//VideoGLWin.cpp
#include "StdAfx.h"
#include "VideoGLWin.h"

bool VideoGlWin::initOpenGL(void)
{
	if(m_openGLInitialized)
		return false;

	//initialize matrices
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(0,1,0,1);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glViewport(0,0,w(),h());

	m_openGLInitialized=true;

	return m_openGLInitialized;
}
void VideoGlWin::ShowAppMessage(void)
{
	glDisable(GL_TEXTURE_2D);
	glColor3f(0.618,0.618,0.618);
	glRasterPos2f(-0.75,0.75);
	gl_font(1,42);
	gl_draw("Video Player 1.0");	 
	
	const GLubyte* OpenGLVersion =glGetString(GL_VERSION);
	const GLubyte* OpenGLMaker = glGetString(GL_VENDOR); 
	const GLubyte* OpenGLRender = glGetString(GL_RENDERER); 
	char str[255];

	gl_font(1,14);

	//OpenGL information
	sprintf(str,"OpenGL Version: %s",OpenGLVersion);
	glRasterPos2f(-1.0,-0.5);gl_draw(str);	 

	sprintf(str,"OpenGL Maker: %s",OpenGLMaker);
	glRasterPos2f(-1.0,-0.55);gl_draw(str);	 
	
	sprintf(str,"OpenGL Render: %s",OpenGLRender);
	glRasterPos2f(-1.0,-0.60);gl_draw(str);	 

    //FLTK information
	//sprintf(str,"FLTK Version:
%d.%d.%d",FL_MAJOR_VERSION,FL_MINOR_VERSION,FL_PATCH_VERSION);
	sprintf(str,"FLTK Version: %4.3f",Fl::version());
	glRasterPos2f(-1.0,-0.70);gl_draw(str);

	//OpenCV version
	const char* opencv_libraries = 0;
	const char* addon_modules = 0;
	cvGetModuleInfo( 0, &opencv_libraries,&addon_modules );
	sprintf(str,"OpenCV: %s",opencv_libraries);
	glRasterPos2f(-1.0,-0.80);gl_draw(str);
	sprintf(str,"Add-on Modules: %s\n",addon_modules);
	glRasterPos2f(-1.0,-0.85);gl_draw(str);

}


///////////////////////////////////////////////////
// use texture to display a picture
///////////////////////////////////////////////////
bool VideoGlWin::upload_iplimage (const IplImage *img,GLuint& tex)
{
    GLint format, type;

    /* Set pixel format */
    switch(img->nChannels)
    {
        case 1:
            format = GL_LUMINANCE;
            break;
        case 3:
            format = GL_BGR_EXT;
            break;
        case 4:
            format = GL_BGRA_EXT;
        default:
            return 0;
    }

    /* Set pixel type */
    switch(img->depth)
    {
        case IPL_DEPTH_8U:
            type = GL_UNSIGNED_BYTE;
            break;
        case IPL_DEPTH_8S:
            type = GL_BYTE;
            break;
        case IPL_DEPTH_16U:
            type = GL_UNSIGNED_SHORT;
            break;
        case IPL_DEPTH_16S:
            type = GL_SHORT;
            break;
        case IPL_DEPTH_32S:
            type = GL_INT;
            break;
        case IPL_DEPTH_32F:
            type = GL_FLOAT;
            break;
        case IPL_DEPTH_64F:
            /* Not supported by OpenGL */
        default:
            return 0;
    }

	/* Create texture object */
    glGenTextures(1, &tex);
    glBindTexture(GL_TEXTURE_2D, tex);

	/* If necessary, specify texture parameters here */	
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);


    /* Now upload pixels */
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
                img->width, img->height, 0,
                format, type, img->imageData);

    return true;
}


void VideoGlWin::draw()
{
// the valid() property may be used to avoid reinitializing your
// GL transformation for each redraw:
  if (!valid()) {
    valid(1);
	glClear(GL_COLOR_BUFFER_BIT);
  }

  if(!m_processedImage)  
	  ShowAppMessage();
  else
  {
	  double ox,oy;
	  double x1,y1,x2,y2,x3,y3,x4,y4;
	  ox=xpan_ratio*(1.0+zoom_ratio); oy=-ypan_ratio*(1.0+zoom_ratio);
	  x1=ox-zoom_ratio; y1=oy-zoom_ratio;
	  x2=ox+zoom_ratio; y2=oy-zoom_ratio;
	  x3=ox+zoom_ratio; y3=oy+zoom_ratio;
	  x4=ox-zoom_ratio; y4=oy+zoom_ratio;

	  glEnable(GL_TEXTURE_2D);
	  upload_iplimage(m_processedImage,textureName);
	  glBindTexture(GL_TEXTURE_2D, textureName);  
	  glBegin( GL_QUADS );
	    glTexCoord2d(0.0,0.0); glVertex2d(x1,y1);
	    glTexCoord2d(1.0,0.0); glVertex2d(x2,y2);
	    glTexCoord2d(1.0,1.0); glVertex2d(x3,y3);
  	    glTexCoord2d(0.0,1.0); glVertex2d(x4,y4);
	  glEnd();
  }



}