mirror of https://gitee.com/openkylin/vtk9.git
107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkOpenGLContextBufferId.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkOpenGLContextBufferId
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* @brief 2D array of ids stored in VRAM.
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*
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*
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* An 2D array where each element is the id of an entity drawn at the given
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* pixel.
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*/
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#ifndef vtkOpenGLContextBufferId_h
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#define vtkOpenGLContextBufferId_h
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#include "vtkAbstractContextBufferId.h"
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#include "vtkRenderingContextOpenGL2Module.h" // For export macro
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class vtkTextureObject;
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class vtkOpenGLRenderWindow;
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class VTKRENDERINGCONTEXTOPENGL2_EXPORT vtkOpenGLContextBufferId : public vtkAbstractContextBufferId
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{
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public:
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vtkTypeMacro(vtkOpenGLContextBufferId, vtkAbstractContextBufferId);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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/**
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* Creates a 2D Painter object.
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*/
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static vtkOpenGLContextBufferId* New();
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/**
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* Release any graphics resources that are being consumed by this object.
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*/
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void ReleaseGraphicsResources() override;
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///@{
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/**
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* Set/Get the OpenGL context owning the texture object resource.
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*/
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void SetContext(vtkRenderWindow* context) override;
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vtkRenderWindow* GetContext() override;
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///@}
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/**
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* Returns if the context supports the required extensions.
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* \pre context_is_set: this->GetContext()!=0
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*/
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bool IsSupported() override;
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/**
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* Allocate the memory for at least Width*Height elements.
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* \pre positive_width: GetWidth()>0
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* \pre positive_height: GetHeight()>0
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* \pre context_is_set: this->GetContext()!=0
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*/
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void Allocate() override;
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/**
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* Tell if the buffer has been allocated.
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*/
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bool IsAllocated() const override;
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/**
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* Copy the contents of the current read buffer to the internal texture
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* starting at lower left corner of the framebuffer (srcXmin,srcYmin).
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* \pre is_allocated: this->IsAllocated()
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*/
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void SetValues(int srcXmin, int srcYmin) override;
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/**
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* Return item under abscissa x and ordinate y.
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* Abscissa go from left to right.
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* Ordinate go from bottom to top.
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* The return value is -1 if there is no item.
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* \pre is_allocated: IsAllocated()
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* \post valid_result: result>=-1
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*/
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vtkIdType GetPickedItem(int x, int y) override;
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protected:
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vtkOpenGLContextBufferId();
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~vtkOpenGLContextBufferId() override;
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vtkOpenGLRenderWindow* Context;
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vtkTextureObject* Texture;
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private:
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vtkOpenGLContextBufferId(const vtkOpenGLContextBufferId&) = delete;
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void operator=(const vtkOpenGLContextBufferId&) = delete;
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};
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#endif // #ifndef vtkOpenGLContextBufferId_h
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