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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLMovieSphere.h
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.
=========================================================================*/
/**
* @class vtkOpenGLMovieSphere
* @brief OpenGL MovieSphere, an optimized VR sphere for movies
*
* This class is designed to more efficiently convert ffmpeg output to a
* movie sphere. The vtkSkybox will work, but it does an expensive
* conversion of the data from YUV to RGB, does an extra copy of the RGB
* data and the RGB data is twice as large when pushing to the GPU. This
* class also uses double buffering of textures to help prevent pipeline
* stalls. In a quick test between the two classes playing a 4K30p video
* sphere along with VR rendering, decoding etc just switching out the
* vtkSkybox for this class resulting in CPU usage going from 124 seconds
* down to 81 seconds. Likewise the frame timings in VR became noticeably
* better which could partially be due to pushing half as much data to the
* GPU. (YUV420 is half the size of RGB)
*/
#ifndef vtkOpenGLMovieSphere_h
#define vtkOpenGLMovieSphere_h
#include "vtkNew.h" // for ivars
#include "vtkOpenGLSkybox.h"
#include "vtkRenderingFFMPEGOpenGL2Module.h" // For export macro
#include "vtkSmartPointer.h" // for ivars
#include <atomic> // for ivars
#include <mutex> // for ivars
VTK_ABI_NAMESPACE_BEGIN
class vtkFFMPEGVideoSource;
struct vtkFFMPEGVideoSourceVideoCallbackData;
class vtkMutexLock;
class vtkOpenGLActor;
class vtkOpenGLPolyDataMapper;
class vtkTextureObject;
class VTKRENDERINGFFMPEGOPENGL2_EXPORT vtkOpenGLMovieSphere : public vtkOpenGLSkybox
{
public:
static vtkOpenGLMovieSphere* New();
vtkTypeMacro(vtkOpenGLMovieSphere, vtkOpenGLSkybox);
void PrintSelf(ostream& os, vtkIndent indent) override;
/**
* Actual MovieSphere render method.
*/
void Render(vtkRenderer* ren, vtkMapper* mapper) override;
void SetVideoSource(vtkFFMPEGVideoSource* val);
vtkFFMPEGVideoSource* GetVideoSource();
protected:
vtkOpenGLMovieSphere();
~vtkOpenGLMovieSphere() override;
void UpdateUniforms(vtkObject*, unsigned long, void*);
vtkNew<vtkTextureObject> Textures[6];
int BuildIndex;
int DrawIndex;
int YTexture;
int UTexture;
int VTexture;
void VideoCallback(vtkFFMPEGVideoSourceVideoCallbackData const& cbd);
std::mutex TextureUpdateMutex;
unsigned char* TextureData[6];
int ReadIndex; // access only within mutex
int WriteIndex;
std::atomic<int> NewData;
std::atomic<int> HaveData;
int Height;
int Width;
int UVHeight;
int UVWidth;
vtkSmartPointer<vtkFFMPEGVideoSource> VideoSource;
private:
vtkOpenGLMovieSphere(const vtkOpenGLMovieSphere&) = delete;
void operator=(const vtkOpenGLMovieSphere&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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