From e36e946f9a56c4ab1d10cef3aace20fe7d274dfa Mon Sep 17 00:00:00 2001
From: Gabriel Schneider <gbrls@0x4200.cafe>
Date: Sat, 4 Jul 2026 00:57:06 -0300
Subject: 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

---
 build.zig | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'build.zig')

diff --git a/build.zig b/build.zig
index b3ae8e37..8b1b6a3b 100644
--- a/build.zig
+++ b/build.zig
@@ -250,6 +250,8 @@ pub fn build(b: *std.Build) void {
         if (is_emscripten) {
             ui_mod.addAnonymousImport("ui.vert.es.glsl", .{ .root_source_file = b.path("shaders/ui.vert.es.glsl") });
             ui_mod.addAnonymousImport("ui.frag.es.glsl", .{ .root_source_file = b.path("shaders/ui.frag.es.glsl") });
+            ui_mod.addAnonymousImport("overlay.vert.es.glsl", .{ .root_source_file = b.path("shaders/overlay.vert.es.glsl") });
+            ui_mod.addAnonymousImport("overlay.frag.es.glsl", .{ .root_source_file = b.path("shaders/overlay.frag.es.glsl") });
         } else {
             // GLSL -> SPIR-V at build time, embedded into ui_sdl.zig via @embedFile.
             ui_mod.addAnonymousImport("ui.vert.spv", .{
@@ -258,6 +260,12 @@ pub fn build(b: *std.Build) void {
             ui_mod.addAnonymousImport("ui.frag.spv", .{
                 .root_source_file = compileGlsl(b, "shaders/ui.frag.glsl", "fragment", "ui.frag.spv"),
             });
+            ui_mod.addAnonymousImport("overlay.vert.spv", .{
+                .root_source_file = compileGlsl(b, "shaders/overlay.vert.glsl", "vertex", "overlay.vert.spv"),
+            });
+            ui_mod.addAnonymousImport("overlay.frag.spv", .{
+                .root_source_file = compileGlsl(b, "shaders/overlay.frag.glsl", "fragment", "overlay.frag.spv"),
+            });
         }
     }
 
@@ -431,6 +439,7 @@ pub fn build(b: *std.Build) void {
             \\      image-rendering: crisp-edges; image-rendering: pixelated;
             \\      -ms-interpolation-mode: nearest-neighbor;
             \\      transform: translateZ(0); backface-visibility: hidden; }
+            \\      touch-action: none; }
             \\  </style>
             \\</head>
             \\<body>
-- 
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