gpu/command_buffer/service/texture

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This source file includes following definitions.
GLTargetToFaceIndex
FaceIndexToGLTarget
Destroy
texture_max_anisotropy_initialized_
AddTextureRef
RemoveTextureRef
GetMemTracker
estimated_size
estimated_size
GetCanRenderCondition
CanRender
AddToSignature
SetMailboxManager
MarkMipmapsGenerated
SetTarget
CanGenerateMipmaps
SetLevelCleared
UpdateCleared
UpdateSafeToRenderFrom
UpdateMipCleared
UpdateCanRenderCondition
UpdateHasImages
IncAllFramebufferStateChangeCount
SetLevelInfo
ValidForTexture
GetLevelSize
GetLevelType
SetParameteri
SetParameterf
Update
ClearRenderableLevels
IsLevelCleared
InitTextureMaxAnisotropyIfNeeded
ClearLevel
SetLevelImage
GetLevelImage
OnWillModifyPixels
OnDidModifyPixels
client_id_
Create
have_context_
Initialize
CreateDefaultAndBlackTextures
ValidForTarget
SetTarget
SetLevelCleared
ClearRenderableLevels
ClearTextureLevel
SetLevelInfo
Produce
Consume
SetParameteri
SetParameterf
MarkMipmapsGenerated
CreateTexture
GetTexture
RemoveTexture
StartTracking
StopTracking
GetMemTracker
GetTextureForServiceId
ComputeMipMapCount
SetLevelImage
AddToSignature
UpdateSafeToRenderFrom
UpdateUnclearedMips
UpdateCanRenderCondition
UpdateNumImages
IncFramebufferStateChangeCount
ValidateFormatAndTypeCombination
ValidateTextureParameters
GetTextureInfoForTarget
GetTextureInfoForTargetUnlessDefault
ValidateTexImage2D
ValidateAndDoTexImage2D
DoTexImage2D
begin_time_
// 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/texture_manager.h"
#include "base/bits.h"
#include "base/strings/stringprintf.h"
#include "gpu/command_buffer/common/gles2_cmd_utils.h"
#include "gpu/command_buffer/service/context_state.h"
#include "gpu/command_buffer/service/error_state.h"
#include "gpu/command_buffer/service/feature_info.h"
#include "gpu/command_buffer/service/framebuffer_manager.h"
#include "gpu/command_buffer/service/gles2_cmd_decoder.h"
#include "gpu/command_buffer/service/mailbox_manager.h"
#include "gpu/command_buffer/service/memory_tracking.h"

namespace gpu {
namespace gles2 {

static size_t GLTargetToFaceIndex(GLenum target) {
  switch (target) {
    case GL_TEXTURE_2D:
    case GL_TEXTURE_EXTERNAL_OES:
    case GL_TEXTURE_RECTANGLE_ARB:
      return 0;
    case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
      return 0;
    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
      return 1;
    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
      return 2;
    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
      return 3;
    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
      return 4;
    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
      return 5;
    default:
      NOTREACHED();
      return 0;
  }
}

static size_t FaceIndexToGLTarget(size_t index) {
  switch (index) {
    case 0:
      return GL_TEXTURE_CUBE_MAP_POSITIVE_X;
    case 1:
      return GL_TEXTURE_CUBE_MAP_NEGATIVE_X;
    case 2:
      return GL_TEXTURE_CUBE_MAP_POSITIVE_Y;
    case 3:
      return GL_TEXTURE_CUBE_MAP_NEGATIVE_Y;
    case 4:
      return GL_TEXTURE_CUBE_MAP_POSITIVE_Z;
    case 5:
      return GL_TEXTURE_CUBE_MAP_NEGATIVE_Z;
    default:
      NOTREACHED();
      return 0;
  }
}

TextureManager::DestructionObserver::DestructionObserver() {}

TextureManager::DestructionObserver::~DestructionObserver() {}

TextureManager::~TextureManager() {
  FOR_EACH_OBSERVER(DestructionObserver,
                    destruction_observers_,
                    OnTextureManagerDestroying(this));

  DCHECK(textures_.empty());

  // If this triggers, that means something is keeping a reference to
  // a Texture belonging to this.
  CHECK_EQ(texture_count_, 0u);

  DCHECK_EQ(0, num_unrenderable_textures_);
  DCHECK_EQ(0, num_unsafe_textures_);
  DCHECK_EQ(0, num_uncleared_mips_);
  DCHECK_EQ(0, num_images_);
}

void TextureManager::Destroy(bool have_context) {
  have_context_ = have_context;
  textures_.clear();
  for (int ii = 0; ii < kNumDefaultTextures; ++ii) {
    default_textures_[ii] = NULL;
  }

  if (have_context) {
    glDeleteTextures(arraysize(black_texture_ids_), black_texture_ids_);
  }

  DCHECK_EQ(0u, memory_tracker_managed_->GetMemRepresented());
  DCHECK_EQ(0u, memory_tracker_unmanaged_->GetMemRepresented());
}

Texture::Texture(GLuint service_id)
    : mailbox_manager_(NULL),
      memory_tracking_ref_(NULL),
      service_id_(service_id),
      cleared_(true),
      num_uncleared_mips_(0),
      target_(0),
      min_filter_(GL_NEAREST_MIPMAP_LINEAR),
      mag_filter_(GL_LINEAR),
      wrap_s_(GL_REPEAT),
      wrap_t_(GL_REPEAT),
      usage_(GL_NONE),
      pool_(GL_TEXTURE_POOL_UNMANAGED_CHROMIUM),
      max_level_set_(-1),
      texture_complete_(false),
      cube_complete_(false),
      npot_(false),
      has_been_bound_(false),
      framebuffer_attachment_count_(0),
      immutable_(false),
      has_images_(false),
      estimated_size_(0),
      can_render_condition_(CAN_RENDER_ALWAYS),
      texture_max_anisotropy_initialized_(false) {
}

Texture::~Texture() {
  if (mailbox_manager_)
    mailbox_manager_->TextureDeleted(this);
}

void Texture::AddTextureRef(TextureRef* ref) {
  DCHECK(refs_.find(ref) == refs_.end());
  refs_.insert(ref);
  if (!memory_tracking_ref_) {
    memory_tracking_ref_ = ref;
    GetMemTracker()->TrackMemAlloc(estimated_size());
  }
}

void Texture::RemoveTextureRef(TextureRef* ref, bool have_context) {
  if (memory_tracking_ref_ == ref) {
    GetMemTracker()->TrackMemFree(estimated_size());
    memory_tracking_ref_ = NULL;
  }
  size_t result = refs_.erase(ref);
  DCHECK_EQ(result, 1u);
  if (refs_.empty()) {
    if (have_context) {
      GLuint id = service_id();
      glDeleteTextures(1, &id);
    }
    delete this;
  } else if (memory_tracking_ref_ == NULL) {
    // TODO(piman): tune ownership semantics for cross-context group shared
    // textures.
    memory_tracking_ref_ = *refs_.begin();
    GetMemTracker()->TrackMemAlloc(estimated_size());
  }
}

MemoryTypeTracker* Texture::GetMemTracker() {
  DCHECK(memory_tracking_ref_);
  return memory_tracking_ref_->manager()->GetMemTracker(pool_);
}

Texture::LevelInfo::LevelInfo()
    : cleared(true),
      target(0),
      level(-1),
      internal_format(0),
      width(0),
      height(0),
      depth(0),
      border(0),
      format(0),
      type(0),
      estimated_size(0) {
}

Texture::LevelInfo::LevelInfo(const LevelInfo& rhs)
    : cleared(rhs.cleared),
      target(rhs.target),
      level(rhs.level),
      internal_format(rhs.internal_format),
      width(rhs.width),
      height(rhs.height),
      depth(rhs.depth),
      border(rhs.border),
      format(rhs.format),
      type(rhs.type),
      image(rhs.image),
      estimated_size(rhs.estimated_size) {
}

Texture::LevelInfo::~LevelInfo() {
}

Texture::CanRenderCondition Texture::GetCanRenderCondition() const {
  if (target_ == 0)
    return CAN_RENDER_ALWAYS;

  if (target_ != GL_TEXTURE_EXTERNAL_OES) {
    if (level_infos_.empty()) {
      return CAN_RENDER_NEVER;
    }

    const Texture::LevelInfo& first_face = level_infos_[0][0];
    if (first_face.width == 0 ||
        first_face.height == 0 ||
        first_face.depth == 0) {
      return CAN_RENDER_NEVER;
    }
  }

  bool needs_mips = NeedsMips();
  if (needs_mips) {
    if (!texture_complete())
      return CAN_RENDER_NEVER;
    if (target_ == GL_TEXTURE_CUBE_MAP && !cube_complete())
      return CAN_RENDER_NEVER;
  }

  bool is_npot_compatible = !needs_mips &&
      wrap_s_ == GL_CLAMP_TO_EDGE &&
      wrap_t_ == GL_CLAMP_TO_EDGE;

  if (!is_npot_compatible) {
    if (target_ == GL_TEXTURE_RECTANGLE_ARB)
      return CAN_RENDER_NEVER;
    else if (npot())
      return CAN_RENDER_ONLY_IF_NPOT;
  }

  return CAN_RENDER_ALWAYS;
}

bool Texture::CanRender(const FeatureInfo* feature_info) const {
  switch (can_render_condition_) {
    case CAN_RENDER_ALWAYS:
      return true;
    case CAN_RENDER_NEVER:
      return false;
    case CAN_RENDER_ONLY_IF_NPOT:
      break;
  }
  return feature_info->feature_flags().npot_ok;
}

void Texture::AddToSignature(
    const FeatureInfo* feature_info,
    GLenum target,
    GLint level,
    std::string* signature) const {
  DCHECK(feature_info);
  DCHECK(signature);
  DCHECK_GE(level, 0);
  DCHECK_LT(static_cast<size_t>(GLTargetToFaceIndex(target)),
            level_infos_.size());
  DCHECK_LT(static_cast<size_t>(level),
            level_infos_[GLTargetToFaceIndex(target)].size());
  const Texture::LevelInfo& info =
      level_infos_[GLTargetToFaceIndex(target)][level];
  *signature += base::StringPrintf(
      "|Texture|target=%04x|level=%d|internal_format=%04x"
      "|width=%d|height=%d|depth=%d|border=%d|format=%04x|type=%04x"
      "|image=%d|canrender=%d|canrenderto=%d|npot_=%d"
      "|min_filter=%04x|mag_filter=%04x|wrap_s=%04x|wrap_t=%04x"
      "|usage=%04x",
      target, level, info.internal_format,
      info.width, info.height, info.depth, info.border,
      info.format, info.type, info.image.get() != NULL,
      CanRender(feature_info), CanRenderTo(), npot_,
      min_filter_, mag_filter_, wrap_s_, wrap_t_,
      usage_);
}

void Texture::SetMailboxManager(MailboxManager* mailbox_manager) {
  DCHECK(!mailbox_manager_ || mailbox_manager_ == mailbox_manager);
  mailbox_manager_ = mailbox_manager;
}

bool Texture::MarkMipmapsGenerated(
    const FeatureInfo* feature_info) {
  if (!CanGenerateMipmaps(feature_info)) {
    return false;
  }
  for (size_t ii = 0; ii < level_infos_.size(); ++ii) {
    const Texture::LevelInfo& info1 = level_infos_[ii][0];
    GLsizei width = info1.width;
    GLsizei height = info1.height;
    GLsizei depth = info1.depth;
    GLenum target = target_ == GL_TEXTURE_2D ? GL_TEXTURE_2D :
                               FaceIndexToGLTarget(ii);
    int num_mips =
        TextureManager::ComputeMipMapCount(target_, width, height, depth);
    for (int level = 1; level < num_mips; ++level) {
      width = std::max(1, width >> 1);
      height = std::max(1, height >> 1);
      depth = std::max(1, depth >> 1);
      SetLevelInfo(feature_info,
                   target,
                   level,
                   info1.internal_format,
                   width,
                   height,
                   depth,
                   info1.border,
                   info1.format,
                   info1.type,
                   true);
    }
  }

  return true;
}

void Texture::SetTarget(
    const FeatureInfo* feature_info, GLenum target, GLint max_levels) {
  DCHECK_EQ(0u, target_);  // you can only set this once.
  target_ = target;
  size_t num_faces = (target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
  level_infos_.resize(num_faces);
  for (size_t ii = 0; ii < num_faces; ++ii) {
    level_infos_[ii].resize(max_levels);
  }

  if (target == GL_TEXTURE_EXTERNAL_OES || target == GL_TEXTURE_RECTANGLE_ARB) {
    min_filter_ = GL_LINEAR;
    wrap_s_ = wrap_t_ = GL_CLAMP_TO_EDGE;
  }

  if (target == GL_TEXTURE_EXTERNAL_OES) {
    immutable_ = true;
  }
  Update(feature_info);
  UpdateCanRenderCondition();
}

bool Texture::CanGenerateMipmaps(
    const FeatureInfo* feature_info) const {
  if ((npot() && !feature_info->feature_flags().npot_ok) ||
      level_infos_.empty() ||
      target_ == GL_TEXTURE_EXTERNAL_OES ||
      target_ == GL_TEXTURE_RECTANGLE_ARB) {
    return false;
  }

  // Can't generate mips for depth or stencil textures.
  const Texture::LevelInfo& first = level_infos_[0][0];
  uint32 channels = GLES2Util::GetChannelsForFormat(first.format);
  if (channels & (GLES2Util::kDepth | GLES2Util::kStencil)) {
    return false;
  }

  // TODO(gman): Check internal_format, format and type.
  for (size_t ii = 0; ii < level_infos_.size(); ++ii) {
    const LevelInfo& info = level_infos_[ii][0];
    if ((info.target == 0) || (info.width != first.width) ||
        (info.height != first.height) || (info.depth != 1) ||
        (info.format != first.format) ||
        (info.internal_format != first.internal_format) ||
        (info.type != first.type) ||
        feature_info->validators()->compressed_texture_format.IsValid(
            info.internal_format) ||
        info.image.get()) {
      return false;
    }
  }
  return true;
}

void Texture::SetLevelCleared(GLenum target, GLint level, bool cleared) {
  DCHECK_GE(level, 0);
  DCHECK_LT(static_cast<size_t>(GLTargetToFaceIndex(target)),
            level_infos_.size());
  DCHECK_LT(static_cast<size_t>(level),
            level_infos_[GLTargetToFaceIndex(target)].size());
  Texture::LevelInfo& info =
      level_infos_[GLTargetToFaceIndex(target)][level];
  UpdateMipCleared(&info, cleared);
  UpdateCleared();
}

void Texture::UpdateCleared() {
  if (level_infos_.empty()) {
    return;
  }

  const Texture::LevelInfo& first_face = level_infos_[0][0];
  int levels_needed = TextureManager::ComputeMipMapCount(
      target_, first_face.width, first_face.height, first_face.depth);
  bool cleared = true;
  for (size_t ii = 0; ii < level_infos_.size(); ++ii) {
    for (GLint jj = 0; jj < levels_needed; ++jj) {
      const Texture::LevelInfo& info = level_infos_[ii][jj];
      if (info.width > 0 && info.height > 0 && info.depth > 0 &&
          !info.cleared) {
        cleared = false;
        break;
      }
    }
  }
  UpdateSafeToRenderFrom(cleared);
}

void Texture::UpdateSafeToRenderFrom(bool cleared) {
  if (cleared_ == cleared)
    return;
  cleared_ = cleared;
  int delta = cleared ? -1 : +1;
  for (RefSet::iterator it = refs_.begin(); it != refs_.end(); ++it)
    (*it)->manager()->UpdateSafeToRenderFrom(delta);
}

void Texture::UpdateMipCleared(LevelInfo* info, bool cleared) {
  if (info->cleared == cleared)
    return;
  info->cleared = cleared;
  int delta = cleared ? -1 : +1;
  num_uncleared_mips_ += delta;
  for (RefSet::iterator it = refs_.begin(); it != refs_.end(); ++it)
    (*it)->manager()->UpdateUnclearedMips(delta);
}

void Texture::UpdateCanRenderCondition() {
  CanRenderCondition can_render_condition = GetCanRenderCondition();
  if (can_render_condition_ == can_render_condition)
    return;
  for (RefSet::iterator it = refs_.begin(); it != refs_.end(); ++it)
    (*it)->manager()->UpdateCanRenderCondition(can_render_condition_,
                                               can_render_condition);
  can_render_condition_ = can_render_condition;
}

void Texture::UpdateHasImages() {
  if (level_infos_.empty())
    return;

  bool has_images = false;
  for (size_t ii = 0; ii < level_infos_.size(); ++ii) {
    for (size_t jj = 0; jj < level_infos_[ii].size(); ++jj) {
      const Texture::LevelInfo& info = level_infos_[ii][jj];
      if (info.image.get() != NULL) {
        has_images = true;
        break;
      }
    }
  }

  if (has_images_ == has_images)
    return;
  has_images_ = has_images;
  int delta = has_images ? +1 : -1;
  for (RefSet::iterator it = refs_.begin(); it != refs_.end(); ++it)
    (*it)->manager()->UpdateNumImages(delta);
}

void Texture::IncAllFramebufferStateChangeCount() {
  for (RefSet::iterator it = refs_.begin(); it != refs_.end(); ++it)
    (*it)->manager()->IncFramebufferStateChangeCount();
}

void Texture::SetLevelInfo(
    const FeatureInfo* feature_info,
    GLenum target,
    GLint level,
    GLenum internal_format,
    GLsizei width,
    GLsizei height,
    GLsizei depth,
    GLint border,
    GLenum format,
    GLenum type,
    bool cleared) {
  DCHECK_GE(level, 0);
  DCHECK_LT(static_cast<size_t>(GLTargetToFaceIndex(target)),
            level_infos_.size());
  DCHECK_LT(static_cast<size_t>(level),
            level_infos_[GLTargetToFaceIndex(target)].size());
  DCHECK_GE(width, 0);
  DCHECK_GE(height, 0);
  DCHECK_GE(depth, 0);
  Texture::LevelInfo& info =
      level_infos_[GLTargetToFaceIndex(target)][level];
  info.target = target;
  info.level = level;
  info.internal_format = internal_format;
  info.width = width;
  info.height = height;
  info.depth = depth;
  info.border = border;
  info.format = format;
  info.type = type;
  info.image = 0;

  estimated_size_ -= info.estimated_size;
  GLES2Util::ComputeImageDataSizes(
      width, height, format, type, 4, &info.estimated_size, NULL, NULL);
  estimated_size_ += info.estimated_size;

  UpdateMipCleared(&info, cleared);
  max_level_set_ = std::max(max_level_set_, level);
  Update(feature_info);
  UpdateCleared();
  UpdateCanRenderCondition();
  UpdateHasImages();
  if (IsAttachedToFramebuffer()) {
    // TODO(gman): If textures tracked which framebuffers they were attached to
    // we could just mark those framebuffers as not complete.
    IncAllFramebufferStateChangeCount();
  }
}

bool Texture::ValidForTexture(
    GLint target,
    GLint level,
    GLint xoffset,
    GLint yoffset,
    GLsizei width,
    GLsizei height,
    GLenum type) const {
  size_t face_index = GLTargetToFaceIndex(target);
  if (level >= 0 && face_index < level_infos_.size() &&
      static_cast<size_t>(level) < level_infos_[face_index].size()) {
    const LevelInfo& info = level_infos_[GLTargetToFaceIndex(target)][level];
    int32 right;
    int32 top;
    return SafeAddInt32(xoffset, width, &right) &&
           SafeAddInt32(yoffset, height, &top) &&
           xoffset >= 0 &&
           yoffset >= 0 &&
           right <= info.width &&
           top <= info.height &&
           type == info.type;
  }
  return false;
}

bool Texture::GetLevelSize(
    GLint target, GLint level, GLsizei* width, GLsizei* height) const {
  DCHECK(width);
  DCHECK(height);
  size_t face_index = GLTargetToFaceIndex(target);
  if (level >= 0 && face_index < level_infos_.size() &&
      static_cast<size_t>(level) < level_infos_[face_index].size()) {
    const LevelInfo& info = level_infos_[GLTargetToFaceIndex(target)][level];
    if (info.target != 0) {
      *width = info.width;
      *height = info.height;
      return true;
    }
  }
  return false;
}

bool Texture::GetLevelType(
    GLint target, GLint level, GLenum* type, GLenum* internal_format) const {
  DCHECK(type);
  DCHECK(internal_format);
  size_t face_index = GLTargetToFaceIndex(target);
  if (level >= 0 && face_index < level_infos_.size() &&
      static_cast<size_t>(level) < level_infos_[face_index].size()) {
    const LevelInfo& info = level_infos_[GLTargetToFaceIndex(target)][level];
    if (info.target != 0) {
      *type = info.type;
      *internal_format = info.internal_format;
      return true;
    }
  }
  return false;
}

GLenum Texture::SetParameteri(
    const FeatureInfo* feature_info, GLenum pname, GLint param) {
  DCHECK(feature_info);

  if (target_ == GL_TEXTURE_EXTERNAL_OES ||
      target_ == GL_TEXTURE_RECTANGLE_ARB) {
    if (pname == GL_TEXTURE_MIN_FILTER &&
        (param != GL_NEAREST && param != GL_LINEAR))
      return GL_INVALID_ENUM;
    if ((pname == GL_TEXTURE_WRAP_S || pname == GL_TEXTURE_WRAP_T) &&
        param != GL_CLAMP_TO_EDGE)
      return GL_INVALID_ENUM;
  }

  switch (pname) {
    case GL_TEXTURE_MIN_FILTER:
      if (!feature_info->validators()->texture_min_filter_mode.IsValid(param)) {
        return GL_INVALID_ENUM;
      }
      min_filter_ = param;
      break;
    case GL_TEXTURE_MAG_FILTER:
      if (!feature_info->validators()->texture_mag_filter_mode.IsValid(param)) {
        return GL_INVALID_ENUM;
      }
      mag_filter_ = param;
      break;
    case GL_TEXTURE_POOL_CHROMIUM:
      if (!feature_info->validators()->texture_pool.IsValid(param)) {
        return GL_INVALID_ENUM;
      }
      GetMemTracker()->TrackMemFree(estimated_size());
      pool_ = param;
      GetMemTracker()->TrackMemAlloc(estimated_size());
      break;
    case GL_TEXTURE_WRAP_S:
      if (!feature_info->validators()->texture_wrap_mode.IsValid(param)) {
        return GL_INVALID_ENUM;
      }
      wrap_s_ = param;
      break;
    case GL_TEXTURE_WRAP_T:
      if (!feature_info->validators()->texture_wrap_mode.IsValid(param)) {
        return GL_INVALID_ENUM;
      }
      wrap_t_ = param;
      break;
    case GL_TEXTURE_MAX_ANISOTROPY_EXT:
      if (param < 1) {
        return GL_INVALID_VALUE;
      }
      break;
    case GL_TEXTURE_USAGE_ANGLE:
      if (!feature_info->validators()->texture_usage.IsValid(param)) {
        return GL_INVALID_ENUM;
      }
      usage_ = param;
      break;
    default:
      NOTREACHED();
      return GL_INVALID_ENUM;
  }
  Update(feature_info);
  UpdateCleared();
  UpdateCanRenderCondition();
  return GL_NO_ERROR;
}

GLenum Texture::SetParameterf(
    const FeatureInfo* feature_info, GLenum pname, GLfloat param) {
  switch (pname) {
    case GL_TEXTURE_MIN_FILTER:
    case GL_TEXTURE_MAG_FILTER:
    case GL_TEXTURE_POOL_CHROMIUM:
    case GL_TEXTURE_WRAP_S:
    case GL_TEXTURE_WRAP_T:
    case GL_TEXTURE_USAGE_ANGLE:
      {
        GLint iparam = static_cast<GLint>(param);
        return SetParameteri(feature_info, pname, iparam);
      }
    case GL_TEXTURE_MAX_ANISOTROPY_EXT:
      if (param < 1.f) {
        return GL_INVALID_VALUE;
      }
      break;
    default:
      NOTREACHED();
      return GL_INVALID_ENUM;
  }
  return GL_NO_ERROR;
}

void Texture::Update(const FeatureInfo* feature_info) {
  // Update npot status.
  // Assume GL_TEXTURE_EXTERNAL_OES textures are npot, all others
  npot_ = target_ == GL_TEXTURE_EXTERNAL_OES;

  if (level_infos_.empty()) {
    texture_complete_ = false;
    cube_complete_ = false;
    return;
  }

  // checks that the first mip of any face is npot.
  for (size_t ii = 0; ii < level_infos_.size(); ++ii) {
    const Texture::LevelInfo& info = level_infos_[ii][0];
    if (GLES2Util::IsNPOT(info.width) ||
        GLES2Util::IsNPOT(info.height) ||
        GLES2Util::IsNPOT(info.depth)) {
      npot_ = true;
      break;
    }
  }

  // Update texture_complete and cube_complete status.
  const Texture::LevelInfo& first_face = level_infos_[0][0];
  int levels_needed = TextureManager::ComputeMipMapCount(
      target_, first_face.width, first_face.height, first_face.depth);
  texture_complete_ =
      max_level_set_ >= (levels_needed - 1) && max_level_set_ >= 0;
  cube_complete_ = (level_infos_.size() == 6) &&
                   (first_face.width == first_face.height);

  if (first_face.width == 0 || first_face.height == 0) {
    texture_complete_ = false;
  }
  if (first_face.type == GL_FLOAT &&
      !feature_info->feature_flags().enable_texture_float_linear &&
      (min_filter_ != GL_NEAREST_MIPMAP_NEAREST ||
       mag_filter_ != GL_NEAREST)) {
    texture_complete_ = false;
  } else if (first_face.type == GL_HALF_FLOAT_OES &&
             !feature_info->feature_flags().enable_texture_half_float_linear &&
             (min_filter_ != GL_NEAREST_MIPMAP_NEAREST ||
              mag_filter_ != GL_NEAREST)) {
    texture_complete_ = false;
  }
  for (size_t ii = 0;
       ii < level_infos_.size() && (cube_complete_ || texture_complete_);
       ++ii) {
    const Texture::LevelInfo& level0 = level_infos_[ii][0];
    if (level0.target == 0 ||
        level0.width != first_face.width ||
        level0.height != first_face.height ||
        level0.depth != 1 ||
        level0.internal_format != first_face.internal_format ||
        level0.format != first_face.format ||
        level0.type != first_face.type) {
      cube_complete_ = false;
    }
    // Get level0 dimensions
    GLsizei width = level0.width;
    GLsizei height = level0.height;
    GLsizei depth = level0.depth;
    for (GLint jj = 1; jj < levels_needed; ++jj) {
      // compute required size for mip.
      width = std::max(1, width >> 1);
      height = std::max(1, height >> 1);
      depth = std::max(1, depth >> 1);
      const Texture::LevelInfo& info = level_infos_[ii][jj];
      if (info.target == 0 ||
          info.width != width ||
          info.height != height ||
          info.depth != depth ||
          info.internal_format != level0.internal_format ||
          info.format != level0.format ||
          info.type != level0.type) {
        texture_complete_ = false;
        break;
      }
    }
  }
}

bool Texture::ClearRenderableLevels(GLES2Decoder* decoder) {
  DCHECK(decoder);
  if (cleared_) {
    return true;
  }

  const Texture::LevelInfo& first_face = level_infos_[0][0];
  int levels_needed = TextureManager::ComputeMipMapCount(
      target_, first_face.width, first_face.height, first_face.depth);

  for (size_t ii = 0; ii < level_infos_.size(); ++ii) {
    for (GLint jj = 0; jj < levels_needed; ++jj) {
      Texture::LevelInfo& info = level_infos_[ii][jj];
      if (info.target != 0) {
        if (!ClearLevel(decoder, info.target, jj)) {
          return false;
        }
      }
    }
  }
  UpdateSafeToRenderFrom(true);
  return true;
}

bool Texture::IsLevelCleared(GLenum target, GLint level) const {
  size_t face_index = GLTargetToFaceIndex(target);
  if (face_index >= level_infos_.size() ||
      level >= static_cast<GLint>(level_infos_[face_index].size())) {
    return true;
  }

  const Texture::LevelInfo& info = level_infos_[face_index][level];

  return info.cleared;
}

void Texture::InitTextureMaxAnisotropyIfNeeded(GLenum target) {
  if (texture_max_anisotropy_initialized_)
    return;
  texture_max_anisotropy_initialized_ = true;
  GLfloat params[] = { 1.0f };
  glTexParameterfv(target, GL_TEXTURE_MAX_ANISOTROPY_EXT, params);
}

bool Texture::ClearLevel(
    GLES2Decoder* decoder, GLenum target, GLint level) {
  DCHECK(decoder);
  size_t face_index = GLTargetToFaceIndex(target);
  if (face_index >= level_infos_.size() ||
      level >= static_cast<GLint>(level_infos_[face_index].size())) {
    return true;
  }

  Texture::LevelInfo& info = level_infos_[face_index][level];

  DCHECK(target == info.target);

  if (info.target == 0 ||
      info.cleared ||
      info.width == 0 ||
      info.height == 0 ||
      info.depth == 0) {
    return true;
  }

  // NOTE: It seems kind of gross to call back into the decoder for this
  // but only the decoder knows all the state (like unpack_alignment_) that's
  // needed to be able to call GL correctly.
  bool cleared = decoder->ClearLevel(
      service_id_, target_, info.target, info.level, info.internal_format,
      info.format, info.type, info.width, info.height, immutable_);
  UpdateMipCleared(&info, cleared);
  return info.cleared;
}

void Texture::SetLevelImage(
    const FeatureInfo* feature_info,
    GLenum target,
    GLint level,
    gfx::GLImage* image) {
  DCHECK_GE(level, 0);
  DCHECK_LT(static_cast<size_t>(GLTargetToFaceIndex(target)),
            level_infos_.size());
  DCHECK_LT(static_cast<size_t>(level),
            level_infos_[GLTargetToFaceIndex(target)].size());
  Texture::LevelInfo& info =
      level_infos_[GLTargetToFaceIndex(target)][level];
  DCHECK_EQ(info.target, target);
  DCHECK_EQ(info.level, level);
  info.image = image;
  UpdateCanRenderCondition();
  UpdateHasImages();
}

gfx::GLImage* Texture::GetLevelImage(GLint target, GLint level) const {
  if (target != GL_TEXTURE_2D && target != GL_TEXTURE_EXTERNAL_OES &&
      target != GL_TEXTURE_RECTANGLE_ARB) {
    return NULL;
  }

  size_t face_index = GLTargetToFaceIndex(target);
  if (level >= 0 && face_index < level_infos_.size() &&
      static_cast<size_t>(level) < level_infos_[face_index].size()) {
    const LevelInfo& info = level_infos_[GLTargetToFaceIndex(target)][level];
    if (info.target != 0) {
      return info.image.get();
    }
  }
  return 0;
}

void Texture::OnWillModifyPixels() {
  gfx::GLImage* image = GetLevelImage(target(), 0);
  if (image)
    image->WillModifyTexImage();
}

void Texture::OnDidModifyPixels() {
  gfx::GLImage* image = GetLevelImage(target(), 0);
  if (image)
    image->DidModifyTexImage();
}

TextureRef::TextureRef(TextureManager* manager,
                       GLuint client_id,
                       Texture* texture)
    : manager_(manager),
      texture_(texture),
      client_id_(client_id) {
  DCHECK(manager_);
  DCHECK(texture_);
  texture_->AddTextureRef(this);
  manager_->StartTracking(this);
}

scoped_refptr<TextureRef> TextureRef::Create(TextureManager* manager,
                                             GLuint client_id,
                                             GLuint service_id) {
  return new TextureRef(manager, client_id, new Texture(service_id));
}

TextureRef::~TextureRef() {
  manager_->StopTracking(this);
  texture_->RemoveTextureRef(this, manager_->have_context_);
  manager_ = NULL;
}

TextureManager::TextureManager(MemoryTracker* memory_tracker,
                               FeatureInfo* feature_info,
                               GLint max_texture_size,
                               GLint max_cube_map_texture_size)
    : memory_tracker_managed_(new MemoryTypeTracker(memory_tracker,
                                                    MemoryTracker::kManaged)),
      memory_tracker_unmanaged_(
          new MemoryTypeTracker(memory_tracker, MemoryTracker::kUnmanaged)),
      feature_info_(feature_info),
      framebuffer_manager_(NULL),
      max_texture_size_(max_texture_size),
      max_cube_map_texture_size_(max_cube_map_texture_size),
      max_levels_(ComputeMipMapCount(GL_TEXTURE_2D,
                                     max_texture_size,
                                     max_texture_size,
                                     max_texture_size)),
      max_cube_map_levels_(ComputeMipMapCount(GL_TEXTURE_CUBE_MAP,
                                              max_cube_map_texture_size,
                                              max_cube_map_texture_size,
                                              max_cube_map_texture_size)),
      num_unrenderable_textures_(0),
      num_unsafe_textures_(0),
      num_uncleared_mips_(0),
      num_images_(0),
      texture_count_(0),
      have_context_(true) {
  for (int ii = 0; ii < kNumDefaultTextures; ++ii) {
    black_texture_ids_[ii] = 0;
  }
}

bool TextureManager::Initialize() {
  // TODO(gman): The default textures have to be real textures, not the 0
  // texture because we simulate non shared resources on top of shared
  // resources and all contexts that share resource share the same default
  // texture.
  default_textures_[kTexture2D] = CreateDefaultAndBlackTextures(
      GL_TEXTURE_2D, &black_texture_ids_[kTexture2D]);
  default_textures_[kCubeMap] = CreateDefaultAndBlackTextures(
      GL_TEXTURE_CUBE_MAP, &black_texture_ids_[kCubeMap]);

  if (feature_info_->feature_flags().oes_egl_image_external) {
    default_textures_[kExternalOES] = CreateDefaultAndBlackTextures(
        GL_TEXTURE_EXTERNAL_OES, &black_texture_ids_[kExternalOES]);
  }

  if (feature_info_->feature_flags().arb_texture_rectangle) {
    default_textures_[kRectangleARB] = CreateDefaultAndBlackTextures(
        GL_TEXTURE_RECTANGLE_ARB, &black_texture_ids_[kRectangleARB]);
  }

  return true;
}

scoped_refptr<TextureRef>
    TextureManager::CreateDefaultAndBlackTextures(
        GLenum target,
        GLuint* black_texture) {
  static uint8 black[] = {0, 0, 0, 255};

  // Sampling a texture not associated with any EGLImage sibling will return
  // black values according to the spec.
  bool needs_initialization = (target != GL_TEXTURE_EXTERNAL_OES);
  bool needs_faces = (target == GL_TEXTURE_CUBE_MAP);

  // Make default textures and texture for replacing non-renderable textures.
  GLuint ids[2];
  glGenTextures(arraysize(ids), ids);
  for (unsigned long ii = 0; ii < arraysize(ids); ++ii) {
    glBindTexture(target, ids[ii]);
    if (needs_initialization) {
      if (needs_faces) {
        for (int jj = 0; jj < GLES2Util::kNumFaces; ++jj) {
          glTexImage2D(GLES2Util::IndexToGLFaceTarget(jj), 0, GL_RGBA, 1, 1, 0,
                       GL_RGBA, GL_UNSIGNED_BYTE, black);
        }
      } else {
        glTexImage2D(target, 0, GL_RGBA, 1, 1, 0, GL_RGBA,
                     GL_UNSIGNED_BYTE, black);
      }
    }
  }
  glBindTexture(target, 0);

  scoped_refptr<TextureRef> default_texture(
      TextureRef::Create(this, 0, ids[1]));
  SetTarget(default_texture.get(), target);
  if (needs_faces) {
    for (int ii = 0; ii < GLES2Util::kNumFaces; ++ii) {
      SetLevelInfo(default_texture.get(),
                   GLES2Util::IndexToGLFaceTarget(ii),
                   0,
                   GL_RGBA,
                   1,
                   1,
                   1,
                   0,
                   GL_RGBA,
                   GL_UNSIGNED_BYTE,
                   true);
    }
  } else {
    if (needs_initialization) {
      SetLevelInfo(default_texture.get(),
                   GL_TEXTURE_2D,
                   0,
                   GL_RGBA,
                   1,
                   1,
                   1,
                   0,
                   GL_RGBA,
                   GL_UNSIGNED_BYTE,
                   true);
    } else {
      SetLevelInfo(default_texture.get(),
                   GL_TEXTURE_EXTERNAL_OES,
                   0,
                   GL_RGBA,
                   1,
                   1,
                   1,
                   0,
                   GL_RGBA,
                   GL_UNSIGNED_BYTE,
                   true);
    }
  }

  *black_texture = ids[0];
  return default_texture;
}

bool TextureManager::ValidForTarget(
    GLenum target, GLint level, GLsizei width, GLsizei height, GLsizei depth) {
  GLsizei max_size = MaxSizeForTarget(target) >> level;
  return level >= 0 &&
         width >= 0 &&
         height >= 0 &&
         depth >= 0 &&
         level < MaxLevelsForTarget(target) &&
         width <= max_size &&
         height <= max_size &&
         depth <= max_size &&
         (level == 0 || feature_info_->feature_flags().npot_ok ||
          (!GLES2Util::IsNPOT(width) &&
           !GLES2Util::IsNPOT(height) &&
           !GLES2Util::IsNPOT(depth))) &&
         (target != GL_TEXTURE_CUBE_MAP || (width == height && depth == 1)) &&
         (target != GL_TEXTURE_2D || (depth == 1));
}

void TextureManager::SetTarget(TextureRef* ref, GLenum target) {
  DCHECK(ref);
  ref->texture()
      ->SetTarget(feature_info_.get(), target, MaxLevelsForTarget(target));
}

void TextureManager::SetLevelCleared(TextureRef* ref,
                                     GLenum target,
                                     GLint level,
                                     bool cleared) {
  DCHECK(ref);
  ref->texture()->SetLevelCleared(target, level, cleared);
}

bool TextureManager::ClearRenderableLevels(
    GLES2Decoder* decoder, TextureRef* ref) {
  DCHECK(ref);
  return ref->texture()->ClearRenderableLevels(decoder);
}

bool TextureManager::ClearTextureLevel(
    GLES2Decoder* decoder, TextureRef* ref,
    GLenum target, GLint level) {
  DCHECK(ref);
  Texture* texture = ref->texture();
  if (texture->num_uncleared_mips() == 0) {
    return true;
  }
  bool result = texture->ClearLevel(decoder, target, level);
  texture->UpdateCleared();
  return result;
}

void TextureManager::SetLevelInfo(
    TextureRef* ref,
    GLenum target,
    GLint level,
    GLenum internal_format,
    GLsizei width,
    GLsizei height,
    GLsizei depth,
    GLint border,
    GLenum format,
    GLenum type,
    bool cleared) {
  DCHECK(ref);
  Texture* texture = ref->texture();

  texture->GetMemTracker()->TrackMemFree(texture->estimated_size());
  texture->SetLevelInfo(feature_info_.get(),
                        target,
                        level,
                        internal_format,
                        width,
                        height,
                        depth,
                        border,
                        format,
                        type,
                        cleared);
  texture->GetMemTracker()->TrackMemAlloc(texture->estimated_size());
}

Texture* TextureManager::Produce(TextureRef* ref) {
  DCHECK(ref);
  return ref->texture();
}

TextureRef* TextureManager::Consume(
    GLuint client_id,
    Texture* texture) {
  DCHECK(client_id);
  scoped_refptr<TextureRef> ref(new TextureRef(this, client_id, texture));
  bool result = textures_.insert(std::make_pair(client_id, ref)).second;
  DCHECK(result);
  return ref.get();
}

void TextureManager::SetParameteri(
    const char* function_name, ErrorState* error_state,
    TextureRef* ref, GLenum pname, GLint param) {
  DCHECK(error_state);
  DCHECK(ref);
  Texture* texture = ref->texture();
  GLenum result = texture->SetParameteri(feature_info_.get(), pname, param);
  if (result != GL_NO_ERROR) {
    if (result == GL_INVALID_ENUM) {
      ERRORSTATE_SET_GL_ERROR_INVALID_ENUM(
          error_state, function_name, param, "param");
    } else {
      ERRORSTATE_SET_GL_ERROR_INVALID_PARAMI(
          error_state, result, function_name, pname, param);
    }
  } else {
    // Texture tracking pools exist only for the command decoder, so
    // do not pass them on to the native GL implementation.
    if (pname != GL_TEXTURE_POOL_CHROMIUM) {
      glTexParameteri(texture->target(), pname, param);
    }
  }
}

void TextureManager::SetParameterf(
    const char* function_name, ErrorState* error_state,
    TextureRef* ref, GLenum pname, GLfloat param) {
  DCHECK(error_state);
  DCHECK(ref);
  Texture* texture = ref->texture();
  GLenum result = texture->SetParameterf(feature_info_.get(), pname, param);
  if (result != GL_NO_ERROR) {
    if (result == GL_INVALID_ENUM) {
      ERRORSTATE_SET_GL_ERROR_INVALID_ENUM(
          error_state, function_name, param, "param");
    } else {
      ERRORSTATE_SET_GL_ERROR_INVALID_PARAMF(
          error_state, result, function_name, pname, param);
    }
  } else {
    // Texture tracking pools exist only for the command decoder, so
    // do not pass them on to the native GL implementation.
    if (pname != GL_TEXTURE_POOL_CHROMIUM) {
      glTexParameterf(texture->target(), pname, param);
    }
  }
}

bool TextureManager::MarkMipmapsGenerated(TextureRef* ref) {
  DCHECK(ref);
  Texture* texture = ref->texture();
  texture->GetMemTracker()->TrackMemFree(texture->estimated_size());
  bool result = texture->MarkMipmapsGenerated(feature_info_.get());
  texture->GetMemTracker()->TrackMemAlloc(texture->estimated_size());
  return result;
}

TextureRef* TextureManager::CreateTexture(
    GLuint client_id, GLuint service_id) {
  DCHECK_NE(0u, service_id);
  scoped_refptr<TextureRef> ref(TextureRef::Create(
      this, client_id, service_id));
  std::pair<TextureMap::iterator, bool> result =
      textures_.insert(std::make_pair(client_id, ref));
  DCHECK(result.second);
  return ref.get();
}

TextureRef* TextureManager::GetTexture(
    GLuint client_id) const {
  TextureMap::const_iterator it = textures_.find(client_id);
  return it != textures_.end() ? it->second.get() : NULL;
}

void TextureManager::RemoveTexture(GLuint client_id) {
  TextureMap::iterator it = textures_.find(client_id);
  if (it != textures_.end()) {
    it->second->reset_client_id();
    textures_.erase(it);
  }
}

void TextureManager::StartTracking(TextureRef* ref) {
  Texture* texture = ref->texture();
  ++texture_count_;
  num_uncleared_mips_ += texture->num_uncleared_mips();
  if (!texture->SafeToRenderFrom())
    ++num_unsafe_textures_;
  if (!texture->CanRender(feature_info_.get()))
    ++num_unrenderable_textures_;
  if (texture->HasImages())
    ++num_images_;
}

void TextureManager::StopTracking(TextureRef* ref) {
  FOR_EACH_OBSERVER(DestructionObserver,
                    destruction_observers_,
                    OnTextureRefDestroying(ref));

  Texture* texture = ref->texture();

  --texture_count_;
  if (texture->HasImages()) {
    DCHECK_NE(0, num_images_);
    --num_images_;
  }
  if (!texture->CanRender(feature_info_.get())) {
    DCHECK_NE(0, num_unrenderable_textures_);
    --num_unrenderable_textures_;
  }
  if (!texture->SafeToRenderFrom()) {
    DCHECK_NE(0, num_unsafe_textures_);
    --num_unsafe_textures_;
  }
  num_uncleared_mips_ -= texture->num_uncleared_mips();
  DCHECK_GE(num_uncleared_mips_, 0);
}

MemoryTypeTracker* TextureManager::GetMemTracker(GLenum tracking_pool) {
  switch(tracking_pool) {
    case GL_TEXTURE_POOL_MANAGED_CHROMIUM:
      return memory_tracker_managed_.get();
      break;
    case GL_TEXTURE_POOL_UNMANAGED_CHROMIUM:
      return memory_tracker_unmanaged_.get();
      break;
    default:
      break;
  }
  NOTREACHED();
  return NULL;
}

Texture* TextureManager::GetTextureForServiceId(GLuint service_id) const {
  // This doesn't need to be fast. It's only used during slow queries.
  for (TextureMap::const_iterator it = textures_.begin();
       it != textures_.end(); ++it) {
    Texture* texture = it->second->texture();
    if (texture->service_id() == service_id)
      return texture;
  }
  return NULL;
}

GLsizei TextureManager::ComputeMipMapCount(GLenum target,
                                           GLsizei width,
                                           GLsizei height,
                                           GLsizei depth) {
  switch (target) {
    case GL_TEXTURE_EXTERNAL_OES:
      return 1;
    default:
      return 1 +
             base::bits::Log2Floor(std::max(std::max(width, height), depth));
  }
}

void TextureManager::SetLevelImage(
    TextureRef* ref,
    GLenum target,
    GLint level,
    gfx::GLImage* image) {
  DCHECK(ref);
  ref->texture()->SetLevelImage(feature_info_.get(), target, level, image);
}

void TextureManager::AddToSignature(
    TextureRef* ref,
    GLenum target,
    GLint level,
    std::string* signature) const {
  ref->texture()->AddToSignature(feature_info_.get(), target, level, signature);
}

void TextureManager::UpdateSafeToRenderFrom(int delta) {
  num_unsafe_textures_ += delta;
  DCHECK_GE(num_unsafe_textures_, 0);
}

void TextureManager::UpdateUnclearedMips(int delta) {
  num_uncleared_mips_ += delta;
  DCHECK_GE(num_uncleared_mips_, 0);
}

void TextureManager::UpdateCanRenderCondition(
    Texture::CanRenderCondition old_condition,
    Texture::CanRenderCondition new_condition) {
  if (old_condition == Texture::CAN_RENDER_NEVER ||
      (old_condition == Texture::CAN_RENDER_ONLY_IF_NPOT &&
       !feature_info_->feature_flags().npot_ok)) {
    DCHECK_GT(num_unrenderable_textures_, 0);
    --num_unrenderable_textures_;
  }
  if (new_condition == Texture::CAN_RENDER_NEVER ||
      (new_condition == Texture::CAN_RENDER_ONLY_IF_NPOT &&
       !feature_info_->feature_flags().npot_ok))
    ++num_unrenderable_textures_;
}

void TextureManager::UpdateNumImages(int delta) {
  num_images_ += delta;
  DCHECK_GE(num_images_, 0);
}

void TextureManager::IncFramebufferStateChangeCount() {
  if (framebuffer_manager_)
    framebuffer_manager_->IncFramebufferStateChangeCount();
}

bool TextureManager::ValidateFormatAndTypeCombination(
    ErrorState* error_state, const char* function_name, GLenum format,
    GLenum type) {
  if (!feature_info_->GetTextureFormatValidator(format).IsValid(type)) {
    ERRORSTATE_SET_GL_ERROR(
        error_state, GL_INVALID_OPERATION, function_name,
        (std::string("invalid type ") +
         GLES2Util::GetStringEnum(type) + " for format " +
         GLES2Util::GetStringEnum(format)).c_str());
    return false;
  }
  return true;
}

bool TextureManager::ValidateTextureParameters(
    ErrorState* error_state, const char* function_name,
    GLenum format, GLenum type, GLenum internal_format, GLint level) {
  const Validators* validators = feature_info_->validators();
  if (!validators->texture_format.IsValid(format)) {
    ERRORSTATE_SET_GL_ERROR_INVALID_ENUM(
        error_state, function_name, format, "format");
    return false;
  }
  if (!validators->pixel_type.IsValid(type)) {
    ERRORSTATE_SET_GL_ERROR_INVALID_ENUM(
        error_state, function_name, type, "type");
    return false;
  }
  if (format != internal_format &&
      !((internal_format == GL_RGBA32F && format == GL_RGBA) ||
        (internal_format == GL_RGB32F && format == GL_RGB))) {
    ERRORSTATE_SET_GL_ERROR(
        error_state, GL_INVALID_OPERATION, function_name,
        "format != internalformat");
    return false;
  }
  uint32 channels = GLES2Util::GetChannelsForFormat(format);
  if ((channels & (GLES2Util::kDepth | GLES2Util::kStencil)) != 0 && level) {
    ERRORSTATE_SET_GL_ERROR(
        error_state, GL_INVALID_OPERATION, function_name,
        (std::string("invalid format ") + GLES2Util::GetStringEnum(format) +
         " for level != 0").c_str());
    return false;
  }
  return ValidateFormatAndTypeCombination(error_state, function_name,
      format, type);
}

// Gets the texture id for a given target.
TextureRef* TextureManager::GetTextureInfoForTarget(
    ContextState* state, GLenum target) {
  TextureUnit& unit = state->texture_units[state->active_texture_unit];
  TextureRef* texture = NULL;
  switch (target) {
    case GL_TEXTURE_2D:
      texture = unit.bound_texture_2d.get();
      break;
    case GL_TEXTURE_CUBE_MAP:
    case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
      texture = unit.bound_texture_cube_map.get();
      break;
    case GL_TEXTURE_EXTERNAL_OES:
      texture = unit.bound_texture_external_oes.get();
      break;
    case GL_TEXTURE_RECTANGLE_ARB:
      texture = unit.bound_texture_rectangle_arb.get();
      break;
    default:
      NOTREACHED();
      return NULL;
  }
  return texture;
}

TextureRef* TextureManager::GetTextureInfoForTargetUnlessDefault(
    ContextState* state, GLenum target) {
  TextureRef* texture = GetTextureInfoForTarget(state, target);
  if (!texture)
    return NULL;
  if (texture == GetDefaultTextureInfo(target))
    return NULL;
  return texture;
}

bool TextureManager::ValidateTexImage2D(
    ContextState* state,
    const char* function_name,
    const DoTextImage2DArguments& args,
    TextureRef** texture_ref) {
  ErrorState* error_state = state->GetErrorState();
  const Validators* validators = feature_info_->validators();
  if (!validators->texture_target.IsValid(args.target)) {
    ERRORSTATE_SET_GL_ERROR_INVALID_ENUM(
        error_state, function_name, args.target, "target");
    return false;
  }
  if (!validators->texture_internal_format.IsValid(args.internal_format)) {
    ERRORSTATE_SET_GL_ERROR_INVALID_ENUM(
        error_state, function_name, args.internal_format,
        "internalformat");
    return false;
  }
  if (!ValidateTextureParameters(
      error_state, function_name, args.format, args.type,
      args.internal_format, args.level)) {
    return false;
  }
  if (!ValidForTarget(args.target, args.level, args.width, args.height, 1) ||
      args.border != 0) {
    ERRORSTATE_SET_GL_ERROR(
        error_state, GL_INVALID_VALUE, function_name,
        "dimensions out of range");
    return false;
  }
  if ((GLES2Util::GetChannelsForFormat(args.format) &
       (GLES2Util::kDepth | GLES2Util::kStencil)) != 0 && args.pixels) {
    ERRORSTATE_SET_GL_ERROR(
        error_state, GL_INVALID_OPERATION,
        function_name, "can not supply data for depth or stencil textures");
    return false;
  }

  TextureRef* local_texture_ref = GetTextureInfoForTarget(state, args.target);
  if (!local_texture_ref) {
    ERRORSTATE_SET_GL_ERROR(
        error_state, GL_INVALID_OPERATION, function_name,
        "unknown texture for target");
    return false;
  }
  if (local_texture_ref->texture()->IsImmutable()) {
    ERRORSTATE_SET_GL_ERROR(
        error_state, GL_INVALID_OPERATION, function_name,
        "texture is immutable");
    return false;
  }

  // TODO - verify that using the managed vs unmanaged does not matter.
  // They both use the same MemoryTracker, and this call just re-routes
  // to it.
  if (!memory_tracker_managed_->EnsureGPUMemoryAvailable(args.pixels_size)) {
    ERRORSTATE_SET_GL_ERROR(error_state, GL_OUT_OF_MEMORY, function_name,
                            "out of memory");
    return false;
  }

  // Write the TextureReference since this is valid.
  *texture_ref = local_texture_ref;
  return true;
}

void TextureManager::ValidateAndDoTexImage2D(
    DecoderTextureState* texture_state,
    ContextState* state,
    DecoderFramebufferState* framebuffer_state,
    const DoTextImage2DArguments& args) {
  TextureRef* texture_ref;
  if (!ValidateTexImage2D(state, "glTexImage2D", args, &texture_ref)) {
    return;
  }

  DoTexImage2D(texture_state, state->GetErrorState(), framebuffer_state,
               texture_ref, args);
}

void TextureManager::DoTexImage2D(
    DecoderTextureState* texture_state,
    ErrorState* error_state,
    DecoderFramebufferState* framebuffer_state,
    TextureRef* texture_ref,
    const DoTextImage2DArguments& args) {
  Texture* texture = texture_ref->texture();
  GLsizei tex_width = 0;
  GLsizei tex_height = 0;
  GLenum tex_type = 0;
  GLenum tex_format = 0;
  bool level_is_same =
      texture->GetLevelSize(args.target, args.level, &tex_width, &tex_height) &&
      texture->GetLevelType(args.target, args.level, &tex_type, &tex_format) &&
      args.width == tex_width && args.height == tex_height &&
      args.type == tex_type && args.format == tex_format;

  if (level_is_same && !args.pixels) {
    // Just set the level texture but mark the texture as uncleared.
    SetLevelInfo(
        texture_ref,
        args.target, args.level, args.internal_format, args.width, args.height,
        1, args.border, args.format, args.type, false);
    texture_state->tex_image_2d_failed = false;
    return;
  }

  if (texture->IsAttachedToFramebuffer()) {
    framebuffer_state->clear_state_dirty = true;
  }

  if (texture_state->texsubimage2d_faster_than_teximage2d &&
      level_is_same && args.pixels) {
    {
      ScopedTextureUploadTimer timer(texture_state);
      glTexSubImage2D(args.target, args.level, 0, 0, args.width, args.height,
                      args.format, args.type, args.pixels);
    }
    SetLevelCleared(texture_ref, args.target, args.level, true);
    texture_state->tex_image_2d_failed = false;
    return;
  }

  ERRORSTATE_COPY_REAL_GL_ERRORS_TO_WRAPPER(error_state, "glTexImage2D");
  {
    ScopedTextureUploadTimer timer(texture_state);
    glTexImage2D(
        args.target, args.level, args.internal_format, args.width, args.height,
        args.border, args.format, args.type, args.pixels);
  }
  GLenum error = ERRORSTATE_PEEK_GL_ERROR(error_state, "glTexImage2D");
  if (error == GL_NO_ERROR) {
    SetLevelInfo(
        texture_ref,
        args.target, args.level, args.internal_format, args.width, args.height,
        1, args.border, args.format, args.type, args.pixels != NULL);
    texture_state->tex_image_2d_failed = false;
  }
}

ScopedTextureUploadTimer::ScopedTextureUploadTimer(
    DecoderTextureState* texture_state)
    : texture_state_(texture_state),
      begin_time_(base::TimeTicks::HighResNow()) {
}

ScopedTextureUploadTimer::~ScopedTextureUploadTimer() {
  texture_state_->texture_upload_count++;
  texture_state_->total_texture_upload_time +=
      base::TimeTicks::HighResNow() - begin_time_;
}

}  // namespace gles2
}  // namespace gpu
/* [<][>][^][v][top][bottom][index][help] */
root/gpu/command_buffer/service/texture_manager.cc

DEFINITIONS
