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, 11 insertions, 0 deletions

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);
+}