OpenSpace/modules/base/rotation/luarotation.cpp

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2024                                                               *
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#include <modules/base/rotation/luarotation.h>

#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <openspace/util/updatestructures.h>
#include <ghoul/filesystem/file.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/logging/logmanager.h>
#include <ghoul/lua/ghoul_lua.h>
#include <ghoul/lua/lua_helper.h>
#include <chrono>

namespace {
    constexpr openspace::properties::Property::PropertyInfo ScriptInfo = {
        "Script",
        "Script",
        "This value is the path to the Lua script that will be executed to compute the "
        "rotation for this transformation. The script needs to define a function "
        "'rotation' that takes the current simulation time in seconds past the J2000 "
        "epoch as the first argument, the current wall time as milliseconds past the "
        "J2000 epoch as the second argument and computes the rotation returned as 9 "
        "values",
        // @VISIBILITY(3.25)
        openspace::properties::Property::Visibility::AdvancedUser
    };

    struct [[codegen::Dictionary(LuaRotation)]] Parameters {
        // [[codegen::verbatim(ScriptInfo.description)]]
        std::string script;
    };
#include "luarotation_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation LuaRotation::Documentation() {
    return codegen::doc<Parameters>("base_transform_rotation_lua");
}

LuaRotation::LuaRotation()
    : _luaScriptFile(ScriptInfo)
    , _state(ghoul::lua::LuaState::IncludeStandardLibrary::No)
{
    addProperty(_luaScriptFile);

    _luaScriptFile.onChange([this]() {
        requireUpdate();
        _fileHandle = std::make_unique<ghoul::filesystem::File>(_luaScriptFile.value());
        _fileHandle->setCallback([this]() { requireUpdate(); });
    });
}

LuaRotation::LuaRotation(const ghoul::Dictionary& dictionary) : LuaRotation() {
    const Parameters p = codegen::bake<Parameters>(dictionary);

    _luaScriptFile = absPath(p.script).string();
}

glm::dmat3 LuaRotation::matrix(const UpdateData& data) const {
    ghoul::lua::runScriptFile(_state, _luaScriptFile.value());

    // Get the scaling function
    lua_getglobal(_state, "rotation");
    const bool isFunction = lua_isfunction(_state, -1);
    if (!isFunction) {
        LERRORC(
            "LuaRotation",
            std::format(
                "Script '{}' does not have a function 'rotation'", _luaScriptFile.value()
            )
        );
        return glm::dmat3(1.0);
    }

    // First argument is the number of seconds past the J2000 epoch in ingame time
    ghoul::lua::push(_state, data.time.j2000Seconds());

    // Second argument is the number of seconds past the J2000 epoch of the last frame
    ghoul::lua::push(_state, data.previousFrameTime.j2000Seconds());

    // Third argument is the number of milliseconds past the J2000 epoch in wallclock
    using namespace std::chrono;
    auto now = high_resolution_clock::now();
    ghoul::lua::push(_state, duration_cast<milliseconds>(now.time_since_epoch()).count());

    // Execute the scaling function
    const int success = lua_pcall(_state, 2, 9, 0);
    if (success != 0) {
        LERRORC(
            "LuaRotation",
            std::format("Error executing 'rotation': {}", lua_tostring(_state, -1))
        );
    }

    std::array<double, 9> values;
    for (int i = 0; i < 9; i++) {
        values[i] = luaL_checknumber(_state, -1 - i);
    }

    return glm::make_mat3(values.data());
}

} // namespace openspace