touch debug overlay: multi-touch circles with trails, finger event handling, 4x larger, fade trails, SDL GPU + WebGL overlay shaders, touch-action:none in HTML, --debug-overlay flag, pinch event dispatch for all SDL backends

1 files changed, 18 insertions, 8 deletions

diff --git a/main.zig b/main.zig
index dbd35f68..b96ea3a5 100644
--- a/main.zig
+++ b/main.zig
@@ -150,6 +150,7 @@ pub const Command = struct {
         winsize: vaxis.Winsize,
         mouse: vaxis.Mouse,
         paste: []const u8, // OSC 52 system-clipboard read reply (the loop decodes it)
+        pinch: f32,
     } = .nop;
 };
 
@@ -176,6 +177,7 @@ const Cli = struct {
     tty_toggle: u21 = default_tty_toggle,
     help: bool = false,
     perf_startup: bool = false,
+    debug_overlay: bool = false,
 };
 
 const help_text =
@@ -185,8 +187,9 @@ const help_text =
     \\  --tty                  start as one shell pane already in tty mode
     \\  --tty-toggle <key>     use Ctrl-<key> to enter/leave tty mode
     \\  --tty-toggle=<key>     same as above; accepts b, Ctrl-b, or ^b
+    \\  --debug-overlay       start with debug overlay visible
     \\  -h, --help             show this help and exit
-    \\
+    \\\;
 ;
 
 fn printHelp(io: std.Io) !void {
@@ -225,6 +228,8 @@ fn parseCli(args: []const [:0]const u8) !Cli {
             i += 1;
             if (i >= args.len) return error.BadArgs;
             cli.tty_toggle = parseCtrlKey(args[i]) orelse return error.BadArgs;
+        } else if (std.mem.eql(u8, a, "--debug-overlay")) {
+            cli.debug_overlay = true;
         } else {
             return error.BadArgs;
         }
@@ -305,6 +310,7 @@ var colors_on: bool = true;
 // The stats overlay, toggled by the "Debug" builtin. Global (like colors_on) so the
 // central command dispatcher can flip it; the render reads it.
 var show_debug: bool = false;
+var ov_pinch_scale: f32 = 1.0;
 
 // Builtins. Executing the name (middle-click / Tab) runs the action through the ONE
 // dispatcher (onSelect + actOnSelection), no matter where the name is shown — a pane
@@ -2804,6 +2810,7 @@ pub fn main(init: std.process.Init) !void {
     const tty_only = cli.tty_only;
     const tty_toggle = cli.tty_toggle;
     const perf_startup = cli.perf_startup;
+    if (cli.debug_overlay) show_debug = true;
 
     var screen_w: u16 = 80;
     var screen_h: u16 = 24;
@@ -2830,7 +2837,7 @@ pub fn main(init: std.process.Init) !void {
     var frame_arena: std.heap.ArenaAllocator = .init(gpa);
     defer frame_arena.deinit();
     defer freeYank(gpa);
-    var ov_buf: [128]u8 = undefined; // overlay text; must outlive each vx.render()
+    var ov_buf: [192]u8 = undefined; // overlay text; must outlive each vx.render()
 
     // system_clipboard_allocator lets the loop's reader thread decode OSC 52 paste
     // replies (delivered as .paste events). gpa is already used cross-thread by the
@@ -3383,6 +3390,9 @@ pub fn main(init: std.process.Init) !void {
                     normalPaste(gpa, t);
                 }
             },
+            .pinch => |scale| {
+                ov_pinch_scale = scale;
+            },
             .quit => break,
             else => {},
         }
@@ -3567,12 +3577,12 @@ pub fn main(init: std.process.Init) !void {
                 sb_total = sb.total;
             }
             const s = std.fmt.bufPrint(
-                &ov_buf,
-                "pardes  resizes={d}\nterms {d}  cols {d}\nactive #{d}  {d}x{d}\nscroll {d}/{d}",
-                .{ resize_count, nlive, layout.ncol, active, at.cols, at.rows, sb_off, sb_total },
-            ) catch "";
-            const ow: u16 = 26;
-            const oh: u16 = 6;
+                            &ov_buf,
+                            "pardes  resizes={d}\nterms {d}  cols {d}\nactive #{d}  {d}x{d}\nscroll {d}/{d}\npinch  {d:6.4}",
+                            .{ resize_count, nlive, layout.ncol, active, at.cols, at.rows, sb_off, sb_total, ov_pinch_scale },
+                        ) catch "";
+                        const ow: u16 = 30;
+                        const oh: u16 = 7;
             const ox: u16 = if (screen_w > ow) screen_w - ow else 0;
             const ov = win.child(.{ .x_off = ox, .y_off = TOPBAR_H, .width = ow, .height = oh, .border = .{ .where = .all } });
             ov.fill(.{ .char = .{ .grapheme = " " }, .style = .{ .bg = .{ .rgb = gray.bar } } });