ENH: Add an OpenGL only transfer function item.

Libs/Widgets/ctkTransferFunctionNativeItem.cpp

@@ -0,0 +1,117 @@
+/*=========================================================================
+
+  Library:   CTK
+ 
+  Copyright (c) 2010  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.commontk.org/LICENSE
+
+  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 ctkPrivate<ctkTransferFunctionNativeItem>
+{
+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)
+{
+  CTK_INIT_PRIVATE(ctkTransferFunctionNativeItem);
+}
+
+//-----------------------------------------------------------------------------
+ctkTransferFunctionNativeItem::ctkTransferFunctionNativeItem(
+  ctkTransferFunction* transferFunction, QGraphicsItem* parentItem)
+  :ctkTransferFunctionItem(transferFunction, parentItem)
+{
+  CTK_INIT_PRIVATE(ctkTransferFunctionNativeItem);
+}
+
+//-----------------------------------------------------------------------------
+ctkTransferFunctionNativeItem::~ctkTransferFunctionNativeItem()
+{  
+}
+
+//-----------------------------------------------------------------------------
+void ctkTransferFunctionNativeItem::paint(
+  QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget)
+{
+  CTK_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();
+}

Libs/Widgets/ctkTransferFunctionNativeItem.h

@@ -0,0 +1,52 @@
+/*=========================================================================
+
+  Library:   CTK
+ 
+  Copyright (c) 2010  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.commontk.org/LICENSE
+
+  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.
+ 
+=========================================================================*/
+
+#ifndef __ctkTransferFunctionNativeItem_h
+#define __ctkTransferFunctionNativeItem_h
+
+/// Qt includes
+#include <QGraphicsObject>
+#include <QColor>
+
+/// CTK includes
+#include "CTKWidgetsExport.h"
+#include "ctkPimpl.h"
+#include "ctkTransferFunctionItem.h"
+
+class ctkTransferFunctionNativeItemPrivate;
+
+//-----------------------------------------------------------------------------
+class CTK_WIDGETS_EXPORT ctkTransferFunctionNativeItem: public ctkTransferFunctionItem
+{
+  Q_OBJECT
+
+public:
+  ctkTransferFunctionNativeItem(QGraphicsItem* parent = 0);
+  ctkTransferFunctionNativeItem(ctkTransferFunction* transferFunction, 
+                                QGraphicsItem* parent = 0);
+  virtual ~ctkTransferFunctionNativeItem();
+
+  virtual void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0);
+
+private:
+  CTK_DECLARE_PRIVATE(ctkTransferFunctionNativeItem);
+};
+
+#endif