having issues with blending...

src/main.rs

@@ -72,6 +72,7 @@ fn render() -> Workload {
   (
     clear_background,
     draw_world,
+    render_selection_box,
   ).into_sequential_workload()
 }
 fn after_frame_end() -> Workload {

src/player.rs

@@ -1,4 +1,3 @@
-use glam::Mat4;
 use shipyard::{Component, AllStoragesViewMut};
 use crate::{
   transform::Transform,

src/rendering/primitives.rs

@@ -1,16 +1,16 @@
-const CUBE_VERTICES: &[f32] = &[
+pub const CUBE_VERTICES: &[f32] = &[
   // front
-  -1.0, -1.0,  1.0,
-   1.0, -1.0,  1.0,
-   1.0,  1.0,  1.0,
-  -1.0,  1.0,  1.0,
+  0.0, 0.0, 1.0,
+  1.0, 0.0, 1.0,
+  1.0, 1.0, 1.0,
+  0.0, 1.0, 1.0,
   // back
-  -1.0, -1.0, -1.0,
-   1.0, -1.0, -1.0,
-   1.0,  1.0, -1.0,
-  -1.0,  1.0, -1.0
+  0.0, 0.0, 0.0,
+  1.0, 0.0, 0.0,
+  1.0, 1.0, 0.0,
+  0.0, 1.0, 0.0
 ];
-const CUBE_INDICES: &[u16] = &[
+pub const CUBE_INDICES: &[u16] = &[
   // front
   0, 1, 2,
   2, 3, 0,

src/rendering/selection_box.rs

@@ -1,35 +1,76 @@
-use shipyard::{View, IntoIter, NonSendSync, UniqueViewMut};
-use glium::{Surface, implement_vertex};
+use shipyard::{View, IntoIter, NonSendSync, UniqueViewMut, UniqueView};
+use glium::{Surface, implement_vertex, IndexBuffer, index::PrimitiveType, VertexBuffer, uniform, DrawParameters, Blend, BackfaceCullingMode};
 use crate::{
   world::raycast::LookingAtBlock, 
-  camera::Camera
+  camera::Camera, prefabs::SelBoxShaderPrefab
+};
+use super::{
+  RenderTarget, 
+  primitives::{CUBE_INDICES, CUBE_VERTICES}, Renderer
 };
-use super::RenderTarget;
 
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, Default)]
 pub struct SelBoxVertex {
   pub position: [f32; 3],
 }
 implement_vertex!(SelBoxVertex, position);
 
+const fn box_vertices() -> [SelBoxVertex; CUBE_VERTICES.len() / 3] {
+  let mut arr = [SelBoxVertex { position: [0., 0., 0.] }; CUBE_VERTICES.len() / 3];
+  let mut ptr = 0;
+  loop {
+    arr[ptr] = SelBoxVertex {
+      position: [
+        CUBE_VERTICES[ptr * 3], 
+        CUBE_VERTICES[(ptr * 3) + 1], 
+        CUBE_VERTICES[(ptr * 3) + 2]
+      ]
+    };
+    ptr += 1;
+    if ptr >= CUBE_VERTICES.len() / 3 {
+      return arr
+    }
+  }
+}
+const BOX_VERTICES: &[SelBoxVertex] = &box_vertices();
+
 //wip
 pub fn render_selection_box(
   lookat: View<LookingAtBlock>,
   camera: View<Camera>,
   mut target: NonSendSync<UniqueViewMut<RenderTarget>>, 
+  display: NonSendSync<UniqueView<Renderer>>,
+  program: NonSendSync<UniqueView<SelBoxShaderPrefab>>,
 ) {
-  for lookat in lookat.iter() {
-    // target.0.draw(
-    //   &mesh.vertex_buffer,
-    //   &mesh.index_buffer,
-    //   &program.0,
-    //   &uniform! {
-    //     position_offset: world_position.to_array(),
-    //     view: view,
-    //     perspective: perspective,
-    //     tex: texture_sampler,
-    //   },
-    //   &draw_parameters
-    // ).unwrap();
-  }
+  let camera = camera.iter().next().unwrap();
+  let Some(lookat) = lookat.iter().next() else { return };
+  let Some(lookat) = lookat.0 else { return };
+
+  //this may be slow but the amount of vertices is very low
+  let vert = VertexBuffer::new(
+    &display.display,
+    BOX_VERTICES
+  ).unwrap();
+  let index = IndexBuffer::new(
+    &display.display,
+    PrimitiveType::TrianglesList, 
+    CUBE_INDICES
+  ).unwrap();
+
+  target.0.draw(
+    &vert,
+    &index,
+    &program.0,
+    &uniform! {
+      color: [0., 0., 0., 0.5_f32],
+      u_position: lookat.block_position.as_vec3().to_array(),
+      perspective: camera.perspective_matrix.to_cols_array_2d(),
+      view: camera.view_matrix.to_cols_array_2d(),
+    },
+    &DrawParameters {
+      blend: Blend::alpha_blending(),
+      backface_culling: BackfaceCullingMode::CullClockwise,
+      ..Default::default()
+    }
+  ).unwrap();
 }