From 1e682ede22d722c60bab739102fce8d80af89f35 Mon Sep 17 00:00:00 2001
From: Hilmar Wiegand <me@hwgnd.de>
Date: Tue, 25 Jun 2019 15:22:29 +0200
Subject: [PATCH] Add sprite sorting and transparency

---
 src/main.rs   | 10 +++++++++-
 src/render.rs |  5 +++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 27bac37..81d8daf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,7 +2,10 @@ use amethyst::{
     assets::Processor,
     core::transform::TransformBundle,
     prelude::*,
-    renderer::{types::DefaultBackend, RenderingSystem, SpriteSheet},
+    renderer::{
+        sprite_visibility::SpriteVisibilitySortingSystem, types::DefaultBackend, RenderingSystem,
+        SpriteSheet,
+    },
     utils::application_root_dir,
     window::WindowBundle,
 };
@@ -24,6 +27,11 @@ fn main() -> amethyst::Result<()> {
     let game_data = GameDataBuilder::default()
         .with_bundle(WindowBundle::from_config_path(display_config))?
         .with_bundle(TransformBundle::new())?
+        .with(
+            SpriteVisibilitySortingSystem::new(),
+            "sprite_visibility_system",
+            &["transform_system"],
+        )
         .with(
             Processor::<SpriteSheet>::new(),
             "sprite_sheet_processor",
diff --git a/src/render.rs b/src/render.rs
index 032445b..ed0f89a 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -1,7 +1,7 @@
 use amethyst::{
     ecs::prelude::{ReadExpect, Resources, SystemData},
     renderer::{
-        pass::DrawFlat2DDesc,
+        pass::DrawFlat2DTransparentDesc,
         rendy::{
             factory::Factory,
             graph::{
@@ -75,7 +75,8 @@ impl GraphCreator<DefaultBackend> for RenderGraph {
         // Add additional draw groups here for things like UI
         let pass = builder.add_node(
             SubpassBuilder::new()
-                .with_group(DrawFlat2DDesc::new().builder()) // Draw sprites
+                // Draw sprites with transparency
+                .with_group(DrawFlat2DTransparentDesc::new().builder())
                 .with_color(color)
                 .with_depth_stencil(depth)
                 .into_pass(),