fix view leak and add view count

src/render/texture.rs

@@ -7,6 +7,7 @@ pub struct GpuTextures {
     device: Device,
     queue: Queue,
     views: Vec<TextureView>,
+    view_count: usize,
     samplers: Vec<Sampler>,
     null_view: TextureView,
     no_views: Vec<TextureView>,
@@ -23,19 +24,19 @@ impl GpuTextures {
                 TextureUpdate::Free(i) => self.free(i),
             }
         }
-        // if changed {
-        //     println!("{}", self.views.len());
-        // }
         changed
     }
     fn set(&mut self, i: u32, image: &DynamicImage) {
+        self.view_count += 1;
         let view = self.create_view(image);
         self.views[i as usize] = view;
     }
     fn free(&mut self, i: u32) {
+        self.view_count -= 1;
         self.views[i as usize] = self.null_view.clone();
     }
     fn push(&mut self, image: &DynamicImage) {
+        self.view_count += 1;
         let view = self.create_view(image);
         self.views.push(view);
     }
@@ -74,6 +75,7 @@ impl GpuTextures {
             samplers: vec![default_sampler(device)],
             no_views: vec![null_view.clone()],
             null_view,
+            view_count: 0,
         }
     }
 
@@ -91,6 +93,10 @@ impl GpuTextures {
     pub fn samplers(&self) -> Vec<&Sampler> {
         self.samplers.iter().by_ref().collect()
     }
+
+    pub fn view_count(&self) -> usize {
+        self.view_count
+    }
 }
 
 pub fn null_texture_view(device: &Device) -> TextureView {