//
// C++ Implementation: k9glwidget
//
// Description:
//
//
// Author: Jean-Michel PETIT <k9copy@free.fr>, (C) 2006
//
// Copyright: See COPYING file that comes with this distribution
//
//

#include "k9glwidget.h"

#ifdef HAVE_OPENGL
#include <qsize.h>
#include <qapplication.h>
#include <qdatetime.h>
#include "ac.h"
#include <X11/Xlib.h>

k9GLWidget::k9GLWidget(QWidget *parent, const char *name):QGLWidget(parent, name) {
    XMapRaised(x11Display(),winId());

    m_buffer=NULL;
    m_height=0;
    m_width=0;
    library=new QLibrary("GL");

    glClear = (glClear_t) library->resolve( "glClear" );
    glRasterPos2i= (glRasterPos2i_t)library->resolve("glRasterPos2i");
    glFlush = (glFlush_t)library->resolve("glFlush");
    glClearColor =(glClearColor_t)library->resolve("glClearColor");
    glShadeModel =(glShadeModel_t)library->resolve("glShadeModel");
    glPixelStorei =(glPixelStorei_t)library->resolve("glPixelStorei");
    glViewport =(glViewport_t)library->resolve("glViewport");
    glMatrixMode =(glMatrixMode_t)library->resolve("glMatrixMode");
    glLoadIdentity =(glLoadIdentity_t)library->resolve("glLoadIdentity");
    glOrtho =(glOrtho_t)library->resolve("glOrtho");
    glPixelZoom=(glPixelZoom_t)library->resolve("glPixelZoom");
    glDrawPixels=(glDrawPixels_t)library->resolve("glDrawPixels");
    glDisable=(glDisable_t)library->resolve("glDisable");
    glPixelTransferi=(glPixelTransferi_t)library->resolve("glPixelTransferi");
    glGetString=(glGetString_t)library->resolve("glGetString");
}

k9GLWidget* k9GLWidget::createWidget(QWidget *parent , const char *name ) {
    //XInitThreads();
    return new k9GLWidget(parent,name);
}

k9GLWidget::~k9GLWidget() {
    if (m_buffer !=NULL)
        free(m_buffer);
    delete library;
}

void k9GLWidget::paintGL() {
   draw();
}

void k9GLWidget::setImage(uchar *_buffer,int _width,int _height,int _len) {
     if (qApp==NULL)
	return;
     if (qApp->tryLock() ) {
	uchar *buffer=_buffer;
	m_width=_width;
	m_height=_height;
	m_mutex.lock();
        if (m_buffer !=NULL)
           free(m_buffer);
        m_buffer=buffer;		
	//m_stack.push(buffer);
	m_mutex.unlock();
	update();
	if (qApp !=NULL)
            qApp->unlock();
    } else {
	free(_buffer);
    }
}

void k9GLWidget::draw() {
    XLockDisplay(x11Display());
  //  uchar *buffer=NULL;
    if (m_mutex.tryLock()) {
     /*   if (!m_stack.isEmpty())
            buffer=m_stack.pop();
        if (buffer !=NULL) {
            if (m_buffer !=NULL)
                free(m_buffer);
            m_buffer=buffer;
        }
*/
        if (m_buffer!=NULL) {
	    int h=height()-2;
	    int w=width()-2;
            GLfloat wratio=(GLfloat)w/(GLfloat)m_width;
            GLfloat hratio=(GLfloat)h/(GLfloat)m_height;
            GLfloat ratio= wratio < hratio ? wratio:hratio;


            //    glClear(GL_COLOR_BUFFER_BIT);
            int top = h-(int) (h -m_height*ratio) /2;
            int left = (int) (w -m_width*ratio) /2;

            glRasterPos2i (left,top);
            glPixelZoom (ratio, -ratio);

            glDrawPixels( m_width, m_height, GL_RGBA, GL_UNSIGNED_BYTE, m_buffer );
        } else
	    glClear(GL_COLOR_BUFFER_BIT);
        swapBuffers();
        m_mutex.unlock();
    }
    XUnlockDisplay(x11Display());
}


void k9GLWidget::initializeGL() {
    setAutoBufferSwap(FALSE);
    glClearColor (0.0, 0.0, 0.0, 0.0);
    glShadeModel(GL_FLAT);
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    glDisable(GL_ALPHA_TEST);
    glDisable(GL_BLEND);
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_DITHER);
    glDisable(GL_FOG);
    glDisable(GL_LIGHTING);
    glDisable(GL_LOGIC_OP);
    glDisable(GL_STENCIL_TEST);
    glDisable(GL_TEXTURE_1D);
    glDisable(GL_TEXTURE_2D);

    glPixelTransferi(GL_MAP_COLOR, GL_FALSE);
    glPixelTransferi(GL_RED_SCALE, 1);
    glPixelTransferi(GL_RED_BIAS, 0);
    glPixelTransferi(GL_GREEN_SCALE, 1);
    glPixelTransferi(GL_GREEN_BIAS, 0);
    glPixelTransferi(GL_BLUE_SCALE, 1);
    glPixelTransferi(GL_BLUE_BIAS, 0);
    glPixelTransferi(GL_ALPHA_SCALE, 1);
    glPixelTransferi(GL_ALPHA_BIAS, 0);

    /*
     * Disable extensions that could slow down glDrawPixels.
     */
    const GLubyte* extString = glGetString(GL_EXTENSIONS);

    if (extString != NULL) {
        if (strstr((char*) extString, "GL_EXT_convolution") != NULL) {
            glDisable(GL_CONVOLUTION_1D_EXT);
            glDisable(GL_CONVOLUTION_2D_EXT);
            glDisable(GL_SEPARABLE_2D_EXT);
        }
        if (strstr((char*) extString, "GL_EXT_histogram") != NULL) {
            glDisable(GL_HISTOGRAM_EXT);
            glDisable(GL_MINMAX_EXT);
        }
        if (strstr((char*) extString, "GL_EXT_texture3D") != NULL) {
            glDisable(GL_TEXTURE_3D_EXT);
        }
    }

}

void k9GLWidget::resizeGL(int w, int h) {
    glViewport (0, 0, w, h);
    glMatrixMode (GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, w,0,h,-1,1);
    glMatrixMode (GL_MODELVIEW);
    glClear(GL_COLOR_BUFFER_BIT);
}


#include "k9glwidget.moc"

#endif
