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x11: Clean up sacrificial GL context code.

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Check for failures, restore any previously-current context.
This commit is contained in:
Ryan C. Gordon 2017-09-01 13:57:40 -04:00
parent 507659c6ac
commit 4649ac463c
1 changed files with 30 additions and 19 deletions
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35
src/video/x11/SDL_x11opengl.c
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@ -331,31 +331,41 @@ X11_GL_InitExtensions(_THIS)
{
Display *display = ((SDL_VideoData *) _this->driverdata)->display;
const int screen = DefaultScreen(display);
XVisualInfo *vinfo;
XSetWindowAttributes xattr;
Window w;
GLXContext context;
XVisualInfo *vinfo = NULL;
Window w = 0;
GLXContext current_context = 0;
GLXContext context = 0;
const char *(*glXQueryExtensionsStringFunc) (Display *, int);
const char *extensions;
vinfo = X11_GL_GetVisual(_this, display, screen);
if (!vinfo) {
return;
}
if (vinfo) {
GLXContext (*glXGetCurrentContextFunc) (void) =
(GLXContext(*)(void))
X11_GL_GetProcAddress(_this, "glXGetCurrentContextFunc");
if (glXGetCurrentContextFunc) {
XSetWindowAttributes xattr;
current_context = glXGetCurrentContextFunc();
xattr.background_pixel = 0;
xattr.border_pixel = 0;
xattr.colormap =
X11_XCreateColormap(display, RootWindow(display, screen), vinfo->visual,
AllocNone);
w = X11_XCreateWindow(display, RootWindow(display, screen), 0, 0, 32, 32, 0,
vinfo->depth, InputOutput, vinfo->visual,
X11_XCreateColormap(display, RootWindow(display, screen),
vinfo->visual, AllocNone);
w = X11_XCreateWindow(display, RootWindow(display, screen), 0, 0,
32, 32, 0, vinfo->depth, InputOutput, vinfo->visual,
(CWBackPixel | CWBorderPixel | CWColormap), &xattr);
context = _this->gl_data->glXCreateContext(display, vinfo, NULL, True);
context = _this->gl_data->glXCreateContext(display, vinfo,
NULL, True);
if (context) {
_this->gl_data->glXMakeCurrent(display, w, context);
}
}
X11_XFree(vinfo);
}
glXQueryExtensionsStringFunc =
(const char *(*)(Display *, int)) X11_GL_GetProcAddress(_this,
@ -442,6 +452,7 @@ X11_GL_InitExtensions(_THIS)
if (context) {
_this->gl_data->glXMakeCurrent(display, None, NULL);
_this->gl_data->glXDestroyContext(display, context);
_this->gl_data->glXMakeCurrent(display, w, current_context);
}
X11_XDestroyWindow(display, w);