Implement external stencil for Android WebView

android_webview/browser/scoped_app_gl_state_restore.cc

 // Copyright 2013 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 "android_webview/browser/scoped_app_gl_state_restore.h"
 
 #include <string>
 
 #include "base/lazy_instance.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 54 matching lines @@
 bool g_globals_initialized = false;
 GLint g_gl_max_texture_units = 0;
 bool g_supports_oes_vertex_array_object = false;
 
 }  // namespace
 
 namespace internal {
 
 class ScopedAppGLStateRestoreImpl {
  public:
-  ScopedAppGLStateRestoreImpl(ScopedAppGLStateRestore::CallMode mode);
+  explicit ScopedAppGLStateRestoreImpl(ScopedAppGLStateRestore::CallMode mode);
   ~ScopedAppGLStateRestoreImpl();
 
-  bool stencil_enabled() const { return stencil_test_; }
+  StencilState stencil_state() const { return stencil_state_; }
   GLint framebuffer_binding_ext() const { return framebuffer_binding_ext_; }
 
  private:
   const ScopedAppGLStateRestore::CallMode mode_;
 
   GLint pack_alignment_;
   GLint unpack_alignment_;
 
   struct {
     GLint enabled;
@@ skipping 39 matching lines @@
   GLboolean blend_enabled_;
   GLint blend_src_rgb_;
   GLint blend_src_alpha_;
   GLint blend_dest_rgb_;
   GLint blend_dest_alpha_;
   GLint active_texture_;
   GLint viewport_[4];
   GLboolean scissor_test_;
   GLint scissor_box_[4];
 
-  GLboolean stencil_test_;
-  GLint stencil_front_func_;
-  GLint stencil_front_ref_;
-  GLint stencil_front_mask_;
-  GLint stencil_back_func_;
-  GLint stencil_back_ref_;
-  GLint stencil_back_mask_;
-  GLint stencil_clear_;
-  GLint stencil_front_writemask_;
-  GLint stencil_back_writemask_;
-  GLint stencil_front_fail_op_;
-  GLint stencil_front_z_fail_op_;
-  GLint stencil_front_z_pass_op_;
-  GLint stencil_back_fail_op_;
-  GLint stencil_back_z_fail_op_;
-  GLint stencil_back_z_pass_op_;
+  StencilState stencil_state_;
 
   GLint framebuffer_binding_ext_;
 
   struct TextureBindings {
     GLint texture_2d;
     GLint texture_cube_map;
     GLint texture_external_oes;
     // TODO(boliu): TEXTURE_RECTANGLE_ARB
   };
 
@@ skipping 68 matching lines @@
   glGetFloatv(GL_SAMPLE_COVERAGE_VALUE, &sample_coverage_value_);
   glGetBooleanv(GL_SAMPLE_COVERAGE_INVERT, &sample_coverage_invert_);
   glGetIntegerv(GL_BLEND_EQUATION_RGB, &blend_equation_rgb_);
   glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &blend_equation_alpha_);
 
   glGetBooleanv(GL_DITHER, &enable_dither_);
   glGetBooleanv(GL_POLYGON_OFFSET_FILL, &enable_polygon_offset_fill_);
   glGetBooleanv(GL_SAMPLE_ALPHA_TO_COVERAGE, &enable_sample_alpha_to_coverage_);
   glGetBooleanv(GL_SAMPLE_COVERAGE, &enable_sample_coverage_);
 
-  glGetBooleanv(GL_STENCIL_TEST, &stencil_test_);
-  glGetIntegerv(GL_STENCIL_FUNC, &stencil_front_func_);
-  glGetIntegerv(GL_STENCIL_VALUE_MASK, &stencil_front_mask_);
-  glGetIntegerv(GL_STENCIL_REF, &stencil_front_ref_);
-  glGetIntegerv(GL_STENCIL_BACK_FUNC, &stencil_back_func_);
-  glGetIntegerv(GL_STENCIL_BACK_VALUE_MASK, &stencil_back_mask_);
-  glGetIntegerv(GL_STENCIL_BACK_REF, &stencil_back_ref_);
-  glGetIntegerv(GL_STENCIL_CLEAR_VALUE, &stencil_clear_);
-  glGetIntegerv(GL_STENCIL_WRITEMASK, &stencil_front_writemask_);
-  glGetIntegerv(GL_STENCIL_BACK_WRITEMASK, &stencil_back_writemask_);
-  glGetIntegerv(GL_STENCIL_FAIL, &stencil_front_fail_op_);
-  glGetIntegerv(GL_STENCIL_PASS_DEPTH_FAIL, &stencil_front_z_fail_op_);
-  glGetIntegerv(GL_STENCIL_PASS_DEPTH_PASS, &stencil_front_z_pass_op_);
-  glGetIntegerv(GL_STENCIL_BACK_FAIL, &stencil_back_fail_op_);
-  glGetIntegerv(GL_STENCIL_BACK_PASS_DEPTH_FAIL, &stencil_back_z_fail_op_);
-  glGetIntegerv(GL_STENCIL_BACK_PASS_DEPTH_PASS, &stencil_back_z_pass_op_);
+  glGetBooleanv(GL_STENCIL_TEST, &stencil_state_.stencil_test_enabled);
+  glGetIntegerv(GL_STENCIL_FUNC, &stencil_state_.stencil_front_func);
+  glGetIntegerv(GL_STENCIL_VALUE_MASK, &stencil_state_.stencil_front_mask);
+  glGetIntegerv(GL_STENCIL_REF, &stencil_state_.stencil_front_ref);
+  glGetIntegerv(GL_STENCIL_BACK_FUNC, &stencil_state_.stencil_back_func);
+  glGetIntegerv(GL_STENCIL_BACK_VALUE_MASK, &stencil_state_.stencil_back_mask);
+  glGetIntegerv(GL_STENCIL_BACK_REF, &stencil_state_.stencil_back_ref);
+  glGetIntegerv(GL_STENCIL_CLEAR_VALUE, &stencil_state_.stencil_clear);
+  glGetIntegerv(GL_STENCIL_WRITEMASK, &stencil_state_.stencil_front_writemask);
+  glGetIntegerv(GL_STENCIL_BACK_WRITEMASK,
+                &stencil_state_.stencil_back_writemask);
+  glGetIntegerv(GL_STENCIL_FAIL, &stencil_state_.stencil_front_fail_op);
+  glGetIntegerv(GL_STENCIL_PASS_DEPTH_FAIL,
+                &stencil_state_.stencil_front_z_fail_op);
+  glGetIntegerv(GL_STENCIL_PASS_DEPTH_PASS,
+                &stencil_state_.stencil_front_z_pass_op);
+  glGetIntegerv(GL_STENCIL_BACK_FAIL, &stencil_state_.stencil_back_fail_op);
+  glGetIntegerv(GL_STENCIL_BACK_PASS_DEPTH_FAIL,
+                &stencil_state_.stencil_back_z_fail_op);
+  glGetIntegerv(GL_STENCIL_BACK_PASS_DEPTH_PASS,
+                &stencil_state_.stencil_back_z_pass_op);
 
   glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &framebuffer_binding_ext_);
 
   glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture_);
 
   texture_bindings_.resize(g_gl_max_texture_units);
   for (int ii = 0; ii < g_gl_max_texture_units; ++ii) {
     glActiveTexture(GL_TEXTURE0 + ii);
     TextureBindings& bindings = texture_bindings_[ii];
     glGetIntegerv(GL_TEXTURE_BINDING_2D, &bindings.texture_2d);
@@ skipping 127 matching lines @@
 
       glViewport(viewport_[0], viewport_[1], viewport_[2], viewport_[3]);
 
       GLEnableDisable(GL_SCISSOR_TEST, scissor_test_);
 
       glScissor(
           scissor_box_[0], scissor_box_[1], scissor_box_[2], scissor_box_[3]);
       break;
   }
 
-  GLEnableDisable(GL_STENCIL_TEST, stencil_test_);
-  glStencilFuncSeparate(
-      GL_FRONT, stencil_front_func_, stencil_front_mask_, stencil_front_ref_);
-  glStencilFuncSeparate(
-      GL_BACK, stencil_back_func_, stencil_back_mask_, stencil_back_ref_);
-  glClearStencil(stencil_clear_);
-  glStencilMaskSeparate(GL_FRONT, stencil_front_writemask_);
-  glStencilMaskSeparate(GL_BACK, stencil_back_writemask_);
-  glStencilOpSeparate(GL_FRONT,
-                      stencil_front_fail_op_,
-                      stencil_front_z_fail_op_,
-                      stencil_front_z_pass_op_);
-  glStencilOpSeparate(GL_BACK,
-                      stencil_back_fail_op_,
-                      stencil_back_z_fail_op_,
-                      stencil_back_z_pass_op_);
+  GLEnableDisable(GL_STENCIL_TEST, stencil_state_.stencil_test_enabled);
+  glStencilFuncSeparate(GL_FRONT, stencil_state_.stencil_front_func,
+                        stencil_state_.stencil_front_mask,
+                        stencil_state_.stencil_front_ref);
+  glStencilFuncSeparate(GL_BACK, stencil_state_.stencil_back_func,
+                        stencil_state_.stencil_back_mask,
+                        stencil_state_.stencil_back_ref);
+  glClearStencil(stencil_state_.stencil_clear);
+  glStencilMaskSeparate(GL_FRONT, stencil_state_.stencil_front_writemask);
+  glStencilMaskSeparate(GL_BACK, stencil_state_.stencil_back_writemask);
+  glStencilOpSeparate(GL_FRONT, stencil_state_.stencil_front_fail_op,
+                      stencil_state_.stencil_front_z_fail_op,
+                      stencil_state_.stencil_front_z_pass_op);
+  glStencilOpSeparate(GL_BACK, stencil_state_.stencil_back_fail_op,
+                      stencil_state_.stencil_back_z_fail_op,
+                      stencil_state_.stencil_back_z_pass_op);
 
   // Do not leak GLError out of chromium.
   ClearGLErrors(true, "Chromium GLError");
 }
 
 }  // namespace internal
 
 ScopedAppGLStateRestore::ScopedAppGLStateRestore(CallMode mode)
     : impl_(new internal::ScopedAppGLStateRestoreImpl(mode)) {
 }
 
 ScopedAppGLStateRestore::~ScopedAppGLStateRestore() {}
 
-bool ScopedAppGLStateRestore::stencil_enabled() const {
-  return impl_->stencil_enabled();
+StencilState ScopedAppGLStateRestore::stencil_state() const {
+  return impl_->stencil_state();
 }
 int ScopedAppGLStateRestore::framebuffer_binding_ext() const {
   return impl_->framebuffer_binding_ext();
 }
 
 }  // namespace android_webview