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

---
 shaders/overlay.frag.es.glsl | 11 +++++++++++
 shaders/overlay.frag.glsl    |  9 +++++++++
 shaders/overlay.vert.es.glsl | 13 +++++++++++++
 shaders/overlay.vert.glsl    | 11 +++++++++++
 4 files changed, 44 insertions(+)
 create mode 100644 shaders/overlay.frag.es.glsl
 create mode 100644 shaders/overlay.frag.glsl
 create mode 100644 shaders/overlay.vert.es.glsl
 create mode 100644 shaders/overlay.vert.glsl

(limited to 'shaders')

diff --git a/shaders/overlay.frag.es.glsl b/shaders/overlay.frag.es.glsl
new file mode 100644
index 00000000..37032c9a
--- /dev/null
+++ b/shaders/overlay.frag.es.glsl
@@ -0,0 +1,11 @@
+#version 300 es
+
+precision mediump float;
+
+in vec4 v_color;
+
+out vec4 o_col;
+
+void main() {
+    o_col = v_color;
+}
diff --git a/shaders/overlay.frag.glsl b/shaders/overlay.frag.glsl
new file mode 100644
index 00000000..86c0188b
--- /dev/null
+++ b/shaders/overlay.frag.glsl
@@ -0,0 +1,9 @@
+#version 450
+
+layout(location = 0) in vec4 v_color;
+
+layout(location = 0) out vec4 o_col;
+
+void main() {
+    o_col = v_color;
+}
diff --git a/shaders/overlay.vert.es.glsl b/shaders/overlay.vert.es.glsl
new file mode 100644
index 00000000..edea124d
--- /dev/null
+++ b/shaders/overlay.vert.es.glsl
@@ -0,0 +1,13 @@
+#version 300 es
+
+precision mediump float;
+
+layout(location = 0) in vec2 a_pos;
+layout(location = 1) in vec4 a_color;
+
+out vec4 v_color;
+
+void main() {
+    v_color = a_color;
+    gl_Position = vec4(a_pos, 0.0, 1.0);
+}
diff --git a/shaders/overlay.vert.glsl b/shaders/overlay.vert.glsl
new file mode 100644
index 00000000..5f6be593
--- /dev/null
+++ b/shaders/overlay.vert.glsl
@@ -0,0 +1,11 @@
+#version 450
+
+layout(location = 0) in vec2 a_pos;
+layout(location = 1) in vec4 a_color;
+
+layout(location = 0) out vec4 v_color;
+
+void main() {
+    v_color = a_color;
+    gl_Position = vec4(a_pos, 0.0, 1.0);
+}
-- 
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