10223e886c
Gtest runs in single-threaded mode. So the GlslangInitializer object in the test code doesn't have to do its own synchronization.
88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
//
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// Copyright (C) 2016 Google, Inc.
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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//
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// Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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#ifndef GLSLANG_GTESTS_INITIALIZER_H
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#define GLSLANG_GTESTS_INITIALIZER_H
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#include "glslang/Public/ShaderLang.h"
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namespace glslangtest {
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// Initializes glslang on creation, and destroys it on completion.
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// And provides .Acquire() as a way to reinitialize glslang if semantics change.
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// This object is expected to be a singleton, so that internal glslang state
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// can be correctly handled.
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//
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// TODO(antiagainst): It's a known bug that some of the internal states need to
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// be reset if semantics change:
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// https://github.com/KhronosGroup/glslang/issues/166
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// Therefore, the following mechanism is needed. Remove this once the above bug
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// gets fixed.
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class GlslangInitializer {
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public:
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GlslangInitializer() : lastMessages(EShMsgDefault)
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{
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glslang::InitializeProcess();
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}
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~GlslangInitializer() { glslang::FinalizeProcess(); }
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// A token indicates that the glslang is reinitialized (if necessary) to the
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// required semantics. And that won't change until the token is destroyed.
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class InitializationToken {
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};
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// Re-initializes glsl state iff the previous messages and the current
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// messages are incompatible. We assume external synchronization, i.e.
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// there is at most one acquired token at any one time.
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InitializationToken acquire(EShMessages new_messages)
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{
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if ((lastMessages ^ new_messages) &
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(EShMsgVulkanRules | EShMsgSpvRules)) {
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glslang::FinalizeProcess();
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glslang::InitializeProcess();
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}
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lastMessages = new_messages;
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return InitializationToken();
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}
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private:
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EShMessages lastMessages;
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};
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} // namespace glslangtest
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#endif // GLSLANG_GTESTS_INITIALIZER_H
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