virtio-gpu: Get EGL Display callback

Implement get_egl_display callback for virglrenderer.

Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>

hw/display/virtio-gpu-virgl.c

@@ -18,6 +18,7 @@
 #include "hw/virtio/virtio-gpu.h"
 #include "hw/virtio/virtio-gpu-bswap.h"
 #include "hw/virtio/virtio-iommu.h"
+#include <epoxy/egl.h>
 
 #include <virglrenderer.h>
 
@@ -743,12 +744,24 @@ static int virgl_make_context_current(void *opaque, int scanout_idx,
                                    qctx);
 }
 
+static void *virgl_get_egl_display(void *opaque)
+{
+    return eglGetCurrentDisplay();
+}
+
 static struct virgl_renderer_callbacks virtio_gpu_3d_cbs = {
+#ifdef HAVE_VIRGL_CBS_GET_EGL_DISPLAY
+    .version             = 4,
+#else
     .version = 1,
+#endif
     .write_fence         = virgl_write_fence,
     .create_gl_context   = virgl_create_context,
     .destroy_gl_context  = virgl_destroy_context,
     .make_current        = virgl_make_context_current,
+#ifdef HAVE_VIRGL_CBS_GET_EGL_DISPLAY
+    .get_egl_display     = virgl_get_egl_display,
+#endif
 };
 
 static void virtio_gpu_print_stats(void *opaque)

meson.build

@@ -746,6 +746,11 @@ if not get_option('virglrenderer').auto() or have_system or have_vhost_user_gpu
                        cc.has_function('virgl_renderer_context_create_with_flags',
                                        prefix: '#include <virglrenderer.h>',
                                        dependencies: virgl))
+  config_host_data.set('HAVE_VIRGL_CBS_GET_EGL_DISPLAY',
+                       cc.has_member('struct virgl_renderer_callbacks',
+                                     'get_egl_display',
+                                     prefix: '#include <virglrenderer.h>',
+                                     dependencies: virgl))
 endif
 curl = not_found
 if not get_option('curl').auto() or have_block