Implement TransformFeedbackManager in GPU command buffer.

gpu/command_buffer/service/context_state.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/context_state.h"
 
 #include <stddef.h>
 
 #include <cmath>
 
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/service/buffer_manager.h"
 #include "gpu/command_buffer/service/error_state.h"
 #include "gpu/command_buffer/service/framebuffer_manager.h"
 #include "gpu/command_buffer/service/program_manager.h"
 #include "gpu/command_buffer/service/renderbuffer_manager.h"
+#include "gpu/command_buffer/service/transform_feedback_manager.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_version_info.h"
 
 namespace gpu {
 namespace gles2 {
 
 namespace {
 
 GLuint Get2dServiceId(const TextureUnit& unit) {
@@ skipping 259 matching lines @@
 
 void ContextState::RestoreRenderbufferBindings() {
   // Require Renderbuffer rebind.
   bound_renderbuffer_valid = false;
 }
 
 void ContextState::RestoreProgramBindings() const {
   glUseProgram(current_program.get() ? current_program->service_id() : 0);
 }
 
+void ContextState::RestoreTransformFeedbackBindings(
+    const ContextState* prev_state) {
+  if (!feature_info_->IsES3Capable())
+    return;
+  if (prev_state) {
+    if (prev_state->bound_transform_feedback.get() &&
+        prev_state->bound_transform_feedback->active() &&
+        !prev_state->bound_transform_feedback->paused()) {
+      glPauseTransformFeedback();
+    }
+  }
+  if (bound_transform_feedback.get()) {
+    bound_transform_feedback->DoBindTransformFeedback(
+        feature_info_->gl_version_info(), GL_TRANSFORM_FEEDBACK);
+  } else {
+    glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, 0);
+  }
+}
+
 void ContextState::RestoreActiveTexture() const {
   glActiveTexture(GL_TEXTURE0 + active_texture_unit);
 }
 
 void ContextState::RestoreAllTextureUnitBindings(
     const ContextState* prev_state) const {
   // Restore Texture state.
   for (size_t ii = 0; ii < texture_units.size(); ++ii) {
     RestoreTextureUnitBindings(ii, prev_state);
   }
@@ skipping 113 matching lines @@
   InitCapabilities(prev_state);
   InitState(prev_state);
 }
 
 void ContextState::RestoreState(const ContextState* prev_state) {
   RestoreAllTextureUnitBindings(prev_state);
   RestoreVertexAttribs();
   RestoreBufferBindings();
   RestoreRenderbufferBindings();
   RestoreProgramBindings();
+  RestoreTransformFeedbackBindings(prev_state);
   RestoreGlobalState(prev_state);
 }
 
 ErrorState* ContextState::GetErrorState() {
   return error_state_.get();
 }
 
 void ContextState::EnableDisable(GLenum pname, bool enable) const {
   if (pname == GL_PRIMITIVE_RESTART_FIXED_INDEX &&
       feature_info_->feature_flags().emulate_primitive_restart_fixed_index) {
@@ skipping 82 matching lines @@
   if (bound_pixel_unpack_buffer.get() == buffer) {
     bound_pixel_unpack_buffer = nullptr;
     UpdateUnpackParameters();
   }
   if (bound_transform_feedback_buffer.get() == buffer) {
     bound_transform_feedback_buffer = nullptr;
   }
   if (bound_uniform_buffer.get() == buffer) {
     bound_uniform_buffer = nullptr;
   }
+  if (default_transform_feedback.get()) {
+    default_transform_feedback->RemoveBoundBuffer(buffer);
+  }
 }
 
 void ContextState::UnbindTexture(TextureRef* texture) {
   GLuint active_unit = active_texture_unit;
   for (size_t jj = 0; jj < texture_units.size(); ++jj) {
     TextureUnit& unit = texture_units[jj];
     if (unit.bound_texture_2d.get() == texture) {
       unit.bound_texture_2d = NULL;
       if (active_unit != jj) {
         glActiveTexture(GL_TEXTURE0 + jj);
@@ skipping 82 matching lines @@
   UpdateUnpackParameters();
 }
 
 // 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/context_state_impl_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu