argInit() 함수 분석

 이 함수는 윈도우 생성과 opengl 설정, 내부변수 저장을 담당한다. 포팅시 변수에 전달하는 값을 잘 확인해야함.

void argInit( ARParam *cparam, double zoom, int fullFlag, int xwin, int ywin, int hmd_flag )
{
 //캠에 대한 초기화 값 및 윈도우 생성관련 값을 내부 변수에 저장한다.
    int       i;

    gl_hmd_flag = hmd_flag;
    gZoom  = zoom;
    gImXsize = cparam->xsize;
    gImYsize = cparam->ysize;
    if( gl_hmd_flag == 0 ) {
        gXsize = (double)cparam->xsize * gZoom;
        gYsize = (double)cparam->ysize * gZoom;
    }
    else {
        gXsize = AR_HMD_XSIZE;
        gYsize = AR_HMD_YSIZE;
    }
    gMiniXsize = (double)cparam->xsize * gZoom / GMINI;
    gMiniYsize = (double)cparam->ysize * gZoom / GMINI;

    if( xwin * ywin > MINIWIN_MAX ) {
        if( xwin > MINIWIN_MAX ) xwin = MINIWIN_MAX;
        ywin = MINIWIN_MAX / xwin;
    }
    gMiniXnum = xwin;
    gMiniYnum = ywin;
    gWinXsize = (gMiniXsize*gMiniXnum > gXsize)?
                     gMiniXsize*gMiniXnum: gXsize;
    gWinYsize = gYsize + gMiniYsize*gMiniYnum;

    gCparam = *cparam;
    for( i = 0; i < 4; i++ ) {
        gCparam.mat[1][i] = (gCparam.ysize-1)*(gCparam.mat[2][i]) - gCparam.mat[1][i];
    }
    argConvGLcpara( &gCparam, AR_GL_CLIP_NEAR, AR_GL_CLIP_FAR, gl_cpara );

    argInit2( fullFlag );//윈도우 생성
}

static void argInit2( int fullFlag )
{
 //glut를 사용해 윈도우 생성.
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_STENCIL);
    glutInitWindowPosition(0, 0);
    glutInitWindowSize(gWinXsize, gWinYsize);
    win = glutCreateWindow("");
    if( fullFlag ) {
        glutFullScreen();
        gWinXsize = glutGet(GLUT_SCREEN_WIDTH);
        gWinYsize = glutGet(GLUT_SCREEN_HEIGHT);
    }

#ifdef AR_OPENGL_TEXTURE_RECTANGLE
#if defined(GL_TEXTURE_RECTANGLE_EXT)
    if( glutExtensionSupported("GL_EXT_texture_rectangle") ) {
        useTextureRectangle = 1;
        glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_EXT, &maxRectangleTextureSize);
    }
#elif defined(GL_TEXTURE_RECTANGLE_NV)
    if( glutExtensionSupported("GL_NV_texture_rectangle") ) {
        useTextureRectangle = 1;
        glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_NV, &maxRectangleTextureSize);
    }
#endif
#endif

    gMouseFunc = NULL;
    gKeyFunc   = NULL;
    gMainFunc  = NULL;

 //텍스쳐 파라미터 설정
    glGenTextures(4, glid);
    glBindTexture( GL_TEXTURE_2D, glid[0] );
    glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
    glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL );
    glBindTexture( GL_TEXTURE_2D, glid[1] );
    glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
    glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL );
    glBindTexture( GL_TEXTURE_2D, glid[2] );
    glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
    glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL );

    if( gImXsize > 512 ) {
        tex1Xsize1 = 512;
        tex1Xsize2 = 1;
        while( tex1Xsize2 < gImXsize - tex1Xsize1 ) tex1Xsize2 *= 2;
    }
    else {
        tex1Xsize1 = 1;
        while( tex1Xsize1 < gImXsize ) tex1Xsize1 *= 2;
    }
    tex1Ysize  = 1;
    while( tex1Ysize < gImYsize ) tex1Ysize *= 2;

    tex2Xsize = 1;
    while( tex2Xsize < gImXsize/2 ) tex2Xsize *= 2;
    tex2Ysize = 1;
    while( tex2Ysize < gImYsize/2 ) tex2Ysize *= 2;
}