Shader cleanup

core/assets/shaders/planetgrid.vert

@@ -0,0 +1,14 @@
+attribute vec4 a_position;
+attribute vec4 a_color;
+
+uniform mat4 u_proj;
+uniform mat4 u_trans;
+
+varying vec4 v_col;
+varying vec4 v_position;
+
+void main() {
+    gl_Position = u_proj * u_trans * a_position;
+    v_col = a_color;
+    v_position = a_position;
+}