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/*=========================================================================
Program: Visualization Toolkit
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 vtkOpenGLIndexBufferObject_h
#define vtkOpenGLIndexBufferObject_h
#include "vtkRenderingOpenGL2Module.h" // for export macro
#include "vtkOpenGLBufferObject.h"
/**
* @brief OpenGL vertex buffer object
*
* OpenGL buffer object to store geometry and/or attribute data on the
* GPU.
*/
class VTKRENDERINGOPENGL2_EXPORT vtkOpenGLIndexBufferObject :
public vtkOpenGLBufferObject
{
public:
static vtkOpenGLIndexBufferObject *New();
vtkTypeMacro(vtkOpenGLIndexBufferObject, vtkOpenGLBufferObject);
void PrintSelf(ostream& os, vtkIndent indent);
// Sizes/offsets are all in bytes as OpenGL API expects them.
size_t IndexCount; // Number of indices in the VBO
// Description:
// used to create an IBO for triangle primatives
size_t CreateTriangleIndexBuffer(vtkCellArray *cells,
vtkPoints *points);
// Description:
// used to create an IBO for triangle primatives
static void AppendTriangleIndexBuffer(
std::vector<unsigned int> &indexArray,
vtkCellArray *cells,
vtkPoints *points,
vtkIdType vertexOffset);
// Description:
// create a IBO for wireframe polys/tris
size_t CreateTriangleLineIndexBuffer(vtkCellArray *cells);
// Description:
// used to create an IBO for line primatives
static void AppendLineIndexBuffer(
std::vector<unsigned int> &indexArray,
vtkCellArray *cells,
vtkIdType vertexOffset);
// Description:
// create a IBO for wireframe polys/tris
size_t CreateLineIndexBuffer(vtkCellArray *cells);
// Description:
// create a IBO for wireframe polys/tris
static void AppendTriangleLineIndexBuffer(
std::vector<unsigned int> &indexArray,
vtkCellArray *cells,
vtkIdType vertexOffset);
// Description:
// used to create an IBO for primatives as points
size_t CreatePointIndexBuffer(vtkCellArray *cells);
// Description:
// used to create an IBO for primatives as points
static void AppendPointIndexBuffer(
std::vector<unsigned int> &indexArray,
vtkCellArray *cells,
vtkIdType vertexOffset);
// Description:
// used to create an IBO for line strips and triangle strips
size_t CreateStripIndexBuffer(
vtkCellArray *cells, bool wireframeTriStrips);
static void AppendStripIndexBuffer(
std::vector<unsigned int> &indexArray,
vtkCellArray *cells,
vtkIdType vertexOffset, bool wireframeTriStrips);
// Description:
// special index buffer for polys wireframe with edge visibilityflags
static void AppendEdgeFlagIndexBuffer(
std::vector<unsigned int> &indexArray,
vtkCellArray *cells,
vtkIdType vertexOffset, vtkDataArray *edgeflags);
size_t CreateEdgeFlagIndexBuffer(
vtkCellArray *cells, vtkDataArray *edgeflags);
// Create supporting arays that are needed when rendering cell data
// Some VTK cells have to be broken into smaller cells for OpenGL
// When we have cell data we have to map cell attributes from the VTK
// cell number to the actual OpenGL cell
// The following code fills in
//
// cellCellMap which maps a openGL cell id to the VTK cell it came from
//
static void CreateCellSupportArrays(
vtkCellArray *[4],
std::vector<unsigned int> &cellCellMap,
int representation,
vtkPoints *points);
protected:
vtkOpenGLIndexBufferObject();
~vtkOpenGLIndexBufferObject();
private:
vtkOpenGLIndexBufferObject(const vtkOpenGLIndexBufferObject&) VTK_DELETE_FUNCTION;
void operator=(const vtkOpenGLIndexBufferObject&) VTK_DELETE_FUNCTION;
};
#endif
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