OpenSpace/modules/base/rotation/luarotation.cpp

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 * OpenSpace                                                                             *
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#include <modules/base/rotation/luarotation.h>

#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <openspace/engine/globals.h>
#include <openspace/scripting/scriptengine.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 simulation time in seconds past the J2000 "
        "epoch of the last frame as the second argument, and the current wall time as "
        "milliseconds past the J2000 epoch as the third argument. It computes the "
        "rotation value factors returned as a table containing the 9 values that make up "
        "the resulting rotation matrix.",
        openspace::properties::Property::Visibility::AdvancedUser
    };

    // This `Rotation` type generates the rotation for the attached scene graph node by
    // calling the provided Lua script to create the full matrix used to orient the scene
    // graph node. The returned matrix must be a valid rotation matrix. The script
    // parameter describes in greater detail how the Lua script file should be
    // constructed.
    struct [[codegen::Dictionary(LuaRotation)]] Parameters {
        // [[codegen::verbatim(ScriptInfo.description)]]
        std::filesystem::path script;
    };
#include "luarotation_codegen.cpp"
} // namespace

namespace openspace {

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

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

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

    addProperty(_luaScriptFile);
    global::scriptEngine->initializeLuaState(_state);

    _luaScriptFile = 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, 3, 1, 0);
    if (success != 0) {
        LERRORC(
            "LuaRotation",
            std::format("Error executing 'rotation': {}", lua_tostring(_state, -1))
        );
    }
    const glm::dmat3 rotation = ghoul::lua::value<glm::dmat3>(_state);
    return rotation;
}

} // namespace openspace