From a2a5e8f4632374b4b322c0520b7e30e35e0d753a Mon Sep 17 00:00:00 2001
From: tesselslate <tesselslate@gmail.com>
Date: Mon, 4 Nov 2024 21:03:34 -0500
Subject: [PATCH] alpha-modifier-v1: implement protocol

Implement the alpha-modifier-v1 protocol, which allows clients to
offload alpha blending operations to the compositor.

wlroots' scene graph code takes care of updating the opacity of
wlr_scene_buffers with an associated wp_alpha_modifier_surface_v1.
---
 build.zig.zon    | 4 ++--
 river/Server.zig | 7 ++++++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/build.zig.zon b/build.zig.zon
index b35b27e..39ce52b 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -12,8 +12,8 @@
             .hash = "1220687c8c47a48ba285d26a05600f8700d37fc637e223ced3aa8324f3650bf52242",
         },
         .@"zig-wlroots" = .{
-            .url = "https://codeberg.org/ifreund/zig-wlroots/archive/e486223799648d27e8b91c5fe0ea4c088b74b707.tar.gz",
-            .hash = "1220aeb3317e16c38583839961c9d695fa60d23a3d506c8275fb0e8fa9849844f2f7",
+            .url = "https://codeberg.org/ifreund/zig-wlroots/archive/afbbbbe5579c750feed8de12b073fa50b0651137.tar.gz",
+            .hash = "122060ddef836b7872cb2088764a8bd2fb2e9254327673e8176b7f7a621ec897484f",
         },
         .@"zig-xkbcommon" = .{
             .url = "https://codeberg.org/ifreund/zig-xkbcommon/archive/v0.2.0.tar.gz",
diff --git a/river/Server.zig b/river/Server.zig
index 8fc7422..027e777 100644
--- a/river/Server.zig
+++ b/river/Server.zig
@@ -86,6 +86,8 @@ foreign_toplevel_manager: *wlr.ForeignToplevelManagerV1,
 
 tearing_control_manager: *wlr.TearingControlManagerV1,
 
+alpha_modifier: *wlr.AlphaModifierV1,
+
 input_manager: InputManager,
 root: Root,
 config: Config,
@@ -163,6 +165,8 @@ pub fn init(server: *Server, runtime_xwayland: bool) !void {
 
         .tearing_control_manager = try wlr.TearingControlManagerV1.create(wl_server, 1),
 
+        .alpha_modifier = try wlr.AlphaModifierV1.create(wl_server),
+
         .config = try Config.init(),
 
         .root = undefined,
@@ -321,7 +325,8 @@ fn allowlist(server: *Server, global: *const wl.Global) bool {
         global == server.input_manager.tablet_manager.global or
         global == server.input_manager.pointer_gestures.global or
         global == server.idle_inhibit_manager.wlr_manager.global or
-        global == server.tearing_control_manager.global;
+        global == server.tearing_control_manager.global or
+        global == server.alpha_modifier.global;
 }
 
 /// Returns true if the global is blocked for security contexts