[PATCH v2 10/12] spice/gl: create dummy primary surface (RfC)

[Gerd Hoffmann <kraxel@xxxxxxxxxx>]

Current spice client expects we create a primary surface,
even if we do display updates using dma-bufs exclusively.

So just do that to get things going.

Not fully clear whenever that is intentional or a bug on
the spice side, so I keep this as separate patch for now.

I think this should either be squashed into the previous
patch, or dropped after fixing things on the spice side.

Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
---
 ui/spice-display.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/ui/spice-display.c b/ui/spice-display.c
index 15d7906..96beb02 100644
--- a/ui/spice-display.c
+++ b/ui/spice-display.c
@@ -856,13 +856,27 @@ static void spice_gl_switch(DisplayChangeListener *dcl,
 {
     SimpleSpiceDisplay *ssd = container_of(dcl, SimpleSpiceDisplay, dcl);
     EGLint stride, fourcc;
+    bool resize = true;
     int fd;
 
+    if (ssd->ds && new_surface &&
+        surface_width(ssd->ds)  == surface_width(new_surface)  &&
+        surface_height(ssd->ds) == surface_height(new_surface) &&
+        surface_format(ssd->ds) == surface_format(new_surface)) {
+        resize = false;
+    }
+
     if (ssd->ds) {
         surface_gl_destroy_texture(ssd->gls, ssd->ds);
+        if (resize) {
+            qemu_spice_destroy_host_primary(ssd);
+        }
     }
     ssd->ds = new_surface;
     if (ssd->ds) {
+        if (resize) {
+            qemu_spice_create_host_primary(ssd);
+        }
         surface_gl_create_texture(ssd->gls, ssd->ds);
         fd = egl_get_fd_for_texture(ssd->ds->texture,
                                     &stride, &fourcc);
-- 
1.8.3.1

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