examples/app/game_of_life/src/main.cpp

Note

This Source File belongs to Game of Life Example. Please follow the link for example explanation.

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#include <range/v3/all.hpp>
 
#include <AUI/Platform/AWindow.h>
#include <AUI/Platform/Entry.h>
#include <AUI/Util/UIBuildingHelpers.h>
#include <AUI/View/AButton.h>
#include <AUI/View/AScrollArea.h>
#include <AUI/View/ATextArea.h>
 
using namespace declarative;
using namespace ass;
using namespace std::chrono_literals;
 
enum class CellState : std::uint8_t {
   DEAD,
   ALIVE,
};
 
constexpr CellState operator!(CellState s) {
   return s == CellState::ALIVE ? CellState::DEAD : CellState::ALIVE;
}
 
using CellsImage = AFormattedImage<APixelFormat::RGBA_BYTE>;
 
class Cells : public AObject {
public:
   Cells(glm::ivec2 size) {
       mSize = size;
       for (auto s : { &mStorage, &mNextPopulation }) {
           s->resize(size.x * size.y);
       }
 
       connect(mTimer->fired, me::frame);
       connect(isRunning.changed, slot(mTimer)::setRunning);
   }
 
   void frame() {
       mFrame = AThreadPool::global() * [&] {
           for (int y = 0; y < mSize.y; ++y) {
               for (int x = 0; x < mSize.x; ++x) {
                   glm::ivec2 i { x, y };
                   get(mNextPopulation, i) = [&] {
                       auto around = cellsAround(i);
                       switch (around) {
                           default:
                               return CellState::DEAD;
                           case 2:
                               return get(mStorage, i);
                           case 3:
                               return CellState::ALIVE;
                       }
                   }();
               }
           }
           std::swap(mStorage, mNextPopulation);
 
           emit frameComplete;
       };
   }
 
   [[nodiscard]] glm::ivec2 size() const noexcept { return mSize; }
 
   [[nodiscard]] const AVector<CellState>& storage() const noexcept { return mStorage; }
 
   [[nodiscard]] CellState& operator[](glm::ivec2 position) { return get(mStorage, position); }
 
   void randomize() {
       ranges::generate(mStorage, [&] {
           static std::default_random_engine re;
           static std::uniform_int_distribution d(0, 10);
           return d(re) > 7 ? CellState::ALIVE : CellState::DEAD;
       });
       emit frameComplete;
   }
 
   AProperty<bool> isRunning = false;
   emits<> frameComplete;
 
private:
   _<ATimer> mTimer = _new<ATimer>(100ms);
   AFuture<> mFrame;
   glm::ivec2 mSize {};
   AVector<CellState> mStorage;
   AVector<CellState> mNextPopulation;
 
   CellState& get(AVector<CellState>& storage, glm::ivec2 position) {
       position %= mSize;
       if (position.x < 0) {
           position.x = mSize.x + position.x;
       }
       if (position.y < 0) {
           position.y = mSize.y + position.y;
       }
       return storage[position.y * mSize.x + position.x];
   }
 
   unsigned cellsAround(glm::ivec2 position) {
       unsigned accumulator = 0;
       for (int y = -1; y <= 1; ++y) {
           for (int x = -1; x <= 1; ++x) {
               if (x == 0 && y == 0) {
                   continue;
               }
               accumulator += get(mStorage, position + glm::ivec2 { x, y }) == CellState::ALIVE ? 1 : 0;
           }
       }
       return accumulator;
   }
}; 
 
class CellsView : public AView {
public:
   static constexpr auto SCALE = 8_dp;
 
   CellsView(_<Cells> cells) : mCells(std::move(cells)) { connect(mCells->frameComplete, me::updateTexture); }
 
   void render(ARenderContext ctx) override {
       AView::render(ctx);
       if (mTexture) {
           ctx.render.rectangle(ATexturedBrush { mTexture }, { 0, 0 }, float(SCALE) * glm::vec2(mCells->size()));
       }
       auto drawGrid = [&] {
           ASmallVector<std::pair<glm::vec2, glm::vec2>, 128 * 2> points;
           for (int i = 1; i < mCells->size().x; ++i) {
               points << std::make_pair(glm::vec2(i * SCALE, 0.f), glm::vec2(i * SCALE, getSize().y));
           }
           for (int i = 1; i < mCells->size().y; ++i) {
               points << std::make_pair(glm::vec2(0.f, i * SCALE), glm::vec2(getSize().x, i * SCALE));
           }
           ctx.render.lines(ASolidBrush { AColor::GRAY }, points);
       };
       drawGrid();
   }
 
   void onPointerPressed(const APointerPressedEvent& event) override {
       AView::onPointerPressed(event);
       glm::ivec2 position = glm::ivec2(event.position / float(SCALE));
       (*mCells)[position] = !(*mCells)[position];
       updateTexture();
   }
 
   int getContentMinimumWidth() override { return mCells->size().x * SCALE; }
 
   int getContentMinimumHeight() override { return mCells->size().y * SCALE; }
 
private:
   _<Cells> mCells;
   _<ITexture> mTexture;
 
   void updateTexture() {
       if (!mTexture) {
           mTexture = AWindow::current()->getRenderingContext()->renderer().getNewTexture();
       }
 
       CellsImage image(mCells->size());
       for (unsigned y = 0; y < image.height(); ++y) {
           for (unsigned x = 0; x < image.width(); ++x) {
               image.set(
                   { x, y },
                   AFormattedColorConverter(
                       (*mCells)[glm::ivec2(x, y)] == CellState::ALIVE
                           ? AColor::WHITE
                           : AColor::TRANSPARENT_BLACK));
           }
       }
       mTexture->setImage(image);
       redraw();
   }
}; 
 
class GameOfLifeWindow : public AWindow {
public:
   GameOfLifeWindow() : AWindow("Game of Life") {
       setContents(Vertical {
         Centered {
           Horizontal {
             _new<AButton>("Randomize") let {
                     connect(it->clicked, slot(mCells)::randomize);
                 },
             _new<AButton>() let {
                     it & mCells.isRunning > [](AButton& b, bool isRunning) {
                         b.setText(isRunning ? "Pause" : "Run");
                     };
                     connect(it->clicked, [&] { mCells.isRunning = !mCells.isRunning; });
                 },
           },
         },
         Centered {
           _new<CellsView>(aui::ptr::fake(&mCells)) with_style {
                 Expanding(),
                 BackgroundSolid(AColor::BLACK),
               },
         },
       });
   }
 
private:
   Cells mCells { { 64, 64 } };
}; 
 
AUI_ENTRY {
   auto w = _new<GameOfLifeWindow>();
   w->pack();
   w->show();
   return 0;
}

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