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// Copyright (c) 2016 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.
#ifndef GPU_COMMAND_BUFFER_SERVICE_CLIENT_SERVICE_MAP_H_
#define GPU_COMMAND_BUFFER_SERVICE_CLIENT_SERVICE_MAP_H_
#include <limits>
#include <unordered_map>
#include <vector>
#include "base/logging.h"
namespace gpu {
namespace gles2 {
template <typename ClientType, typename ServiceType>
class ClientServiceMap {
public:
ClientServiceMap()
: ClientServiceMap(std::numeric_limits<ServiceType>::max()) {}
explicit ClientServiceMap(ServiceType invalid_service_id)
: invalid_service_id_(invalid_service_id),
client_to_service_array_(kInitialFlatArraySize, invalid_service_id),
client_to_service_map_() {}
void SetIDMapping(ClientType client_id, ServiceType service_id) {
DCHECK(service_id != invalid_service_id());
if (client_id < kMaxFlatArraySize) {
if (client_id >= client_to_service_array_.size()) {
// Resize the array to the next power of 2 above client_id
size_t new_size = client_to_service_array_.size();
while (client_id >= new_size) {
new_size *= 2;
}
DCHECK(new_size <= kMaxFlatArraySize);
client_to_service_array_.resize(new_size, invalid_service_id());
}
DCHECK(client_to_service_array_[client_id] == invalid_service_id());
client_to_service_array_[client_id] = service_id;
} else {
DCHECK(client_to_service_map_.find(client_id) ==
client_to_service_map_.end());
client_to_service_map_[client_id] = service_id;
}
}
void RemoveClientID(ClientType client_id) {
if (client_id < kMaxFlatArraySize) {
if (client_id < client_to_service_array_.size()) {
client_to_service_array_[client_id] = invalid_service_id();
}
} else {
client_to_service_map_.erase(client_id);
}
}
void Clear() {
client_to_service_array_.clear();
client_to_service_array_.resize(kInitialFlatArraySize,
invalid_service_id());
client_to_service_map_.clear();
}
ALWAYS_INLINE bool GetServiceID(ClientType client_id,
ServiceType* service_id) const {
DCHECK(service_id);
if (client_id >= kMaxFlatArraySize) {
return GetServiceIDFromMap(client_id, service_id);
}
if (client_id < client_to_service_array_.size() &&
client_to_service_array_[client_id] != invalid_service_id()) {
*service_id = client_to_service_array_[client_id];
return true;
}
if (client_id == 0) {
*service_id = ServiceType{};
return true;
}
return false;
}
ALWAYS_INLINE bool HasClientID(ClientType client_id) const {
if (client_id >= kMaxFlatArraySize) {
return GetServiceIDFromMap(client_id, nullptr);
}
return client_id == 0 ||
(client_id < client_to_service_array_.size() &&
client_to_service_array_[client_id] != invalid_service_id());
}
ServiceType GetServiceIDOrInvalid(ClientType client_id) {
ServiceType service_id;
if (GetServiceID(client_id, &service_id)) {
return service_id;
}
return invalid_service_id();
}
bool GetClientID(ServiceType service_id, ClientType* client_id) const {
DCHECK(service_id != invalid_service_id());
for (size_t client_id_idx = 0;
client_id_idx < client_to_service_array_.size(); client_id_idx++) {
if (client_to_service_array_[client_id_idx] == service_id) {
if (client_id) {
*client_id = client_id_idx;
}
return true;
}
}
for (const auto& mapping : client_to_service_map_) {
if (mapping.second == service_id) {
if (client_id) {
*client_id = mapping.first;
}
return true;
}
}
if (service_id == 0) {
*client_id = 0;
}
return false;
}
const ServiceType& invalid_service_id() const { return invalid_service_id_; }
template <typename FunctionType>
void ForEach(FunctionType func) const {
for (size_t client_id_idx = 0;
client_id_idx < client_to_service_array_.size(); client_id_idx++) {
if (client_to_service_array_[client_id_idx] != invalid_service_id()) {
func(client_id_idx, client_to_service_array_[client_id_idx]);
}
}
for (const auto& mapping : client_to_service_map_) {
func(mapping.first, mapping.second);
}
}
// Start with 32 maximum elements in the map, which can grow.
static constexpr size_t kInitialFlatArraySize = 0x20;
// Experimental testing suggests that 16k is a reasonable upper limit.
static constexpr size_t kMaxFlatArraySize = 0x4000;
private:
bool GetServiceIDFromMap(ClientType client_id,
ServiceType* service_id) const {
DCHECK(client_id >= kMaxFlatArraySize);
auto iter = client_to_service_map_.find(client_id);
if (iter != client_to_service_map_.end()) {
if (service_id) {
*service_id = iter->second;
}
return true;
}
return false;
}
ServiceType invalid_service_id_;
std::vector<ServiceType> client_to_service_array_;
std::unordered_map<ClientType, ServiceType> client_to_service_map_;
};
} // namespace gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_CLIENT_SERVICE_MAP_H_
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