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113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkTextureUnitManager.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 vtkTextureUnitManager
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* @brief allocate/free texture units.
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*
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*
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* vtkTextureUnitManager is a central place used by shaders to reserve a
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* texture unit ( Allocate() ) or release it ( Free() ).
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*
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* Don't create a vtkTextureUnitManager, query it from the
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* vtkOpenGLRenderWindow
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*
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* @sa
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* vtkOpenGLRenderWindow
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*/
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#ifndef vtkTextureUnitManager_h
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#define vtkTextureUnitManager_h
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#include "vtkRenderingOpenGLModule.h" // For export macro
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#include "vtkObject.h"
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class vtkOpenGLRenderWindow;
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class VTKRENDERINGOPENGL_EXPORT vtkTextureUnitManager : public vtkObject
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{
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public:
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vtkTypeMacro(vtkTextureUnitManager,vtkObject);
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void PrintSelf(ostream& os, vtkIndent indent);
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static vtkTextureUnitManager *New();
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//@{
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/**
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* Get/Set the context. This does not increase the reference count of the
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* context to avoid reference loops.
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* SetContext() may raise an error is the OpenGL context does not support the
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* required OpenGL extensions.
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*/
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void SetContext(vtkOpenGLRenderWindow *context);
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vtkGetObjectMacro(Context,vtkOpenGLRenderWindow);
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//@}
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/**
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* Number of texture units supported by the OpenGL context.
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*/
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int GetNumberOfTextureUnits();
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/**
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* Reserve a texture unit. It returns its number.
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* It returns -1 if the allocation failed (because there is no more
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* texture unit left).
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* \post valid_result: result==-1 || result>=0 && result<this->GetNumberOfTextureUnits())
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* \post allocated: result==-1 || this->IsAllocated(result)
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*/
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virtual int Allocate();
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/**
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* Tell if texture unit `textureUnitId' is already allocated.
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* \pre valid_textureUnitId_range : textureUnitId>=0 && textureUnitId<this->GetNumberOfTextureUnits()
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*/
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bool IsAllocated(int textureUnitId);
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/**
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* Release a texture unit.
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* \pre valid_textureUnitId: textureUnitId>=0 && textureUnitId<this->GetNumberOfTextureUnits()
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* \pre allocated_textureUnitId: this->IsAllocated(textureUnitId)
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*/
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virtual void Free(int textureUnitId);
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protected:
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/**
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* Default constructor.
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*/
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vtkTextureUnitManager();
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/**
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* Destructor.
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*/
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~vtkTextureUnitManager();
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/**
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* Delete the allocation table and check if it is not called before
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* all the texture units have been released.
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*/
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void DeleteTable();
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vtkOpenGLRenderWindow *Context;
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int NumberOfTextureUnits;
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bool *TextureUnits;
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private:
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vtkTextureUnitManager(const vtkTextureUnitManager&) VTK_DELETE_FUNCTION;
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void operator=(const vtkTextureUnitManager&) VTK_DELETE_FUNCTION;
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};
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#endif
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