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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// This file contains a helper template class used to access bit fields in
// unsigned int_ts.
#ifndef GPU_COMMAND_BUFFER_COMMON_CROSS_BITFIELD_HELPERS_H_
#define GPU_COMMAND_BUFFER_COMMON_CROSS_BITFIELD_HELPERS_H_
namespace command_buffer {
// Bitfield template class, used to access bit fields in unsigned int_ts.
template<int shift, int length> class BitField {
public:
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 command_buffer
#endif // GPU_COMMAND_BUFFER_COMMON_CROSS_BITFIELD_HELPERS_H_
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