macos fix

1 files changed, 4 insertions, 3 deletions

diff --git a/shaders/ui.vert.glsl b/shaders/ui.vert.glsl
index 08627dc0..5ec596fe 100644
--- a/shaders/ui.vert.glsl
+++ b/shaders/ui.vert.glsl
@@ -14,8 +14,9 @@ layout(location = 3) in vec3 a_bg;
 layout(location = 4) in vec4 a_panel_rect;
 layout(location = 5) in vec4 a_present_rect;
 // effect id, eased-progress float bits, pane serial, local row/column packed
-// into one uint. The high effect bit marks the frozen-old cell layer; integer
-// transport preserves the exact cross-backend hash.
+// into one uint. The TWO high effect bits are flags — the frozen-old cell
+// layer and a see-through cell background — so the id is what is left below
+// them; integer transport preserves the exact cross-backend hash.
 layout(location = 6) in uvec4 a_effect;
 
 layout(location = 0) out vec2 v_uv;
@@ -54,7 +55,7 @@ void main() {
         v_cell_uv = vec2(0.0, 1.0);
     }
 
-    uint effect = a_effect.x & 0x7fffffffu;
+    uint effect = a_effect.x & 0x3fffffffu;
     if (effect == 1u || effect == 2u || effect == 5u) {
         // NDC y points up, so a top-left/bottom-right box has a NEGATIVE y
         // delta. Preserve that sign or every local y is mirrored/outside.