notification changes

assets/shaders/opacitymask.frag

@@ -0,0 +1,19 @@
+#version 440
+
+layout(location = 0) in vec2 qt_TexCoord0;
+layout(location = 0) out vec4 fragColor;
+
+layout(std140, binding = 0) uniform buf {
+  // qt_Matrix and qt_Opacity must always be both present
+  // if the built-in vertex shader is used.
+  mat4 qt_Matrix;
+  float qt_Opacity;
+};
+
+layout(binding = 1) uniform sampler2D source;
+layout(binding = 2) uniform sampler2D maskSource;
+
+void main() {
+  fragColor = texture(source, qt_TexCoord0.st) *
+              (texture(maskSource, qt_TexCoord0.st).a) * qt_Opacity;
+}