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#ifndef OPENMW_COMPONENTS_SETTINGS_SHADERMANAGER_H
#define OPENMW_COMPONENTS_SETTINGS_SHADERMANAGER_H
#include <filesystem>
#include <fstream>
#include <optional>
#include <unordered_map>
#include <vector>
#include <yaml-cpp/yaml.h>
#include <osg/Vec2f>
#include <osg/Vec3f>
#include <osg/Vec4f>
#include <components/debug/debuglog.hpp>
#include <components/files/conversion.hpp>
#include <components/serialization/osgyaml.hpp>
namespace Settings
{
/*
* Manages the shader.yaml file which is auto-generated and lives next to settings.cfg.
* This YAML file is simply a mapping of technique name to a list of uniforms and their values.
* Currently only vec2f, vec3f, vec4f, int, and float uniforms are supported.
*
* config:
* TECHNIQUE:
* MY_FLOAT: 10.34
* MY_VEC2: [0.23, 0.34]
* TECHNIQUE2:
* MY_VEC3: [0.22, 0.33, 0.20]
*/
class ShaderManager
{
public:
enum class Mode
{
Normal,
Debug
};
ShaderManager() = default;
ShaderManager(ShaderManager const&) = delete;
void operator=(ShaderManager const&) = delete;
static ShaderManager& get()
{
static ShaderManager instance;
return instance;
}
Mode getMode() { return mMode; }
void setMode(Mode mode) { mMode = mode; }
const YAML::Node& getRoot() { return mData; }
template <class T>
bool setValue(const std::string& tname, const std::string& uname, const T& value)
{
if (mData.IsNull())
{
Log(Debug::Warning) << "Failed setting " << tname << ", " << uname
<< " : shader settings failed to load";
return false;
}
mData["config"][tname][uname] = value;
return true;
}
template <class T>
std::optional<T> getValue(const std::string& tname, const std::string& uname)
{
if (mData.IsNull())
{
Log(Debug::Warning) << "Failed getting " << tname << ", " << uname
<< " : shader settings failed to load";
return std::nullopt;
}
try
{
auto value = mData["config"][tname][uname];
if (!value)
return std::nullopt;
return value.as<T>();
}
catch (const YAML::BadConversion&)
{
Log(Debug::Warning) << "Failed retrieving " << tname << ", " << uname
<< " : mismatched types in config file.";
}
return std::nullopt;
}
bool load(const std::filesystem::path& path)
{
mData = YAML::Null;
mPath = path;
Log(Debug::Info) << "Loading shader settings file: " << mPath;
if (!std::filesystem::exists(mPath))
{
std::ofstream fout(mPath);
if (!fout)
{
Log(Debug::Error) << "Failed creating shader settings file: " << mPath;
return false;
}
}
try
{
std::ifstream file{ mPath };
mData = YAML::Load(file);
mData.SetStyle(YAML::EmitterStyle::Block);
if (!mData["config"])
mData["config"] = YAML::Node();
return true;
}
catch (const YAML::Exception& e)
{
Log(Debug::Error) << "Shader settings failed to load, " << e.msg;
}
return false;
}
bool save()
{
if (mData.IsNull())
{
Log(Debug::Error) << "Shader settings failed to load, settings will not be saved: " << mPath;
return false;
}
Log(Debug::Info) << "Saving shader settings file: " << mPath;
YAML::Emitter out;
out.SetMapFormat(YAML::Block);
out << mData;
std::ofstream fout(mPath);
fout << out.c_str();
if (!fout)
{
Log(Debug::Error) << "Failed saving shader settings file: " << mPath;
return false;
}
return true;
}
private:
std::filesystem::path mPath;
YAML::Node mData;
Mode mMode = Mode::Normal;
};
}
#endif
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