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https://github.com/OpenMW/openmw.git
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659 lines
28 KiB
C++
659 lines
28 KiB
C++
#include "shadermanager.hpp"
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#include <fstream>
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#include <algorithm>
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#include <sstream>
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#include <regex>
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#include <filesystem>
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#include <set>
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#include <unordered_map>
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#include <chrono>
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#include <osg/Program>
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#include <osgViewer/Viewer>
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#include <components/debug/debuglog.hpp>
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#include <components/misc/strings/algorithm.hpp>
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#include <components/misc/strings/format.hpp>
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#include <components/settings/settings.hpp>
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namespace Shader
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{
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ShaderManager::ShaderManager()
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{
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mHotReloadManager = std::make_unique<HotReloadManager>();
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}
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ShaderManager::~ShaderManager() = default;
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void ShaderManager::setShaderPath(const std::string &path)
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{
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mPath = path;
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}
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bool addLineDirectivesAfterConditionalBlocks(std::string& source)
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{
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for (size_t position = 0; position < source.length(); )
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{
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size_t foundPos = source.find("#endif", position);
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foundPos = std::min(foundPos, source.find("#elif", position));
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foundPos = std::min(foundPos, source.find("#else", position));
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if (foundPos == std::string::npos)
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break;
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foundPos = source.find_first_of("\n\r", foundPos);
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foundPos = source.find_first_not_of("\n\r", foundPos);
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if (foundPos == std::string::npos)
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break;
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size_t lineDirectivePosition = source.rfind("#line", foundPos);
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int lineNumber;
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if (lineDirectivePosition != std::string::npos)
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{
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size_t lineNumberStart = lineDirectivePosition + std::string("#line ").length();
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size_t lineNumberEnd = source.find_first_not_of("0123456789", lineNumberStart);
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std::string lineNumberString = source.substr(lineNumberStart, lineNumberEnd - lineNumberStart);
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lineNumber = std::stoi(lineNumberString) - 1;
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}
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else
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{
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lineDirectivePosition = 0;
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lineNumber = 1;
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}
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lineNumber += std::count(source.begin() + lineDirectivePosition, source.begin() + foundPos, '\n');
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source.replace(foundPos, 0, "#line " + std::to_string(lineNumber) + "\n");
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position = foundPos;
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}
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return true;
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}
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// Recursively replaces include statements with the actual source of the included files.
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// Adjusts #line statements accordingly and detects cyclic includes.
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// cycleIncludeChecker is the set of files that include this file directly or indirectly, and is intentionally not a reference to allow automatic cleanup.
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static bool parseIncludes(const std::filesystem::path& shaderPath, std::string& source, const std::string& fileName, int& fileNumber, std::set<std::filesystem::path> cycleIncludeChecker,std::set<std::filesystem::path>& includedFiles)
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{
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includedFiles.insert(shaderPath / fileName);
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// An include is cyclic if it is being included by itself
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if (cycleIncludeChecker.insert(shaderPath/fileName).second == false)
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{
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Log(Debug::Error) << "Shader " << fileName << " error: Detected cyclic #includes";
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return false;
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}
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Misc::StringUtils::replaceAll(source, "\r\n", "\n");
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size_t foundPos = 0;
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while ((foundPos = source.find("#include")) != std::string::npos)
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{
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size_t start = source.find('"', foundPos);
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if (start == std::string::npos || start == source.size() - 1)
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{
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Log(Debug::Error) << "Shader " << fileName << " error: Invalid #include";
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return false;
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}
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size_t end = source.find('"', start + 1);
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if (end == std::string::npos)
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{
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Log(Debug::Error) << "Shader " << fileName << " error: Invalid #include";
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return false;
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}
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std::string includeFilename = source.substr(start + 1, end - (start + 1));
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std::filesystem::path includePath = shaderPath / includeFilename;
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// Determine the line number that will be used for the #line directive following the included source
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size_t lineDirectivePosition = source.rfind("#line", foundPos);
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int lineNumber;
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if (lineDirectivePosition != std::string::npos)
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{
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size_t lineNumberStart = lineDirectivePosition + std::string("#line ").length();
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size_t lineNumberEnd = source.find_first_not_of("0123456789", lineNumberStart);
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std::string lineNumberString = source.substr(lineNumberStart, lineNumberEnd - lineNumberStart);
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lineNumber = std::stoi(lineNumberString) - 1;
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}
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else
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{
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lineDirectivePosition = 0;
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lineNumber = 0;
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}
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lineNumber += std::count(source.begin() + lineDirectivePosition, source.begin() + foundPos, '\n');
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// Include the file recursively
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std::ifstream includeFstream;
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includeFstream.open(includePath);
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if (includeFstream.fail())
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{
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Log(Debug::Error) << "Shader " << fileName << " error: Failed to open include " << includePath.string();
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return false;
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}
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int includedFileNumber = fileNumber++;
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std::stringstream buffer;
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buffer << includeFstream.rdbuf();
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std::string stringRepresentation = buffer.str();
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if (!addLineDirectivesAfterConditionalBlocks(stringRepresentation)
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|| !parseIncludes(shaderPath, stringRepresentation, includeFilename, fileNumber, cycleIncludeChecker, includedFiles))
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{
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Log(Debug::Error) << "In file included from " << fileName << "." << lineNumber;
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return false;
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}
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std::stringstream toInsert;
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toInsert << "#line 0 " << includedFileNumber << "\n" << stringRepresentation << "\n#line " << lineNumber << " 0\n";
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source.replace(foundPos, (end - foundPos + 1), toInsert.str());
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}
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return true;
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}
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bool parseForeachDirective(std::string& source, const std::string& templateName, size_t foundPos)
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{
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size_t iterNameStart = foundPos + strlen("$foreach") + 1;
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size_t iterNameEnd = source.find_first_of(" \n\r()[].;,", iterNameStart);
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if (iterNameEnd == std::string::npos)
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{
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Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
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return false;
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}
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std::string iteratorName = "$" + source.substr(iterNameStart, iterNameEnd - iterNameStart);
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size_t listStart = iterNameEnd + 1;
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size_t listEnd = source.find_first_of("\n\r", listStart);
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if (listEnd == std::string::npos)
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{
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Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
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return false;
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}
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std::string list = source.substr(listStart, listEnd - listStart);
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std::vector<std::string> listElements;
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if (list != "")
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Misc::StringUtils::split(list, listElements, ",");
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size_t contentStart = source.find_first_not_of("\n\r", listEnd);
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size_t contentEnd = source.find("$endforeach", contentStart);
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if (contentEnd == std::string::npos)
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{
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Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
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return false;
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}
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std::string content = source.substr(contentStart, contentEnd - contentStart);
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size_t overallEnd = contentEnd + std::string("$endforeach").length();
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size_t lineDirectivePosition = source.rfind("#line", overallEnd);
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int lineNumber;
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if (lineDirectivePosition != std::string::npos)
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{
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size_t lineNumberStart = lineDirectivePosition + std::string("#line ").length();
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size_t lineNumberEnd = source.find_first_not_of("0123456789", lineNumberStart);
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std::string lineNumberString = source.substr(lineNumberStart, lineNumberEnd - lineNumberStart);
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lineNumber = std::stoi(lineNumberString);
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}
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else
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{
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lineDirectivePosition = 0;
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lineNumber = 2;
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}
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lineNumber += std::count(source.begin() + lineDirectivePosition, source.begin() + overallEnd, '\n');
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std::string replacement;
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for (std::vector<std::string>::const_iterator element = listElements.cbegin(); element != listElements.cend(); element++)
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{
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std::string contentInstance = content;
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size_t foundIterator;
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while ((foundIterator = contentInstance.find(iteratorName)) != std::string::npos)
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contentInstance.replace(foundIterator, iteratorName.length(), *element);
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replacement += contentInstance;
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}
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replacement += "\n#line " + std::to_string(lineNumber);
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source.replace(foundPos, overallEnd - foundPos, replacement);
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return true;
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}
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bool parseLinkDirective(std::string& source, std::string& linkTarget, const std::string& templateName, size_t foundPos)
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{
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size_t endPos = foundPos + 5;
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size_t lineEnd = source.find_first_of('\n', endPos);
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// If lineEnd = npos, this is the last line, so no need to check
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std::string linkStatement = source.substr(endPos, lineEnd - endPos);
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std::regex linkRegex(
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R"r(\s*"([^"]+)"\s*)r" // Find any quoted string as the link name -> match[1]
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R"r((if\s+)r" // Begin optional condition -> match[2]
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R"r((!)?\s*)r" // Optional ! -> match[3]
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R"r(([_a-zA-Z0-9]+)?)r" // The condition -> match[4]
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R"r()?\s*)r" // End optional condition -> match[2]
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);
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std::smatch linkMatch;
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bool hasCondition = false;
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std::string linkConditionExpression;
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if (std::regex_match(linkStatement, linkMatch, linkRegex))
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{
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linkTarget = linkMatch[1].str();
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hasCondition = !linkMatch[2].str().empty();
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linkConditionExpression = linkMatch[4].str();
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}
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else
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{
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Log(Debug::Error) << "Shader " << templateName << " error: Expected a shader filename to link";
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return false;
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}
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if (linkTarget.empty())
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{
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Log(Debug::Error) << "Shader " << templateName << " error: Empty link name";
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return false;
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}
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if (hasCondition)
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{
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bool condition = !(linkConditionExpression.empty() || linkConditionExpression == "0");
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if (linkMatch[3].str() == "!")
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condition = !condition;
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if (!condition)
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linkTarget.clear();
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}
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source.replace(foundPos, lineEnd - foundPos, "");
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return true;
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}
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bool parseDirectives(std::string& source, std::vector<std::string>& linkedShaderTemplateNames, const ShaderManager::DefineMap& defines, const ShaderManager::DefineMap& globalDefines, const std::string& templateName)
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{
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const char escapeCharacter = '$';
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size_t foundPos = 0;
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while ((foundPos = source.find(escapeCharacter, foundPos)) != std::string::npos)
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{
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size_t endPos = source.find_first_of(" \n\r()[].;,", foundPos);
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if (endPos == std::string::npos)
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{
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Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
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return false;
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}
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std::string directive = source.substr(foundPos + 1, endPos - (foundPos + 1));
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if (directive == "foreach")
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{
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if (!parseForeachDirective(source, templateName, foundPos))
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return false;
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}
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else if (directive == "link")
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{
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std::string linkTarget;
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if (!parseLinkDirective(source, linkTarget, templateName, foundPos))
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return false;
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if (!linkTarget.empty() && linkTarget != templateName)
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linkedShaderTemplateNames.push_back(linkTarget);
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}
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else
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{
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Log(Debug::Error) << "Shader " << templateName << " error: Unknown shader directive: $" << directive;
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return false;
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}
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}
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return true;
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}
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bool parseDefines(std::string& source, const ShaderManager::DefineMap& defines,
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const ShaderManager::DefineMap& globalDefines, const std::string& templateName)
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{
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const char escapeCharacter = '@';
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size_t foundPos = 0;
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std::vector<std::string> forIterators;
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while ((foundPos = source.find(escapeCharacter)) != std::string::npos)
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{
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size_t endPos = source.find_first_of(" \n\r()[].;,", foundPos);
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if (endPos == std::string::npos)
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{
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Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
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return false;
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}
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std::string define = source.substr(foundPos+1, endPos - (foundPos+1));
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ShaderManager::DefineMap::const_iterator defineFound = defines.find(define);
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ShaderManager::DefineMap::const_iterator globalDefineFound = globalDefines.find(define);
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if (define == "foreach")
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{
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source.replace(foundPos, 1, "$");
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size_t iterNameStart = endPos + 1;
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size_t iterNameEnd = source.find_first_of(" \n\r()[].;,", iterNameStart);
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if (iterNameEnd == std::string::npos)
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{
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Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
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return false;
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}
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forIterators.push_back(source.substr(iterNameStart, iterNameEnd - iterNameStart));
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}
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else if (define == "endforeach")
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{
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source.replace(foundPos, 1, "$");
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if (forIterators.empty())
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{
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Log(Debug::Error) << "Shader " << templateName << " error: endforeach without foreach";
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return false;
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}
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else
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forIterators.pop_back();
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}
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else if (define == "link")
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{
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source.replace(foundPos, 1, "$");
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}
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else if (std::find(forIterators.begin(), forIterators.end(), define) != forIterators.end())
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{
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source.replace(foundPos, 1, "$");
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}
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else if (defineFound != defines.end())
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{
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source.replace(foundPos, endPos - foundPos, defineFound->second);
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}
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else if (globalDefineFound != globalDefines.end())
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{
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source.replace(foundPos, endPos - foundPos, globalDefineFound->second);
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}
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else
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{
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Log(Debug::Error) << "Shader " << templateName << " error: Undefined " << define;
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return false;
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}
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}
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return true;
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}
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struct HotReloadManager
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{
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using KeysHolder = std::set<ShaderManager::MapKey>;
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std::unordered_map<std::string, KeysHolder> mShaderFiles;
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std::unordered_map<std::string, std::set<std::filesystem::path>> templateIncludedFiles;
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std::filesystem::file_time_type mLastAutoRecompileTime;
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bool mHotReloadEnabled;
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bool mTriggerReload;
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HotReloadManager()
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{
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mTriggerReload = false;
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mHotReloadEnabled = false;
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mLastAutoRecompileTime = std::filesystem::file_time_type::clock::now();
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}
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void addShaderFiles(const std::string& templateName,const ShaderManager::DefineMap& defines )
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{
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const std::set<std::filesystem::path>& shaderFiles = templateIncludedFiles[templateName];
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for (const std::filesystem::path& file : shaderFiles)
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{
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mShaderFiles[file.string()].insert(std::make_pair(templateName, defines));
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}
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}
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void update(ShaderManager& Manager,osgViewer::Viewer& viewer)
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{
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auto timeSinceLastCheckMillis = std::chrono::duration_cast<std::chrono::milliseconds>(std::filesystem::file_time_type::clock::now() - mLastAutoRecompileTime);
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if ((mHotReloadEnabled && timeSinceLastCheckMillis.count() > 200) || mTriggerReload == true)
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{
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reloadTouchedShaders(Manager, viewer);
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}
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mTriggerReload = false;
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}
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void reloadTouchedShaders(ShaderManager& Manager, osgViewer::Viewer& viewer)
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{
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bool threadsRunningToStop = false;
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for (auto& [pathShaderToTest, shaderKeys]: mShaderFiles)
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{
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std::filesystem::file_time_type write_time = std::filesystem::last_write_time(pathShaderToTest);
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if (write_time.time_since_epoch() > mLastAutoRecompileTime.time_since_epoch())
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{
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if (!threadsRunningToStop)
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{
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threadsRunningToStop = viewer.areThreadsRunning();
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if (threadsRunningToStop)
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viewer.stopThreading();
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}
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for (const auto& [templateName, shaderDefines]: shaderKeys)
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{
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ShaderManager::ShaderMap::iterator shaderIt = Manager.mShaders.find(std::make_pair(templateName, shaderDefines));
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ShaderManager::TemplateMap::iterator templateIt = Manager.mShaderTemplates.find(templateName); //Can't be Null, if we're here it means the template was added
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std::string& shaderSource = templateIt->second;
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std::set<std::filesystem::path> insertedPaths;
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std::filesystem::path path = (std::filesystem::path(Manager.mPath) / templateName);
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std::ifstream stream;
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stream.open(path);
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if (stream.fail())
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{
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Log(Debug::Error) << "Failed to open " << path.string();
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}
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std::stringstream buffer;
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buffer << stream.rdbuf();
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// parse includes
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int fileNumber = 1;
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std::string source = buffer.str();
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if (!addLineDirectivesAfterConditionalBlocks(source)
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|| !parseIncludes(std::filesystem::path(Manager.mPath), source, templateName, fileNumber, {}, insertedPaths))
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{
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break;
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}
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shaderSource = source;
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std::vector<std::string> linkedShaderNames;
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if (!Manager.createSourceFromTemplate(shaderSource, linkedShaderNames, templateName, shaderDefines))
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{
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break;
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}
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shaderIt->second->setShaderSource(shaderSource);
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}
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}
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}
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if (threadsRunningToStop)
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viewer.startThreading();
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mLastAutoRecompileTime = std::filesystem::file_time_type::clock::now();
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}
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};
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osg::ref_ptr<osg::Shader> ShaderManager::getShader(const std::string &templateName, const ShaderManager::DefineMap &defines, osg::Shader::Type shaderType)
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{
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std::unique_lock<std::mutex> lock(mMutex);
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// read the template if we haven't already
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TemplateMap::iterator templateIt = mShaderTemplates.find(templateName);
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std::set<std::filesystem::path> insertedPaths;
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if (templateIt == mShaderTemplates.end())
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{
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std::filesystem::path path = (std::filesystem::path(mPath) / templateName);
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std::ifstream stream;
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stream.open(path);
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if (stream.fail())
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{
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Log(Debug::Error) << "Failed to open " << path.string();
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return nullptr;
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}
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std::stringstream buffer;
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buffer << stream.rdbuf();
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// parse includes
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int fileNumber = 1;
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std::string source = buffer.str();
|
|
if (!addLineDirectivesAfterConditionalBlocks(source)
|
|
|| !parseIncludes(std::filesystem::path(mPath), source, templateName, fileNumber, {}, insertedPaths))
|
|
return nullptr;
|
|
mHotReloadManager->templateIncludedFiles[templateName] = insertedPaths;
|
|
templateIt = mShaderTemplates.insert(std::make_pair(templateName, source)).first;
|
|
}
|
|
|
|
ShaderMap::iterator shaderIt = mShaders.find(std::make_pair(templateName, defines));
|
|
if (shaderIt == mShaders.end())
|
|
{
|
|
std::string shaderSource = templateIt->second;
|
|
std::vector<std::string> linkedShaderNames;
|
|
if (!createSourceFromTemplate(shaderSource, linkedShaderNames, templateName, defines))
|
|
{
|
|
// Add to the cache anyway to avoid logging the same error over and over.
|
|
mShaders.insert(std::make_pair(std::make_pair(templateName, defines), nullptr));
|
|
return nullptr;
|
|
}
|
|
|
|
osg::ref_ptr<osg::Shader> shader (new osg::Shader(shaderType));
|
|
shader->setShaderSource(shaderSource);
|
|
// Assign a unique prefix to allow the SharedStateManager to compare shaders efficiently.
|
|
// Append shader source filename for debugging.
|
|
static unsigned int counter = 0;
|
|
shader->setName(Misc::StringUtils::format("%u %s", counter++, templateName));
|
|
|
|
mHotReloadManager->addShaderFiles(templateName, defines);
|
|
|
|
lock.unlock();
|
|
getLinkedShaders(shader, linkedShaderNames, defines);
|
|
lock.lock();
|
|
|
|
shaderIt = mShaders.insert(std::make_pair(std::make_pair(templateName, defines), shader)).first;
|
|
}
|
|
return shaderIt->second;
|
|
}
|
|
|
|
osg::ref_ptr<osg::Program> ShaderManager::getProgram(osg::ref_ptr<osg::Shader> vertexShader, osg::ref_ptr<osg::Shader> fragmentShader, const osg::Program* programTemplate)
|
|
{
|
|
std::lock_guard<std::mutex> lock(mMutex);
|
|
ProgramMap::iterator found = mPrograms.find(std::make_pair(vertexShader, fragmentShader));
|
|
if (found == mPrograms.end())
|
|
{
|
|
if (!programTemplate) programTemplate = mProgramTemplate;
|
|
osg::ref_ptr<osg::Program> program = programTemplate ? cloneProgram(programTemplate) : osg::ref_ptr<osg::Program>(new osg::Program);
|
|
program->addShader(vertexShader);
|
|
program->addShader(fragmentShader);
|
|
addLinkedShaders(vertexShader, program);
|
|
addLinkedShaders(fragmentShader, program);
|
|
|
|
found = mPrograms.insert(std::make_pair(std::make_pair(vertexShader, fragmentShader), program)).first;
|
|
}
|
|
return found->second;
|
|
}
|
|
|
|
osg::ref_ptr<osg::Program> ShaderManager::cloneProgram(const osg::Program* src)
|
|
{
|
|
osg::ref_ptr<osg::Program> program = static_cast<osg::Program*>(src->clone(osg::CopyOp::SHALLOW_COPY));
|
|
for (auto& [name, idx] : src->getUniformBlockBindingList())
|
|
program->addBindUniformBlock(name, idx);
|
|
return program;
|
|
}
|
|
|
|
ShaderManager::DefineMap ShaderManager::getGlobalDefines()
|
|
{
|
|
return DefineMap(mGlobalDefines);
|
|
}
|
|
|
|
void ShaderManager::setGlobalDefines(DefineMap & globalDefines)
|
|
{
|
|
mGlobalDefines = globalDefines;
|
|
for (const auto& [key, shader]: mShaders)
|
|
{
|
|
std::string templateId = key.first;
|
|
ShaderManager::DefineMap defines = key.second;
|
|
if (shader == nullptr)
|
|
// I'm not sure how to handle a shader that was already broken as there's no way to get a potential replacement to the nodes that need it.
|
|
continue;
|
|
std::string shaderSource = mShaderTemplates[templateId];
|
|
std::vector<std::string> linkedShaderNames;
|
|
if (!createSourceFromTemplate(shaderSource, linkedShaderNames, templateId, defines))
|
|
// We just broke the shader and there's no way to force existing objects back to fixed-function mode as we would when creating the shader.
|
|
// If we put a nullptr in the shader map, we just lose the ability to put a working one in later.
|
|
continue;
|
|
shader->setShaderSource(shaderSource);
|
|
|
|
getLinkedShaders(shader, linkedShaderNames, defines);
|
|
}
|
|
}
|
|
|
|
void ShaderManager::releaseGLObjects(osg::State *state)
|
|
{
|
|
std::lock_guard<std::mutex> lock(mMutex);
|
|
for (const auto& [_, shader] : mShaders)
|
|
{
|
|
if (shader != nullptr)
|
|
shader->releaseGLObjects(state);
|
|
}
|
|
for (const auto& [_, program] : mPrograms)
|
|
program->releaseGLObjects(state);
|
|
}
|
|
|
|
bool ShaderManager::createSourceFromTemplate(std::string& source, std::vector<std::string>& linkedShaderTemplateNames, const std::string& templateName, const ShaderManager::DefineMap& defines)
|
|
{
|
|
if (!parseDefines(source, defines, mGlobalDefines, templateName))
|
|
return false;
|
|
if (!parseDirectives(source, linkedShaderTemplateNames, defines, mGlobalDefines, templateName))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
void ShaderManager::getLinkedShaders(osg::ref_ptr<osg::Shader> shader, const std::vector<std::string>& linkedShaderNames, const DefineMap& defines)
|
|
{
|
|
mLinkedShaders.erase(shader);
|
|
if (linkedShaderNames.empty())
|
|
return;
|
|
|
|
for (auto& linkedShaderName : linkedShaderNames)
|
|
{
|
|
auto linkedShader = getShader(linkedShaderName, defines, shader->getType());
|
|
if (linkedShader)
|
|
mLinkedShaders[shader].emplace_back(linkedShader);
|
|
}
|
|
}
|
|
|
|
void ShaderManager::addLinkedShaders(osg::ref_ptr<osg::Shader> shader, osg::ref_ptr<osg::Program> program)
|
|
{
|
|
auto linkedIt = mLinkedShaders.find(shader);
|
|
if (linkedIt != mLinkedShaders.end())
|
|
for (const auto& linkedShader : linkedIt->second)
|
|
program->addShader(linkedShader);
|
|
}
|
|
|
|
int ShaderManager::reserveGlobalTextureUnits(Slot slot)
|
|
{
|
|
int unit = mReservedTextureUnitsBySlot[static_cast<int>(slot)];
|
|
if (unit >= 0)
|
|
return unit;
|
|
|
|
{
|
|
// Texture units from `8 - numberOfShadowMaps` to `8` are used for shadows, so we skip them here.
|
|
// TODO: Maybe instead of fixed texture units use `reserveGlobalTextureUnits` for shadows as well.
|
|
static const int numberOfShadowMaps = Settings::Manager::getBool("enable shadows", "Shadows") ?
|
|
std::clamp(Settings::Manager::getInt("number of shadow maps", "Shadows"), 1, 8) :
|
|
0;
|
|
if (getAvailableTextureUnits() >= 8 && getAvailableTextureUnits() - 1 < 8)
|
|
mReservedTextureUnits = mMaxTextureUnits - (8 - numberOfShadowMaps);
|
|
}
|
|
|
|
if (getAvailableTextureUnits() < 2)
|
|
throw std::runtime_error("Can't reserve texture unit; no available units");
|
|
mReservedTextureUnits++;
|
|
|
|
unit = mMaxTextureUnits - mReservedTextureUnits;
|
|
|
|
mReservedTextureUnitsBySlot[static_cast<int>(slot)] = unit;
|
|
|
|
return unit;
|
|
}
|
|
|
|
void ShaderManager::update(osgViewer::Viewer& viewer)
|
|
{
|
|
mHotReloadManager->update(*this, viewer);
|
|
}
|
|
|
|
void ShaderManager::setHotReloadEnabled(bool value)
|
|
{
|
|
mHotReloadManager->mHotReloadEnabled = value;
|
|
}
|
|
|
|
void ShaderManager::triggerShaderReload()
|
|
{
|
|
mHotReloadManager->mTriggerReload = true;
|
|
}
|
|
|
|
}
|