[Mesa-dev] [PATCH 7/8] egl/wayland: Implement EGL_EXT_buffer_age

[Kristian Høgsberg]

---
 src/egl/drivers/dri2/platform_wayland.c |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/egl/drivers/dri2/platform_wayland.c b/src/egl/drivers/dri2/platform_wayland.c
index 3c6bdd9..6f8f3b0 100644
--- a/src/egl/drivers/dri2/platform_wayland.c
+++ b/src/egl/drivers/dri2/platform_wayland.c
@@ -449,6 +449,10 @@ dri2_swap_buffers(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *draw)
                              &wl_buffer_listener, dri2_surf);
    }
 
+   for (i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++)
+      if (dri2_surf->color_buffers[i].dri_buffer)
+         dri2_surf->color_buffers[i].age++;
+
    dri2_surf->back->locked = 1;
    dri2_surf->current = dri2_surf->back;
    dri2_surf->current->age = 1;
@@ -481,6 +485,21 @@ dri2_swap_buffers(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *draw)
    return EGL_TRUE;
 }
 
+static EGLint
+dri2_query_buffer_age(_EGLDriver *drv,
+                      _EGLDisplay *disp, _EGLSurface *surface)
+{
+   struct dri2_egl_surface *dri2_surf = dri2_egl_surface(surface);
+   __DRIbuffer buffer;
+
+   if (get_back_bo(dri2_surf, &buffer) < 0) {
+      _eglError(EGL_BAD_ALLOC, "dri2_query_buffer_age");
+      return 0;
+   }
+
+   return dri2_surf->back->age;
+}
+
 static int
 dri2_wayland_authenticate(_EGLDisplay *disp, uint32_t id)
 {
@@ -618,6 +637,7 @@ dri2_initialize_wayland(_EGLDriver *drv, _EGLDisplay *disp)
    drv->API.DestroySurface = dri2_destroy_surface;
    drv->API.SwapBuffers = dri2_swap_buffers;
    drv->API.Terminate = dri2_terminate;
+   drv->API.QueryBufferAge = dri2_query_buffer_age;
 
    dri2_dpy = calloc(1, sizeof *dri2_dpy);
    if (!dri2_dpy)
@@ -682,6 +702,7 @@ dri2_initialize_wayland(_EGLDriver *drv, _EGLDisplay *disp)
    }
 
    disp->Extensions.WL_bind_wayland_display = EGL_TRUE;
+   disp->Extensions.EXT_buffer_age = EGL_TRUE;
    dri2_dpy->authenticate = dri2_wayland_authenticate;
 
    /* we're supporting EGL 1.4 */
-- 
1.7.10.2