move debug systems to CoreStage::PostUpdate so they are drawn the same frame (#11)

Author: CleanCut

src/lib.rs

@@ -5,7 +5,6 @@
 #![allow(dead_code)]
 
 use bevy::prelude::*;
-use bevy::render::RenderStage;
 use bevy::render::{
     mesh::VertexAttributeValues,
     pipeline::{ PrimitiveTopology, PipelineDescriptor, RenderPipeline, PrimitiveState, CullMode  },
@@ -54,8 +53,8 @@ impl Plugin for DebugLinesPlugin {
             .add_asset::<LineShader>()
             .init_resource::<DebugLines>()
             .add_startup_system(setup.system())
-            .add_system_to_stage(CoreStage::Last, draw_lines.system().label("draw_lines"))
-            .add_system_to_stage(CoreStage::Last, asset_shader_defs_system::<LineShader>.system().before("draw_lines"));
+            .add_system_to_stage(CoreStage::PostUpdate, draw_lines.system().label("draw_lines"))
+            .add_system_to_stage(CoreStage::PostUpdate, asset_shader_defs_system::<LineShader>.system().before("draw_lines"));
     }
 }