Need help on migrationg part of code from Windows to Linux

[juanito]

Hi all,
I have to start working on a code that contains some fragments of OpenGL and which compiles without problems on Windows.
The problem is that I need to compile this code on Linux. The last time I used OpenGL was more than 10 years ago, so I'm not sure what changes I have to do in order to have it running on this system.
The following is the relevant part of the code


OGLDisplayWidget.h

#ifndef __OGLDisplayWidget_H
#define __OGLDisplayWidget_H
 
#define GL_GLEXT_PROTOTYPES
 
#include <QtGui/QtGui>
#include <QtGui/QMainWindow>
 
#if defined(WIN32) || defined(WIN64)
   #include <QGLWidget>
#else //linux
   #include <QtOpenGL/QGLWidget>
   #include </home/Qt/4.8.1/gcc/include/QtOpenGL/QGLPixelBuffer>
#endif
 
class nc_demonstrator;
class ImageAcquisition;
 
#define BUFFER_OFFSET(bytes) ((GLubyte*) NULL + (bytes))
 
 
class OGLDisplayWidget : public QGLWidget, protected Ui_ImageDisplay 
{
    Q_OBJECT
 
public:
 
   OGLDisplayWidget(QWidget *parent = NULL, QWidget *demo = NULL);
	~OGLDisplayWidget();
 
	//Revoir son utilite car plusieurs parametres semblent deja passe
	nc_demonstrator *NcDemonstrator;
	ImageAcquisition *test;
 
 
	NcImage* CreateStaticImage(NcImage *MyVunuImage, int width, int height);
	void FreeStaticImage(NcImage* MyVunuImage);
	void ClearImage() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); }
 
	DeviceImage ImageToDisplay;
	float ZoomXScale, ZoomYScale, ZoomXRefPoint, ZoomYRefPoint; 
	int GotImage;
 
	QReadWriteLock DisplayLock;
 
	QColor colorTable[256];
	unsigned int *lut;
	unsigned int *ColoredImage;
	int ColorEnable;
	int ColorStatusChanged;
 
	void ColorPalette();
 
	void ImageOnDisplay(DeviceImage ImageObject) {DisplayLock.lockForWrite(); ImageToDisplay = ImageObject; DisplayLock.unlock();}
 
	void UpdateHisto();
 
protected:
	void initializeGL();
	void paintGL();
	void leaveEvent(QEvent *event){ emit LeaveWidget(); }
        void mouseMoveEvent(QMouseEvent *mouseEvent);
 
private:
    	int elapsed;
	QGLPixelBuffer	*AltOnBoardBuffer;
	unsigned short *VunuMap;
	unsigned int *VunuMapColor;
	QImage *ImageReceived;
	GLuint textureId;   
	GLuint pboId;
};
 
 
#endif

OGLDisplayWidget.cpp

#include "OGLDisplayWidget.h"
 
#include<ctime>
#include<time.h>
 
#ifdef WIN32
	#include <GL/gl.h>    
	#include "glext.h"  
	PFNGLGENBUFFERSPROC VunuglGenBuffers;
	PFNGLBINDBUFFERPROC VunuglBindBuffer;
	PFNGLDELETEBUFFERSPROC VunuglDeleteBuffers;  
	PFNGLBUFFERDATAPROC VunuglBufferData; 
#endif
 
void OGLDisplayWidget::initializeGL() 
{	
 
	#ifdef WIN32 // get the pointer to the GL functions
    		VunuglGenBuffers     = (PFNGLGENBUFFERSPROC)wglGetProcAddress("glGenBuffersARB");
    		VunuglBindBuffer      = (PFNGLBINDBUFFERPROC) wglGetProcAddress("glBindBuffer");  
    		VunuglDeleteBuffers  = (PFNGLDELETEBUFFERSPROC) wglGetProcAddress("glDeleteBuffers");
    		VunuglBufferData      = (PFNGLBUFFERDATAPROC) wglGetProcAddress("glBufferData");
	#endif
 
	QGLFormat glFmt; 
    	glFmt.setSwapInterval(1); // 1= vsync on  
    	QGLFormat::setDefaultFormat(glFmt);
 
[B]    	VunuglGenBuffers(1, &pboId);[/B]
 
    	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
}
 
 
void OGLDisplayWidget::animate()
{
 	DisplayLock.lockForRead(); 
[B]        VunuglBindBuffer( GL_PIXEL_UNPACK_BUFFER, pboId);[/B]
[B]        VunuglBufferData(GL_PIXEL_UNPACK_BUFFER, 2*NcDemonstrator->imageWidth*NcDemonstrator->imageHeight, (unsigned short*)ImageToDisplay.constData(), GL_STREAM_DRAW);[/B]
  	DisplayLock.unlock();
 
	if (GotImage == 1)
		updateGL();
}

When I compile the error messages I get are:
On void OGLDisplayWidget::initializeGL() (first black line)
#error: 'VunuglGenBuffers' was not declared in this scope#

On void OGLDisplayWidget::animate() (second and third black line)
#error: 'VunuglGenBuffers' was not declared in this scope#

Any suggestion on how to solve this issue will be much appreciated.
cheers
Juanito

[Dark Photon]

Look at your source code. You're defining these on WIN32 only, but then referencing them on both WIN32 and Linux.

[juanito]

As it is, this code works on WIN64

[mbentrup]

Win64 #defines the WIN32 macro, too, for backward compatibility.

[juanito]

Thanks. Removing the preprocessor directives

OGLDisplayWidget.cpp

#include "OGLDisplayWidget.h"
 
#include<ctime>
#include<time.h>
 
[B]//#ifdef WIN32[/B]
	#include <GL/gl.h>    
	#include "glext.h"  
	PFNGLGENBUFFERSPROC VunuglGenBuffers;
	PFNGLBINDBUFFERPROC VunuglBindBuffer;
	PFNGLDELETEBUFFERSPROC VunuglDeleteBuffers;  
	PFNGLBUFFERDATAPROC VunuglBufferData; 
[B]//#endif[/B]
 
void OGLDisplayWidget::initializeGL() 
{	
 
	[B]//#ifdef WIN32 // get the pointer to the GL functions[/B]
[B]    		VunuglGenBuffers     = (PFNGLGENBUFFERSPROC)wglGetProcAddress("glGenBuffersARB");[/B]
    		VunuglBindBuffer      = (PFNGLBINDBUFFERPROC) wglGetProcAddress("glBindBuffer");  
    		VunuglDeleteBuffers  = (PFNGLDELETEBUFFERSPROC) wglGetProcAddress("glDeleteBuffers");
    		VunuglBufferData      = (PFNGLBUFFERDATAPROC) wglGetProcAddress("glBufferData");
[B]	//#endif[/B]
 
	QGLFormat glFmt; 
    	glFmt.setSwapInterval(1); // 1= vsync on  
    	QGLFormat::setDefaultFormat(glFmt);
 
    	VunuglGenBuffers(1, &pboId);[/B]
 
    	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
}
 
 
void OGLDisplayWidget::animate()
{
 	DisplayLock.lockForRead(); 
        VunuglBindBuffer( GL_PIXEL_UNPACK_BUFFER, pboId);[/B]
        VunuglBufferData(GL_PIXEL_UNPACK_BUFFER, 2*NcDemonstrator->imageWidth*NcDemonstrator->imageHeight, (unsigned short*)ImageToDisplay.constData(), GL_STREAM_DRAW);[/B]
  	DisplayLock.unlock();
 
	if (GotImage == 1)
		updateGL();
}

I got an error message on line
VunuglGenBuffers = (PFNGLGENBUFFERSPROC)wglGetProcAddress("glGenBuffe rsARB"); that says error: 'wglGetProcAddress' was not declared in this scope

I tried replacing VunuglGenBuffers = (PFNGLGENBUFFERSPROC)wglGetProcAddress("glGenBuffe rsARB"); by VunuglGenBuffers = (PFNGLGENBUFFERSPROC)glxGetProcAddressARB("glGenBu ffersARB");.
Same error.

[GLpeon]

Is there a reason why you are doing it manually, and not using GLEW (or something like that) ? http://glew.sourceforge.net/