Add ancillary data mechanism to send fds to compositor.

Currently we are just attaching the fds to the object id.
In theory this is not a valid implementation, since if we
have more than MAX_FD file descriptors this will not work.
But since this wont be the case in basically all cases of
the wayland protocol, we can just ignore that for now.

1 files changed, 20 insertions, 5 deletions

diff --git a/src/wl/shm/root.zig b/src/wl/shm/root.zig
index 2d24aca..fd96727 100644
--- a/src/wl/shm/root.zig
+++ b/src/wl/shm/root.zig
@@ -4,12 +4,13 @@ const wl = wayland.wl;
 
 pub const Pool = @import("pool.zig");
 pub const Format = @import("format.zig").Format;
+pub const AnonymousFile = @import("anonymous-file.zig");
 
 const Self = @This();
 
 pub const Events = wayland.EventSet(Self, .{ announce_format });
-pub const Requests = union(enum) {
-    create_pool: struct { u32, wayland.types.Fd, u32 },
+pub const Request = union(enum) {
+    create_pool: struct { wayland.Object.Ref, wayland.types.Fd, u32 },
 };
 
 pub var instances: std.ArrayListUnmanaged(*Self) = .empty;
@@ -19,7 +20,7 @@ formats: std.EnumSet(Format) = .initEmpty(),
 
 pub fn init(
     self: *Self,
-    ctx: *wayland.Context,
+    ctx: *const wayland.Context,
 ) !void {
     self.* = .{
         .handle = try ctx.display.registry.add_object(
@@ -29,7 +30,7 @@ pub fn init(
     };
 }
 
-fn announce_format(self: * Self, ctx: *wayland.Context, fmt: Format) void {
+fn announce_format(self: * Self, ctx: *const wayland.Context, fmt: Format) void {
     _ = ctx;
     self.formats.insert(fmt);
 }
@@ -40,7 +41,7 @@ pub const handler: wl.Registry.GlobalHandler = .{
     .handler = register,
 };
 
-fn register(ctx: *wayland.Context) ?wayland.Object.Ref {
+fn register(ctx: *const wayland.Context) ?wayland.Object.Ref {
     const shm = ctx.allocator.create(Self) catch return null;
     shm.init(ctx) catch return null;
 
@@ -48,6 +49,20 @@ fn register(ctx: *wayland.Context) ?wayland.Object.Ref {
     return shm.handle;
 }
 
+pub fn create_pool(self: *Self, ctx: *const wayland.Context, size: usize) !*Pool {
+    const pool = try ctx.allocator.create(Pool);
+    errdefer ctx.allocator.destroy(pool);
+    try pool.init(ctx, size);
+
+    try ctx.display.request(self, .{ .create_pool = .{
+        pool.handle,
+        .{ .fd = pool.file.fd },
+        @truncate(size)
+    } });
+
+    return pool;
+}
+
 pub fn format(
     self: *const Self,
     comptime fmt: []const u8,