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cogl: Trap GLX call with error trap

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This is a X request that may result in errors, so it is better
to have covered by an error trap.

It is thus far not, explicitly at least, which means other less
lenient error traps might not like what happens here. Make the
error trap threeway between backend, x11 and cogl happen less
by chance here.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2864>
This commit is contained in:
Carlos Garnacho 2023-03-03 19:23:18 +01:00 committed by Marge Bot
parent ae2ceeda0b
commit ab3b12052d
1 changed files with 5 additions and 1 deletions
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6
cogl/cogl/winsys/cogl-onscreen-glx.c
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@ -539,16 +539,20 @@ cogl_onscreen_glx_get_buffer_age (CoglOnscreen *onscreen)
CoglOnscreenGlx *onscreen_glx = COGL_ONSCREEN_GLX (onscreen);
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = cogl_framebuffer_get_context (framebuffer);
CoglDisplay *display = context->display;
CoglXlibRenderer *xlib_renderer = _cogl_xlib_renderer_get_data (context->display->renderer);
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
CoglXlibTrapState old_state;
GLXDrawable drawable;
unsigned int age;
unsigned int age = 0;
if (!_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_BUFFER_AGE))
return 0;
drawable = onscreen_glx->glxwin ? onscreen_glx->glxwin : onscreen_glx->xwin;
_cogl_xlib_renderer_trap_errors (display->renderer, &old_state);
glx_renderer->glXQueryDrawable (xlib_renderer->xdpy, drawable, GLX_BACK_BUFFER_AGE_EXT, &age);
_cogl_xlib_renderer_untrap_errors (display->renderer, &old_state);
return age;
}