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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 "vtkVRHMDCamera.h"
#include "vtkMatrix3x3.h"
#include "vtkMatrix4x4.h"
#include "vtkOpenGLError.h"
#include "vtkOpenGLState.h"
#include "vtkRenderer.h"
#include "vtkTransform.h"
#include "vtkVRRenderWindow.h"
#include <cmath>
//------------------------------------------------------------------------------
VTK_ABI_NAMESPACE_BEGIN
vtkVRHMDCamera::vtkVRHMDCamera()
{
// approximate for Vive
// we use the projection matrix directly from the vive
// so this is just to help make view <--> display
// adjustments reasonable, not correct, just reasonable
this->SetViewAngle(110.0);
}
vtkVRHMDCamera::~vtkVRHMDCamera() = default;
// a reminder, with vtk order matrices multiplcation goes right to left
// e.g. vtkMatrix4x4::Multiply(BtoC, AtoB, AtoC);
//------------------------------------------------------------------------------
void vtkVRHMDCamera::Render(vtkRenderer* ren)
{
vtkOpenGLClearErrorMacro();
vtkVRRenderWindow* win = vtkVRRenderWindow::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 (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");
}
//------------------------------------------------------------------------------
void vtkVRHMDCamera::GetKeyMatrices(vtkRenderer* ren, vtkMatrix4x4*& wcvc, vtkMatrix3x3*& normMat,
vtkMatrix4x4*& vcdc, vtkMatrix4x4*& wcdc)
{
if (ren->GetSelector())
{
return this->Superclass::GetKeyMatrices(ren, wcvc, normMat, vcdc, wcdc);
}
// has the camera changed?
if (ren != this->LastRenderer || this->MTime > this->KeyMatrixTime ||
ren->GetMTime() > this->KeyMatrixTime)
{
vtkVRRenderWindow* win = vtkVRRenderWindow::SafeDownCast(ren->GetRenderWindow());
// on left eye render we compute the NormalMatrix, this should be fairly
// accurate for both eyes.
if (this->LeftEye)
{
this->UpdateWorldToEyeMatrices(ren);
this->UpdateEyeToProjectionMatrices(ren);
vtkMatrix4x4* w2v = this->GetModelViewTransformMatrix();
this->WCVCMatrix->DeepCopy(w2v);
// only compute normal matrix once
for (int i = 0; i < 3; ++i)
{
for (int j = 0; j < 3; ++j)
{
this->NormalMatrix->SetElement(i, j, w2v->GetElement(i, j));
}
}
this->NormalMatrix->Invert();
}
if (this->LeftEye)
{
this->SetCameraFromWorldToDeviceMatrix(this->WorldToLeftEyeMatrix, win->GetPhysicalScale());
this->ModelViewTransform->SetMatrix(this->WorldToLeftEyeMatrix);
this->WCVCMatrix->DeepCopy(this->WorldToLeftEyeMatrix);
this->WCVCMatrix->Transpose();
vtkMatrix4x4::Multiply4x4(
this->LeftEyeToProjectionMatrix, this->WorldToLeftEyeMatrix, this->WCDCMatrix);
this->WCDCMatrix->Transpose();
vtkMatrix4x4::Multiply4x4(this->LeftEyeToProjectionMatrix, this->PhysicalToLeftEyeMatrix,
this->PhysicalToProjectionMatrixForLeftEye);
this->VCDCMatrix->DeepCopy(this->LeftEyeToProjectionMatrix);
this->VCDCMatrix->Transpose();
}
else
{
this->SetCameraFromWorldToDeviceMatrix(this->WorldToRightEyeMatrix, win->GetPhysicalScale());
this->ModelViewTransform->SetMatrix(this->WorldToRightEyeMatrix);
this->WCVCMatrix->DeepCopy(this->WorldToRightEyeMatrix);
this->WCVCMatrix->Transpose();
vtkMatrix4x4::Multiply4x4(
this->RightEyeToProjectionMatrix, this->WorldToRightEyeMatrix, this->WCDCMatrix);
this->WCDCMatrix->Transpose();
vtkMatrix4x4::Multiply4x4(this->RightEyeToProjectionMatrix, this->PhysicalToRightEyeMatrix,
this->PhysicalToProjectionMatrixForRightEye);
this->VCDCMatrix->DeepCopy(this->RightEyeToProjectionMatrix);
this->VCDCMatrix->Transpose();
}
this->KeyMatrixTime.Modified();
this->LastRenderer = ren;
}
wcdc = this->WCDCMatrix;
wcvc = this->WCVCMatrix;
normMat = this->NormalMatrix;
vcdc = this->VCDCMatrix;
}
//------------------------------------------------------------------------------
void vtkVRHMDCamera::GetPhysicalToProjectionMatrix(vtkMatrix4x4*& physToProjectionMat)
{
if (this->LeftEye)
{
physToProjectionMat = this->PhysicalToProjectionMatrixForLeftEye;
}
else
{
physToProjectionMat = this->PhysicalToProjectionMatrixForRightEye;
}
}
//------------------------------------------------------------------------------
void vtkVRHMDCamera::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "PhysicalToLeftEyeMatrix: ";
this->PhysicalToLeftEyeMatrix->PrintSelf(os, indent);
os << indent << "PhysicalToRightEyeMatrix: ";
this->PhysicalToRightEyeMatrix->PrintSelf(os, indent);
os << indent << "WorldToLeftEyeMatrix: ";
this->WorldToLeftEyeMatrix->PrintSelf(os, indent);
os << indent << "WorldToRightEyeMatrix: ";
this->WorldToRightEyeMatrix->PrintSelf(os, indent);
os << indent << "LeftEyeToProjectionMatrix: ";
this->LeftEyeToProjectionMatrix->PrintSelf(os, indent);
os << indent << "RightEyeToProjectionMatrix: ";
this->RightEyeToProjectionMatrix->PrintSelf(os, indent);
os << indent << "PhysicalToProjectionMatrixForLeftEye: ";
this->PhysicalToProjectionMatrixForLeftEye->PrintSelf(os, indent);
os << indent << "PhysicalToProjectionMatrixForRightEye: ";
this->PhysicalToProjectionMatrixForRightEye->PrintSelf(os, indent);
}
VTK_ABI_NAMESPACE_END
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