9p: use cloud9 protocol sessions and transports

1 files changed, 16 insertions, 9 deletions

diff --git a/shaders/ui.frag.glsl b/shaders/ui.frag.glsl
index 69cb63b9..3c366602 100644
--- a/shaders/ui.frag.glsl
+++ b/shaders/ui.frag.glsl
@@ -1,12 +1,16 @@
 #version 450
 
 // Sample the glyph atlas (R = coverage 0..1) and mix the cell's bg up to its fg
-// by that coverage. Output is PREMULTIPLIED: an opaque cell is unchanged, and a
-// cell whose background is the see-through ground (config.gui_transparent, a
-// theme with no bg of its own) contributes only its ink, at the ink's own
-// coverage, so the compositor keeps the rest.
+// by that coverage. Output is PREMULTIPLIED: an opaque cell is unchanged.
+// WindowOpacity changes only the ground's coverage, never the glyph's ink.
+// A cell whose background is the see-through ground (config.gui_transparent,
+// a theme with no bg of its own) still contributes only its ink, at the ink's
+// own coverage, so the compositor keeps the rest.
 
 layout(set = 2, binding = 0) uniform sampler2D u_atlas;
+layout(std140, set = 3, binding = 0) uniform UiUniforms {
+    float background_opacity;
+} u_ui;
 
 layout(location = 0) in vec2 v_uv;
 layout(location = 1) in vec3 v_fg;
@@ -29,11 +33,14 @@ float cellNoise(uint serial, uint col, uint row) {
 void main() {
     float a = texture(u_atlas, v_uv).r;
     bool oldLayer = (v_effect.x & 0x80000000u) != 0u;
-    // 0 where the cell's background IS the ground and the ground is nothing.
-    // src/gui/gui.zig sets that bit; the two flags above it are why the effect
-    // id is masked with 0x3fffffff here and in ui.vert.glsl.
-    float bgA = (v_effect.x & 0x40000000u) != 0u ? 0.0 : 1.0;
-    uint effect = v_effect.x & 0x3fffffffu;
+    // A block cursor is foreground chrome even though its fill occupies the
+    // cell background: keep it visible at WindowOpacity 0. Otherwise a clear
+    // theme ground has no coverage and ordinary backgrounds use the setting.
+    // The three high flags are shared with ui.vert.glsl and src/gui/gui.zig.
+    float bgA = (v_effect.x & 0x20000000u) != 0u ? 1.0
+        : (v_effect.x & 0x40000000u) != 0u ? 0.0
+        : clamp(u_ui.background_opacity, 0.0, 1.0);
+    uint effect = v_effect.x & 0x1fffffffu;
     float progress = clamp(uintBitsToFloat(v_effect.y), 0.0, 1.0);
     uint cellCol = v_effect.w & 0xffffu;
     uint cellRow = v_effect.w >> 16;