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glamor: Add glamor_shareable_fd_from_pixmap()

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Add glamor_shareable_fd_from_pixmap function to get dma-buf fds suitable
for sharing across GPUs (not using GPU specific tiling).

This is necessary for the modesetting driver to correctly implement
the DRI2 SharePixmapBacking callback.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Hans de Goede 2016-08-23 12:18:56 +02:00
commit a74d553cb9
2 changed files with 40 additions and 0 deletions
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20
glamor/glamor.c
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@ -821,6 +821,26 @@ glamor_fd_from_pixmap(ScreenPtr screen,
return -1;
}
_X_EXPORT int
glamor_shareable_fd_from_pixmap(ScreenPtr screen,
PixmapPtr pixmap, CARD16 *stride, CARD32 *size)
{
unsigned orig_usage_hint = pixmap->usage_hint;
int ret;
/*
* The actual difference between a sharable and non sharable buffer
* is decided 4 call levels deep in glamor_make_pixmap_exportable()
* based on pixmap->usage_hint == CREATE_PIXMAP_USAGE_SHARED
* 2 of those calls are also exported API, so we cannot just add a flag.
*/
pixmap->usage_hint = CREATE_PIXMAP_USAGE_SHARED;
ret = glamor_fd_from_pixmap(screen, pixmap, stride, size);
pixmap->usage_hint = orig_usage_hint;
return ret;
}
int
glamor_name_from_pixmap(PixmapPtr pixmap, CARD16 *stride, CARD32 *size)
{