| // Copyright 2015 The Shaderc Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef LIBSHADERC_UTIL_COUNTING_INCLUDER_H |
| #define LIBSHADERC_UTIL_COUNTING_INCLUDER_H |
| |
| #include <atomic> |
| |
| #include "glslang/Public/ShaderLang.h" |
| |
| #include "libshaderc_util/mutex.h" |
| |
| namespace shaderc_util { |
| |
| // An Includer that counts how many #include directives it saw. |
| // Inclusions are internally serialized, but releasing a previous result |
| // can occur concurrently. |
| class CountingIncluder : public glslang::TShader::Includer { |
| public: |
| // Done as .store(0) instead of in the initializer list for the following |
| // reasons: |
| // Clang > 3.6 will complain about it if it is written as ({0}). |
| // VS2013 fails if it is written as {0}. |
| // G++-4.8 does not correctly support std::atomic_init. |
| CountingIncluder() { |
| num_include_directives_.store(0); |
| } |
| |
| enum class IncludeType { |
| System, // Only do < > include search |
| Local, // Only do " " include search |
| }; |
| |
| // Resolves an include request for a source by name, type, and name of the |
| // requesting source. For the semantics of the result, see the base class. |
| // Also increments num_include_directives and returns the results of |
| // include_delegate(filename). Subclasses should override include_delegate() |
| // instead of this method. Inclusions are serialized. |
| glslang::TShader::Includer::IncludeResult* includeSystem( |
| const char* requested_source, const char* requesting_source, |
| size_t include_depth) final { |
| ++num_include_directives_; |
| include_mutex_.lock(); |
| auto result = include_delegate(requested_source, requesting_source, |
| IncludeType::System, include_depth); |
| include_mutex_.unlock(); |
| return result; |
| } |
| |
| // Like includeSystem, but for "local" include search. |
| glslang::TShader::Includer::IncludeResult* includeLocal( |
| const char* requested_source, const char* requesting_source, |
| size_t include_depth) final { |
| ++num_include_directives_; |
| include_mutex_.lock(); |
| auto result = include_delegate(requested_source, requesting_source, |
| IncludeType::Local, include_depth); |
| include_mutex_.unlock(); |
| return result; |
| } |
| |
| // Releases the given IncludeResult. |
| void releaseInclude(glslang::TShader::Includer::IncludeResult* result) final { |
| release_delegate(result); |
| } |
| |
| int num_include_directives() const { return num_include_directives_.load(); } |
| |
| private: |
| |
| // Invoked by this class to provide results to |
| // glslang::TShader::Includer::include. |
| virtual glslang::TShader::Includer::IncludeResult* include_delegate( |
| const char* requested_source, const char* requesting_source, |
| IncludeType type, size_t include_depth) = 0; |
| |
| // Release the given IncludeResult. |
| virtual void release_delegate( |
| glslang::TShader::Includer::IncludeResult* result) = 0; |
| |
| // The number of #include directive encountered. |
| std::atomic_int num_include_directives_; |
| |
| // A mutex to protect against concurrent inclusions. We can't trust |
| // our delegates to be safe for concurrent inclusions. |
| shaderc_util::mutex include_mutex_; |
| }; |
| } |
| |
| #endif // LIBSHADERC_UTIL_COUNTING_INCLUDER_H |