Bug 1596248 - Add CreateContextFlags::PREFER_MULTITHREADED and change the pref name from gl to webgl. r=jgilbert

Differential Revision: https://phabricator.services.mozilla.com/D53768

--HG--
extra : moz-landing-system : lando

dom/canvas/WebGLContext.cpp

@@ -483,6 +483,10 @@ bool WebGLContext::CreateAndInitGL(
     flags |= gl::CreateContextFlags::FORCE_ENABLE_HARDWARE;
   }
 
+  if (StaticPrefs::webgl_cgl_multithreaded()) {
+    flags |= gl::CreateContextFlags::PREFER_MULTITHREADED;
+  }
+
   if (IsWebGL2()) {
     flags |= gl::CreateContextFlags::PREFER_ES3;
   } else {

gfx/gl/GLContextProviderCGL.mm

@@ -237,7 +237,7 @@ static already_AddRefed<GLContextCGL> CreateOffscreenFBOContext(CreateContextFla
 
   RefPtr<GLContextCGL> glContext = new GLContextCGL(flags, SurfaceCaps::Any(), context, true);
 
-  if (StaticPrefs::gl_multithreaded()) {
+  if (flags & CreateContextFlags::PREFER_MULTITHREADED) {
     CGLEnable(glContext->GetCGLContext(), kCGLCEMPEngine);
   }
   return glContext.forget();

gfx/gl/GLContextTypes.h

@@ -44,6 +44,7 @@ enum class CreateContextFlags : uint16_t {
   HIGH_POWER = 1 << 6,
   PROVOKING_VERTEX_DONT_CARE = 1 << 7,
   PREFER_EXACT_VERSION = 1 << 8,
+  PREFER_MULTITHREADED = 1 << 9,
 };
 MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(CreateContextFlags)
 

modules/libpref/init/StaticPrefList.yaml

@@ -3713,13 +3713,6 @@
   value: false
   mirror: always
 
-#if defined(XP_MACOSX)
--   name: gl.multithreaded
-    type: RelaxedAtomicBool
-    value: true
-    mirror: always
-#endif
-
 - name: gl.use-tls-is-current
   type: RelaxedAtomicInt32
   value: 0
@@ -7582,7 +7575,6 @@
 #endif
   mirror: always
 
-
 - name: webgl.all-angle-options
   type: RelaxedAtomicBool
   value: false
@@ -7612,6 +7604,11 @@
   value: true
   mirror: always
 
+- name: webgl.cgl.multithreaded
+  type: RelaxedAtomicBool
+  value: true
+  mirror: always
+
 - name: webgl.default-antialias
   type: RelaxedAtomicBool
   value: @IS_NOT_ANDROID@