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Add wlr_output_impl.rollback

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Most of the pending output state is not forwarded to the backend prior
to an output commit. For instance, wlr_output_set_mode just stashes the
mode without calling any wlr_output_impl function.
wlr_output_impl.commit is responsible for applying the pending mode.

However, there are exceptions to this rule. The first one is
wlr_output_attach_render. It won't go away before renderer v6 is
complete, because it needs to set the current EGL surface.

The second one is wlr_output_attach_buffer.
wlr_output_impl.attach_buffer is removed in [1].

When wlr_output_rollback is called, all pending state is supposed to be
cleared. This works for all the state except the two exceptions
mentionned above. To fix this, introduce wlr_output_impl.rollback.

Right now, the backend resets the current EGL surface. This prevents GL
commands from affecting the output after wlr_output_rollback.

This patch is required for FBO-based outputs to work properly. The
compositor might be using FBOs for its own purposes [2], having leftover
FBO state can have bad consequences.

[1]: https://github.com/swaywm/wlroots/pull/2097
[2]: https://github.com/swaywm/wlroots/pull/2063#issuecomment-597614312
This commit is contained in:
Simon Ser 2020-04-06 11:53:20 +02:00 • committed by Drew DeVault
parent d3bd5f2a7b
commit 507d9bc19e
6 changed files with 31 additions and 0 deletions
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7
backend/wayland/output.c
View file

@ -302,6 +302,12 @@ static bool output_commit(struct wlr_output *wlr_output) {
return true;
}
static void output_rollback(struct wlr_output *wlr_output) {
struct wlr_wl_output *output =
get_wl_output_from_output(wlr_output);
wlr_egl_make_current(&output->backend->egl, EGL_NO_SURFACE, NULL);
}
static bool output_set_cursor(struct wlr_output *wlr_output,
struct wlr_texture *texture, int32_t scale,
enum wl_output_transform transform,
@ -431,6 +437,7 @@ static const struct wlr_output_impl output_impl = {
.attach_render = output_attach_render,
.test = output_test,
.commit = output_commit,
.rollback = output_rollback,
.set_cursor = output_set_cursor,
.move_cursor = output_move_cursor,
};