Reduce poked cloud verx size

shader/pull/cloud.vert

@@ -1,5 +1,7 @@
 #version 450 core
-struct CloudPosCol { vec4 pos; vec4 col; };
+//struct CloudPosCol { vec4 pos; vec4 col; };
+//struct CloudPosCol { vec3 pos; uint colx; vec4 col; };
+struct CloudPosCol { vec3 pos; uint colx; };
 layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
 layout (std430, binding = 6) readonly buffer CPos { CloudPosCol data[]; };
 const vec2 indices[6] = 
@@ -17,7 +19,8 @@ void main()
 {
     uint i = gl_VertexID / 6;
     uint k = gl_VertexID % 6;
-    vCol = data[i].col;
+    //vCol = data[i].col;
+    vCol = unpackUnorm4x8(data[i].colx);
     vControls = indices[k];
     vPos = vec3(data[i].pos.xy + 20*vControls, data[i].pos.z);
     gl_Position = theMat * vec4(vPos,1);