1 files changed, 35 insertions, 1 deletions

diff --git a/src/detached/server.zig b/src/detached/server.zig
index 13cf4488..99a2afc2 100644
--- a/src/detached/server.zig
+++ b/src/detached/server.zig
@@ -11,6 +11,7 @@ const host_io = @import("../host_io.zig");
 const selection_pipe = @import("../selection_pipe.zig");
 
 const file_watch = @import("../file_watch.zig");
+const shader_build = @import("../shader_build.zig");
 
 const ninep_io = @import("../9p_io.zig");
 
@@ -63,6 +64,8 @@ const Client = struct {
     mirror: std.ArrayListUnmanaged(pardes.Cell) = .empty,
     need_full: bool = true,
     accepted_ms: i64 = 0,
+    /// The post chain last sent (Session.sendPost); null: none yet.
+    post_sent: ?u64 = null,
 };
 
 const Pty = struct {
@@ -173,6 +176,8 @@ pub const Session = struct {
     /// the next poll returns at once, to draw it.
     ninep_wake: std.atomic.Value(bool) = .init(false),
     watches: file_watch.Table = @splat(null),
+    /// The post chain's files, compiled here for the GUIs attached.
+    shaders: shader_build = .{},
     check_files: bool = false,
     in_loop: bool = false,
     greet_deadline_ms: u32 = greet_deadline_default_ms,
@@ -254,6 +259,8 @@ pub const Session = struct {
         for (0..pardes.MAX_PANES) |pane|
             file_watch.watchPane(s.inotify_fd, &s.watches, @intCast(pane), null, 0, .{ .text = 0 });
         _ = file_watch.applyThemeEffect(s.core, s.gpa, s.inotify_fd, &s.watches, 0, false, false);
+        // The new core's chain generations are its own.
+        s.shaders.generation = null;
         s.check_files = false;
         if (s.ninep) |listener| listener.reset(replacement);
         s.ninep_pending = false;
@@ -267,6 +274,8 @@ pub const Session = struct {
     }
 
     pub fn deinit(s: *Session) void {
+        // First: its compile thread wakes the mailbox, closed below.
+        s.shaders.deinit(s.gpa, s.inotify_fd, &s.watches);
         if (s.mailbox.wake[0] >= 0) pardes.lsp.setStatusSink(null, null);
         if (s.mailbox.wake[0] >= 0) host_io.setExitWake(null, null);
         s.cancelWorkers();
@@ -766,6 +775,7 @@ pub const Session = struct {
     fn reloadWatched(s: *Session) void {
         if (!s.check_files) return;
         s.check_files = false;
+        s.shaders.recheck();
         for (0..reload_retries) |_| {
             if (!file_watch.reloadChanged(s.core, s.io, s.gpa, &s.watches)) return;
         }
@@ -823,6 +833,8 @@ pub const Session = struct {
         const completed = s.ninep_wake.swap(false, .acq_rel) or drained;
         for (&s.clients) |*c| if (c.fd >= 0) s.flush(c);
         const regridded = s.reconcile();
+        // After the greeting reconcile sends: a chain before it is refused.
+        const compiled = s.sendPost();
         // Nobody attached, nobody to dismiss a message: the loop expires
         // them itself, between the editor's steps (expireUnattended).
         s.core.unattended = s.primary() == null;
@@ -891,7 +903,7 @@ pub const Session = struct {
         }
         var timeout: c_int = if (timeout_ms == 0) -1 else @intCast(@min(timeout_ms, std.math.maxInt(c_int)));
         if (s.nextWake(now)) |due| timeout = if (timeout < 0) due else @min(timeout, due);
-        if (completed or s.check_files or regridded or s.ninep_pending) timeout = 0;
+        if (completed or compiled or s.check_files or regridded or s.ninep_pending) timeout = 0;
         pardes.turn.rest();
         const ready = libc.poll(&fds, @intCast(n), timeout);
         pardes.turn.wake();
@@ -1102,6 +1114,28 @@ pub const Session = struct {
         return regridded;
     }
 
+    /// Compiles the post chain's files (a finished compile wakes the loop
+    /// through the mailbox) and sends each attached frontend the chain it
+    /// has not seen: on attach, and when it or a file's SPIR-V changes. True
+    /// when a compile was taken in, so the loop draws what it said.
+    /// ponytail: a terminal frontend is sent it too and drops it; a hello
+    /// saying which frontend it is would spare those bytes.
+    fn sendPost(s: *Session) bool {
+        const files = for (s.core.settings.post.list()) |entry| {
+            if (entry.scene == null) break true;
+        } else false;
+        const compiled = s.shaders.sync(s.gpa, s.io, s.core, if (files) s.inotify() else s.inotify_fd, &s.watches, .{ .ctx = &s.mailbox, .call = wakeForExit });
+        const key = @as(u64, s.shaders.revision) << 8 | @intFromEnum(s.core.settings.shader_animation);
+        var chain: wire.Post = .{ .animation = s.core.settings.shader_animation, .len = s.core.settings.post.len };
+        _ = s.shaders.view(&s.core.settings.post, &chain.passes);
+        for (&s.clients) |*c| {
+            if (!c.attached or c.greet or c.post_sent == key) continue;
+            c.post_sent = key;
+            s.send(c, .{ .post = chain });
+        }
+        return compiled;
+    }
+
     fn send(s: *Session, c: *Client, msg: wire.ServerMsg) void {
         const want = wire.serverBound(msg);
         s.scratch.ensureTotalCapacity(s.gpa, want) catch return s.close(c, .oom);