output: drop wlr_output_impl.{attach,rollback}_render

No backend uses these anymore.

include/wlr/interfaces/wlr_output.h

@@ -51,19 +51,6 @@ struct wlr_output_impl {
 	 * Cleanup backend-specific resources tied to the output.
 	 */
 	void (*destroy)(struct wlr_output *output);
-	/**
-	 * Make the output's back-buffer current for the renderer.
-	 *
-	 * buffer_age must be set to the buffer age in number of frames, or -1 if
-	 * unknown.
-	 */
-	bool (*attach_render)(struct wlr_output *output, int *buffer_age);
-	/**
-	 * Unset the current renderer's buffer.
-	 *
-	 * This is the opposite of attach_render.
-	 */
-	void (*rollback_render)(struct wlr_output *output);
 	/**
 	 * Check that the pending output state is a valid configuration.
 	 *

types/wlr_output.c

@@ -344,9 +344,6 @@ static void handle_display_destroy(struct wl_listener *listener, void *data) {
 void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
 		const struct wlr_output_impl *impl, struct wl_display *display) {
 	assert(impl->commit);
-	if (impl->attach_render || impl->rollback_render) {
-		assert(impl->attach_render && impl->rollback_render);
-	}
 	if (impl->set_cursor || impl->move_cursor) {
 		assert(impl->set_cursor && impl->move_cursor);
 	}
@@ -582,21 +579,10 @@ static void output_clear_back_buffer(struct wlr_output *output) {
 }
 
 bool wlr_output_attach_render(struct wlr_output *output, int *buffer_age) {
-	if (output->impl->attach_render) {
-		if (!output->impl->attach_render(output, buffer_age)) {
-			return false;
-		}
-
-		output_state_clear_buffer(&output->pending);
-		output->pending.committed |= WLR_OUTPUT_STATE_BUFFER;
-		output->pending.buffer_type = WLR_OUTPUT_STATE_BUFFER_RENDER;
-	} else {
-		if (!output_attach_back_buffer(output, buffer_age)) {
-			return false;
-		}
-		wlr_output_attach_buffer(output, output->back_buffer);
+	if (!output_attach_back_buffer(output, buffer_age)) {
+		return false;
 	}
-
+	wlr_output_attach_buffer(output, output->back_buffer);
 	return true;
 }
 
@@ -606,23 +592,13 @@ uint32_t wlr_output_preferred_read_format(struct wlr_output *output) {
 		return DRM_FORMAT_INVALID;
 	}
 
-	if (output->impl->attach_render) {
-		if (!output->impl->attach_render(output, NULL)) {
-			return false;
-		}
-	} else {
-		if (!output_attach_back_buffer(output, NULL)) {
-			return false;
-		}
+	if (!output_attach_back_buffer(output, NULL)) {
+		return false;
 	}
 
 	uint32_t fmt = renderer->impl->preferred_read_format(renderer);
 
-	if (output->impl->rollback_render) {
-		output->impl->rollback_render(output);
-	} else {
-		output_clear_back_buffer(output);
-	}
+	output_clear_back_buffer(output);
 
 	return fmt;
 }
@@ -927,13 +903,7 @@ bool wlr_output_commit(struct wlr_output *output) {
 }
 
 void wlr_output_rollback(struct wlr_output *output) {
-	if (output->impl->rollback_render &&
-			(output->pending.committed & WLR_OUTPUT_STATE_BUFFER) &&
-			output->pending.buffer_type == WLR_OUTPUT_STATE_BUFFER_RENDER) {
-		output->impl->rollback_render(output);
-	}
 	output_clear_back_buffer(output);
-
 	output_state_clear(&output->pending);
 }