Take the ambient occlusion into the lighting and add a probe of the cab

shaders/vk14/cabprobe_alpha.frag

@@ -0,0 +1,23 @@
+#version 460 core
+#define STAGE_FRAGMENT 1
+#include "common.glsl"
+// the probe of the occupied cab (gfx::cab_probe), the materials whose colour shader tests the alpha of the diffuse texture against
+// the opacity of the material, with the test of depthprepass_alpha.frag (cabprobe.glsl)
+layout(location = 0) in vec3 f_normal;
+layout(location = 2) in vec2 f_coord;
+layout(location = 3) in vec4 f_pos;
+
+#pragma texture(diffuse, 0, sRGB_A)
+layout(set = MATERIAL_SET, binding = MATERIAL_TEXTURE_FIRST + 0) uniform sampler2D diffuse;
+// the cube shadow map of the cab lamp
+layout(set = PASS_SET, binding = LOCAL_SHADOW_TEX) uniform samplerCubeArrayShadow probe_shadowmap;
+
+#include "cabprobe.glsl"
+
+void main()
+{
+	vec4 tex_color = texture(diffuse, f_coord);
+	if (tex_color.a < opacity + 1.0 / 255.0)
+		discard;
+	probe_shade(tex_color);
+}