Add canvas UI node

doc/en/scripting/ui.md

@@ -156,6 +156,25 @@ Properties:
 | ----- | ------ | ---- | ----- | ------------ |
 | src   | string | yes  | yes   | texture name |
 
+## Canvas
+
+Properties:
+
+| Title | Type   | Read | Write | Description |
+|-------|--------| ---- |-------|-------------|
+| data  | Canvas | yes  | no    | canvas data |
+
+Methods:
+
+| Method                                                   | Description                                             |
+|----------------------------------------------------------|---------------------------------------------------------|
+| data:at(x: int, y: int)                                  | returns an RGBA pixel at the given coordinates          |
+| data:set(x: int, y: int, rgba: int)                      | updates an RGBA pixel at the given coordinates          |
+| data:set(x: int, y: int, r: int, g: int, b: int)         | updates an RGBA pixel at the given coordinates          |
+| data:set(x: int, y: int, r: int, g: int, b: int, a: int) | updates an RGBA pixel at the given coordinates          |
+| data:update()                                            | applies changes to the canvas and uploads it to the GPU |
+
+
 ## Inventory
 
 Properties:

doc/en/xml-ui-layouts.md

@@ -97,7 +97,11 @@ Inner text is a button text.
 - `src` - name of an image stored in textures folder. Extension is not specified. Type: string.
   Example: *gui/error*
 
-  ## *textbox*
+## *canvas*
+
+- _No additional attributes_
+
+## *textbox*
 
 Inner text - initially entered text
 

doc/ru/scripting/ui.md

@@ -156,6 +156,25 @@ document["worlds-panel"]:clear()
 | -------- | ------ | ------ | ------ | --------------------- |
 | src      | string | да     | да     | отображаемая текстура |
 
+
+## Холст (canvas)
+
+Свойства:
+
+| Название | Тип    | Чтение | Запись | Описание       |
+|----------|--------| ------ |--------|----------------|
+| data     | Canvas | да     | нет    | пиксели холста |
+
+Методы:
+
+| Метод                                                    | Описание                                            |
+|----------------------------------------------------------|-----------------------------------------------------|
+| data:at(x: int, y: int)                                  | возвращает RGBA пиксель по указанным координатам    |
+| data:set(x: int, y: int, rgba: int)                      | изменяет RGBA пиксель по указанным координатам      |
+| data:set(x: int, y: int, r: int, g: int, b: int)         | изменяет RGBA пиксель по указанным координатам      |
+| data:set(x: int, y: int, r: int, g: int, b: int, a: int) | изменяет RGBA пиксель по указанным координатам      |
+| data:update()                                            | применяет изменения и загружает холст в видеопамять |
+
 ## Inventory (inventory)
 
 Свойства:

doc/ru/xml-ui-layouts.md

@@ -98,6 +98,10 @@
 
 - `src` - имя изображения в папке textures без указания расширения. Тип: строка. Например `gui/error`
 
+## Холст - *canvas*
+
+- _Нет дополнительных свойств_
+
 ## Текстовое поле - *textbox*
 
 Внутренний текст - изначально введенный текст

src/graphics/ui/elements/Canvas.cpp

@@ -0,0 +1,19 @@
+#include "Canvas.hpp"
+
+#include "graphics/core/Batch2D.hpp"
+#include "graphics/core/DrawContext.hpp"
+#include "graphics/core/Texture.hpp"
+
+gui::Canvas::Canvas(ImageFormat inFormat, glm::uvec2 inSize) : UINode(inSize) {
+    ImageData data {inFormat, inSize.x, inSize.y};
+    mTexture = Texture::from(&data);
+}
+
+void gui::Canvas::draw(const DrawContext& pctx, const Assets& assets) {
+    auto pos = calcPos();
+    auto col = calcColor();
+
+    auto batch = pctx.getBatch2D();
+    batch->texture(mTexture.get());
+    batch->rect(pos.x, pos.y, size.x, size.y, 0, 0, 0, {}, false, true, col);
+}

src/graphics/ui/elements/Canvas.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "UINode.hpp"
+#include "graphics/core/ImageData.hpp"
+#include "graphics/core/Texture.hpp"
+
+class Texture;
+
+namespace gui {
+    class Canvas final : public UINode {
+    public:
+        explicit Canvas(ImageFormat inFormat, glm::uvec2 inSize);
+
+        ~Canvas() override = default;
+
+        void draw(const DrawContext& pctx, const Assets& assets) override;
+
+        [[nodiscard]] std::shared_ptr<::Texture> texture() const {
+            return mTexture;
+        }
+    private:
+        std::shared_ptr<::Texture> mTexture;
+        std::unique_ptr<ImageData> mData;
+    };
+}

src/graphics/ui/gui_xml.cpp

@@ -4,6 +4,7 @@
 #include "elements/Image.hpp"
 #include "elements/Menu.hpp"
 #include "elements/Button.hpp"
+#include "elements/Canvas.hpp"
 #include "elements/CheckBox.hpp"
 #include "elements/TextBox.hpp"
 #include "elements/TrackBar.hpp"
@@ -455,6 +456,18 @@ static std::shared_ptr<UINode> readImage(
     return image;
 }
 
+static std::shared_ptr<UINode> readCanvas(
+    const UiXmlReader& reader, const xml::xmlelement& element
+) {
+    auto size = glm::uvec2{32, 32};
+    if (element.has("size")) {
+        size = element.attr("size").asVec2();
+    }
+    auto image = std::make_shared<Canvas>(ImageFormat::rgba8888, size);
+    _readUINode(reader, element, *image);
+    return image;
+}
+
 static std::shared_ptr<UINode> readTrackBar(
     const UiXmlReader& reader, const xml::xmlelement& element
 ) {
@@ -634,6 +647,7 @@ static std::shared_ptr<UINode> readPageBox(UiXmlReader& reader, const xml::xmlel
 UiXmlReader::UiXmlReader(const scriptenv& env) : env(env) {
     contextStack.emplace("");
     add("image", readImage);
+    add("canvas", readCanvas);
     add("label", readLabel);
     add("panel", readPanel);
     add("button", readButton);

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

@@ -3,6 +3,7 @@
 #include "engine/Engine.hpp"
 #include "frontend/locale.hpp"
 #include "graphics/ui/elements/Button.hpp"
+#include "graphics/ui/elements/Canvas.hpp"
 #include "graphics/ui/elements/CheckBox.hpp"
 #include "graphics/ui/elements/Image.hpp"
 #include "graphics/ui/elements/InventoryView.hpp"
@@ -323,6 +324,13 @@ static int p_get_src(UINode* node, lua::State* L) {
     return 0;
 }
 
+static int p_get_data(UINode* node, lua::State* L) {
+    if (auto canvas = dynamic_cast<Canvas*>(node)) {
+        return lua::newuserdata<lua::LuaCanvas>(L, canvas->texture());
+    }
+    return 0;
+}
+
 static int p_get_add(UINode* node, lua::State* L) {
     if (dynamic_cast<Container*>(node)) {
         return lua::pushcfunction(L, lua::wrap<l_container_add>);
@@ -464,6 +472,7 @@ static int l_gui_getattr(lua::State* L) {
             {"inventory", p_get_inventory},
             {"focused", p_get_focused},
             {"cursor", p_get_cursor},
+            {"data", p_get_data},
         };
     auto func = getters.find(attr);
     if (func != getters.end()) {

src/logic/scripting/lua/lua_custom_types.hpp

@@ -8,6 +8,8 @@
 struct fnl_state;
 class Heightmap;
 class VoxelFragment;
+class Texture;
+class ImageData;
 
 namespace lua {
     class Userdata {
@@ -90,4 +92,25 @@ namespace lua {
         inline static std::string TYPENAME = "VoxelFragment";
     };
     static_assert(!std::is_abstract<LuaVoxelFragment>());
+
+    class LuaCanvas : public Userdata {
+    public:
+        explicit LuaCanvas(std::shared_ptr<Texture> inTexture);
+        ~LuaCanvas() override = default;
+
+        const std::string& getTypeName() const override {
+            return TYPENAME;
+        }
+
+        [[nodiscard]] Texture& texture() const { return *mTexture; }
+
+        [[nodiscard]] ImageData& data() const { return *mData; }
+
+        static int createMetatable(lua::State*);
+        inline static std::string TYPENAME = "Canvas";
+    private:
+        std::shared_ptr<Texture> mTexture;
+        std::unique_ptr<ImageData> mData;
+    };
+    static_assert(!std::is_abstract<LuaCanvas>());
 }

src/logic/scripting/lua/lua_engine.cpp

@@ -115,6 +115,7 @@ void lua::init_state(State* L, StateType stateType) {
     newusertype<LuaBytearray>(L);
     newusertype<LuaHeightmap>(L);
     newusertype<LuaVoxelFragment>(L);
+    newusertype<LuaCanvas>(L);
 }
 
 void lua::initialize(const EnginePaths& paths, const CoreParameters& params) {

src/logic/scripting/lua/lua_util.hpp

@@ -274,7 +274,7 @@ namespace lua {
     inline int newuserdata(lua::State* L, Args&&... args) {
         const auto& found = usertypeNames.find(typeid(T));
         void* ptr = lua_newuserdata(L, sizeof(T));
-        new (ptr) T(args...);
+        new (ptr) T(std::forward<Args>(args)...);
 
         if (found == usertypeNames.end()) {
             log_error(

src/logic/scripting/lua/usertypes/lua_type_canvas.cpp

@@ -0,0 +1,140 @@
+#include <unordered_map>
+
+#include "graphics/core/ImageData.hpp"
+#include "graphics/core/Texture.hpp"
+#include "logic/scripting/lua/lua_custom_types.hpp"
+#include "logic/scripting/lua/lua_util.hpp"
+
+using namespace lua;
+
+LuaCanvas::LuaCanvas(std::shared_ptr<Texture> inTexture)
+    : mTexture(std::move(inTexture)) {
+    mData = mTexture->readData();
+}
+
+union RGBA {
+    uint8_t rgba[4];
+    uint32_t raw;
+};
+
+static RGBA* get_at(const ImageData& data, uint index) {
+    if (index >= data.getWidth() * data.getHeight()) {
+        return nullptr;
+    }
+    return reinterpret_cast<RGBA*>(data.getData() + index * sizeof(RGBA));
+}
+
+static RGBA* get_at(const ImageData& data, uint x, uint y) {
+    return get_at(data, y * data.getWidth() + x);
+}
+
+static RGBA* get_at(State* L, uint x, uint y) {
+    if (auto texture = touserdata<LuaCanvas>(L, 1)) {
+        return get_at(texture->data(), x, y);
+    }
+    return nullptr;
+}
+
+static int l_at(State* L) {
+    auto x = static_cast<uint>(tonumber(L, 2));
+    auto y = static_cast<uint>(tonumber(L, 3));
+
+    if (auto pixel = get_at(L, x, y)) {
+        return pushnumber(L, pixel->raw);
+    }
+
+    return 0;
+}
+
+static int l_set(State* L) {
+    auto x = static_cast<uint>(tonumber(L, 2));
+    auto y = static_cast<uint>(tonumber(L, 3));
+
+    if (auto pixel = get_at(L, x, y)) {
+        switch (gettop(L)) {
+            case 4:
+                pixel->raw = static_cast<uint>(tonumber(L, 4));
+                return 1;
+            case 6:
+                pixel->rgba[0] = static_cast<ubyte>(tonumber(L, 4));
+                pixel->rgba[1] = static_cast<ubyte>(tonumber(L, 5));
+                pixel->rgba[2] = static_cast<ubyte>(tonumber(L, 6));
+                pixel->rgba[3] = 255;
+                return 1;
+            case 7:
+                pixel->rgba[0] = static_cast<ubyte>(tonumber(L, 4));
+                pixel->rgba[1] = static_cast<ubyte>(tonumber(L, 5));
+                pixel->rgba[2] = static_cast<ubyte>(tonumber(L, 6));
+                pixel->rgba[3] = static_cast<ubyte>(tonumber(L, 7));
+                return 1;
+            default:
+                return 0;
+        }
+    }
+
+    return 0;
+}
+
+static int l_update(State* L) {
+    if (auto texture = touserdata<LuaCanvas>(L, 1)) {
+        texture->texture().reload(texture->data());
+    }
+    return 0;
+}
+
+static std::unordered_map<std::string, lua_CFunction> methods {
+    {"at", lua::wrap<l_at>},
+    {"set", lua::wrap<l_set>},
+    {"update", lua::wrap<l_update>}
+};
+
+static int l_meta_index(State* L) {
+    auto texture = touserdata<LuaCanvas>(L, 1);
+    if (texture == nullptr) {
+        return 0;
+    }
+    auto& data = texture->data();
+    if (isnumber(L, 2)) {
+        if (auto pixel = get_at(data, static_cast<uint>(tonumber(L, 2)))) {
+            return pushinteger(L, pixel->raw);
+        }
+    }
+    if (isstring(L, 2)) {
+        auto name = tostring(L, 2);
+        if (!strcmp(name, "width")) {
+            return pushinteger(L, data.getWidth());
+        }
+        if (!strcmp(name, "height")) {
+            return pushinteger(L, data.getHeight());
+        }
+        if (auto func = methods.find(tostring(L, 2)); func != methods.end()) {
+            return pushcfunction(L, func->second);
+        }
+    }
+    return 0;
+}
+
+static int l_meta_newindex(State* L) {
+    auto texture = touserdata<LuaCanvas>(L, 1);
+    if (texture == nullptr) {
+        return 0;
+    }
+    auto& data = texture->data();
+    if (isnumber(L, 2) && isnumber(L, 3)) {
+        if (auto pixel = get_at(data, static_cast<uint>(tonumber(L, 2)))) {
+            pixel->raw = static_cast<uint>(tonumber(L, 3));
+            return 1;
+        }
+        return 1;
+    }
+    return 0;
+}
+
+int LuaCanvas::createMetatable(State* L) {
+    createtable(L, 0, 3);
+    pushcfunction(L, lua::wrap<l_meta_index>);
+    setfield(L, "__index");
+    pushcfunction(L, lua::wrap<l_meta_newindex>);
+    setfield(L, "__newindex");
+    return 1;
+}