On Mon, 2018-08-13 at 16:32 -0700, Kristian Høgsberg wrote:
> On Mon, Aug 13, 2018 at 3:53 AM Emil Velikov <[email protected]> wrote:
> >
> > So if I understood you correctly [and the spec] there is no
> > requirement (nor ban) on rendering to pbuffers from X11.
> > It's an implementation decision to allow it.
>
> You can't render to the underlying pixmaps, since the drawable ID is
> internal to the GLX implementation.
This might be a desirable property, but it's not what xserver
implements. req->pbuffer is the last argument (glxDrawableId) to
DoCreatePbuffer, which has:
/* Assign the pixmap the same id as the pbuffer and add it as a
* resource so it and the DRI2 drawable will be reclaimed when the
* pbuffer is destroyed. */
pPixmap->drawable.id = glxDrawableId;
if (!AddResource(pPixmap->drawable.id, RT_PIXMAP, pPixmap))
return BadAlloc;
See obviously bogus demo (attached), which succeeds instead of throwing
BadPixmap.
- ajax#include <X11/Xlib.h>
#include <GL/glx.h>
int main(void) {
Display *dpy;
GLXFBConfig *cfg;
GLXPbuffer pb;
int junk;
const int cfg_attr[] = {
GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT,
None,
};
const int pb_attr[] = {
GLX_PBUFFER_WIDTH, 32,
GLX_PBUFFER_HEIGHT, 32,
None,
};
dpy = XOpenDisplay(NULL);
cfg = glXChooseFBConfig(dpy, 0, cfg_attr, &junk);
pb = glXCreatePbuffer(dpy, *cfg, pb_attr);
XFreePixmap(dpy, pb);
XSync(dpy, 0);
XCloseDisplay(dpy);
return 0;
}
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