blob: 62841eec5ad8dcd609f3365066f1814dcbb3cd0a [file] [log] [blame]
// Copyright (c) 2009 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.
// This file contains a helper template class used to access bit fields in
// unsigned int_ts.
namespace gpu {
// Bitfield template class, used to access bit fields in unsigned int_ts.
template<int shift, int length> class BitField {
static const unsigned int kShift = shift;
static const unsigned int kLength = length;
// the following is really (1<<length)-1 but also work for length == 32
// without compiler warning.
static const unsigned int kMask = 1U + ((1U << (length-1)) - 1U) * 2U;
// Gets the value contained in this field.
static unsigned int Get(unsigned int container) {
return (container >> kShift) & kMask;
// Makes a value that can be or-ed into this field.
static unsigned int MakeValue(unsigned int value) {
return (value & kMask) << kShift;
// Changes the value of this field.
static void Set(unsigned int *container, unsigned int field_value) {
*container = (*container & ~(kMask << kShift)) | MakeValue(field_value);
} // namespace gpu