Make query pool size an associated constant

piet-gpu/bin/android.rs

@@ -110,7 +110,7 @@ impl GfxState {
                 .map(|_| session.create_semaphore())
                 .collect::<Result<Vec<_>, Error>>()?;
             let query_pools = (0..NUM_FRAMES)
-                .map(|_| session.create_query_pool(12))
+                .map(|_| session.create_query_pool(Renderer::QUERY_POOL_SIZE))
                 .collect::<Result<Vec<_>, Error>>()?;
             let submitted = Default::default();
             let cmd_bufs = Default::default();

piet-gpu/bin/winit.rs

@@ -70,7 +70,7 @@ fn main() -> Result<(), Error> {
             .map(|_| session.create_semaphore())
             .collect::<Result<Vec<_>, Error>>()?;
         let query_pools = (0..NUM_FRAMES)
-            .map(|_| session.create_query_pool(12))
+            .map(|_| session.create_query_pool(Renderer::QUERY_POOL_SIZE))
             .collect::<Result<Vec<_>, Error>>()?;
         let mut cmd_bufs: [Option<CmdBuf>; NUM_FRAMES] = Default::default();
         let mut submitted: [Option<SubmittedCmdBuf>; NUM_FRAMES] = Default::default();

piet-gpu/src/lib.rs

@@ -143,6 +143,9 @@ impl RenderConfig {
 }
 
 impl Renderer {
+    /// The number of query pool entries needed to run the renderer.
+    pub const QUERY_POOL_SIZE: u32 = 12;
+
     pub unsafe fn new(
         session: &Session,
         width: usize,