From 2c7456028338301137f124986ce4848845f24451 Mon Sep 17 00:00:00 2001
From: Carter Anderson <mcanders1@gmail.com>
Date: Tue, 23 Jun 2020 19:27:00 -0700
Subject: [PATCH] render: draw in back-to-front mode to be safe (until we can
 do both at the same time). expand texture example

---
 .../src/render_graph/nodes/main_pass_node.rs  |  2 +-
 examples/3d/texture.rs                        | 21 ++++++++++++++++---
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/crates/bevy_render/src/render_graph/nodes/main_pass_node.rs b/crates/bevy_render/src/render_graph/nodes/main_pass_node.rs
index 9e23d8f475..6a438f6c24 100644
--- a/crates/bevy_render/src/render_graph/nodes/main_pass_node.rs
+++ b/crates/bevy_render/src/render_graph/nodes/main_pass_node.rs
@@ -103,7 +103,7 @@ impl Node for MainPassNode {
                     };
 
                     let mut draw_state = DrawState::default();
-                    for visible_entity in visible_entities.iter() {
+                    for visible_entity in visible_entities.iter().rev() {
                         let draw = if let Some(draw) = world.get_component::<Draw>(visible_entity.entity) {
                             draw
                         } else {
diff --git a/examples/3d/texture.rs b/examples/3d/texture.rs
index 19434f1931..5b5a167928 100644
--- a/examples/3d/texture.rs
+++ b/examples/3d/texture.rs
@@ -34,13 +34,20 @@ fn setup(
         ..Default::default()
     });
 
-    // this material modulates the texture to make it red
-    let modulated_material_handle = materials.add(StandardMaterial {
+    // this material modulates the texture to make it red (and slightly transparent)
+    let red_material_handle = materials.add(StandardMaterial {
         albedo: Color::rgba(1.0, 0.0, 0.0, 0.5),
         albedo_texture: Some(texture_handle),
         ..Default::default()
     });
 
+    // and lets make this one blue! (and also slightly transparent)
+    let blue_material_handle = materials.add(StandardMaterial {
+        albedo: Color::rgba(0.0, 0.0, 1.0, 0.5),
+        albedo_texture: Some(texture_handle),
+        ..Default::default()
+    });
+
     // add entities to the world
     command_buffer
         .build()
@@ -48,6 +55,14 @@ fn setup(
         .add_entity(MeshEntity {
             mesh: quad_handle,
             material: material_handle,
+            translation: Translation::new(0.0, -1.5, 0.0),
+            rotation: Rotation::from_euler_angles(0.0, std::f32::consts::PI / 3.0, 0.0),
+            ..Default::default()
+        })
+        // textured quad - modulated
+        .add_entity(MeshEntity {
+            mesh: quad_handle,
+            material: red_material_handle,
             translation: Translation::new(0.0, 0.0, 0.0),
             rotation: Rotation::from_euler_angles(0.0, std::f32::consts::PI / 3.0, 0.0),
             ..Default::default()
@@ -55,7 +70,7 @@ fn setup(
         // textured quad - modulated
         .add_entity(MeshEntity {
             mesh: quad_handle,
-            material: modulated_material_handle,
+            material: blue_material_handle,
             translation: Translation::new(0.0, 1.5, 0.0),
             rotation: Rotation::from_euler_angles(0.0, std::f32::consts::PI / 3.0, 0.0),
             ..Default::default()