Fix desynched GPU stencil mask cache values.

gpu/command_buffer/service/gles2_cmd_decoder.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/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 3051 matching lines @@
 
 bool GLES2DecoderImpl::CheckFramebufferValid(
     Framebuffer* framebuffer,
     GLenum target, const char* func_name) {
   if (!framebuffer) {
     if (backbuffer_needs_clear_bits_) {
       glClearColor(0, 0, 0, (GLES2Util::GetChannelsForFormat(
           offscreen_target_color_format_) & 0x0008) != 0 ? 0 : 1);
       state_.SetDeviceColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
       glClearStencil(0);
-      glStencilMask(-1);
+      state_.SetDeviceStencilMaskSeparate(GL_FRONT, -1);
+      state_.SetDeviceStencilMaskSeparate(GL_BACK, -1);
       glClearDepth(1.0f);
       state_.SetDeviceDepthMask(GL_TRUE);
       state_.SetDeviceCapabilityState(GL_SCISSOR_TEST, false);
       glClear(backbuffer_needs_clear_bits_);
       backbuffer_needs_clear_bits_ = 0;
       RestoreClearState();
     }
     return true;
   }
 
@@ skipping 1942 matching lines @@
         (GLES2Util::GetChannelsForFormat(
              framebuffer->GetColorAttachmentFormat()) & 0x0008) != 0 ? 0.0f :
                                                                        1.0f);
     state_.SetDeviceColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
     clear_bits |= GL_COLOR_BUFFER_BIT;
   }
 
   if (framebuffer->HasUnclearedAttachment(GL_STENCIL_ATTACHMENT) ||
       framebuffer->HasUnclearedAttachment(GL_DEPTH_STENCIL_ATTACHMENT)) {
     glClearStencil(0);
-    glStencilMask(-1);
+    state_.SetDeviceStencilMaskSeparate(GL_FRONT, -1);
+    state_.SetDeviceStencilMaskSeparate(GL_BACK, -1);
     clear_bits |= GL_STENCIL_BUFFER_BIT;
   }
 
   if (framebuffer->HasUnclearedAttachment(GL_DEPTH_ATTACHMENT) ||
       framebuffer->HasUnclearedAttachment(GL_DEPTH_STENCIL_ATTACHMENT)) {
     glClearDepth(1.0f);
     state_.SetDeviceDepthMask(GL_TRUE);
     clear_bits |= GL_DEPTH_BUFFER_BIT;
   }
 
@@ skipping 2771 matching lines @@
                                        GL_DEPTH_ATTACHMENT;
 
     glFramebufferTexture2DEXT(
         GL_DRAW_FRAMEBUFFER_EXT, attachment, target, service_id, level);
     // ANGLE promises a depth only attachment ok.
     if (glCheckFramebufferStatusEXT(GL_DRAW_FRAMEBUFFER_EXT) !=
         GL_FRAMEBUFFER_COMPLETE) {
       return false;
     }
     glClearStencil(0);
-    glStencilMask(-1);
+    state_.SetDeviceStencilMaskSeparate(GL_FRONT, -1);
+    state_.SetDeviceStencilMaskSeparate(GL_BACK, -1);
     glClearDepth(1.0f);
     state_.SetDeviceDepthMask(GL_TRUE);
     state_.SetDeviceCapabilityState(GL_SCISSOR_TEST, false);
     glClear(GL_DEPTH_BUFFER_BIT | (have_stencil ? GL_STENCIL_BUFFER_BIT : 0));
 
     RestoreClearState();
 
     glDeleteFramebuffersEXT(1, &fb);
     Framebuffer* framebuffer =
         GetFramebufferInfoForTarget(GL_DRAW_FRAMEBUFFER_EXT);
@@ skipping 2934 matching lines @@
   }
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu