enable fallback path

third_party/WebKit/Source/platform/graphics/gpu/Extensions3DUtil.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/StringHash.h"
@@ skipping 56 matching lines @@
     m_requestableExtensions.clear();
     initializeExtensions();
   }
   return m_enabledExtensions.contains(name);
 }
 
 bool Extensions3DUtil::isExtensionEnabled(const String& name) {
   return m_enabledExtensions.contains(name);
 }
 
-bool Extensions3DUtil::canUseCopyTextureCHROMIUM(GLenum destTarget,
-                                                 GLenum destFormat,
-                                                 GLenum destType,
-                                                 GLint level) {
-  // TODO(zmo): restriction of (RGB || RGBA)/UNSIGNED_BYTE/(Level 0) should be
-  // lifted when GLES2Interface::CopyTextureCHROMIUM(...) are fully functional.
-  if (destTarget == GL_TEXTURE_2D &&
-      (destFormat == GL_RGB || destFormat == GL_RGBA) &&
-      destType == GL_UNSIGNED_BYTE && !level)
-    return true;
-  return false;
+bool Extensions3DUtil::canUseCopyTextureCHROMIUM(GLenum destTarget) {
+  switch (destTarget) {
+    case GL_TEXTURE_2D:
+    case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
+    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
+    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
+    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
+    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
+    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
+      return true;
+    default:
+      return false;
+  }
 }
 
 }  // namespace blink