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編輯時從原來的職位簡化生產GLX錯誤：XLIB與調用XCreateWindow（）
我收到以下錯誤：
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 1 (X_CreateWindow)
Serial number of failed request: 38
Current serial number in output stream: 41
從我的角度來看，代碼在崩潰使用下面的代碼窗口對象（見下文）調用XCreateWindow()時：
app object
#ifndef APP_H
#define APP_H
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <GL/glx.h>
#include <GL/gl.h>
#include <GL/glu.h>
class app
{
public:
app();
void run();
Display *getDisplay();
Display *_xDisplay;
};
#endif // APP_H
#include "app.h"
app::app()
{
_xDisplay = XOpenDisplay(NULL);
if (_xDisplay == NULL)
throw "Failed to get XDisplay";
}
Display *app::getDisplay()
{
return _xDisplay;
}
void app::run()
{
static bool run = true;
static Display *lDisplay = _xDisplay;
XEvent xEvent;
while (run)
{
do
{
XNextEvent(lDisplay, &xEvent);
switch (xEvent.type)
{
}
} while (_xDisplay);
}
}
window object
#ifndef WINDOW_H
#define WINDOW_H
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <GL/glx.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include "app.h"
class app;
class ogldevice;
class window
{
public:
window(app *a);
app *a;
ogldevice *od;
Window xWindow;
};
#endif // WINDOW_H
#include "window.h"
#include "ogldevice.h"
window::window(app *a) :
a(a)
{
int width = 800;
int height = 800;
od = new ogldevice(a);
Display *xDisplay = a->getDisplay();
unsigned long valuemask = CWEventMask | CWBackPixel | CWBorderPixel | CWCursor;
XSetWindowAttributes xAttributes;
xAttributes.border_pixel = 0;
xAttributes.colormap = od->glxDevice.glxColorMap;
xAttributes.event_mask = ExposureMask | KeyPressMask | ButtonPress |
StructureNotifyMask | ButtonReleaseMask |
KeyReleaseMask | EnterWindowMask | LeaveWindowMask |
PointerMotionMask | Button1MotionMask | VisibilityChangeMask |
ColormapChangeMask;
xWindow = XCreateWindow(
xDisplay,
RootWindow(xDisplay, od->glxDevice.xVisual->screen),
0, 0,
width, height,
0,
od->glxDevice.xVisual->depth,
InputOutput,
od->glxDevice.xVisual->visual,
valuemask,
&xAttributes
);
XSetStandardProperties(
xDisplay,
xWindow,
"glxsimple",
"glxsimple",
None,
NULL,
0,
NULL
);
XMapWindow(a->getDisplay(), xWindow);
}
ogldevice object
#ifndef OGLDEVICE_H
#define OGLDEVICE_H
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <GL/glx.h>
#include <GL/gl.h>
#include <GL/glu.h>
class app;
class ogldevice
{
public:
ogldevice(app *a);
struct GlxDevice
{
XVisualInfo *xVisual;
Colormap glxColorMap;
GLXContext glxContext;
} glxDevice;
app *a;
};
#endif // OGLDEVICE_H
#include "ogldevice.h"
#include "app.h"
ogldevice::ogldevice(app *a) :
a(a)
{
int errno, extension;
if (!glXQueryExtension(a->getDisplay(), &errno, &extension))
{
throw "Glx Extension not Supported";
}
static int glx_attributes[] = {
GLX_RGBA,
GLX_RED_SIZE, 4,
GLX_GREEN_SIZE, 4,
GLX_BLUE_SIZE, 4,
GLX_DOUBLEBUFFER,
None
};
glxDevice.xVisual = glXChooseVisual(
a->getDisplay(),
DefaultScreen(a->getDisplay()),
glx_attributes
);
if (glxDevice.xVisual == NULL)
throw "Failure to get Double Buffer";
glxDevice.glxContext = glXCreateContext(
a->getDisplay(),
glxDevice.xVisual,
None, /* Don't share display lists */
True
);
if (glxDevice.glxContext == NULL)
throw "Failure to get GLX Context";
glxDevice.glxColorMap = XCreateColormap(
a->getDisplay(),
RootWindow(a->getDisplay(), glxDevice.xVisual->screen),
glxDevice.xVisual->visual,
AllocNone
);
}
driver
#include "app.h"
#include "window.h"
int main(int argc, char *argv[])
{
app *a = new app();
window *w = new window(a);
a->run();
delete a;
delete w;
return 0;
}
我的Fedora 14，RHEL 6.1和Ubuntu 10.04 LTS運行時，得到同樣的錯誤。這導致我相信這是我傳遞給glxChooseVisual的glx屬性的一個問題。
發佈一個完整的，最小的示例來演示問題。 – genpfault 2012-02-21 20:06:33
我正在努力做到這一點。我有一個簡單的例子，我拿了包裝在課堂上。 C代碼保持不變，但是當放在我的課堂時，它全部崩潰。我試圖理解爲什麼。我會看看我能做些什麼。 – user1224210 2012-02-21 20:18:03
@genpfault：我已將示例更新爲我正在嘗試執行的最簡單形式，並且能夠重現錯誤。您的進一步洞察力非常令人滿意。 – user1224210 2012-02-21 20:58:59