command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/feature_info.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 191 matching lines @@
 
   feature_flags_.is_swiftshader =
       (command_line.GetSwitchValueASCII(switches::kUseGL) == "swiftshader");
 
   feature_flags_.enable_subscribe_uniform =
       command_line.HasSwitch(switches::kEnableSubscribeUniformExtension);
 
   enable_unsafe_es3_apis_switch_ =
       command_line.HasSwitch(switches::kEnableUnsafeES3APIs);
 
+  enable_gl_path_rendering_switch_ =
+      command_line.HasSwitch(switches::kEnableGLPathRendering);
+
   unsafe_es3_apis_enabled_ = false;
 }
 
 bool FeatureInfo::Initialize() {
   disallowed_features_ = DisallowedFeatures();
   InitializeFeatures();
   return true;
 }
 
 bool FeatureInfo::Initialize(const DisallowedFeatures& disallowed_features) {
@@ skipping 775 matching lines @@
       if (blend_equation_advanced_coherent)
         AddExtensionString("GL_KHR_blend_equation_advanced_coherent");
 
       AddExtensionString("GL_KHR_blend_equation_advanced");
       feature_flags_.blend_equation_advanced = true;
       feature_flags_.blend_equation_advanced_coherent =
           blend_equation_advanced_coherent;
     }
   }
 
-  if (extensions.Contains("GL_NV_path_rendering")) {
-    if (extensions.Contains("GL_EXT_direct_state_access") ||
-        gl_version_info_->is_es3) {
-      AddExtensionString("GL_CHROMIUM_path_rendering");
-      feature_flags_.chromium_path_rendering = true;
-      validators_.g_l_state.AddValue(GL_PATH_MODELVIEW_MATRIX_CHROMIUM);
-      validators_.g_l_state.AddValue(GL_PATH_PROJECTION_MATRIX_CHROMIUM);
-    }
+  if (enable_gl_path_rendering_switch_ &&
+      !workarounds_.disable_gl_path_rendering &&
+      extensions.Contains("GL_NV_path_rendering") &&
+      (extensions.Contains("GL_EXT_direct_state_access") ||
+       gl_version_info_->is_es3)) {
+    AddExtensionString("GL_CHROMIUM_path_rendering");
+    feature_flags_.chromium_path_rendering = true;
+    validators_.g_l_state.AddValue(GL_PATH_MODELVIEW_MATRIX_CHROMIUM);
+    validators_.g_l_state.AddValue(GL_PATH_PROJECTION_MATRIX_CHROMIUM);
+    validators_.g_l_state.AddValue(GL_PATH_STENCIL_FUNC_CHROMIUM);
+    validators_.g_l_state.AddValue(GL_PATH_STENCIL_REF_CHROMIUM);
+    validators_.g_l_state.AddValue(GL_PATH_STENCIL_VALUE_MASK_CHROMIUM);
   }
 
   if ((gl_version_info_->is_es3 || gl_version_info_->is_desktop_core_profile ||
        extensions.Contains("GL_EXT_texture_rg") ||
        extensions.Contains("GL_ARB_texture_rg")) &&
       IsGL_REDSupportedOnFBOs()) {
     feature_flags_.ext_texture_rg = true;
     AddExtensionString("GL_EXT_texture_rg");
 
     validators_.texture_format.AddValue(GL_RED_EXT);
@@ skipping 108 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu