9p: use cloud9 protocol sessions and transports

1 files changed, 6 insertions, 0 deletions

diff --git a/shaders/image.frag.glsl b/shaders/image.frag.glsl
index 2a3c2038..0cc1b2ee 100644
--- a/shaders/image.frag.glsl
+++ b/shaders/image.frag.glsl
@@ -1,6 +1,9 @@
 #version 450
 
 layout(set = 2, binding = 0) uniform sampler2D u_image;
+layout(std140, set = 3, binding = 0) uniform UiUniforms {
+    float background_opacity;
+} u_ui;
 
 layout(location = 0) in vec2 v_uv;
 layout(location = 1) in vec2 v_panel_uv;
@@ -19,6 +22,9 @@ float cellNoise(uint serial, uint col, uint row) {
 
 void main() {
     vec4 source = texture(u_image, v_uv);
+    // Keep source coverage for destination subtraction; the pipeline scales
+    // source alpha by the same opacity through its alpha blend constant.
+    source.rgb *= clamp(u_ui.background_opacity, 0.0, 1.0);
     uint effect = v_effect.x & 0x7fffffffu;
     bool oldLayer = (v_effect.x & 0x80000000u) != 0u;
     float progress = clamp(uintBitsToFloat(v_effect.y), 0.0, 1.0);