RenderPass: hold on to both colour and depth attachments, not current…

…ly used but at least this way its consistent

src/texture.rs

@@ -342,17 +342,24 @@ pub async fn load_texture(path: &str) -> Result<Texture2D, Error> {
 
 #[derive(Debug, Clone)]
 pub struct RenderPass {
-    render_texture: Texture2D,
+    color_texture: Texture2D,
+    depth_texture: Option<Texture2D>,
     render_pass: Arc<miniquad::RenderPass>,
 }
 
 impl RenderPass {
-    pub fn new(render_texture: Texture2D, render_pass: miniquad::RenderPass) -> RenderPass {
+    fn new(color_texture: Texture2D, depth_texture: Option<Texture2D>) -> RenderPass {
+        let render_pass = get_quad_context().new_render_pass(
+            color_texture.raw_miniquad_id(),
+            depth_texture.as_ref().map(|t| t.raw_miniquad_id()),
+        );
         RenderPass {
-            render_texture,
+            color_texture,
+            depth_texture: depth_texture.map(|t| t.clone()),
             render_pass: Arc::new(render_pass),
         }
     }
+    /// Returns the miniquad handle for this render pass.
     pub fn raw_miniquad_id(&self) -> miniquad::RenderPass {
         *self.render_pass
     }
@@ -373,6 +380,10 @@ pub struct RenderTarget {
     pub render_pass: RenderPass,
 }
 
+fn render_pass(color_texture: Texture2D, depth_texture: Option<Texture2D>) -> RenderPass {
+    RenderPass::new(color_texture, depth_texture)
+}
+
 pub fn render_target(width: u32, height: u32) -> RenderTarget {
     let context = get_context();
 
@@ -386,10 +397,7 @@ pub fn render_target(width: u32, height: u32) -> RenderTarget {
         texture: context.textures.store_texture(texture_id),
     };
 
-    let render_pass = RenderPass::new(
-        texture.clone(),
-        get_quad_context().new_render_pass(texture_id, None),
-    );
+    let render_pass = render_pass(texture.clone(), None);
 
     RenderTarget {
         texture,