vtkPixelBufferObject.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkPixelBufferObject.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.

=========================================================================*/
#ifndef vtkPixelBufferObject_h
#define vtkPixelBufferObject_h

#include "vtkObject.h"
#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkWeakPointer.h" // needed for vtkWeakPointer.

class vtkRenderWindow;
class vtkOpenGLExtensionManager;

class VTKRENDERINGOPENGL2_EXPORT vtkPixelBufferObject : public vtkObject
{
public:

  // Usage values.
  enum
  {
    StreamDraw=0,
    StreamRead,
    StreamCopy,
    StaticDraw,
    StaticRead,
    StaticCopy,
    DynamicDraw,
    DynamicRead,
    DynamicCopy,
    NumberOfUsages
  };

  static vtkPixelBufferObject* New();
  vtkTypeMacro(vtkPixelBufferObject, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;


  void SetContext(vtkRenderWindow* context);
  vtkRenderWindow* GetContext();


  vtkGetMacro(Usage,int);
  vtkSetMacro(Usage,int);


  bool Upload1D(int type, void* data,
    unsigned int numtuples, int comps, vtkIdType increment)
  {
    unsigned int newdims[3];
    newdims[0] = numtuples;
    newdims[1] = 1;
    newdims[2] = 1;
    vtkIdType newinc[3];
    newinc[0] = increment;
    newinc[1] = 0;
    newinc[2] = 0;
    return this->Upload3D(type, data, newdims, comps, newinc,0,nullptr);
  }


  bool Upload2D(int type, void* data,
    unsigned int dims[2],
    int comps,
    vtkIdType increments[2])
  {
    unsigned int newdims[3];
    newdims[0] = dims[0];
    newdims[1] = dims[1];
    newdims[2] = 1;
    vtkIdType newinc[3];
    newinc[0] = increments[0];
    newinc[1] = increments[1];
    newinc[2] = 0;
    return this->Upload3D(type, data, newdims, comps, newinc,0,nullptr);
  }

  bool Upload3D(int type, void* data,
                unsigned int dims[3], int comps,
                vtkIdType increments[3],
                int components,
                int *componentList);


  vtkGetMacro(Type, int);
  vtkSetMacro(Type, int);


  vtkGetMacro(Components, int);
  vtkSetMacro(Components, int);


  vtkGetMacro(Size, unsigned int);
  vtkSetMacro(Size, unsigned int);
  void SetSize(unsigned int nTups, int nComps);


  vtkGetMacro(Handle, unsigned int);


  bool Download1D(
    int type, void* data,
    unsigned int dim,
    int numcomps, vtkIdType increment)
  {
    unsigned int newdims[3];
    newdims[0] = dim;
    newdims[1] = 1;
    newdims[2] = 1;
    vtkIdType newincrements[3];
    newincrements[0] = increment;
    newincrements[1] = 0;
    newincrements[2] = 0;
    return this->Download3D(type, data, newdims, numcomps, newincrements);
  }


  bool Download2D(
    int type, void* data,
    unsigned int dims[2],
    int numcomps, vtkIdType increments[2])
  {
    unsigned int newdims[3];
    newdims[0] = dims[0];
    newdims[1] = dims[1];
    newdims[2] = 1;
    vtkIdType newincrements[3];
    newincrements[0] = increments[0];
    newincrements[1] = increments[1];
    newincrements[2] =  0;
    return this->Download3D(type, data, newdims, numcomps, newincrements);
  }

  bool Download3D(int type, void* data,
    unsigned int dims[3],
    int numcomps, vtkIdType increments[3]);

  void BindToPackedBuffer()
    { this->Bind(PACKED_BUFFER); }

  void BindToUnPackedBuffer()
    { this->Bind(UNPACKED_BUFFER); }

  void UnBind();

  void *MapPackedBuffer()
    { return this->MapBuffer(PACKED_BUFFER); }

  void *MapPackedBuffer(int type, unsigned int numtuples, int comps)
    { return this->MapBuffer(type, numtuples, comps, PACKED_BUFFER); }

  void *MapPackedBuffer(unsigned int numbytes)
    { return this->MapBuffer(numbytes, PACKED_BUFFER); }

  void *MapUnpackedBuffer()
    { return this->MapBuffer(UNPACKED_BUFFER); }

  void *MapUnpackedBuffer(int type, unsigned int numtuples, int comps)
    { return this->MapBuffer(type, numtuples, comps, UNPACKED_BUFFER); }

  void *MapUnpackedBuffer(unsigned int numbytes)
    { return this->MapBuffer(numbytes, UNPACKED_BUFFER); }

  void UnmapUnpackedBuffer()
    { this->UnmapBuffer(UNPACKED_BUFFER); }

  void UnmapPackedBuffer()
    { this->UnmapBuffer(PACKED_BUFFER); }

  // PACKED_BUFFER for download APP<-PBO
  // UNPACKED_BUFFER for upload APP->PBO
  enum BufferType{
    UNPACKED_BUFFER=0,
    PACKED_BUFFER
  };

  void Bind(BufferType buffer);


  void *MapBuffer(int type, unsigned int numtuples, int comps, BufferType mode);
  void *MapBuffer(unsigned int numbytes, BufferType mode);
  void *MapBuffer(BufferType mode);

  void UnmapBuffer(BufferType mode);

  void Allocate(
        int vtkType,
        unsigned int numtuples,
        int comps,
        BufferType mode);

  void Allocate(
        unsigned int nbytes,
        BufferType mode);

  void ReleaseMemory();

  static bool IsSupported(vtkRenderWindow* renWin);

protected:
  vtkPixelBufferObject();
  ~vtkPixelBufferObject() override;

  bool LoadRequiredExtensions(vtkRenderWindow* renWin);

  void CreateBuffer();

  void DestroyBuffer();

  int Usage;
  unsigned int BufferTarget; // GLenum
  int Type;
  int Components;
  unsigned int Size;
  vtkWeakPointer<vtkRenderWindow> Context;
  unsigned int Handle;
private:
  vtkPixelBufferObject(const vtkPixelBufferObject&) = delete;
  void operator=(const vtkPixelBufferObject&) = delete;
};

#endif