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Diffstat (limited to 'thirdparty/glslang/StandAlone/DirStackFileIncluder.h')
| -rw-r--r-- | thirdparty/glslang/StandAlone/DirStackFileIncluder.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/thirdparty/glslang/StandAlone/DirStackFileIncluder.h b/thirdparty/glslang/StandAlone/DirStackFileIncluder.h new file mode 100644 index 0000000000..18734130e7 --- /dev/null +++ b/thirdparty/glslang/StandAlone/DirStackFileIncluder.h @@ -0,0 +1,141 @@ +// +// Copyright (C) 2002-2005 3Dlabs Inc. Ltd. +// Copyright (C) 2017 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 3Dlabs Inc. Ltd. 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. +// + +#pragma once + +#include <vector> +#include <string> +#include <fstream> +#include <algorithm> + +#include "./../glslang/Public/ShaderLang.h" + +// Default include class for normal include convention of search backward +// through the stack of active include paths (for nested includes). +// Can be overridden to customize. +class DirStackFileIncluder : public glslang::TShader::Includer { +public: + DirStackFileIncluder() : externalLocalDirectoryCount(0) { } + + virtual IncludeResult* includeLocal(const char* headerName, + const char* includerName, + size_t inclusionDepth) override + { + return readLocalPath(headerName, includerName, (int)inclusionDepth); + } + + virtual IncludeResult* includeSystem(const char* headerName, + const char* /*includerName*/, + size_t /*inclusionDepth*/) override + { + return readSystemPath(headerName); + } + + // Externally set directories. E.g., from a command-line -I<dir>. + // - Most-recently pushed are checked first. + // - All these are checked after the parse-time stack of local directories + // is checked. + // - This only applies to the "local" form of #include. + // - Makes its own copy of the path. + virtual void pushExternalLocalDirectory(const std::string& dir) + { + directoryStack.push_back(dir); + externalLocalDirectoryCount = (int)directoryStack.size(); + } + + virtual void releaseInclude(IncludeResult* result) override + { + if (result != nullptr) { + delete [] static_cast<tUserDataElement*>(result->userData); + delete result; + } + } + + virtual ~DirStackFileIncluder() override { } + +protected: + typedef char tUserDataElement; + std::vector<std::string> directoryStack; + int externalLocalDirectoryCount; + + // Search for a valid "local" path based on combining the stack of include + // directories and the nominal name of the header. + virtual IncludeResult* readLocalPath(const char* headerName, const char* includerName, int depth) + { + // Discard popped include directories, and + // initialize when at parse-time first level. + directoryStack.resize(depth + externalLocalDirectoryCount); + if (depth == 1) + directoryStack.back() = getDirectory(includerName); + + // Find a directory that works, using a reverse search of the include stack. + for (auto it = directoryStack.rbegin(); it != directoryStack.rend(); ++it) { + std::string path = *it + '/' + headerName; + std::replace(path.begin(), path.end(), '\\', '/'); + std::ifstream file(path, std::ios_base::binary | std::ios_base::ate); + if (file) { + directoryStack.push_back(getDirectory(path)); + return newIncludeResult(path, file, (int)file.tellg()); + } + } + + return nullptr; + } + + // Search for a valid <system> path. + // Not implemented yet; returning nullptr signals failure to find. + virtual IncludeResult* readSystemPath(const char* /*headerName*/) const + { + return nullptr; + } + + // Do actual reading of the file, filling in a new include result. + virtual IncludeResult* newIncludeResult(const std::string& path, std::ifstream& file, int length) const + { + char* content = new tUserDataElement [length]; + file.seekg(0, file.beg); + file.read(content, length); + return new IncludeResult(path, content, length, content); + } + + // If no path markers, return current working directory. + // Otherwise, strip file name and return path leading up to it. + virtual std::string getDirectory(const std::string path) const + { + size_t last = path.find_last_of("/\\"); + return last == std::string::npos ? "." : path.substr(0, last); + } +}; |