Bug 1691925 - Block webrender on android devices which don't support GL_OES_EGL_image_external_essl3 r=aosmond

Currently webrender requires the extension
GL_OES_EGL_image_external_essl3 to render video. There exist some
older GLES 3 devices which do not support this extension, and
attempting to render video on these devices results in a shader
compilation error and falling back to OpenGL layers.

In bug 1507074 we will implement a long term solution for such
devices, but in the meantime block webrender on devices which do not
support this extension.

Differential Revision: https://phabricator.services.mozilla.com/D104669

widget/android/GfxInfo.cpp

@@ -25,6 +25,7 @@ class GfxInfo::GLStrings {
   nsCString mVendor;
   nsCString mRenderer;
   nsCString mVersion;
+  nsTArray<nsCString> mExtensions;
   bool mReady;
 
  public:
@@ -57,6 +58,11 @@ class GfxInfo::GLStrings {
   // MOZ_GFX_SPOOF_GL_VERSION was set.
   void SpoofVersion(const nsCString& s) { mVersion = s; }
 
+  const nsTArray<nsCString>& Extensions() {
+    EnsureInitialized();
+    return mExtensions;
+  }
+
   void EnsureInitialized() {
     if (mReady) {
       return;
@@ -104,6 +110,15 @@ class GfxInfo::GLStrings {
       }
     }
 
+    if (mExtensions.IsEmpty()) {
+      int numExtensions;
+      gl->fGetIntegerv(LOCAL_GL_NUM_EXTENSIONS, &numExtensions);
+      mExtensions.SetLength(numExtensions);
+      for (int i = 0; i < numExtensions; i++) {
+        mExtensions[i].Assign((const char*)gl->fGetStringi(LOCAL_GL_EXTENSIONS, i));
+      }
+    }
+
     mReady = true;
   }
 };
@@ -605,9 +620,16 @@ nsresult GfxInfo::GetFeatureStatusImpl(
                      gpu.Find("Mali-G76", /*ignoreCase*/ true) == kNotFound &&
                      gpu.Find("Mali-G31", /*ignoreCase*/ true) == kNotFound;
 
+      // Currently webrender requires the extension GL_OES_EGL_image_external_essl3
+      // to render video. Bug 1507074 tracks removing this requirement.
+      bool supportsImageExternalEssl3 = mGLStrings->Extensions().Contains("GL_OES_EGL_image_external_essl3"_ns);
+
       if (!isUnblocked) {
         *aStatus = nsIGfxInfo::FEATURE_BLOCKED_DEVICE;
         aFailureId = "FEATURE_FAILURE_WEBRENDER_BLOCKED_DEVICE";
+      } else if (!supportsImageExternalEssl3) {
+        *aStatus = nsIGfxInfo::FEATURE_BLOCKED_DEVICE;
+        aFailureId = "FEATURE_FAILURE_WEBRENDER_NO_IMAGE_EXTERNAL";
       } else {
         *aStatus = nsIGfxInfo::FEATURE_ALLOW_QUALIFIED;
       }