[fltk.opengl] opengl Video rendering

[jack3]

Hi,

I met a problem with GLWindow. My aim is to use GLWindow to rendering Video( a 
serial image). the problem is redraw looks doesn't work as I thought. it became 
very slow and noneupdated.

Basically, my way is inherit a class glCanvas from GLWindow and override the 
function of draw_overlay and draw.

then, I have a thread to continuely read image from network and call 
redraw_overlay.

Finally,draw_overlay should be called to refresh the image on the window.

But I just noticed that window refreshed only when window has focus and mouse 
event on them. And the performance looks really bad.

Can anyone give me a clue?

Thanks first.

==================my code ==================

#include <stdlib.h>
#include <assert.h>
#include "VTGLCanvas.h"
#include <fltk/gl.h>
#include <fltk/draw.h>
using namespace fltk;
VTGLCanvas::VTGLCanvas(int w,int h,const char *l)
:GlWindow(0,0,w,h,l)
{       //mode(mode()|fltk::RGB|fltk::NO_AUTO_SWAP|fltk::NO_ERASE_OVERLAY);
        m_nWidth=nWidth;
        m_nHeight=nHeight;
        m_nBitCount=nBitCount;
        m_pFrameData=new char[nFrameSize+1280+1024];
}
VTGLCanvas::~VTGLCanvas()
{
}


void VTGLCanvas::ThreadProcMain(void)
{
        while (!m_bWantToStop)
        {
                mySleep(30);
                ////////////////////
                {
                        CAVAutoLock lock(&m_CritSecList);
                        m_pFrameData=readfromnetwork();
                        redraw_overlay();
                }
        }
}

void VTGLCanvas::draw()
{
}
void VTGLCanvas::draw_overlay()
{
        // the valid() property may be used to avoid reinitializing your
        // GL transformation for each redraw:
        if (!valid())
        {
                valid(1);
                glLoadIdentity();
                glViewport(0,0,w(),h());
        }
//      glBegin();
        glClearColor(0,0,0,0);
        glClear(GL_COLOR_BUFFER_BIT);
        CAVAutoLock lock(&m_CritSecData);
        
glDrawPixels(m_nWidth,m_nHeight,GL_BGR_EXT,GL_UNSIGNED_BYTE,m_pFrameData);
        swap_buffers();
//      glEnd();
        /*
        
glTexSubImage2D(GL_TEXTURE_2D,0,0,0,m_nWidth,m_nHeight,GL_RGB,GL_UNSIGNED_BYTE,m_pFrameData);
        */


}

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