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From 32c2af6d7091a5964056f2d3006e333d3602bd82 Mon Sep 17 00:00:00 2001
From: Alyssa Ross <hi@alyssa.is>
Date: Tue, 25 Aug 2020 17:34:48 +0000
Subject: [PATCH 1/2] backend/wayland: downgrade to wl_compositor v3

Sommelier does not support v4.

Rather than calculating exact surface-relative damage regions instead
of the previous buffer-relative ones, just damage the whole surface.
It'll do for now.
---
 backend/wayland/backend.c | 6 +++++-
 backend/wayland/output.c  | 4 +++-
 include/backend/wayland.h | 1 +
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/backend/wayland/backend.c b/backend/wayland/backend.c
index 8de63acf..b1fddfc7 100644
--- a/backend/wayland/backend.c
+++ b/backend/wayland/backend.c
@@ -101,7 +101,7 @@ static void registry_global(void *data, struct wl_registry *registry,
 
 	if (strcmp(iface, wl_compositor_interface.name) == 0) {
 		wl->compositor = wl_registry_bind(registry, name,
-			&wl_compositor_interface, 4);
+			&wl_compositor_interface, wl_compositor_version());
 	} else if (strcmp(iface, wl_seat_interface.name) == 0) {
 		wl->seat = wl_registry_bind(registry, name,
 			&wl_seat_interface, 5);
@@ -244,6 +244,10 @@ bool wlr_backend_is_wl(struct wlr_backend *b) {
 	return b->impl == &backend_impl;
 }
 
+uint32_t wl_compositor_version(void) {
+	return getenv("SOMMELIER_VERSION") ? 3 : 4;
+}
+
 static void handle_display_destroy(struct wl_listener *listener, void *data) {
 	struct wlr_wl_backend *wl =
 		wl_container_of(listener, wl, local_display_destroy);
diff --git a/backend/wayland/output.c b/backend/wayland/output.c
index bd17fa20..d91c5cc0 100644
--- a/backend/wayland/output.c
+++ b/backend/wayland/output.c
@@ -262,7 +262,9 @@ static bool output_commit(struct wlr_output *wlr_output) {
 
 			wl_surface_attach(output->surface, buffer->wl_buffer, 0, 0);
 
-			if (damage == NULL) {
+			if (wl_compositor_version() < 4) {
+				wl_surface_damage(output->surface, 0, 0, INT32_MAX, INT32_MAX);
+			} else if (damage == NULL) {
 				wl_surface_damage_buffer(output->surface,
 					0, 0, INT32_MAX, INT32_MAX);
 			} else {
diff --git a/include/backend/wayland.h b/include/backend/wayland.h
index 9a8a404b..9d7b5eb4 100644
--- a/include/backend/wayland.h
+++ b/include/backend/wayland.h
@@ -114,6 +114,7 @@ void create_wl_pointer(struct wl_pointer *wl_pointer, struct wlr_wl_output *outp
 void create_wl_keyboard(struct wl_keyboard *wl_keyboard, struct wlr_wl_backend *wl);
 struct wlr_wl_input_device *create_wl_input_device(
 	struct wlr_wl_backend *backend, enum wlr_input_device_type type);
+uint32_t wl_compositor_version(void);
 
 extern const struct wl_seat_listener seat_listener;
 
-- 
2.27.0