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//
// Copyright (C) 2016 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 HOLDERS 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.
#ifndef GLSLANG_GTESTS_INITIALIZER_H
#define GLSLANG_GTESTS_INITIALIZER_H
#include "glslang/Public/ShaderLang.h"
namespace glslangtest {
// Initializes glslang on creation, and destroys it on completion.
// And provides .Acquire() as a way to reinitialize glslang if semantics change.
// This object is expected to be a singleton, so that internal glslang state
// can be correctly handled.
//
// TODO(antiagainst): It's a known bug that some of the internal states need to
// be reset if semantics change:
// https://github.com/KhronosGroup/glslang/issues/166
// Therefore, the following mechanism is needed. Remove this once the above bug
// gets fixed.
class GlslangInitializer {
public:
GlslangInitializer() : lastMessages(EShMsgDefault)
{
glslang::InitializeProcess();
}
~GlslangInitializer() { glslang::FinalizeProcess(); }
// A token indicates that the glslang is reinitialized (if necessary) to the
// required semantics. And that won't change until the token is destroyed.
class InitializationToken {
};
// Re-initializes glsl state iff the previous messages and the current
// messages are incompatible. We assume external synchronization, i.e.
// there is at most one acquired token at any one time.
InitializationToken acquire(EShMessages new_messages)
{
if ((lastMessages ^ new_messages) &
(EShMsgVulkanRules | EShMsgSpvRules | EShMsgReadHlsl)) {
glslang::FinalizeProcess();
glslang::InitializeProcess();
}
lastMessages = new_messages;
return InitializationToken();
}
private:
EShMessages lastMessages;
};
} // namespace glslangtest
#endif // GLSLANG_GTESTS_INITIALIZER_H
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