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xwayland: allow using linux-dmabuf with DRM_FORMAT_MOD_INVALID 

When the linux-dmabuf protocol is available, prefer it over the old
wl_drm protocol. Previously wl_drm was used when modifiers aren't
supported, however linux-dmabuf supports formats without modifiers too.
In this case, linux-dmabuf will send a DRM_FORMAT_MOD_INVALID modifier
for each supported format [1].

This allows compositors to better handle these buffers, getting a
DMA-BUF and implementing features like direct scan-out.

A similar logic has been implemented for EGL [2].

DRM_FORMAT_MOD_INVALID is now stored in the xwl_screen->formats list.
glamor_get_modifiers still returns FALSE with zero modifiers if the
only advertised modifier is DRM_FORMAT_MOD_INVALID.

[1]: fb9b2a8731
[2]: c376865f5e

Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
This commit is contained in:
Simon Ser 2020-06-02 15:40:16 +02:00 committed by Michel Dänzer
parent c0e13cbf5a
commit d6558477d7
1 changed files with 3 additions and 5 deletions
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8
hw/xwayland/xwayland-glamor-gbm.c
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@ -668,7 +668,9 @@ glamor_get_modifiers(ScreenPtr screen, uint32_t format,
}
}
if (!xwl_format)
if (!xwl_format ||
(xwl_format->num_modifiers == 1 &&
xwl_format->modifiers[0] == DRM_FORMAT_MOD_INVALID))
return FALSE;
*modifiers = calloc(xwl_format->num_modifiers, sizeof(uint64_t));
@ -832,10 +834,6 @@ xwl_dmabuf_handle_modifier(void *data, struct zwp_linux_dmabuf_v1 *dmabuf,
struct xwl_format *xwl_format = NULL;
int i;
if (modifier_hi == (DRM_FORMAT_MOD_INVALID >> 32) &&
modifier_lo == (DRM_FORMAT_MOD_INVALID & 0xffffffff))
return;
for (i = 0; i < xwl_screen->num_formats; i++) {
if (xwl_screen->formats[i].format == format) {
xwl_format = &xwl_screen->formats[i];