feat(renderer2d): added a simple draw order to the Renderer2D which can be defined by the draw_index in the Render2D component

crates/comet_ecs/src/component.rs

@@ -46,6 +46,7 @@ pub struct Render2D {
     is_visible: bool,
     texture_name: &'static str,
     scale: v2,
+    draw_index: u32,
 }
 
 #[derive(Component)]
@@ -62,6 +63,7 @@ pub struct Text {
     font_size: f32,
     color: Color,
     is_visible: bool,
+    bounds: v2,
 }
 
 #[derive(Component)]
@@ -274,11 +276,21 @@ impl Collider for Rectangle2D {
 }
 
 impl Render2D {
+    pub fn new(texture: &'static str, is_visible: bool, scale: v2, draw_index: u32) -> Self {
+        Self {
+            is_visible,
+            texture_name: texture,
+            scale,
+            draw_index,
+        }
+    }
+
     pub fn with_texture(texture: &'static str) -> Self {
         Self {
             is_visible: true,
             texture_name: texture,
             scale: v2::new(1.0, 1.0),
+            draw_index: 0,
         }
     }
 
@@ -289,6 +301,14 @@ impl Render2D {
     pub fn set_scale(&mut self, scale: v2) {
         self.scale = scale;
     }
+
+    pub fn draw_index(&self) -> u32 {
+        self.draw_index
+    }
+
+    pub fn set_draw_index(&mut self, index: u32) {
+        self.draw_index = index
+    }
 }
 
 impl Render for Render2D {
@@ -449,6 +469,7 @@ impl Text {
             font_size,
             color: Color::from_wgpu_color(color.to_wgpu()),
             is_visible,
+            bounds: v2::ZERO,
         }
     }
 

crates/comet_renderer/src/renderer2d.rs

@@ -686,7 +686,15 @@ impl<'a> Renderer2D<'a> {
             return;
         }
 
-        let entities = scene.get_entities_with(vec![Transform2D::type_id(), Render2D::type_id()]);
+        let mut entities =
+            scene.get_entities_with(vec![Transform2D::type_id(), Render2D::type_id()]);
+
+        entities.sort_by(|&a, &b| {
+            let ra = scene.get_component::<Render2D>(a).unwrap();
+            let rb = scene.get_component::<Render2D>(b).unwrap();
+            ra.draw_index().cmp(&rb.draw_index())
+        });
+
         let texts =
             scene.get_entities_with(vec![Transform2D::type_id(), comet_ecs::Text::type_id()]);
 
@@ -713,8 +721,9 @@ impl<'a> Renderer2D<'a> {
                 let region = t_region.unwrap();
                 let (dim_x, dim_y) = region.dimensions();
 
-                let half_width = dim_x as f32 * 0.5;
-                let half_height = dim_y as f32 * 0.5;
+                let scale = renderer_component.scale();
+                let half_width = dim_x as f32 * 0.5 * scale.x();
+                let half_height = dim_y as f32 * 0.5 * scale.y();
 
                 let buffer_size = vertex_buffer.len() as u16;