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author | apatrick@google.com <apatrick@google.com@0039d316-1c4b-4281-b951-d872f2087c98> | 2009-11-24 19:34:24 +0000 |
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committer | apatrick@google.com <apatrick@google.com@0039d316-1c4b-4281-b951-d872f2087c98> | 2009-11-24 19:34:24 +0000 |
commit | 97632e2039e3ec0b9342f5e7c074bf631c738a9f (patch) | |
tree | 71e51bad650961671a0aa96b433403fc5a8ff544 /gpu/command_buffer/common/bitfield_helpers.h | |
parent | d4edbe5e406c5773d66d65214b963ed474b34cf4 (diff) | |
download | chromium_src-97632e2039e3ec0b9342f5e7c074bf631c738a9f.zip chromium_src-97632e2039e3ec0b9342f5e7c074bf631c738a9f.tar.gz chromium_src-97632e2039e3ec0b9342f5e7c074bf631c738a9f.tar.bz2 |
Branched gpu process and command buffer code into Chrome tree. Fixed up paths and other minor changes to make it work in the Chrome tree. Will remove copy from O3D tree shortly. Only works in Windows currently.
TEST=none
BUG=none
Review URL: http://codereview.chromium.org/436017
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@32952 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'gpu/command_buffer/common/bitfield_helpers.h')
-rw-r--r-- | gpu/command_buffer/common/bitfield_helpers.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/gpu/command_buffer/common/bitfield_helpers.h b/gpu/command_buffer/common/bitfield_helpers.h new file mode 100644 index 0000000..b74374d --- /dev/null +++ b/gpu/command_buffer/common/bitfield_helpers.h @@ -0,0 +1,68 @@ +/* + * 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_ |