root/gpu/command_buffer/service/shader_manager.cc

DEFINITIONS

1. valid_
2. IncUseCount
3. DecUseCount
4. MarkAsDeleted
5. SetStatus
6. GetAttribInfo
7. GetAttribMappedName
8. GetOriginalNameFromHashedName
9. GetUniformInfo
10. Destroy
11. CreateShader
12. GetShader
13. GetClientId
14. IsOwned
15. RemoveShader
16. MarkAsDeleted
17. UseShader
18. UnuseShader

// 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/shader_manager.h"

#include <utility>

#include "base/logging.h"
#include "base/strings/string_util.h"

namespace gpu {
namespace gles2 {

Shader::Shader(GLuint service_id, GLenum shader_type)
      : use_count_(0),
        service_id_(service_id),
        shader_type_(shader_type),
        valid_(false) {
}

Shader::~Shader() {
}

void Shader::IncUseCount() {
  ++use_count_;
}

void Shader::DecUseCount() {
  --use_count_;
  DCHECK_GE(use_count_, 0);
}

void Shader::MarkAsDeleted() {
  DCHECK_NE(service_id_, 0u);
  service_id_ = 0;
}

void Shader::SetStatus(
    bool valid, const char* log, ShaderTranslatorInterface* translator) {
  valid_ = valid;
  log_info_.reset(log ? new std::string(log) : NULL);
  if (translator && valid) {
    attrib_map_ = translator->attrib_map();
    uniform_map_ = translator->uniform_map();
    varying_map_ = translator->varying_map();
    name_map_ = translator->name_map();
  } else {
    attrib_map_.clear();
    uniform_map_.clear();
    varying_map_.clear();
    name_map_.clear();
  }
  if (valid && source_.get()) {
    signature_source_.reset(new std::string(source_->c_str()));
  } else {
    signature_source_.reset();
  }
}

const Shader::VariableInfo*
    Shader::GetAttribInfo(
        const std::string& name) const {
  VariableMap::const_iterator it = attrib_map_.find(name);
  return it != attrib_map_.end() ? &it->second : NULL;
}

const std::string* Shader::GetAttribMappedName(
    const std::string& original_name) const {
  for (VariableMap::const_iterator it = attrib_map_.begin();
       it != attrib_map_.end(); ++it) {
    if (it->second.name == original_name)
      return &(it->first);
  }
  return NULL;
}

const std::string* Shader::GetOriginalNameFromHashedName(
    const std::string& hashed_name) const {
  NameMap::const_iterator it = name_map_.find(hashed_name);
  if (it != name_map_.end())
    return &(it->second);
  return NULL;
}

const Shader::VariableInfo*
    Shader::GetUniformInfo(
        const std::string& name) const {
  VariableMap::const_iterator it = uniform_map_.find(name);
  return it != uniform_map_.end() ? &it->second : NULL;
}

ShaderManager::ShaderManager() {}

ShaderManager::~ShaderManager() {
  DCHECK(shaders_.empty());
}

void ShaderManager::Destroy(bool have_context) {
  while (!shaders_.empty()) {
    if (have_context) {
      Shader* shader = shaders_.begin()->second.get();
      if (!shader->IsDeleted()) {
        glDeleteShader(shader->service_id());
        shader->MarkAsDeleted();
      }
    }
    shaders_.erase(shaders_.begin());
  }
}

Shader* ShaderManager::CreateShader(
    GLuint client_id,
    GLuint service_id,
    GLenum shader_type) {
  std::pair<ShaderMap::iterator, bool> result =
      shaders_.insert(std::make_pair(
          client_id, scoped_refptr<Shader>(
              new Shader(service_id, shader_type))));
  DCHECK(result.second);
  return result.first->second.get();
}

Shader* ShaderManager::GetShader(GLuint client_id) {
  ShaderMap::iterator it = shaders_.find(client_id);
  return it != shaders_.end() ? it->second.get() : NULL;
}

bool ShaderManager::GetClientId(GLuint service_id, GLuint* client_id) const {
  // This doesn't need to be fast. It's only used during slow queries.
  for (ShaderMap::const_iterator it = shaders_.begin();
       it != shaders_.end(); ++it) {
    if (it->second->service_id() == service_id) {
      *client_id = it->first;
      return true;
    }
  }
  return false;
}

bool ShaderManager::IsOwned(Shader* shader) {
  for (ShaderMap::iterator it = shaders_.begin();
       it != shaders_.end(); ++it) {
    if (it->second.get() == shader) {
      return true;
    }
  }
  return false;
}

void ShaderManager::RemoveShader(Shader* shader) {
  DCHECK(shader);
  DCHECK(IsOwned(shader));
  if (shader->IsDeleted() && !shader->InUse()) {
    for (ShaderMap::iterator it = shaders_.begin();
         it != shaders_.end(); ++it) {
      if (it->second.get() == shader) {
        shaders_.erase(it);
        return;
      }
    }
    NOTREACHED();
  }
}

void ShaderManager::MarkAsDeleted(Shader* shader) {
  DCHECK(shader);
  DCHECK(IsOwned(shader));
  shader->MarkAsDeleted();
  RemoveShader(shader);
}

void ShaderManager::UseShader(Shader* shader) {
  DCHECK(shader);
  DCHECK(IsOwned(shader));
  shader->IncUseCount();
}

void ShaderManager::UnuseShader(Shader* shader) {
  DCHECK(shader);
  DCHECK(IsOwned(shader));
  shader->DecUseCount();
  RemoveShader(shader);
}

}  // namespace gles2
}  // namespace gpu