Rmove overlay framebuffer, directly draw overlay instead

shader/compute/shadow.comp

@@ -1,5 +1,5 @@
 #version 450 core
-layout(local_size_x= 16, local_size_y=1) in;
+layout(local_size_x= 20, local_size_y=1) in;
 layout(rgba8, binding = 5) uniform restrict writeonly image2D img_output;
 layout (std140, binding = 1) uniform LightsBlock
 {
@@ -13,7 +13,7 @@ void main ()
     shared vec3[20] larray;
     uint i = gl_LocalInvocationID.x;
     vec3 lightamount = vec3(0,0,0);
-    ivec2 pixel_coords = ivec2(gl_GlobalInvocationID.xy);
+    ivec2 pixel_coords = ivec2(gl_WorkGroupID.xy);
     vec2 tex_coords = vec2((4*pixel_coords.x+4)/800.0, (4*pixel_coords.y+4)/835.0);
     vec3 pos = texture(posTexture,tex_coords).xyz;
     vec3 lightPos = posBool[i].xyz;
@@ -26,15 +26,15 @@ void main ()
         float x = 1 - dist / lumRad.a;
         vec3 norm = texture(normals,tex_coords).xyz;
         float y1 = dot(normalize(norm), normalize(distVec));
-        float y = float(y1 > 0 ? 1 : 0);
+        float y = float(y1 > 0 ? 0 : 1);
         lightamount = y*x*lumRad.rgb;
 
     }
       larray[i] = lightamount;
     if (i == 0)
-        //{   vec3 inverselight = 1 - lightamount;
-        {   vec3 inverselight = vec3(0,0,0);
-//            for (uint j=1 ; j < 20; ++j) {inverselight = inverselight * (1 - larray[j]);}
+        {   vec3 inverselight = 1 - lightamount;
+        //{   vec3 inverselight = vec3(0,0,0);
+            for (uint j=1 ; j < 20; ++j) {inverselight = inverselight * (1 - larray[j]);}
             imageStore(img_output, pixel_coords, vec4(inverselight,1));
         }
 }