You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
openmw/components/shader/shadermanager.cpp

663 lines
28 KiB
C++

#include "shadermanager.hpp"
#include <algorithm>
#include <sstream>
#include <regex>
#include <set>
#include <unordered_map>
#include <chrono>
#include <osg/Program>
#include <osgViewer/Viewer>
#include <boost/filesystem/fstream.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/filesystem/path.hpp>
#include <components/debug/debuglog.hpp>
#include <components/misc/stringops.hpp>
#include <components/settings/settings.hpp>
namespace Shader
{
ShaderManager::ShaderManager()
{
mHotReloadManager = std::make_unique<HotReloadManager>();
}
ShaderManager::~ShaderManager() = default;
void ShaderManager::setShaderPath(const std::string &path)
{
mPath = path;
}
bool addLineDirectivesAfterConditionalBlocks(std::string& source)
{
for (size_t position = 0; position < source.length(); )
{
size_t foundPos = source.find("#endif", position);
foundPos = std::min(foundPos, source.find("#elif", position));
foundPos = std::min(foundPos, source.find("#else", position));
if (foundPos == std::string::npos)
break;
foundPos = source.find_first_of("\n\r", foundPos);
foundPos = source.find_first_not_of("\n\r", foundPos);
if (foundPos == std::string::npos)
break;
size_t lineDirectivePosition = source.rfind("#line", foundPos);
int lineNumber;
if (lineDirectivePosition != std::string::npos)
{
size_t lineNumberStart = lineDirectivePosition + std::string("#line ").length();
size_t lineNumberEnd = source.find_first_not_of("0123456789", lineNumberStart);
std::string lineNumberString = source.substr(lineNumberStart, lineNumberEnd - lineNumberStart);
lineNumber = std::stoi(lineNumberString) - 1;
}
else
{
lineDirectivePosition = 0;
lineNumber = 1;
}
lineNumber += std::count(source.begin() + lineDirectivePosition, source.begin() + foundPos, '\n');
source.replace(foundPos, 0, "#line " + std::to_string(lineNumber) + "\n");
position = foundPos;
}
return true;
}
// Recursively replaces include statements with the actual source of the included files.
// Adjusts #line statements accordingly and detects cyclic includes.
// cycleIncludeChecker is the set of files that include this file directly or indirectly, and is intentionally not a reference to allow automatic cleanup.
static bool parseIncludes(const boost::filesystem::path& shaderPath, std::string& source, const std::string& fileName, int& fileNumber, std::set<boost::filesystem::path> cycleIncludeChecker,std::set<boost::filesystem::path>& includedFiles)
{
includedFiles.insert(shaderPath / fileName);
// An include is cyclic if it is being included by itself
if (cycleIncludeChecker.insert(shaderPath/fileName).second == false)
{
Log(Debug::Error) << "Shader " << fileName << " error: Detected cyclic #includes";
return false;
}
Misc::StringUtils::replaceAll(source, "\r\n", "\n");
size_t foundPos = 0;
while ((foundPos = source.find("#include")) != std::string::npos)
{
size_t start = source.find('"', foundPos);
if (start == std::string::npos || start == source.size() - 1)
{
Log(Debug::Error) << "Shader " << fileName << " error: Invalid #include";
return false;
}
size_t end = source.find('"', start + 1);
if (end == std::string::npos)
{
Log(Debug::Error) << "Shader " << fileName << " error: Invalid #include";
return false;
}
std::string includeFilename = source.substr(start + 1, end - (start + 1));
boost::filesystem::path includePath = shaderPath / includeFilename;
// Determine the line number that will be used for the #line directive following the included source
size_t lineDirectivePosition = source.rfind("#line", foundPos);
int lineNumber;
if (lineDirectivePosition != std::string::npos)
{
size_t lineNumberStart = lineDirectivePosition + std::string("#line ").length();
size_t lineNumberEnd = source.find_first_not_of("0123456789", lineNumberStart);
std::string lineNumberString = source.substr(lineNumberStart, lineNumberEnd - lineNumberStart);
lineNumber = std::stoi(lineNumberString) - 1;
}
else
{
lineDirectivePosition = 0;
lineNumber = 0;
}
lineNumber += std::count(source.begin() + lineDirectivePosition, source.begin() + foundPos, '\n');
// Include the file recursively
boost::filesystem::ifstream includeFstream;
includeFstream.open(includePath);
if (includeFstream.fail())
{
Log(Debug::Error) << "Shader " << fileName << " error: Failed to open include " << includePath.string();
return false;
}
int includedFileNumber = fileNumber++;
std::stringstream buffer;
buffer << includeFstream.rdbuf();
std::string stringRepresentation = buffer.str();
if (!addLineDirectivesAfterConditionalBlocks(stringRepresentation)
|| !parseIncludes(shaderPath, stringRepresentation, includeFilename, fileNumber, cycleIncludeChecker, includedFiles))
{
Log(Debug::Error) << "In file included from " << fileName << "." << lineNumber;
return false;
}
std::stringstream toInsert;
toInsert << "#line 0 " << includedFileNumber << "\n" << stringRepresentation << "\n#line " << lineNumber << " 0\n";
source.replace(foundPos, (end - foundPos + 1), toInsert.str());
}
return true;
}
bool parseForeachDirective(std::string& source, const std::string& templateName, size_t foundPos)
{
size_t iterNameStart = foundPos + strlen("$foreach") + 1;
size_t iterNameEnd = source.find_first_of(" \n\r()[].;,", iterNameStart);
if (iterNameEnd == std::string::npos)
{
Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
return false;
}
std::string iteratorName = "$" + source.substr(iterNameStart, iterNameEnd - iterNameStart);
size_t listStart = iterNameEnd + 1;
size_t listEnd = source.find_first_of("\n\r", listStart);
if (listEnd == std::string::npos)
{
Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
return false;
}
std::string list = source.substr(listStart, listEnd - listStart);
std::vector<std::string> listElements;
if (list != "")
Misc::StringUtils::split(list, listElements, ",");
size_t contentStart = source.find_first_not_of("\n\r", listEnd);
size_t contentEnd = source.find("$endforeach", contentStart);
if (contentEnd == std::string::npos)
{
Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
return false;
}
std::string content = source.substr(contentStart, contentEnd - contentStart);
size_t overallEnd = contentEnd + std::string("$endforeach").length();
size_t lineDirectivePosition = source.rfind("#line", overallEnd);
int lineNumber;
if (lineDirectivePosition != std::string::npos)
{
size_t lineNumberStart = lineDirectivePosition + std::string("#line ").length();
size_t lineNumberEnd = source.find_first_not_of("0123456789", lineNumberStart);
std::string lineNumberString = source.substr(lineNumberStart, lineNumberEnd - lineNumberStart);
lineNumber = std::stoi(lineNumberString);
}
else
{
lineDirectivePosition = 0;
lineNumber = 2;
}
lineNumber += std::count(source.begin() + lineDirectivePosition, source.begin() + overallEnd, '\n');
std::string replacement;
for (std::vector<std::string>::const_iterator element = listElements.cbegin(); element != listElements.cend(); element++)
{
std::string contentInstance = content;
size_t foundIterator;
while ((foundIterator = contentInstance.find(iteratorName)) != std::string::npos)
contentInstance.replace(foundIterator, iteratorName.length(), *element);
replacement += contentInstance;
}
replacement += "\n#line " + std::to_string(lineNumber);
source.replace(foundPos, overallEnd - foundPos, replacement);
return true;
}
bool parseLinkDirective(std::string& source, std::string& linkTarget, const std::string& templateName, size_t foundPos)
{
size_t endPos = foundPos + 5;
size_t lineEnd = source.find_first_of('\n', endPos);
// If lineEnd = npos, this is the last line, so no need to check
std::string linkStatement = source.substr(endPos, lineEnd - endPos);
std::regex linkRegex(
R"r(\s*"([^"]+)"\s*)r" // Find any quoted string as the link name -> match[1]
R"r((if\s+)r" // Begin optional condition -> match[2]
R"r((!)?\s*)r" // Optional ! -> match[3]
R"r(([_a-zA-Z0-9]+)?)r" // The condition -> match[4]
R"r()?\s*)r" // End optional condition -> match[2]
);
std::smatch linkMatch;
bool hasCondition = false;
std::string linkConditionExpression;
if (std::regex_match(linkStatement, linkMatch, linkRegex))
{
linkTarget = linkMatch[1].str();
hasCondition = !linkMatch[2].str().empty();
linkConditionExpression = linkMatch[4].str();
}
else
{
Log(Debug::Error) << "Shader " << templateName << " error: Expected a shader filename to link";
return false;
}
if (linkTarget.empty())
{
Log(Debug::Error) << "Shader " << templateName << " error: Empty link name";
return false;
}
if (hasCondition)
{
bool condition = !(linkConditionExpression.empty() || linkConditionExpression == "0");
if (linkMatch[3].str() == "!")
condition = !condition;
if (!condition)
linkTarget.clear();
}
source.replace(foundPos, lineEnd - foundPos, "");
return true;
}
bool parseDirectives(std::string& source, std::vector<std::string>& linkedShaderTemplateNames, const ShaderManager::DefineMap& defines, const ShaderManager::DefineMap& globalDefines, const std::string& templateName)
{
const char escapeCharacter = '$';
size_t foundPos = 0;
while ((foundPos = source.find(escapeCharacter, foundPos)) != std::string::npos)
{
size_t endPos = source.find_first_of(" \n\r()[].;,", foundPos);
if (endPos == std::string::npos)
{
Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
return false;
}
std::string directive = source.substr(foundPos + 1, endPos - (foundPos + 1));
if (directive == "foreach")
{
if (!parseForeachDirective(source, templateName, foundPos))
return false;
}
else if (directive == "link")
{
std::string linkTarget;
if (!parseLinkDirective(source, linkTarget, templateName, foundPos))
return false;
if (!linkTarget.empty() && linkTarget != templateName)
linkedShaderTemplateNames.push_back(linkTarget);
}
else
{
Log(Debug::Error) << "Shader " << templateName << " error: Unknown shader directive: $" << directive;
return false;
}
}
return true;
}
bool parseDefines(std::string& source, const ShaderManager::DefineMap& defines,
const ShaderManager::DefineMap& globalDefines, const std::string& templateName)
{
const char escapeCharacter = '@';
size_t foundPos = 0;
std::vector<std::string> forIterators;
while ((foundPos = source.find(escapeCharacter)) != std::string::npos)
{
size_t endPos = source.find_first_of(" \n\r()[].;,", foundPos);
if (endPos == std::string::npos)
{
Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
return false;
}
std::string define = source.substr(foundPos+1, endPos - (foundPos+1));
ShaderManager::DefineMap::const_iterator defineFound = defines.find(define);
ShaderManager::DefineMap::const_iterator globalDefineFound = globalDefines.find(define);
if (define == "foreach")
{
source.replace(foundPos, 1, "$");
size_t iterNameStart = endPos + 1;
size_t iterNameEnd = source.find_first_of(" \n\r()[].;,", iterNameStart);
if (iterNameEnd == std::string::npos)
{
Log(Debug::Error) << "Shader " << templateName << " error: Unexpected EOF";
return false;
}
forIterators.push_back(source.substr(iterNameStart, iterNameEnd - iterNameStart));
}
else if (define == "endforeach")
{
source.replace(foundPos, 1, "$");
if (forIterators.empty())
{
Log(Debug::Error) << "Shader " << templateName << " error: endforeach without foreach";
return false;
}
else
forIterators.pop_back();
}
else if (define == "link")
{
source.replace(foundPos, 1, "$");
}
else if (std::find(forIterators.begin(), forIterators.end(), define) != forIterators.end())
{
source.replace(foundPos, 1, "$");
}
else if (defineFound != defines.end())
{
source.replace(foundPos, endPos - foundPos, defineFound->second);
}
else if (globalDefineFound != globalDefines.end())
{
source.replace(foundPos, endPos - foundPos, globalDefineFound->second);
}
else
{
Log(Debug::Error) << "Shader " << templateName << " error: Undefined " << define;
return false;
}
}
return true;
}
struct HotReloadManager
{
using KeysHolder = std::set<ShaderManager::MapKey>;
std::unordered_map<std::string, KeysHolder> mShaderFiles;
std::unordered_map<std::string, std::set<boost::filesystem::path>> templateIncludedFiles;
std::chrono::time_point<std::chrono::system_clock> mLastAutoRecompileTime;
bool mHotReloadEnabled;
bool mTriggerReload;
HotReloadManager()
{
mTriggerReload = false;
mHotReloadEnabled = false;
mLastAutoRecompileTime = std::chrono::system_clock::now();
}
void addShaderFiles(const std::string& templateName,const ShaderManager::DefineMap& defines )
{
const std::set<boost::filesystem::path>& shaderFiles = templateIncludedFiles[templateName];
for (const boost::filesystem::path& file : shaderFiles)
{
mShaderFiles[file.string()].insert(std::make_pair(templateName, defines));
}
}
void update(ShaderManager& Manager,osgViewer::Viewer& viewer)
{
auto timeSinceLastCheckMillis = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now() - mLastAutoRecompileTime);
if ((mHotReloadEnabled && timeSinceLastCheckMillis.count() > 200) || mTriggerReload == true)
{
reloadTouchedShaders(Manager, viewer);
}
mTriggerReload = false;
}
void reloadTouchedShaders(ShaderManager& Manager, osgViewer::Viewer& viewer)
{
bool threadsRunningToStop = false;
for (auto& [pathShaderToTest, shaderKeys]: mShaderFiles)
{
auto write_time = std::chrono::system_clock::from_time_t(boost::filesystem::last_write_time(pathShaderToTest));
if (write_time.time_since_epoch() > mLastAutoRecompileTime.time_since_epoch())
{
if (!threadsRunningToStop)
{
threadsRunningToStop = viewer.areThreadsRunning();
if (threadsRunningToStop)
viewer.stopThreading();
}
for (const auto& [templateName, shaderDefines]: shaderKeys)
{
ShaderManager::ShaderMap::iterator shaderIt = Manager.mShaders.find(std::make_pair(templateName, shaderDefines));
ShaderManager::TemplateMap::iterator templateIt = Manager.mShaderTemplates.find(templateName); //Can't be Null, if we're here it means the template was added
std::string& shaderSource = templateIt->second;
std::set<boost::filesystem::path> insertedPaths;
boost::filesystem::path path = (boost::filesystem::path(Manager.mPath) / templateName);
boost::filesystem::ifstream stream;
stream.open(path);
if (stream.fail())
{
Log(Debug::Error) << "Failed to open " << path.string();
}
std::stringstream buffer;
buffer << stream.rdbuf();
// parse includes
int fileNumber = 1;
std::string source = buffer.str();
if (!addLineDirectivesAfterConditionalBlocks(source)
|| !parseIncludes(boost::filesystem::path(Manager.mPath), source, templateName, fileNumber, {}, insertedPaths))
{
break;
}
shaderSource = source;
std::vector<std::string> linkedShaderNames;
if (!Manager.createSourceFromTemplate(shaderSource, linkedShaderNames, templateName, shaderDefines))
{
break;
}
shaderIt->second->setShaderSource(shaderSource);
}
}
}
if (threadsRunningToStop)
viewer.startThreading();
mLastAutoRecompileTime = std::chrono::system_clock::now();
}
};
osg::ref_ptr<osg::Shader> ShaderManager::getShader(const std::string &templateName, const ShaderManager::DefineMap &defines, osg::Shader::Type shaderType)
{
std::unique_lock<std::mutex> lock(mMutex);
// read the template if we haven't already
TemplateMap::iterator templateIt = mShaderTemplates.find(templateName);
std::set<boost::filesystem::path> insertedPaths;
if (templateIt == mShaderTemplates.end())
{
boost::filesystem::path path = (boost::filesystem::path(mPath) / templateName);
boost::filesystem::ifstream stream;
stream.open(path);
if (stream.fail())
{
Log(Debug::Error) << "Failed to open " << path.string();
return nullptr;
}
std::stringstream buffer;
buffer << stream.rdbuf();
// parse includes
int fileNumber = 1;
std::string source = buffer.str();
if (!addLineDirectivesAfterConditionalBlocks(source)
|| !parseIncludes(boost::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;
}
}