->GetMultiSamples() && !ren->GetSelector())
{
ostate->vtkglEnable(GL_MULTISAMPLE);
}
}
ostate->vtkglViewport(0, 0, renSize[0], renSize[1]);
ostate->vtkglScissor(0, 0, renSize[0], renSize[1]);
if ((ren->GetRenderWindow())->GetErase() && ren->GetErase())
{
ren->Clear();
}
vtkOpenGLCheckErrorMacro("failed after Render");
}
VTK_ABI_NAMESPACE_END
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