Bug 1883932 - Add R16 support to texture upload pool a=RyanVM

Original Revision: https://phabricator.services.mozilla.com/D203973

Differential Revision: https://phabricator.services.mozilla.com/D206555

gfx/wr/webrender/src/renderer/upload.rs

@@ -43,6 +43,7 @@ use crate::profiler;
 use crate::render_api::MemoryReport;
 
 pub const BATCH_UPLOAD_TEXTURE_SIZE: DeviceIntSize = DeviceIntSize::new(512, 512);
+const BATCH_UPLOAD_FORMAT_COUNT: usize = 4;
 
 /// Upload a number of items to texture cache textures.
 ///
@@ -627,10 +628,10 @@ pub struct UploadTexturePool {
     /// The textures in the pool associated with a last used frame index.
     ///
     /// The outer array corresponds to each of teh three supported texture formats.
-    textures: [VecDeque<(Texture, u64)>; 3],
+    textures: [VecDeque<(Texture, u64)>; BATCH_UPLOAD_FORMAT_COUNT],
     // Frame at which to deallocate some textures if there are too many in the pool,
     // for each format.
-    delay_texture_deallocation: [u64; 3],
+    delay_texture_deallocation: [u64; BATCH_UPLOAD_FORMAT_COUNT],
     current_frame: u64,
 
     /// Temporary buffers that are used when using staging uploads + glTexImage2D.
@@ -646,8 +647,8 @@ pub struct UploadTexturePool {
 impl UploadTexturePool {
     pub fn new() -> Self {
         UploadTexturePool {
-            textures: [VecDeque::new(), VecDeque::new(), VecDeque::new()],
-            delay_texture_deallocation: [0; 3],
+            textures: [VecDeque::new(), VecDeque::new(), VecDeque::new(), VecDeque::new()],
+            delay_texture_deallocation: [0; BATCH_UPLOAD_FORMAT_COUNT],
             current_frame: 0,
             temporary_buffers: Vec::new(),
             min_temporary_buffers: 0,
@@ -660,6 +661,7 @@ impl UploadTexturePool {
             ImageFormat::RGBA8 => 0,
             ImageFormat::BGRA8 => 1,
             ImageFormat::R8 => 2,
+            ImageFormat::R16 => 3,
             _ => { panic!("unexpected format"); }
         }
     }