add gui.get_active_frame, set_active_frame & update cursor lock behavior

res/scripts/hud.lua

@@ -127,11 +127,11 @@ function on_hud_open()
 
     hud.default_hand_controller = update_hand
 
-    local name = "gui/no_icon"
-    gui.create_frame(name, {16, 16})
+    local name = "misc/moon"
+    gui.create_frame(name, name, {128, 128})
 
     local document = Document.new(name)
-    document.root:add("<label>Hello</label>")
+    document.root:add("<button>Hello, World</button>")
     document.root.color = {255, 0, 0, 255}
 end
 

res/scripts/stdlib.lua

@@ -232,6 +232,7 @@ _GUI_ROOT = Document.new("core:root")
 _MENU = _GUI_ROOT.menu
 menu = _MENU
 gui.root = _GUI_ROOT
+gui.main_frame_id = "core:main"
 
 do
     local status, err = pcall(function()
@@ -435,6 +436,7 @@ function __vc_on_hud_open()
         if menu.page ~= "" then
             if not menu:back() then
                 menu:reset()
+                gui.set_active_frame("")
             end
         elseif hud.is_inventory_open() then
             hud.close_inventory()

src/engine/Engine.cpp

@@ -302,10 +302,12 @@ void Engine::startPauseLoop() {
 }
 
 void Engine::renderFrame() {
+    if (input->isCursorLocked() != (gui->getActiveFrame() == nullptr)) {
+        input->toggleCursor();
+    }
     screen->draw(time.getDelta());
 
     DrawContext ctx(nullptr, *window, nullptr);
-    gui->renderFrames(ctx, *assets->getStorage());
     gui->draw(ctx, *assets->getStorage());
 }
 

src/frontend/hud.cpp

@@ -207,9 +207,6 @@ Hud::Hud(Engine& engine, LevelFrontend& frontend, Player& player)
 }
 
 Hud::~Hud() {
-    if (input.isCursorLocked()) {
-        input.toggleCursor();
-    }
     // removing all controlled ui
     for (auto& element : elements) {
         onRemove(element);
@@ -342,9 +339,6 @@ void Hud::update(bool visible) {
     if (!gui.isFocusCaught()) {
         processInput(visible);
     }
-    if ((isMenuOpen || inventoryOpen) == input.isCursorLocked()) {
-        input.toggleCursor();
-    }
 
     if (blockUI) {
         voxel* vox = chunks.get(blockPos.x, blockPos.y, blockPos.z);
@@ -395,6 +389,7 @@ void Hud::openInventory(bool playerInventory) {
         inventoryView->bind(inventory, &content);
         add(HudElement(HudElementMode::INVENTORY, inventoryDocument, inventoryView, false));
     }
+    gui.setActiveFrame(GUI::CORE_MAIN);
 }
 
 std::shared_ptr<Inventory> Hud::openInventory(
@@ -548,6 +543,7 @@ void Hud::closeInventory() {
         }
     }
     cleanup();
+    gui.setActiveFrame("");
 }
 
 void Hud::add(const HudElement& element, const dv::value& argsArray) {
@@ -710,9 +706,11 @@ void Hud::setPause(bool pause) {
     
     if (!pause && menu.hasOpenPage()) {
         menu.reset();
+        gui.setActiveFrame("");
     }
     if (pause && !menu.hasOpenPage()) {
         menu.setPage("pause");
+        gui.setActiveFrame(GUI::CORE_MAIN);
     }
 }
 

src/frontend/screens/LevelScreen.cpp

@@ -56,6 +56,7 @@ LevelScreen::LevelScreen(
     auto& assets = *engine.getAssets();
     auto menu = engine.getGUI().getMenu();
     menu->reset();
+    gui.setActiveFrame("");
 
     auto player = level->players->get(localPlayer);
     assert(player != nullptr);

src/graphics/ui/GUI.cpp

@@ -1,10 +1,10 @@
 #include "GUI.hpp"
 
 #include <algorithm>
-#include <iostream>
 #include <utility>
 
 #include "assets/Assets.hpp"
+#include "debug/Logger.hpp"
 #include "elements/Label.hpp"
 #include "elements/Menu.hpp"
 #include "elements/Panel.hpp"
@@ -27,13 +27,15 @@
 #include <algorithm>
 #include <utility>
 
+static debug::Logger logger("gui");
+
 using namespace gui;
 
 GUI::GUI(Engine& engine)
     : engine(engine),
       input(engine.getInput()),
       batch2D(std::make_unique<Batch2D>(1024)),
-      container(std::make_shared<Container>(*this, glm::vec2(1000))) {
+      container(std::make_shared<Frame>(*this, CORE_MAIN, "")) {
     container->setId("root");
     uicamera =
         std::make_unique<Camera>(glm::vec3(), engine.getWindow().getSize().y);
@@ -64,6 +66,8 @@ GUI::GUI(Engine& engine)
         std::dynamic_pointer_cast<gui::UINode>(container),
         nullptr
     );
+    addFrame(container);
+    activeFrame = container;
 }
 
 GUI::~GUI() = default;
@@ -118,7 +122,9 @@ void GUI::updateTooltip(float delta) {
 }
 
 /// @brief Mouse related input and logic handling
-void GUI::actMouse(float delta, const CursorState& cursor) {
+void GUI::actMouse(Frame& frame, float delta, const CursorState& cursor) {
+    auto& state = frame.getState();
+
     float mouseDelta = glm::length(cursor.delta);
     doubleClicked = false;
     doubleClickTimer += delta + mouseDelta * 0.1f;
@@ -158,13 +164,13 @@ void GUI::actMouse(float delta, const CursorState& cursor) {
     }
 
     for (auto it = mouseOver.begin(); it != mouseOver.end(); ) {
-        auto node = it->lock();
-        if (node) {
-            if (node->isInside(cursor.pos)) {
+        auto mouseOverNode = it->lock();
+        if (mouseOverNode) {
+            if (mouseOverNode->isInside(cursor.pos)) {
                 ++it;
                 continue;
             }
-            node->setMouseOver(false);
+            mouseOverNode->setMouseOver(false);
         }
         it = mouseOver.erase(it);
     }
@@ -233,14 +239,16 @@ void GUI::actFocused() {
 
 void GUI::act(float delta, const glm::uvec2& vp) {
     container->setSize(vp);
-    container->act(delta);
+    for (auto& pair : frames) {
+        pair.second->act(delta);
+    }
     auto prevfocus = focus;
 
     updateTooltip(delta);
 
     const auto& cursor = input.getCursor();
-    if (!cursor.locked) {
-        actMouse(delta, cursor);
+    if (!cursor.locked && activeFrame) {
+        actMouse(*activeFrame, delta, cursor);
     } else {
         if (hover) {
             hover->setMouseEnter(false);
@@ -263,22 +271,7 @@ void GUI::postAct() {
     }
 }
 
-void GUI::renderFrames(const DrawContext& pctx, Assets& assets) {
-    auto ctx = pctx.sub(batch2D.get());
-
-    auto uishader = assets.get<Shader>("ui");
-    uishader->use();
-    uishader->uniformMatrix("u_projview", uicamera->getProjView());
-
-    batch2D->begin();
-    for (auto& [outputTexture, frame] : frames) {
-        frame->updateOutput(assets);
-        frame->draw(ctx, assets);
-    }
-    batch2D->flush();
-}
-
-void GUI::draw(const DrawContext& pctx, const Assets& assets) {
+void GUI::draw(const DrawContext& pctx, Assets& assets) {
     auto ctx = pctx.sub(batch2D.get());
 
     auto& viewport = ctx.getViewport();
@@ -300,7 +293,10 @@ void GUI::draw(const DrawContext& pctx, const Assets& assets) {
     uishader->uniformMatrix("u_projview", uicamera->getProjView());
 
     batch2D->begin();
-    container->draw(ctx, assets);
+    for (auto& [outputTexture, frame] : frames) {
+        frame->updateOutput(assets);
+        frame->draw(ctx, assets);
+    }
 
     if (hover) {
         engine.getWindow().setCursor(hover->getCursor());
@@ -354,7 +350,26 @@ void GUI::add(std::shared_ptr<UINode> node) {
 }
 
 void GUI::addFrame(std::shared_ptr<Frame> frame) {
-    frames[frame->getOutputTexture()] = std::move(frame);
+    const auto& id = frame->getFrameId();
+    frames[id] = std::move(frame);
+}
+
+void GUI::setActiveFrame(const std::string& id) {
+    if (id.empty()) {
+        activeFrame = nullptr;
+        return;
+    }
+    const auto& found = frames.find(id);
+    if (found == frames.end()) {
+        logger.error() << "attempted to make non-existing frame '" << id
+                       << "' as active";
+        return;
+    }
+    activeFrame = found->second;
+}
+
+std::shared_ptr<gui::Frame> GUI::getActiveFrame() const {
+    return activeFrame;
 }
 
 void GUI::remove(UINode* node) noexcept {

src/graphics/ui/GUI.hpp

@@ -68,7 +68,7 @@ namespace gui {
         Engine& engine;
         Input& input;
         std::unique_ptr<Batch2D> batch2D;
-        std::shared_ptr<Container> container;
+        std::shared_ptr<Frame> container;
         std::shared_ptr<UINode> hover;
         std::shared_ptr<UINode> pressed;
         std::shared_ptr<UINode> focus;
@@ -76,6 +76,7 @@ namespace gui {
         std::shared_ptr<UiDocument> rootDocument;
         std::unique_ptr<FontStylesScheme> syntaxColorScheme;
         std::unordered_map<std::string, std::shared_ptr<UINode>> storage;
+        std::shared_ptr<Frame> activeFrame;
 
         std::unique_ptr<Camera> uicamera;
         std::shared_ptr<Menu> menu;
@@ -89,11 +90,12 @@ namespace gui {
         bool doubleClicked = false;
         bool debug = false;
 
-        void actMouse(float delta, const CursorState& cursor);
+        void actMouse(Frame& frame, float delta, const CursorState& cursor);
         void actFocused();
         void updateTooltip(float delta);
         void resetTooltip();
     public:
+        static inline std::string CORE_MAIN = "core:main";
         static constexpr int CONTEXT_MENU_ZINDEX = 999;
 
         GUI(Engine& engine);
@@ -114,12 +116,10 @@ namespace gui {
         /// @param viewport window size
         void act(float delta, const glm::uvec2& viewport);
 
-        void renderFrames(const DrawContext& pctx, Assets& assets);
-
         /// @brief Draw all visible elements on main container 
         /// @param pctx parent graphics context
         /// @param assets active assets storage
-        void draw(const DrawContext& pctx, const Assets& assets);
+        void draw(const DrawContext& pctx, Assets& assets);
 
         void postAct();
 
@@ -129,6 +129,10 @@ namespace gui {
 
         void addFrame(std::shared_ptr<Frame> frame);
 
+        void setActiveFrame(const std::string& id);
+
+        std::shared_ptr<Frame> getActiveFrame() const;
+
         /// @brief Remove node from the main container
         void remove(UINode* node) noexcept;
 

src/graphics/ui/elements/Frame.cpp

@@ -13,15 +13,20 @@ using namespace gui;
 
 static inline constexpr int MAX_TEXTURE_SIZE = 2048;
 
-gui::Frame::Frame(GUI& gui, std::string outputTexture)
+gui::Frame::Frame(GUI& gui, std::string id, std::string outputTexture)
     : Container(gui, {}),
       fbo(nullptr),
       outputTexture(std::move(outputTexture)) {
+    frameId = std::move(id);
 }
 
 gui::Frame::~Frame() = default;
 
 void gui::Frame::draw(const DrawContext& pctx, const Assets& assets) {
+    if (outputTexture.empty()) {
+        Container::draw(pctx, assets);
+        return;
+    }
     if (fbo == nullptr) {
         return;
     }
@@ -53,3 +58,11 @@ void gui::Frame::updateOutput(Assets& assets) {
 const std::string& gui::Frame::getOutputTexture() const {
     return outputTexture;
 }
+
+const std::string& gui::Frame::getFrameId() const {
+    return frameId;
+}
+
+gui::Frame::State& gui::Frame::getState() {
+    return state;
+}

src/graphics/ui/elements/Frame.hpp

@@ -8,7 +8,10 @@ class UiDocument;
 namespace gui {
     class Frame final : public Container {
     public:
-        Frame(GUI& gui, std::string outputTexture);
+        struct State {
+        };
+
+        Frame(GUI& gui, std::string id, std::string outputTexture);
         virtual ~Frame();
 
         void draw(const DrawContext& pctx, const Assets& assets) override;
@@ -16,7 +19,14 @@ namespace gui {
         void updateOutput(Assets& assets);
 
         const std::string& getOutputTexture() const;
+
+        const std::string& getFrameId() const;
+
+        /// @brief Frame state is controlled in gui::GUI
+        State& getState();
     private:
+        std::string frameId;
+        State state {};
         std::unique_ptr<Framebuffer> fbo;
         std::string outputTexture;
     };

src/graphics/ui/gui_util.cpp

@@ -78,6 +78,7 @@ void guiutil::alert(
     }));
     menu.addPage("<alert>", panel, true);
     menu.setPage("<alert>");
+    gui.setActiveFrame(GUI::CORE_MAIN);
 }
 
 void guiutil::confirm(
@@ -155,6 +156,7 @@ void guiutil::confirm(
     panel->refresh();
     menu->addPage("<confirm>", container, true);
     menu->setPage("<confirm>");
+    gui.setActiveFrame(GUI::CORE_MAIN);
 }
 
 void guiutil::confirm_with_memo(
@@ -201,4 +203,5 @@ void guiutil::confirm_with_memo(
     panel->refresh();
     menu->addPage("<confirm>", panel, true);
     menu->setPage("<confirm>");
+    gui.setActiveFrame(GUI::CORE_MAIN);
 }

src/logic/scripting/lua/libs/libgui.cpp

@@ -1154,21 +1154,44 @@ static int l_create_frame(lua::State* L) {
     if (engine->isHeadless()) {
         return 0;
     }
-    std::string outputTexture = lua::require_string(L, 1);
-    auto size = lua::tovec2(L, 2);
+    std::string id = lua::require_string(L, 1);
+    std::string outputTexture = lua::require_string(L, 2);
+    auto size = lua::tovec2(L, 3);
 
     auto& gui = engine->getGUI();
-    auto frame = std::make_shared<gui::Frame>(gui, outputTexture);
+    auto frame = std::make_shared<gui::Frame>(gui, id, outputTexture);
     frame->setSize(std::move(size));
     auto& assets = *engine->getAssets();
     auto document = std::make_shared<UiDocument>(
-        outputTexture, UiDocScript {}, frame, nullptr
+        id, UiDocScript {}, frame, nullptr
     );
-    assets.store(document, document->getId());
+    assets.store(document, id);
     gui.addFrame(std::move(frame));
     return 0;
 }
 
+static int l_set_active_frame(lua::State* L) {
+    if (engine->isHeadless()) {
+        return 0;
+    }
+    std::string id = lua::require_string(L, 1);
+    auto& gui = engine->getGUI();
+    gui.setActiveFrame(id);
+    return 0;
+}
+
+static int l_get_active_frame(lua::State* L) {
+    if (engine->isHeadless()) {
+        return 0;
+    }
+    auto& gui = engine->getGUI();
+    auto frame = gui.getActiveFrame();
+    if (frame == nullptr) {
+        return 0;
+    }
+    return lua::pushstring(L, frame->getId());
+}
+
 const luaL_Reg guilib[] = {
     {"get_viewport", lua::wrap<l_gui_getviewport>},
     {"getattr", lua::wrap<l_gui_getattr>},
@@ -1183,6 +1206,8 @@ const luaL_Reg guilib[] = {
     {"load_document", lua::wrap<l_gui_load_document>},
     {"set_syntax_styles", lua::wrap<l_set_syntax_styles>},
     {"create_frame", lua::wrap<l_create_frame>},
+    {"set_active_frame", lua::wrap<l_set_active_frame>},
+    {"get_active_frame", lua::wrap<l_get_active_frame>},
     {"__reindex", lua::wrap<l_gui_reindex>},
     {nullptr, nullptr}
 };