ENH: Dynamically enable and color tilings

Use multidraw and command buffer

vis/shaders/solid.fs.glsl

@@ -1,8 +1,7 @@
 #version 430
 
-layout(location=2) uniform vec3 col;
-
 layout(location=0) in vec3 pos;
+layout(location=1) in vec3 col;
 layout(location=2) in vec3 normal;
 
 out vec4 color;