Pack shape normals into a word8

shader/shape/basic.frag

@@ -9,5 +9,6 @@ void main()
 {
   fCol = vCol;
   fPos = vPos;
-  fNorm = vec4(vNorm.xyz - vPos.xyz,1);
+  //fNorm = vec4(vNorm.xyz - vPos.xyz,1);
+  fNorm = vNorm ;
 }

shader/shape/basic.vert

@@ -1,5 +1,7 @@
 #version 450 core
-struct PosColNorm { vec4 pos; uint col; vec4 norm; };
+//struct PosColNorm { vec4 pos;   vec4 norm;uint col; uint dummy; };
+struct PosColNorm { vec4 pos;  uint norm;uint d1;uint d2; uint d3;uint col; uint dummy; };
+// I don't know if the dummy is necessary
 layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
 layout (std430, binding = 3) readonly buffer Data { PosColNorm data[]; };
 layout (std430, binding = 4) readonly buffer Indices { uint indices[]; };
@@ -9,7 +11,8 @@ out vec4 vNorm;
 void main() {
   vPos = data[indices[gl_VertexID]].pos;
   vCol = unpackUnorm4x8(data[indices[gl_VertexID]].col);
-  vNorm = data[indices[gl_VertexID]].norm;
+  vec4 n = unpackUnorm4x8(data[indices[gl_VertexID]].norm);
+  vNorm = n *2 - vec4(1,1,1,1);
   gl_Position = theMat * vec4(vPos.xyz,1);
 }
 //layout (location = 0) in vec4 pos;