Initial implementation of WebGLQueries

This patch adds initial support for WeGLQueries. Most related WebGL
functions and objects are implemented [1]. What's still missing is
the `EXT_disjoint_timer_query_webgl2` support.

[1]: https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7.12

1 files changed, 17 insertions, 0 deletions

diff --git a/components/canvas/webgl_thread.rs b/components/canvas/webgl_thread.rs
index c9007515ae4..6fa60d3d7c3 100644
--- a/components/canvas/webgl_thread.rs
+++ b/components/canvas/webgl_thread.rs
@@ -1593,6 +1593,23 @@ impl WebGLImpl {
                 depth,
                 stencil,
             } => Self::initialize_framebuffer(ctx.gl(), state, color, depth, stencil),
+            WebGLCommand::BeginQuery(target, query_id) => {
+                ctx.gl().begin_query(target, query_id.get());
+            },
+            WebGLCommand::EndQuery(target) => {
+                ctx.gl().end_query(target);
+            },
+            WebGLCommand::DeleteQuery(query_id) => {
+                ctx.gl().delete_queries(&[query_id.get()]);
+            },
+            WebGLCommand::GenerateQuery(ref sender) => {
+                let id = ctx.gl().gen_queries(1)[0];
+                sender.send(unsafe { WebGLQueryId::new(id) }).unwrap()
+            },
+            WebGLCommand::GetQueryState(ref sender, query_id, pname) => {
+                let value = ctx.gl().get_query_object_uiv(query_id.get(), pname);
+                sender.send(value).unwrap()
+            },
         }
 
         // TODO: update test expectations in order to enable debug assertions