Draw walls using perspective divide

shader/wall.vert

@@ -0,0 +1,18 @@
+#version 430 core
+layout (location = 0) in vec3 pos;
+layout (location = 1) in vec4 params;
+
+out vec4 vParams;
+uniform mat4 worldMat;
+
+mat4 perspective =  
+    mat4 (1,0,0,0
+         ,0,1,0,0
+         ,0,0,1,1
+         ,0,0,0,1
+         ) ;
+void main()
+{
+  gl_Position = perspective * worldMat * vec4(pos.xyz, 1);
+  vParams = params;
+}