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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.
=========================================================================*/
#include "vtkOpenGLBufferObject.h"
#include "vtkObjectFactory.h"
#include "vtk_glew.h"
vtkStandardNewMacro(vtkOpenGLBufferObject)
namespace {
inline GLenum convertType(vtkOpenGLBufferObject::ObjectType type)
{
switch (type)
{
case vtkOpenGLBufferObject::ElementArrayBuffer:
return GL_ELEMENT_ARRAY_BUFFER;
case vtkOpenGLBufferObject::TextureBuffer:
#if defined (GL_TEXTURE_BUFFER)
return GL_TEXTURE_BUFFER;
// intentional fall through when not defined
#endif
default:
case vtkOpenGLBufferObject::ArrayBuffer:
return GL_ARRAY_BUFFER;
}
}
}
struct vtkOpenGLBufferObject::Private
{
Private()
{
this->Handle = 0;
this->Type = GL_ARRAY_BUFFER;
}
GLenum Type;
GLuint Handle;
};
vtkOpenGLBufferObject::vtkOpenGLBufferObject()
{
this->Dirty = true;
this->Internal = new Private;
this->Internal->Type = convertType(vtkOpenGLBufferObject::ArrayBuffer);
}
vtkOpenGLBufferObject::~vtkOpenGLBufferObject()
{
if (this->Internal->Handle != 0)
{
glDeleteBuffers(1, &this->Internal->Handle);
}
delete this->Internal;
}
void vtkOpenGLBufferObject::ReleaseGraphicsResources()
{
if (this->Internal->Handle != 0)
{
glBindBuffer(this->Internal->Type, 0);
glDeleteBuffers(1, &this->Internal->Handle);
this->Internal->Handle = 0;
}
}
void vtkOpenGLBufferObject::SetType(vtkOpenGLBufferObject::ObjectType value)
{
this->Internal->Type = convertType(value);
}
vtkOpenGLBufferObject::ObjectType vtkOpenGLBufferObject::GetType() const
{
if (this->Internal->Type == GL_ARRAY_BUFFER)
{
return vtkOpenGLBufferObject::ArrayBuffer;
}
if (this->Internal->Type == GL_ELEMENT_ARRAY_BUFFER)
{
return vtkOpenGLBufferObject::ElementArrayBuffer;
}
else
{
return vtkOpenGLBufferObject::TextureBuffer;
}
}
int vtkOpenGLBufferObject::GetHandle() const
{
return static_cast<int>(this->Internal->Handle);
}
bool vtkOpenGLBufferObject::Bind()
{
if (!this->Internal->Handle)
{
return false;
}
glBindBuffer(this->Internal->Type, this->Internal->Handle);
return true;
}
bool vtkOpenGLBufferObject::Release()
{
if (!this->Internal->Handle)
{
return false;
}
glBindBuffer(this->Internal->Type, 0);
return true;
}
bool vtkOpenGLBufferObject::GenerateBuffer(
vtkOpenGLBufferObject::ObjectType objectType)
{
GLenum objectTypeGL = convertType(objectType);
if (this->Internal->Handle == 0)
{
glGenBuffers(1, &this->Internal->Handle);
this->Internal->Type = objectTypeGL;
}
return (this->Internal->Type == objectTypeGL);
}
bool vtkOpenGLBufferObject::UploadInternal(
const void *buffer, size_t size,
vtkOpenGLBufferObject::ObjectType objectType)
{
const bool generated = this->GenerateBuffer(objectType);
if (!generated)
{
this->Error = "Trying to upload array buffer to incompatible buffer.";
return false;
}
glBindBuffer(this->Internal->Type, this->Internal->Handle);
glBufferData(this->Internal->Type, size, static_cast<const GLvoid *>(buffer),
GL_STATIC_DRAW);
this->Dirty = false;
return true;
}
//-----------------------------------------------------------------------------
void vtkOpenGLBufferObject::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
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