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/*=========================================================================
Program: Visualization Toolkit
Module: vtkTextureUnitManager.cxx
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 "vtkTextureUnitManager.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLRenderWindow.h"
#include "vtkOpenGLHardwareSupport.h"
#include <cassert>
vtkStandardNewMacro(vtkTextureUnitManager);
// ----------------------------------------------------------------------------
vtkTextureUnitManager::vtkTextureUnitManager()
{
this->Context=0;
this->NumberOfTextureUnits=0;
this->TextureUnits=0;
}
// ----------------------------------------------------------------------------
vtkTextureUnitManager::~vtkTextureUnitManager()
{
this->DeleteTable();
this->Context=0;
}
// ----------------------------------------------------------------------------
// Description:
// Delete the allocation table and check if it is not called before
// all the texture units have been released.
void vtkTextureUnitManager::DeleteTable()
{
if(this->TextureUnits!=0)
{
size_t i=0;
size_t c=this->NumberOfTextureUnits;
bool valid=true;
while(valid && i<c)
{
valid=!this->TextureUnits[i];
++i;
}
if(!valid)
{
vtkErrorMacro(<<"the texture unit is deleted but not some texture unit has not been released: Id="<<i);
}
delete[] this->TextureUnits;
this->TextureUnits=0;
this->NumberOfTextureUnits=0;
}
}
// ----------------------------------------------------------------------------
void vtkTextureUnitManager::SetContext(vtkOpenGLRenderWindow *context)
{
if(this->Context!=context)
{
if(this->Context!=0)
{
this->DeleteTable();
}
this->Context=context;
if(this->Context!=0)
{
vtkOpenGLHardwareSupport *info=context->GetHardwareSupport();
this->NumberOfTextureUnits=info->GetNumberOfTextureUnits();
if(this->NumberOfTextureUnits>0)
{
this->TextureUnits=new bool[this->NumberOfTextureUnits];
size_t i=0;
size_t c=this->NumberOfTextureUnits;
while(i<c)
{
this->TextureUnits[i]=false;
++i;
}
}
}
this->Modified();
}
}
// ----------------------------------------------------------------------------
// Description:
// Number of texture units supported by the OpenGL context.
int vtkTextureUnitManager::GetNumberOfTextureUnits()
{
return this->NumberOfTextureUnits;
}
// ----------------------------------------------------------------------------
// Description:
// Reserve a texture unit. It returns its number.
// It returns -1 if the allocation failed (because there is no more
// texture unit left).
// \post valid_result: result==-1 || result>=0 && result<this->GetNumberOfTextureUnits())
// \post allocated: result==-1 || this->IsAllocated(result)
int vtkTextureUnitManager::Allocate()
{
bool found=false;
size_t i=0;
size_t c=this->NumberOfTextureUnits;
while(!found && i<c)
{
found=!this->TextureUnits[i];
++i;
}
int result;
if(found)
{
result=static_cast<int>(i-1);
this->TextureUnits[result]=true;
}
else
{
result=-1;
}
assert("post: valid_result" && (result==-1 || (result>=0 && result<this->GetNumberOfTextureUnits())));
assert("post: allocated" && (result==-1 || this->IsAllocated(result)));
return result;
}
// ----------------------------------------------------------------------------
// Description:
// Tell if texture unit `textureUnitId' is already allocated.
// \pre valid_id_range : textureUnitId>=0 && textureUnitId<this->GetNumberOfTextureUnits()
bool vtkTextureUnitManager::IsAllocated(int textureUnitId)
{
assert("pre: valid_textureUnitId_range" && textureUnitId>=0 && textureUnitId<this->GetNumberOfTextureUnits());
return this->TextureUnits[textureUnitId];
}
// ----------------------------------------------------------------------------
// Description:
// Release a texture unit.
// \pre valid_id: textureUnitId>=0 && textureUnitId<this->GetNumberOfTextureUnits()
// \pre allocated_id: this->IsAllocated(textureUnitId)
void vtkTextureUnitManager::Free(int textureUnitId)
{
assert("pre: valid_textureUnitId" && (textureUnitId>=0 && textureUnitId<this->GetNumberOfTextureUnits()));
assert("pre: allocated_textureUnitId" && this->IsAllocated(textureUnitId));
this->TextureUnits[textureUnitId]=false;
}
// ----------------------------------------------------------------------------
void vtkTextureUnitManager::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Context: ";
if(this->Context!=0)
{
os << static_cast<void *>(this->Context) <<endl;
}
else
{
os << "none" << endl;
}
}
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