initial config file

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "thirdparty/dxbc"]
 	path = thirdparty/dxbc
 	url = https://github.com/PancakeTAS/dxbc.git
+[submodule "thirdparty/toml11"]
+	path = thirdparty/toml11
+	url = https://github.com/ToruNiina/toml11

CMakeLists.txt

@@ -16,8 +16,10 @@ add_compile_options(-fPIC
 
 add_subdirectory(thirdparty/dxbc EXCLUDE_FROM_ALL)
 add_subdirectory(thirdparty/pe-parse/pe-parser-library EXCLUDE_FROM_ALL)
+add_subdirectory(thirdparty/toml11 EXCLUDE_FROM_ALL)
 add_subdirectory(framegen)
 
+
 # main project
 project(lsfg-vk
     VERSION 0.0.1
@@ -41,7 +43,10 @@ set_target_properties(lsfg-vk PROPERTIES
 target_include_directories(lsfg-vk
     PRIVATE include)
 target_link_libraries(lsfg-vk PRIVATE
-    lsfg-vk-framegen pe-parse dxbc vulkan)
+    lsfg-vk-framegen pe-parse dxbc toml11 vulkan)
+
+get_target_property(TOML11_INCLUDE_DIRS toml11 INTERFACE_INCLUDE_DIRECTORIES)
+target_include_directories(lsfg-vk SYSTEM PRIVATE ${TOML11_INCLUDE_DIRS})
 
 if(CMAKE_BUILD_TYPE STREQUAL "Release")
     set_target_properties(lsfg-vk PROPERTIES

framegen/include/common/exception.hpp

@@ -2,6 +2,7 @@
 
 #include <vulkan/vulkan_core.h>
 
+#include <exception>
 #include <stdexcept>
 #include <string>
 
@@ -31,4 +32,31 @@ namespace LSFG {
         VkResult result;
     };
 
+    /// Simple exception class for stacking errors.
+    class rethrowable_error : public std::runtime_error {
+    public:
+        ///
+        /// Construct a new rethrowable_error with a message.
+        ///
+        /// @param message The error message.
+        /// @param exe The original exception to rethrow.
+        ///
+        explicit rethrowable_error(const std::string& message,
+            const std::exception& exe);
+
+        /// Get the exception as a string.
+        [[nodiscard]] const char* what() const noexcept override {
+            return message.c_str();
+        }
+
+        // Trivially copyable, moveable and destructible
+        rethrowable_error(const rethrowable_error&) = default;
+        rethrowable_error(rethrowable_error&&) = default;
+        rethrowable_error& operator=(const rethrowable_error&) = default;
+        rethrowable_error& operator=(rethrowable_error&&) = default;
+        ~rethrowable_error() noexcept override;
+    private:
+        std::string message;
+    };
+
 }

framegen/src/common/exception.cpp

@@ -2,6 +2,7 @@
 
 #include <vulkan/vulkan_core.h>
 
+#include <exception>
 #include <stdexcept>
 #include <cstdint>
 #include <format>
@@ -14,3 +15,10 @@ vulkan_error::vulkan_error(VkResult result, const std::string& message)
       result(result) {}
 
 vulkan_error::~vulkan_error() noexcept = default;
+
+rethrowable_error::rethrowable_error(const std::string& message, const std::exception& exe)
+        : std::runtime_error(message) {
+    this->message = std::format("{}\n- {}", message, exe.what());
+}
+
+rethrowable_error::~rethrowable_error() noexcept = default;

include/config/config.hpp

@@ -8,7 +8,7 @@
 
 namespace Config {
 
-    /// lsfg-vk configuration.
+    /// lsfg-vk configuration
     struct Configuration {
         /// Whether lsfg-vk should be loaded in the first place.
         bool enable{false};

src/config/config.cpp

@@ -1,15 +1,99 @@
 #include "config/config.hpp"
+#include "common/exception.hpp"
+
+#include <filesystem>
+#include <optional>
+#include <toml11/find.hpp>
+#include <toml11/parser.hpp>
+#include <toml.hpp>
+
+#include <unordered_map>
+#include <string_view>
+#include <exception>
+#include <stdexcept>
+#include <cstddef>
+#include <utility>
+#include <atomic>
+#include <memory>
+#include <string>
 
 using namespace Config;
 
-const Configuration defaultConf{
-    .enable = false
-};
+namespace {
+    Configuration globalConf{};
+    std::optional<std::unordered_map<std::string, Configuration>> gameConfs;
+}
 
 bool Config::loadAndWatchConfig(const std::string& file) {
+    // parse config file
+    toml::value toml{};
+    if (std::filesystem::exists(file)) {
+        try {
+            toml = toml::parse(file);
+        } catch (const std::exception& e) {
+            throw LSFG::rethrowable_error("Unable to parse configuration file", e);
+        }
+    }
+
+    // parse global configuration
+    auto& global = globalConf;
+    const toml::value globalTable = toml::find_or_default<toml::table>(toml, "global");
+    global.enable = toml::find_or(globalTable, "enable", false);
+    global.dll = toml::find_or(globalTable, "dll", std::string());
+    global.multiplier = toml::find_or(globalTable, "multiplier", size_t(2));
+    global.flowScale = toml::find_or(globalTable, "flow_scale", 1.0F);
+    global.performance = toml::find_or(globalTable, "performance_mode", false);
+    global.hdr = toml::find_or(globalTable, "hdr_mode", false);
+    global.valid = std::make_shared<std::atomic_bool>(true);
+
+    // validate global configuration
+    if (global.multiplier < 2)
+        throw std::runtime_error("Multiplier cannot be less than 2");
+    if (global.flowScale < 0.25F || global.flowScale > 1.0F)
+        throw std::runtime_error("Flow scale must be between 0.25 and 1.0");
+
+    // parse game-specific configuration
+    auto& games = gameConfs.emplace();
+    const toml::value gamesList = toml::find_or_default<toml::array>(toml, "game");
+    for (const auto& gameTable : gamesList.as_array()) {
+        if (!gameTable.is_table())
+            throw std::runtime_error("Invalid game configuration entry");
+        if (!gameTable.contains("exe"))
+            throw std::runtime_error("Game override missing 'exe' field");
+
+        const std::string exe = toml::find<std::string>(gameTable, "exe");
+        Configuration game{
+            .enable = toml::find_or(gameTable, "enable", global.enable),
+            .dll = toml::find_or(gameTable, "dll", global.dll),
+            .multiplier = toml::find_or(gameTable, "multiplier", global.multiplier),
+            .flowScale = toml::find_or(gameTable, "flow_scale", global.flowScale),
+            .performance = toml::find_or(gameTable, "performance_mode", global.performance),
+            .hdr = toml::find_or(gameTable, "hdr_mode", global.hdr),
+            .valid = global.valid // only need a single validity flag
+        };
+
+        // validate the configuration
+        if (game.multiplier < 2)
+            throw std::runtime_error("Multiplier cannot be less than 2");
+        if (game.flowScale < 0.25F || game.flowScale > 1.0F)
+            throw std::runtime_error("Flow scale must be between 0.25 and 1.0");
+        games[exe] = std::move(game);
+    }
+
+    // prepare config watcher
+    // (TODO)
+
     return false;
 }
 
 Configuration Config::getConfig(std::string_view name) {
-    return defaultConf;
+    if (name.empty() || !gameConfs.has_value())
+        return globalConf;
+
+    const auto& games = *gameConfs;
+    auto it = games.find(std::string(name));
+    if (it != games.end())
+        return it->second;
+
+    return globalConf;
 }

src/main.cpp

@@ -46,8 +46,8 @@ namespace {
             return{configFile};
         const char* homePath = std::getenv("HOME");
         if (homePath && *homePath != '\0')
-            return std::string(homePath) + "/.config/lsfg-vk.conf";
-        return "/etc/lsfg-vk.conf";
+            return std::string(homePath) + "/.config/lsfg-vk.toml";
+        return "/etc/lsfg-vk.toml";
     }
 
     __attribute__((constructor)) void lsfgvk_init() {
@@ -57,6 +57,7 @@ namespace {
                 exit(0);
             }
 
+            // TODO: health check, maybe?
             std::cerr << "lsfg-vk: This library is not meant to be preloaded, unless you are running a benchmark.\n";
             exit(1);
         }
@@ -66,8 +67,8 @@ namespace {
         try {
             Config::loadAndWatchConfig(file);
         } catch (const std::exception& e) {
-            std::cerr << "lsfg-vk: Unable to read configuration file, exiting." << '\n';
-            std::cerr << e.what() << '\n';
+            std::cerr << "lsfg-vk: An error occured while trying to parse the configuration, exiting:" << '\n';
+            std::cerr << "- " << e.what() << '\n';
             exit(0);
         }
 
@@ -87,10 +88,10 @@ namespace {
 
         // print config
         std::cerr << "lsfg-vk: Loaded configuration for " << name << ":\n";
-        std::cerr << "lsfg-vk: Using DLL from: " << conf.dll << '\n';
-        std::cerr << "lsfg-vk: Multiplier: " << conf.multiplier << '\n';
-        std::cerr << "lsfg-vk: Flow Scale: " << conf.flowScale << '\n';
-        std::cerr << "lsfg-vk: Performance Mode: " << (conf.performance ? "Enabled" : "Disabled") << '\n';
-        std::cerr << "lsfg-vk: HDR: " << (conf.hdr ? "Enabled" : "Disabled") << '\n';
+        if (!conf.dll.empty()) std::cerr << "  Using DLL from: " << conf.dll << '\n';
+        std::cerr << "  Multiplier: " << conf.multiplier << '\n';
+        std::cerr << "  Flow Scale: " << conf.flowScale << '\n';
+        std::cerr << "  Performance Mode: " << (conf.performance ? "Enabled" : "Disabled") << '\n';
+        std::cerr << "  HDR Mode: " << (conf.hdr ? "Enabled" : "Disabled") << '\n';
     }
 }

thirdparty/toml11

@@ -0,0 +1 @@
+Subproject commit be08ba2be2a964edcdb3d3e3ea8d100abc26f286