我正在尝试在 linux red-hat 上使用 GLFW 打开一个 OpenGL 全屏窗口。我有一个跨越两台显示器的桌面，总分辨率为 3840*1080。
我有两个问题： 1. 窗口只在一台显示器上打开，最大窗口宽度为 1920（单个显示器的宽度）。2、窗口最大高度为1003（我认为是屏幕高度减去任务栏和顶栏高度）。
这是我用来打开窗口的代码：
if (glfwInit() == GL_FALSE)
std::cout<< "Unable to initialize GLFW\n";
glfwOpenWindowHint(GLFW_STEREO, GL_FALSE);
if (glfwOpenWindow(3840,1080,8,8,8,0,24,0,GLFW_FULLSCREEN) == GL_FALSE)
std::cout<< "Unable to open window\n";
int width, height;
glfwGetWindowSize(&width, &height);
std::cout << "width = " << width << " height = " << height << "\n";
输出：宽度 = 1920 高度 = 1003
编辑：我使用 xrandr 检查可用的屏幕模式并得到：
屏幕 0：最小 3840 x 1080，当前 3840 x 1080，最大 3840 x 1080 默认连接 3840x1080+0+0 0mm x 0mm 3840x1080 50.0*
EDIT2：我已更改代码以使用 X11 打开窗口
int doubleBufferAttributes[] = {
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_DOUBLEBUFFER, True, /* Request a double-buffered color buffer with */
GLX_RED_SIZE, 1, /* the maximum number of bits per component */
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
None
};
static Bool WaitForNotify( Display *dpy, XEvent *event, XPointer arg ) {
return (event->type == MapNotify) && (event->xmap.window == (Window) arg);
}
int main( int argc, char *argv[] )
{
Display *dpy;
Window xWin;
XEvent event;
XVisualInfo *vInfo;
XSetWindowAttributes swa;
GLXFBConfig *fbConfigs;
GLXContext context;
GLXWindow glxWin;
int swaMask;
int numReturned;
int swapFlag = True;
/* Open a connection to the X server */
dpy = XOpenDisplay( NULL );
if ( dpy == NULL ) {
printf( "Unable to open a connection to the X server\n" );
exit( EXIT_FAILURE );
}
/* Request a suitable framebuffer configuration - try for a double
** buffered configuration first */
fbConfigs = glXChooseFBConfig( dpy, DefaultScreen(dpy),
doubleBufferAttributes, &numReturned );
/* Create an X colormap and window with a visual matching the first
** returned framebuffer config */
vInfo = glXGetVisualFromFBConfig( dpy, fbConfigs[0] );
swa.border_pixel = 0;
swa.event_mask = StructureNotifyMask;
swa.colormap = XCreateColormap( dpy, RootWindow(dpy, vInfo->screen),
vInfo->visual, AllocNone );
swaMask = CWBorderPixel | CWColormap | CWEventMask;
xWin = XCreateWindow( dpy, RootWindow(dpy, vInfo->screen), 0, 0, 3840, 1080,
0, vInfo->depth, InputOutput, vInfo->visual,
swaMask, &swa );
XWindowAttributes attt;
XGetWindowAttributes( dpy,xWin, &attt);
std::cout << "he = " << attt.height << " wi = " << attt.width << "\n";
/* Create a GLX context for OpenGL rendering */
context = glXCreateNewContext( dpy, fbConfigs[0], GLX_RGBA_TYPE,
NULL, True );
XGetWindowAttributes( dpy,xWin, &attt);
std::cout << "2he = " << attt.height << " wi = " << attt.width << "\n";
/* Create a GLX window to associate the frame buffer configuration
** with the created X window */
glxWin = glXCreateWindow( dpy, fbConfigs[0], xWin, NULL );
XGetWindowAttributes( dpy,xWin, &attt);
std::cout << "3he = " << attt.height << " wi = " << attt.width << "\n";
/* Map the window to the screen, and wait for it to appear */
XMapWindow( dpy, xWin );
XGetWindowAttributes( dpy,xWin, &attt);
std::cout << "4he = " << attt.height << " wi = " << attt.width << "\n";
XIfEvent( dpy, &event, WaitForNotify, (XPointer) xWin );
XGetWindowAttributes( dpy,xWin, &attt);
std::cout << "5he = " << attt.height << " wi = " << attt.width << "\n";
/* Bind the GLX context to the Window */
glXMakeContextCurrent( dpy, glxWin, glxWin, context );
XGetWindowAttributes( dpy,xWin, &attt);
std::cout << "6he = " << attt.height << " wi = " << attt.width << "\n";
输出是：
he = 1080 wi = 3840
2he = 1080 wi = 3840
3he = 1080 wi = 3840
4he = 1080 wi = 3840
5he = 1003 wi = 1920
6he = 1003 wi = 1920
似乎当窗口显示时，它的大小会缩小。