Add anchor data

examples/ui.rs

@@ -89,6 +89,7 @@ fn setup(world: &mut World) {
         vec![(Rect {
             position: math::vec2(75.0, 75.0),
             dimensions: math::vec2(100.0, 100.0),
+            anchors: Anchors::new(0.5, 0.5, 0.5, 0.5),
             color: math::vec4(0.0, 1.0, 0.0, 1.0),
         },)],
     );
@@ -98,6 +99,7 @@ fn setup(world: &mut World) {
         vec![(Rect {
             position: math::vec2(50.0, 50.0),
             dimensions: math::vec2(100.0, 100.0),
+            anchors: Anchors::new(0.5, 0.5, 0.5, 0.5),
             color: math::vec4(1.0, 0.0, 0.0, 1.0),
         },)],
     );
@@ -107,6 +109,7 @@ fn setup(world: &mut World) {
         vec![(Rect {
             position: math::vec2(100.0, 100.0),
             dimensions: math::vec2(100.0, 100.0),
+            anchors: Anchors::new(0.5, 0.5, 0.5, 0.5),
             color: math::vec4(0.0, 0.0, 1.0, 1.0),
         },)],
     );

src/render/passes/ui/mod.rs

@@ -13,6 +13,7 @@ use zerocopy::{AsBytes, FromBytes};
 pub struct RectData {
     pub position: [f32; 2],
     pub dimensions: [f32; 2],
+    pub anchors: [f32; 4],
     pub color: [f32; 4],
     pub z_index: f32,
 }
@@ -54,6 +55,7 @@ impl UiPipeline {
                 position: rect.position.into(),
                 dimensions: rect.dimensions.into(),
                 color: rect.color.into(),
+                anchors: [rect.anchors.top, rect.anchors.bottom, rect.anchors.left, rect.anchors.right],
                 z_index: z,
             });
 
@@ -152,10 +154,15 @@ impl Pipeline for UiPipeline {
                     shader_location: 4,
                 },
                 wgpu::VertexAttributeDescriptor {
-                    format: wgpu::VertexFormat::Float,
+                    format: wgpu::VertexFormat::Float4,
                     offset: 8 * 4,
                     shader_location: 5,
                 },
+                wgpu::VertexAttributeDescriptor {
+                    format: wgpu::VertexFormat::Float,
+                    offset: 12 * 4,
+                    shader_location: 6,
+                },
             ],
         };
 

src/render/passes/ui/ui.vert

@@ -7,8 +7,9 @@ layout(location = 1) in vec4 a_Normal;
 // instanced attributes (RectData)
 layout (location = 2) in vec2 a_RectPosition;
 layout (location = 3) in vec2 a_RectDimensions;
-layout (location = 4) in vec4 a_RectColor;
-layout (location = 5) in float a_RectZIndex;
+layout (location = 4) in vec4 a_RectAnchors;
+layout (location = 5) in vec4 a_RectColor;
+layout (location = 6) in float a_RectZIndex;
 
 layout(location = 0) out vec4 v_Color;
 

src/render/rect.rs

@@ -1,16 +1,48 @@
 use crate::math::{Vec2, Vec4};
 
+pub struct Anchors {
+    pub top: f32,
+    pub bottom: f32,
+    pub left: f32,
+    pub right: f32,
+
+}
+
+impl Anchors {
+    pub fn new(top: f32, bottom: f32, left: f32, right: f32) -> Self {
+        Anchors {
+            top,
+            bottom,
+            left,
+            right
+        }
+    }
+}
+
+impl Default for Anchors {
+    fn default() -> Self {
+        Anchors {
+            top: 0.5,
+            bottom: 0.5,
+            left: 0.5,
+            right: 0.5
+        }
+    }
+}
+
 pub struct Rect {
     pub position: Vec2,
     pub dimensions: Vec2,
+    pub anchors: Anchors,
     pub color: Vec4,
 }
 
 impl Rect {
-    pub fn new(position: Vec2, dimensions: Vec2, color: Vec4) -> Self {
+    pub fn new(position: Vec2, dimensions: Vec2, anchors: Anchors, color: Vec4) -> Self {
         Rect {
             position,
             dimensions,
+            anchors,
             color,
         }
     }