// 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_group.h"

#include <stddef.h>
#include <stdint.h>

#include <algorithm>
#include <string>

#include "base/command_line.h"
#include "gpu/command_buffer/service/buffer_manager.h"
#include "gpu/command_buffer/service/framebuffer_manager.h"
#include "gpu/command_buffer/service/gles2_cmd_decoder_passthrough.h"
#include "gpu/command_buffer/service/gpu_preferences.h"
#include "gpu/command_buffer/service/mailbox_manager_impl.h"
#include "gpu/command_buffer/service/path_manager.h"
#include "gpu/command_buffer/service/program_manager.h"
#include "gpu/command_buffer/service/progress_reporter.h"
#include "gpu/command_buffer/service/renderbuffer_manager.h"
#include "gpu/command_buffer/service/sampler_manager.h"
#include "gpu/command_buffer/service/shader_manager.h"
#include "gpu/command_buffer/service/texture_manager.h"
#include "gpu/command_buffer/service/transfer_buffer_manager.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_version_info.h"

namespace gpu {
namespace gles2 {

namespace {

void GetIntegerv(GLenum pname, uint32_t* var) {
  GLint value = 0;
  glGetIntegerv(pname, &value);
  *var = value;
}

DisallowedFeatures AdjustDisallowedFeatures(
    ContextType context_type, const DisallowedFeatures& disallowed_features) {
  DisallowedFeatures adjusted_disallowed_features = disallowed_features;
  if (context_type == CONTEXT_TYPE_WEBGL1) {
    adjusted_disallowed_features.npot_support = true;
    adjusted_disallowed_features.oes_texture_half_float_linear = true;
  }
  if (context_type == CONTEXT_TYPE_WEBGL1 ||
      context_type == CONTEXT_TYPE_WEBGL2) {
    adjusted_disallowed_features.chromium_color_buffer_float_rgba = true;
    adjusted_disallowed_features.chromium_color_buffer_float_rgb = true;
    adjusted_disallowed_features.ext_color_buffer_float = true;
    adjusted_disallowed_features.oes_texture_float_linear = true;
  }
  return adjusted_disallowed_features;
}

}  // namespace anonymous

ContextGroup::ContextGroup(
    const GpuPreferences& gpu_preferences,
    const scoped_refptr<MailboxManager>& mailbox_manager,
    const scoped_refptr<MemoryTracker>& memory_tracker,
    const scoped_refptr<ShaderTranslatorCache>& shader_translator_cache,
    const scoped_refptr<FramebufferCompletenessCache>&
        framebuffer_completeness_cache,
    const scoped_refptr<FeatureInfo>& feature_info,
    bool bind_generates_resource,
    gpu::ImageFactory* image_factory,
    ProgressReporter* progress_reporter)
    : gpu_preferences_(gpu_preferences),
      mailbox_manager_(mailbox_manager),
      memory_tracker_(memory_tracker),
      shader_translator_cache_(shader_translator_cache),
#if defined(OS_MACOSX)
      // Framebuffer completeness is not cacheable on OS X because of dynamic
      // graphics switching.
      // http://crbug.com/180876
      // TODO(tobiasjs): determine whether GPU switching is possible
      // programmatically, rather than just hardcoding this behaviour
      // for OS X.
      framebuffer_completeness_cache_(NULL),
#else
      framebuffer_completeness_cache_(framebuffer_completeness_cache),
#endif
      enforce_gl_minimums_(gpu_preferences_.enforce_gl_minimums),
      bind_generates_resource_(bind_generates_resource),
      max_vertex_attribs_(0u),
      max_texture_units_(0u),
      max_texture_image_units_(0u),
      max_vertex_texture_image_units_(0u),
      max_fragment_uniform_vectors_(0u),
      max_varying_vectors_(0u),
      max_vertex_uniform_vectors_(0u),
      max_color_attachments_(1u),
      max_draw_buffers_(1u),
      max_dual_source_draw_buffers_(0u),
      max_vertex_output_components_(0u),
      max_fragment_input_components_(0u),
      min_program_texel_offset_(0),
      max_program_texel_offset_(0),
      max_transform_feedback_separate_attribs_(0u),
      max_uniform_buffer_bindings_(0u),
      uniform_buffer_offset_alignment_(1u),
      program_cache_(NULL),
      feature_info_(feature_info),
      image_factory_(image_factory),
      passthrough_resources_(new PassthroughResources),
      progress_reporter_(progress_reporter) {
  {
    DCHECK(feature_info_);
    if (!mailbox_manager_.get())
      mailbox_manager_ = new MailboxManagerImpl;
    transfer_buffer_manager_ = new TransferBufferManager(memory_tracker_.get());
  }
}

bool ContextGroup::Initialize(GLES2Decoder* decoder,
                              ContextType context_type,
                              const DisallowedFeatures& disallowed_features) {
  if (!gpu_preferences_.enable_es3_apis &&
      (context_type == CONTEXT_TYPE_OPENGLES3 ||
       context_type == CONTEXT_TYPE_WEBGL2)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because ES3 APIs are "
                << "not available.";
    return false;
  }
  if (HaveContexts()) {
    if (context_type != feature_info_->context_type()) {
      DLOG(ERROR) << "ContextGroup::Initialize failed because the type of "
                  << "the context does not fit with the group.";
      return false;
    }
    // If we've already initialized the group just add the context.
    decoders_.push_back(base::AsWeakPtr<GLES2Decoder>(decoder));
    return true;
  }

  DisallowedFeatures adjusted_disallowed_features =
      AdjustDisallowedFeatures(context_type, disallowed_features);

  if (!feature_info_->Initialize(context_type, adjusted_disallowed_features)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because FeatureInfo "
                << "initialization failed.";
    return false;
  }

  transfer_buffer_manager_->Initialize();

  const GLint kMinRenderbufferSize = 512;  // GL says 1 pixel!
  GLint max_renderbuffer_size = 0;
  if (!QueryGLFeature(
      GL_MAX_RENDERBUFFER_SIZE, kMinRenderbufferSize,
      &max_renderbuffer_size)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                << "renderbuffer size too small (" << max_renderbuffer_size
                << ", should be " << kMinRenderbufferSize << ").";
    return false;
  }
  GLint max_samples = 0;
  if (feature_info_->feature_flags().chromium_framebuffer_multisample ||
      feature_info_->feature_flags().multisampled_render_to_texture) {
    if (feature_info_->feature_flags(
            ).use_img_for_multisampled_render_to_texture) {
      glGetIntegerv(GL_MAX_SAMPLES_IMG, &max_samples);
    } else {
      glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
    }
  }

  if (feature_info_->feature_flags().ext_draw_buffers) {
    GetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &max_color_attachments_);
    if (max_color_attachments_ < 1)
      max_color_attachments_ = 1;
    if (max_color_attachments_ > 16)
      max_color_attachments_ = 16;
    GetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_draw_buffers_);
    if (max_draw_buffers_ < 1)
      max_draw_buffers_ = 1;
    if (max_draw_buffers_ > 16)
      max_draw_buffers_ = 16;
  }
  if (feature_info_->feature_flags().ext_blend_func_extended) {
    GetIntegerv(GL_MAX_DUAL_SOURCE_DRAW_BUFFERS_EXT,
                &max_dual_source_draw_buffers_);
    DCHECK(max_dual_source_draw_buffers_ >= 1);
  }

  if (feature_info_->gl_version_info().is_es3_capable) {
    const GLint kMinTransformFeedbackSeparateAttribs = 4;
    if (!QueryGLFeatureU(GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS,
                         kMinTransformFeedbackSeparateAttribs,
                         &max_transform_feedback_separate_attribs_)) {
      DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                  << "transform feedback separate attribs is too small ("
                  << max_transform_feedback_separate_attribs_ << ", should be "
                  << kMinTransformFeedbackSeparateAttribs << ").";
      return false;
    }

    const GLint kMinUniformBufferBindings = 24;
    if (!QueryGLFeatureU(GL_MAX_UNIFORM_BUFFER_BINDINGS,
                         kMinUniformBufferBindings,
                         &max_uniform_buffer_bindings_)) {
      DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                  << "uniform buffer bindings is too small ("
                  << max_uniform_buffer_bindings_ << ", should be "
                  << kMinUniformBufferBindings << ").";
      return false;
    }

    // TODO(zmo): Should we check max UNIFORM_BUFFER_OFFSET_ALIGNMENT is 256?
    GetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT,
                &uniform_buffer_offset_alignment_);
  }

  buffer_manager_.reset(
      new BufferManager(memory_tracker_.get(), feature_info_.get()));
  framebuffer_manager_.reset(
      new FramebufferManager(max_draw_buffers_, max_color_attachments_,
                             framebuffer_completeness_cache_));
  renderbuffer_manager_.reset(new RenderbufferManager(
      memory_tracker_.get(), max_renderbuffer_size, max_samples,
      feature_info_.get()));
  shader_manager_.reset(new ShaderManager(progress_reporter_));
  sampler_manager_.reset(new SamplerManager(feature_info_.get()));

  // Lookup GL things we need to know.
  const GLint kGLES2RequiredMinimumVertexAttribs = 8u;
  if (!QueryGLFeatureU(
      GL_MAX_VERTEX_ATTRIBS, kGLES2RequiredMinimumVertexAttribs,
      &max_vertex_attribs_)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because too few "
                << "vertex attributes supported (" << max_vertex_attribs_
                << ", should be " << kGLES2RequiredMinimumVertexAttribs << ").";
    return false;
  }

  const GLuint kGLES2RequiredMinimumTextureUnits = 8u;
  if (!QueryGLFeatureU(
      GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, kGLES2RequiredMinimumTextureUnits,
      &max_texture_units_)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because too few "
                << "texture units supported (" << max_texture_units_
                << ", should be " << kGLES2RequiredMinimumTextureUnits << ").";
    return false;
  }

  GLint max_texture_size = 0;
  GLint max_cube_map_texture_size = 0;
  GLint max_rectangle_texture_size = 0;
  GLint max_3d_texture_size = 0;
  GLint max_array_texture_layers = 0;

  const GLint kMinTextureSize = 2048;  // GL actually says 64!?!?
  const GLint kMinCubeMapSize = 256;  // GL actually says 16!?!?
  const GLint kMinRectangleTextureSize = 64;
  const GLint kMin3DTextureSize = 256;
  const GLint kMinArrayTextureLayers = 256;

  if (!QueryGLFeature(GL_MAX_TEXTURE_SIZE, kMinTextureSize,
                      &max_texture_size)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                << "2d texture size is too small (" << max_texture_size
                << ", should be " << kMinTextureSize << ").";
    return false;
  }
  if (!QueryGLFeature(GL_MAX_CUBE_MAP_TEXTURE_SIZE, kMinCubeMapSize,
                      &max_cube_map_texture_size)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                << "cube texture size is too small ("
                << max_cube_map_texture_size << ", should be "
                << kMinCubeMapSize << ").";
    return false;
  }
  if (feature_info_->gl_version_info().is_es3_capable &&
      !QueryGLFeature(GL_MAX_3D_TEXTURE_SIZE, kMin3DTextureSize,
                      &max_3d_texture_size)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                << "3d texture size is too small (" << max_3d_texture_size
                << ", should be " << kMin3DTextureSize << ").";
    return false;
  }
  if (feature_info_->gl_version_info().is_es3_capable &&
      !QueryGLFeature(GL_MAX_ARRAY_TEXTURE_LAYERS, kMinArrayTextureLayers,
                      &max_array_texture_layers)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                << "array texture layers is too small ("
                << max_array_texture_layers
                << ", should be " << kMinArrayTextureLayers << ").";
    return false;
  }
  if (feature_info_->feature_flags().arb_texture_rectangle &&
      !QueryGLFeature(GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB,
                      kMinRectangleTextureSize, &max_rectangle_texture_size)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                << "rectangle texture size is too small ("
                << max_rectangle_texture_size << ", should be "
                << kMinRectangleTextureSize << ").";
    return false;
  }

  if (feature_info_->workarounds().max_texture_size) {
    max_texture_size = std::min(
        max_texture_size,
        feature_info_->workarounds().max_texture_size);
    max_rectangle_texture_size = std::min(
        max_rectangle_texture_size,
        feature_info_->workarounds().max_texture_size);
  }

  texture_manager_.reset(new TextureManager(
      memory_tracker_.get(), feature_info_.get(), max_texture_size,
      max_cube_map_texture_size, max_rectangle_texture_size,
      max_3d_texture_size, max_array_texture_layers, bind_generates_resource_,
      progress_reporter_));
  texture_manager_->set_framebuffer_manager(framebuffer_manager_.get());

  const GLint kMinTextureImageUnits = 8;
  const GLint kMinVertexTextureImageUnits = 0;
  if (!QueryGLFeatureU(GL_MAX_TEXTURE_IMAGE_UNITS, kMinTextureImageUnits,
                       &max_texture_image_units_)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because too few "
                << "texture image units supported ("
                << max_texture_image_units_
                << ", should be " << kMinTextureImageUnits << ").";
  }
  if (!QueryGLFeatureU(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS,
                       kMinVertexTextureImageUnits,
                       &max_vertex_texture_image_units_)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because too few "
                << "vertex texture image units supported ("
                << max_vertex_texture_image_units_ << ", should be "
                << kMinTextureImageUnits << ").";
    return false;
  }

  if (feature_info_->gl_version_info().BehavesLikeGLES()) {
    GetIntegerv(GL_MAX_FRAGMENT_UNIFORM_VECTORS,
        &max_fragment_uniform_vectors_);
    GetIntegerv(GL_MAX_VARYING_VECTORS, &max_varying_vectors_);
    GetIntegerv(GL_MAX_VERTEX_UNIFORM_VECTORS, &max_vertex_uniform_vectors_);
  } else {
    GetIntegerv(
        GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &max_fragment_uniform_vectors_);
    max_fragment_uniform_vectors_ /= 4;
    GetIntegerv(GL_MAX_VARYING_FLOATS, &max_varying_vectors_);
    max_varying_vectors_ /= 4;
    GetIntegerv(GL_MAX_VERTEX_UNIFORM_COMPONENTS, &max_vertex_uniform_vectors_);
    max_vertex_uniform_vectors_ /= 4;
  }

  const GLint kMinFragmentUniformVectors = 16;
  const GLint kMinVaryingVectors = 8;
  const GLint kMinVertexUniformVectors = 128;
  if (!CheckGLFeatureU(
      kMinFragmentUniformVectors, &max_fragment_uniform_vectors_) ||
      !CheckGLFeatureU(kMinVaryingVectors, &max_varying_vectors_) ||
      !CheckGLFeatureU(
      kMinVertexUniformVectors, &max_vertex_uniform_vectors_)) {
    DLOG(ERROR) << "ContextGroup::Initialize failed because too few "
                << "uniforms or varyings supported.";
    return false;
  }

  // Some shaders in Skia need more than the min available vertex and
  // fragment shader uniform vectors in case of OSMesa GL Implementation
  if (feature_info_->workarounds().max_fragment_uniform_vectors) {
    max_fragment_uniform_vectors_ = std::min(
        max_fragment_uniform_vectors_,
        static_cast<uint32_t>(
            feature_info_->workarounds().max_fragment_uniform_vectors));
  }
  if (feature_info_->workarounds().max_varying_vectors) {
    max_varying_vectors_ =
        std::min(max_varying_vectors_,
                 static_cast<uint32_t>(
                     feature_info_->workarounds().max_varying_vectors));
  }
  if (feature_info_->workarounds().max_vertex_uniform_vectors) {
    max_vertex_uniform_vectors_ =
        std::min(max_vertex_uniform_vectors_,
                 static_cast<uint32_t>(
                     feature_info_->workarounds().max_vertex_uniform_vectors));
  }

  if (context_type != CONTEXT_TYPE_WEBGL1 &&
      context_type != CONTEXT_TYPE_OPENGLES2) {
    const GLuint kMinVertexOutputComponents = 64;
    const GLuint kMinFragmentInputComponents = 60;
    const GLint kMin_MaxProgramTexelOffset = 7;
    const GLint kMax_MinProgramTexelOffset = -8;

    if (!QueryGLFeatureU(GL_MAX_VERTEX_OUTPUT_COMPONENTS,
                         kMinVertexOutputComponents,
                         &max_vertex_output_components_)) {
      DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                  << "vertex output components is too small ("
                  << max_vertex_output_components_ << ", should be "
                  << kMinVertexOutputComponents << ").";
      return false;
    }
    if (!QueryGLFeatureU(GL_MAX_FRAGMENT_INPUT_COMPONENTS,
                         kMinFragmentInputComponents,
                         &max_fragment_input_components_)) {
      DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                  << "fragment input components is too small ("
                  << max_fragment_input_components_ << ", should be "
                  << kMinFragmentInputComponents << ").";
      return false;
    }
    if (!QueryGLFeature(GL_MAX_PROGRAM_TEXEL_OFFSET, kMin_MaxProgramTexelOffset,
                        &max_program_texel_offset_)) {
      DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                  << "program texel offset is too small ("
                  << max_program_texel_offset_ << ", should be "
                  << kMin_MaxProgramTexelOffset << ").";
      return false;
    }
    glGetIntegerv(GL_MIN_PROGRAM_TEXEL_OFFSET, &min_program_texel_offset_);
    if (enforce_gl_minimums_) {
      min_program_texel_offset_ =
          std::max(min_program_texel_offset_, kMax_MinProgramTexelOffset);
    }
    if (min_program_texel_offset_ > kMax_MinProgramTexelOffset) {
      DLOG(ERROR) << "ContextGroup::Initialize failed because minimum "
                  << "program texel offset is too big ("
                  << min_program_texel_offset_ << ", should be "
                  << kMax_MinProgramTexelOffset << ").";
      return false;
    }

    const GLint kES3MinCubeMapSize = 2048;
    if (max_cube_map_texture_size < kES3MinCubeMapSize) {
      DLOG(ERROR) << "ContextGroup::Initialize failed because maximum "
                  << "cube texture size is too small ("
                  << max_cube_map_texture_size << ", should be "
                  << kES3MinCubeMapSize << ").";
      return false;
    }
  }

  path_manager_.reset(new PathManager());

  program_manager_.reset(new ProgramManager(
      program_cache_, max_varying_vectors_, max_draw_buffers_,
      max_dual_source_draw_buffers_, max_vertex_attribs_, gpu_preferences_,
      feature_info_.get(), progress_reporter_));

  if (!texture_manager_->Initialize()) {
    DLOG(ERROR) << "Context::Group::Initialize failed because texture manager "
                << "failed to initialize.";
    return false;
  }

  decoders_.push_back(base::AsWeakPtr<GLES2Decoder>(decoder));
  return true;
}

namespace {

bool IsNull(const base::WeakPtr<gles2::GLES2Decoder>& decoder) {
  return !decoder.get();
}

template <typename T>
class WeakPtrEquals {
 public:
  explicit WeakPtrEquals(T* t) : t_(t) {}

  bool operator()(const base::WeakPtr<T>& t) {
    return t.get() == t_;
  }

 private:
  T* const t_;
};

}  // namespace anonymous

bool ContextGroup::HaveContexts() {
  decoders_.erase(std::remove_if(decoders_.begin(), decoders_.end(), IsNull),
                  decoders_.end());
  return !decoders_.empty();
}

void ContextGroup::ReportProgress() {
  if (progress_reporter_)
    progress_reporter_->ReportProgress();
}

void ContextGroup::Destroy(GLES2Decoder* decoder, bool have_context) {
  decoders_.erase(std::remove_if(decoders_.begin(), decoders_.end(),
                                 WeakPtrEquals<gles2::GLES2Decoder>(decoder)),
                  decoders_.end());
  // If we still have contexts do nothing.
  if (HaveContexts()) {
    return;
  }

  if (buffer_manager_ != nullptr) {
    if (!have_context) {
      buffer_manager_->MarkContextLost();
    }
    buffer_manager_->Destroy();
    buffer_manager_.reset();
    ReportProgress();
  }

  if (framebuffer_manager_ != NULL) {
    framebuffer_manager_->Destroy(have_context);
    if (texture_manager_)
      texture_manager_->set_framebuffer_manager(NULL);
    framebuffer_manager_.reset();
    ReportProgress();
  }

  if (renderbuffer_manager_ != NULL) {
    renderbuffer_manager_->Destroy(have_context);
    renderbuffer_manager_.reset();
    ReportProgress();
  }

  if (texture_manager_ != NULL) {
    texture_manager_->Destroy(have_context);
    texture_manager_.reset();
    ReportProgress();
  }

  if (path_manager_ != NULL) {
    path_manager_->Destroy(have_context);
    path_manager_.reset();
    ReportProgress();
  }

  if (program_manager_ != NULL) {
    program_manager_->Destroy(have_context);
    program_manager_.reset();
    ReportProgress();
  }

  if (shader_manager_ != NULL) {
    shader_manager_->Destroy(have_context);
    shader_manager_.reset();
    ReportProgress();
  }

  if (sampler_manager_ != NULL) {
    sampler_manager_->Destroy(have_context);
    sampler_manager_.reset();
    ReportProgress();
  }

  memory_tracker_ = NULL;

  passthrough_resources_->Destroy(have_context);
  passthrough_resources_.reset();
  ReportProgress();
}

uint32_t ContextGroup::GetMemRepresented() const {
  uint32_t total = 0;
  if (buffer_manager_.get())
    total += buffer_manager_->mem_represented();
  if (renderbuffer_manager_.get())
    total += renderbuffer_manager_->mem_represented();
  if (texture_manager_.get())
    total += texture_manager_->mem_represented();
  return total;
}

void ContextGroup::LoseContexts(error::ContextLostReason reason) {
  for (size_t ii = 0; ii < decoders_.size(); ++ii) {
    if (decoders_[ii].get()) {
      decoders_[ii]->MarkContextLost(reason);
    }
  }
  if (buffer_manager_ != nullptr) {
    buffer_manager_->MarkContextLost();
  }
}

ContextGroup::~ContextGroup() {
  CHECK(!HaveContexts());
}

bool ContextGroup::CheckGLFeature(GLint min_required, GLint* v) {
  GLint value = *v;
  if (enforce_gl_minimums_) {
    value = std::min(min_required, value);
  }
  *v = value;
  return value >= min_required;
}

bool ContextGroup::CheckGLFeatureU(GLint min_required, uint32_t* v) {
  GLint value = *v;
  if (enforce_gl_minimums_) {
    value = std::min(min_required, value);
  }
  *v = value;
  return value >= min_required;
}

bool ContextGroup::QueryGLFeature(
    GLenum pname, GLint min_required, GLint* v) {
  GLint value = 0;
  glGetIntegerv(pname, &value);
  *v = value;
  return CheckGLFeature(min_required, v);
}

bool ContextGroup::QueryGLFeatureU(GLenum pname,
                                   GLint min_required,
                                   uint32_t* v) {
  uint32_t value = 0;
  GetIntegerv(pname, &value);
  bool result = CheckGLFeatureU(min_required, &value);
  *v = value;
  return result;
}

bool ContextGroup::GetBufferServiceId(
    GLuint client_id, GLuint* service_id) const {
  Buffer* buffer = buffer_manager_->GetBuffer(client_id);
  if (!buffer)
    return false;
  *service_id = buffer->service_id();
  return true;
}

}  // namespace gles2
}  // namespace gpu