| // |
| // 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 |
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| // 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(EShMsgCascadingErrors) |
| { |
| 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 |