forked from commontk/CTK
/
ctkTransferFunctionNativeItem.cpp
118 lines (98 loc) · 3.86 KB
/
ctkTransferFunctionNativeItem.cpp
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/*=========================================================================
Library: CTK
Copyright (c) Kitware Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0.txt
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
=========================================================================*/
/// Qt includes
#include <QColor>
#include <QDebug>
#include <QPainter>
#include <QtGlobal>
#include <QVariant>
#include <QtOpenGL>
/// CTK includes
#include "ctkTransferFunction.h"
#include "ctkTransferFunctionNativeItem.h"
#include "ctkTransferFunctionScene.h"
#include <windows.h>
#include <gl\gl.h> // Header File For The OpenGL32 Library
#include <gl\glu.h> // Header File For The GLu32 Library
//----------------------------------------------------------------------------
class ctkTransferFunctionNativeItemPrivate
{
public:
ctkTransferFunctionNativeItemPrivate();
virtual ~ctkTransferFunctionNativeItemPrivate();
void initTexture();
GLuint Texture[1];
};
//----------------------------------------------------------------------------
ctkTransferFunctionNativeItemPrivate::ctkTransferFunctionNativeItemPrivate()
{
this->Texture[0] = GL_INVALID_VALUE;
}
//----------------------------------------------------------------------------
void ctkTransferFunctionNativeItemPrivate::initTexture()
{
glGenTextures(1, &this->Texture[0]);
glBindTexture(GL_TEXTURE_2D, this->Texture[0]);
if (!glIsTexture(this->Texture[0]))
{
qDebug() << "pb texture";
}
float transferFunction[12] = {0.,0.,0.,1.,0.,0.,0.,1.,0.,0.,0.,1.};
glTexImage2D(GL_TEXTURE_2D, 0, 3, 4, 1, 0, GL_RGB, GL_FLOAT, transferFunction);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
}
//-----------------------------------------------------------------------------
ctkTransferFunctionNativeItemPrivate::~ctkTransferFunctionNativeItemPrivate()
{
glDeleteTextures(1, &this->Texture[0]);
}
//-----------------------------------------------------------------------------
ctkTransferFunctionNativeItem::ctkTransferFunctionNativeItem(QGraphicsItem* parentGraphicsItem)
:ctkTransferFunctionItem(parentGraphicsItem), d_ptr(new ctkTransferFunctionNativeItemPrivate)
{
}
//-----------------------------------------------------------------------------
ctkTransferFunctionNativeItem::ctkTransferFunctionNativeItem(
ctkTransferFunction* transferFunction, QGraphicsItem* parentItem)
:ctkTransferFunctionItem(transferFunction, parentItem),
d_ptr(new ctkTransferFunctionNativeItemPrivate)
{
}
//-----------------------------------------------------------------------------
ctkTransferFunctionNativeItem::~ctkTransferFunctionNativeItem()
{
}
//-----------------------------------------------------------------------------
void ctkTransferFunctionNativeItem::paint(
QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget)
{
Q_D(ctkTransferFunctionNativeItem);
painter->beginNativePainting();
if (d->Texture[0] == GL_INVALID_VALUE)
{
d->initTexture();
}
glEnable(GL_TEXTURE_2D);
//glDisable(GL_DEPTH_TEST);
//glDepthFunc(GL_LEQUAL);
glBindTexture(GL_TEXTURE_2D, d->Texture[0]);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f(0.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex2f(0.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex2f(1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex2f(1.0f, 0.0f);
glEnd();
painter->endNativePainting();
}