Replace explicit matrix uniforms with single ubo

shader/wall/texture.geom

@@ -1,13 +1,10 @@
 #version 430 core
 layout (points) in;
 layout (triangle_strip, max_vertices = 4) out;
-
+layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
 in vec4 vColor [];
 out vec4 gColor;
 out vec2 tPos;
-
-uniform mat4 worldMat;
-
 // consider using isLHS to check if the wall is facing the center
 float isLHS (vec2 startV, vec2 testV)
 {
@@ -23,10 +20,10 @@ vec4 p2 = vec4 (gl_in[0].gl_Position.zw,0,1);
 vec4 p3 = vec4 (p1.xy,-0.3,1);
 vec4 p4 = vec4 (p2.xy,-0.3,1);
 
-vec4 a1 = worldMat * p1;
-vec4 a2 = worldMat * p2;
-vec4 a3 = worldMat * p3;
-vec4 a4 = worldMat * p4;
+vec4 a1 = theMat * p1;
+vec4 a2 = theMat * p2;
+vec4 a3 = theMat * p3;
+vec4 a4 = theMat * p4;
 
   tPos = vec2 ( 1,-1) ; gl_Position = a1; EmitVertex();
   tPos = vec2 ( 1, 1) ; gl_Position = a3; EmitVertex();