output: rejigger attach/clear for back buffer

In wlr_output_attach_render(), stop setting
wlr_output.pending.buffer. This removes one footgun: using the
wlr_buffer at that stage is invalid, because rendering operations
haven't been flushed to the GPU yet. We need to wait until
output_clear_back_buffer() for the wlr_buffer to be used safely.

Instead, set wlr_output.pending.buffer in wlr_output_test() and
wlr_output_commit().

Additionally, move the output_clear_back_buffer() from
wlr_output_commit_state() to wlr_output_commit(). This reduces the
number of calls in the failure path.

0 files changed, 0 insertions, 0 deletions