Add wlr_output_impl.rollback
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
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@ -574,6 +574,11 @@ static bool drm_connector_commit(struct wlr_output *output) {
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return true;
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}
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static void drm_connector_rollback(struct wlr_output *output) {
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struct wlr_drm_backend *drm = get_drm_backend_from_backend(output->backend);
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wlr_egl_make_current(&drm->renderer.egl, EGL_NO_SURFACE, NULL);
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}
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static void fill_empty_gamma_table(size_t size,
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uint16_t *r, uint16_t *g, uint16_t *b) {
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assert(0xFFFF < UINT64_MAX / (size - 1));
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@ -1094,6 +1099,7 @@ static const struct wlr_output_impl output_impl = {
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.attach_render = drm_connector_attach_render,
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.test = drm_connector_test,
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.commit = drm_connector_commit,
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.rollback = drm_connector_rollback,
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.set_gamma = set_drm_connector_gamma,
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.get_gamma_size = drm_connector_get_gamma_size,
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.export_dmabuf = drm_connector_export_dmabuf,
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@ -97,6 +97,12 @@ static bool output_commit(struct wlr_output *wlr_output) {
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return true;
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}
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static void output_rollback(struct wlr_output *wlr_output) {
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struct wlr_headless_output *output =
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headless_output_from_output(wlr_output);
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wlr_egl_make_current(&output->backend->egl, EGL_NO_SURFACE, NULL);
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}
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static void output_destroy(struct wlr_output *wlr_output) {
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struct wlr_headless_output *output =
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headless_output_from_output(wlr_output);
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@ -113,6 +119,7 @@ static const struct wlr_output_impl output_impl = {
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.destroy = output_destroy,
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.attach_render = output_attach_render,
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.commit = output_commit,
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.rollback = output_rollback,
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};
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bool wlr_output_is_headless(struct wlr_output *wlr_output) {
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@ -302,6 +302,12 @@ static bool output_commit(struct wlr_output *wlr_output) {
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return true;
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}
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static void output_rollback(struct wlr_output *wlr_output) {
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struct wlr_wl_output *output =
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get_wl_output_from_output(wlr_output);
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wlr_egl_make_current(&output->backend->egl, EGL_NO_SURFACE, NULL);
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}
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static bool output_set_cursor(struct wlr_output *wlr_output,
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struct wlr_texture *texture, int32_t scale,
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enum wl_output_transform transform,
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@ -431,6 +437,7 @@ static const struct wlr_output_impl output_impl = {
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.attach_render = output_attach_render,
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.test = output_test,
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.commit = output_commit,
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.rollback = output_rollback,
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.set_cursor = output_set_cursor,
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.move_cursor = output_move_cursor,
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};
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@ -162,11 +162,17 @@ static bool output_commit(struct wlr_output *wlr_output) {
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return true;
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}
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static void output_rollback(struct wlr_output *wlr_output) {
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struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
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wlr_egl_make_current(&output->x11->egl, EGL_NO_SURFACE, NULL);
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}
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static const struct wlr_output_impl output_impl = {
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.destroy = output_destroy,
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.attach_render = output_attach_render,
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.test = output_test,
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.commit = output_commit,
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.rollback = output_rollback,
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};
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struct wlr_output *wlr_x11_output_create(struct wlr_backend *backend) {
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@ -23,6 +23,7 @@ struct wlr_output_impl {
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bool (*attach_render)(struct wlr_output *output, int *buffer_age);
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bool (*test)(struct wlr_output *output);
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bool (*commit)(struct wlr_output *output);
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void (*rollback)(struct wlr_output *output);
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bool (*set_gamma)(struct wlr_output *output, size_t size,
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const uint16_t *r, const uint16_t *g, const uint16_t *b);
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size_t (*get_gamma_size)(struct wlr_output *output);
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@ -606,6 +606,10 @@ bool wlr_output_commit(struct wlr_output *output) {
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void wlr_output_rollback(struct wlr_output *output) {
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output_state_clear(&output->pending);
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if (output->impl->rollback) {
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output->impl->rollback(output);
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}
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}
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void wlr_output_attach_buffer(struct wlr_output *output,
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