commit eaf27df1a08016b020b791b00583d443ff6c3447
Author: lisyarus <lisyarus@gmail.com>
Date:   Sat Aug 17 18:18:11 2024 +0300

    Initial commit: basic mechanics

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..57846f9
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "psemek"]
+	path = psemek
+	url = git@bitbucket.org:lisyarus/psemek.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..11e195f
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.16)
+project(gmtk-2024)
+
+set(CMAKE_CXX_STANDARD 20)
+set(PSEMEK_EXAMPLES OFF)
+
+set(PSEMEK_PACKAGE_OUTPUT_PATH package)
+set(PSEMEK_GRAPHICS_API OPENGL)
+
+add_subdirectory(psemek)
+
+file(GLOB_RECURSE GMTK_SOURCES LIST_DIRECTORIES FALSE "${CMAKE_CURRENT_SOURCE_DIR}/source/*")
+file(GLOB_RECURSE GMTK_HEADERS LIST_DIRECTORIES FALSE "${CMAKE_CURRENT_SOURCE_DIR}/include/*")
+
+psemek_add_application(gmtk-2024 ${GMTK_SOURCES} ${GMTK_HEADERS})
diff --git a/psemek b/psemek
new file mode 160000
index 0000000..6368ca5
--- /dev/null
+++ b/psemek
@@ -0,0 +1 @@
+Subproject commit 6368ca5e680bbcae3d13df4e87ed25ef80728cd3
diff --git a/source/application.cpp b/source/application.cpp
new file mode 100644
index 0000000..67d8dca
--- /dev/null
+++ b/source/application.cpp
@@ -0,0 +1,627 @@
+#include <psemek/app/default_application_factory.hpp>
+#include <psemek/gfx/gl.hpp>
+#include <psemek/gfx/painter.hpp>
+#include <psemek/util/array.hpp>
+#include <psemek/random/generator.hpp>
+#include <psemek/random/device.hpp>
+#include <psemek/random/uniform.hpp>
+#include <psemek/util/hash_table.hpp>
+#include <psemek/util/enum.hpp>
+#include <psemek/util/clock.hpp>
+#include <psemek/geom/box.hpp>
+#include <psemek/geom/camera.hpp>
+
+#include <psemek/log/log.hpp>
+
+#include <variant>
+#include <deque>
+#include <format>
+
+namespace gmtk
+{
+
+	using namespace psemek;
+
+	psemek_declare_enum(color, std::uint32_t,
+		(red)
+		(green)
+		(blue)
+	)
+
+	gfx::color_rgba to_color(color c)
+	{
+		switch (c)
+		{
+		case color::red: return {255, 127, 127, 255};
+		case color::green: return {127, 255, 127, 255};
+		case color::blue: return {127, 127, 255, 255};
+		}
+		throw util::unknown_enum_value_exception{c};
+	}
+
+	struct tile;
+
+	struct grid
+	{
+		util::array<tile, 2> tiles;
+		util::array<bool, 2> item_target;
+
+		util::array<util::hash_set<geom::point<int, 2>>, 2> belts;
+
+		static grid create();
+
+		static geom::point<int, 2> const indices[9];
+
+		static geom::vector<int, 2> const neighbours[4];
+	};
+
+	geom::point<int, 2> const grid::indices[9] =
+	{
+		{0, 0},
+		{1, 0},
+		{2, 0},
+		{0, 1},
+		{1, 1},
+		{2, 1},
+		{0, 2},
+		{1, 2},
+		{2, 2},
+	};
+
+	geom::vector<int, 2> const grid::neighbours[4] =
+	{
+		{1, 0},
+		{0, 1},
+		{-1, 0},
+		{0, -1},
+	};
+
+	struct empty{};
+
+	struct source
+	{
+		color type;
+	};
+
+	struct factory
+	{
+		color input;
+		color output;
+	};
+
+	struct zoomer
+	{
+		struct grid grid;
+	};
+
+	using tile_variant = std::variant<empty, source, factory, zoomer>;
+
+	struct tile
+		: tile_variant
+	{
+		using tile_variant::variant;
+	};
+
+	grid grid::create()
+	{
+		grid result;
+
+		result.tiles.resize({3, 3});
+		result.belts.resize({3, 3});
+		result.item_target.resize({9, 9}, false);
+
+		return result;
+	}
+
+	struct item
+	{
+		color type;
+		geom::point<int, 2> start;
+		geom::point<int, 2> target;
+		float pos;
+	};
+
+	geom::point<int, 2> item_to_cell(geom::point<int, 2> const & p)
+	{
+		return {geom::idiv(p[0], 3), geom::idiv(p[1], 3)};
+	}
+
+	geom::point<int, 2> cell_center_to_item(geom::point<int, 2> const & p)
+	{
+		return {p[0] * 3 + 1, p[1] * 3 + 1};
+	}
+
+	geom::point<int, 2> task_sink_to_item(geom::point<int, 2> p)
+	{
+		p[0] *= 3;
+		p[1] *= 3;
+
+		if (p[0] == -3)
+			p += geom::vector{2, 1};
+		else if (p[1] == -3)
+			p += geom::vector{1, 2};
+		else if (p[0] == 9)
+			p += geom::vector{0, 1};
+		else if (p[1] == 9)
+			p += geom::vector{1, 0};
+
+		return p;
+	}
+
+	bool within_grid(geom::point<int, 2> const & p)
+	{
+		return p[0] >= 0 && p[0] < 3 && p[1] >= 0 && p[1] < 3;
+	}
+
+	bool item_within_grid(geom::point<int, 2> const & p)
+	{
+		return p[0] >= 0 && p[0] < 9 && p[1] >= 0 && p[1] < 9;
+	}
+
+	struct timestamp
+	{
+		int trunc = 0;
+		float frac = 0.f;
+
+		timestamp & operator += (float dt)
+		{
+			frac += dt;
+			int t = std::floor(frac);
+			trunc += t;
+			frac -= t;
+			return *this;
+		}
+
+		friend auto operator <=> (timestamp const & x, timestamp const & y) = default;
+	};
+
+	struct task
+	{
+		color type;
+
+		// In last 15 seconds
+		std::deque<timestamp> received = {};
+
+		static constexpr int freq = 3;
+	};
+
+	struct map
+	{
+		struct grid grid;
+
+		util::hash_map<geom::point<int, 2>, task> tasks;
+
+		std::vector<item> items;
+
+		timestamp time = {};
+
+		float spawn_timer = 0.f;
+	};
+
+	void generate_next_task(random::generator & rng, map & map)
+	{
+		color type;
+
+		while (true)
+		{
+			type = random::uniform_from(rng, color_values());
+			if (map.tasks.size() >= 3)
+				break;
+
+			bool good = true;
+			for (auto const & t : map.tasks)
+				if (t.second.type == type)
+					good = false;
+
+			if (good)
+				break;
+		}
+
+		while (true)
+		{
+			int x = random::uniform(rng, 0, 2);
+			int y = random::uniform<bool>(rng) ? -1 : 3;
+			if (random::uniform<bool>(rng))
+				std::swap(x, y);
+			if (map.tasks.contains({x, y}))
+				continue;
+
+			map.tasks[{x, y}] = {type};
+			break;
+		}
+	}
+
+	map starting_map(random::generator & rng)
+	{
+		map result;
+
+		result.grid = grid::create();
+
+		generate_next_task(rng, result);
+
+		return result;
+	}
+
+	void draw(map const & map, gfx::painter & painter)
+	{
+		float const grid_width = 0.1f;
+		geom::box<float, 2> source_box{{{0.2f, 0.8f}, {0.2f, 0.8f}}};
+
+		for (int x = 0; x <= 3; ++x)
+		{
+			painter.line({x, 0.f}, {x, 3.f}, grid_width, gfx::black, true);
+			painter.line({0.f, x}, {3.f, x}, grid_width, gfx::black, true);
+		}
+
+		auto & grid = map.grid;
+
+		for (auto p : grid::indices)
+			for (auto q : grid.belts(p))
+				painter.line(geom::cast<float>(p) + geom::vector{0.5f, 0.5f}, geom::cast<float>(q) + geom::vector{0.5f, 0.5f}, 0.3f, {191, 191, 191, 255}, true);
+
+		for (auto p : grid::indices)
+		{
+			for (auto q : grid.belts(p))
+			{
+				for (int i = 0; i < 3; ++i)
+				{
+					geom::vector d = geom::cast<float>(q - p);
+
+					auto c = geom::cast<float>(p) + geom::vector{0.5f, 0.5f} + d * (i / 3.f);
+
+					auto n = geom::ort(d);
+
+					c += d / 6.f;
+
+					float s = 1.f / 24.f;
+
+					d *= s;
+					n *= s;
+
+					painter.triangle(c - d + n, c - d - n, c + d, {255, 127, 0, 255});
+				}
+			}
+		}
+
+		for (auto p : grid::indices)
+		{
+			auto const & cell = grid.tiles(p);
+
+			if (auto source = std::get_if<struct source>(&cell))
+			{
+				painter.rect(source_box + geom::vector{p[0] * 1.f, p[1] * 1.f}, to_color(source->type));
+				painter.text({p[0] + 0.5f, p[1] + 0.5f}, "180/m", {.scale = {0.01f, -0.01f}, .c = {0, 0, 0, 255}});
+			}
+			else if (auto factory = std::get_if<struct factory>(&cell))
+			{
+				auto box = source_box + geom::vector{p[0] * 1.f, p[1] * 1.f};
+				painter.triangle(box.corner(0, 0), box.corner(1, 1), box.corner(0, 1), to_color(factory->input));
+				painter.triangle(box.corner(0, 0), box.corner(1, 0), box.corner(1, 1), to_color(factory->output));
+			}
+		}
+
+		for (auto const & task : map.tasks)
+		{
+			painter.rect(source_box + geom::vector{task.first[0] * 1.f, task.first[1] * 1.f}, to_color(task.second.type));
+			painter.text(geom::point{task.first[0] + 0.5f, task.first[1] + 0.5f}, std::format("{}/m", task.second.received.size() * task::freq), {.scale = {0.01f, -0.01f}, .c = {0, 0, 0, 255}});
+		}
+
+		for (auto const & item : map.items)
+		{
+			auto pos = geom::lerp(geom::cast<float>(item.start), geom::cast<float>(item.target), item.pos) + geom::vector{0.5f, 0.5f};
+			pos[0] /= 3.f;
+			pos[1] /= 3.f;
+			painter.circle(pos, 0.075f, {0, 0, 0, 255});
+			painter.circle(pos, 0.05f, to_color(item.type));
+		}
+	}
+
+	void draw_selection(geom::point<int, 2> const & p, gfx::painter & painter)
+	{
+		painter.line({p[0], p[1]}, {p[0] + 1.f, p[1]}, 0.1f, {255, 0, 255, 255}, true);
+		painter.line({p[0] + 1.f, p[1]}, {p[0] + 1.f, p[1] + 1.f}, 0.1f, {255, 0, 255, 255}, true);
+		painter.line({p[0] + 1.f, p[1] + 1.f}, {p[0], p[1] + 1.f}, 0.1f, {255, 0, 255, 255}, true);
+		painter.line({p[0], p[1] + 1.f}, {p[0], p[1]}, 0.1f, {255, 0, 255, 255}, true);
+	}
+
+	struct application
+		: app::application
+	{
+		application(options const &, context const &)
+			: rng_{random::device{}}
+			, map_(starting_map(rng_))
+		{}
+
+		void on_event(app::resize_event const & event) override
+		{
+			screen_size_ = event.size;
+		}
+
+		void on_event(app::mouse_move_event const & event) override
+		{
+			mouse_ = event.position;
+		}
+
+		void on_event(app::key_event const & event) override
+		{
+			if (event.down && event.key == app::keycode::S)
+			{
+				if (selected_ && std::holds_alternative<empty>(map_.grid.tiles(*selected_)))
+				{
+					util::hash_set<color> types;
+					if (map_.tasks.size() == 1)
+						types.insert(map_.tasks.begin()->second.type);
+					else
+						for (auto t : color_values())
+							types.insert(t);
+					map_.grid.tiles(*selected_) = source{random::uniform_from(rng_, types)};
+				}
+			}
+
+			if (event.down && event.key == app::keycode::B)
+			{
+				if (selected_)
+				{
+					if (belt_start_)
+					{
+						auto d = *selected_ - *belt_start_;
+						if (std::abs(d[0]) + std::abs(d[1]) == 1)
+						{
+							if (within_grid(*selected_))
+								map_.grid.belts(*selected_).erase(*belt_start_);
+
+							if (map_.grid.belts(*belt_start_).contains(*selected_))
+								map_.grid.belts(*belt_start_).erase(*selected_);
+							else
+								map_.grid.belts(*belt_start_).insert(*selected_);
+						}
+						belt_start_ = std::nullopt;
+					}
+					else if (within_grid(*selected_))
+						belt_start_ = *selected_;
+				}
+			}
+
+			if (event.down && event.key == app::keycode::F)
+			{
+				if (selected_ && std::holds_alternative<empty>(map_.grid.tiles(*selected_)))
+				{
+					util::hash_set<color> types;
+					for (auto const & task : map_.tasks)
+						types.insert(task.second.type);
+
+					if (types.size() == 1)
+					{
+						for (auto c : color_values())
+							types.insert(c);
+					}
+
+					color input = random::uniform_from(rng_, types);
+					types.erase(input);
+					color output = random::uniform_from(rng_, types);
+
+					map_.grid.tiles(*selected_) = gmtk::factory{input, output};
+				}
+			}
+
+			if (event.down && event.key == app::keycode::X)
+			{
+				if (selected_)
+				{
+					map_.grid.tiles(*selected_) = empty{};
+				}
+			}
+
+			if (event.down && event.key == app::keycode::SPACE)
+			{
+				generate_next_task(rng_, map_);
+			}
+		}
+
+		bool running() const override
+		{
+			return running_;
+		}
+
+		void stop() override
+		{
+			running_ = false;
+		}
+
+		void update() override
+		{
+			float const dt = clock_.restart().count();
+
+			map_.time += dt;
+
+			map_.spawn_timer += 3.f * dt;
+			if (map_.spawn_timer >= 1.f)
+			{
+				map_.spawn_timer -= 1.f;
+
+				for (auto p : grid::indices)
+				{
+					if (auto source = std::get_if<struct source>(&map_.grid.tiles(p)))
+					{
+						auto pos = cell_center_to_item(p);
+
+						if (!map_.grid.item_target(pos))
+						{
+							auto & item = map_.items.emplace_back();
+							item.type = source->type;
+							item.start = pos;
+							item.target = pos;
+							map_.grid.item_target(pos) = true;
+						}
+					}
+				}
+			}
+
+			for (auto & task : map_.tasks)
+			{
+				auto & received = task.second.received;
+				auto threshold = map_.time;
+				threshold.trunc -= 60 / task::freq;
+				while (!received.empty() && received.front() < threshold)
+					received.pop_front();
+			}
+
+			std::vector<item> alive_items;
+			for (auto item : map_.items)
+			{
+				if (item.start != item.target)
+				{
+					item.pos += 3.f * dt;
+
+					if (item.pos < 1.f)
+					{
+						alive_items.push_back(item);
+						continue;
+					}
+
+					item.pos -= 1.f;
+				}
+
+				if (item_within_grid(item.target))
+					map_.grid.item_target(item.target) = false;
+
+				auto cell = item_to_cell(item.target);
+
+				if (map_.tasks.contains(cell))
+				{
+					if (map_.tasks.at(cell).type == item.type)
+						map_.tasks.at(cell).received.push_back(map_.time);
+					continue;
+				}
+
+				if (item_within_grid(item.target) && item.target == cell_center_to_item(cell))
+				{
+					if (auto factory = std::get_if<gmtk::factory>(&map_.grid.tiles(cell)))
+					{
+						if (factory->input == item.type)
+							item.type = factory->output;
+					}
+				}
+
+				std::vector<geom::point<int, 2>> targets;
+
+				if (geom::imod(item.target[0], 3) == 1 && geom::imod(item.target[1], 3) == 1)
+				{
+					for (auto q : map_.grid.belts(cell))
+					{
+						auto t = item.target + (q - cell);
+						if (!item_within_grid(t) || !map_.grid.item_target(t))
+							targets.push_back(t);
+					}
+				}
+				else
+				{
+					auto s = item.target;
+					if (geom::imod(s[0], 3) == 0)
+						s[0] -= 1;
+					else if (geom::imod(s[0], 3) == 2)
+						s[0] += 1;
+					else if (geom::imod(s[1], 3) == 0)
+						s[1] -= 1;
+					else if (geom::imod(s[1], 3) == 2)
+						s[1] += 1;
+
+					if (!item_within_grid(s) || !map_.grid.item_target(s))
+						if (within_grid(item_to_cell(item.target)) && map_.grid.belts(item_to_cell(item.target)).contains(item_to_cell(s)))
+							targets.push_back(s);
+
+					auto t = item.target - (s - item.target);
+
+					if (!item_within_grid(t) || !map_.grid.item_target(t))
+						if (within_grid(item_to_cell(s)) && map_.grid.belts(item_to_cell(s)).contains(item_to_cell(item.target)))
+							targets.push_back(t);
+				}
+
+				item.start = item.target;
+
+				if (!targets.empty())
+					item.target = random::uniform_from(rng_, targets);
+
+				if (item_within_grid(item.target))
+					map_.grid.item_target(item.target) = true;
+				alive_items.push_back(item);
+			}
+			map_.items = std::move(alive_items);
+
+			float aspect_ratio = (screen_size_[0] * 1.f) / screen_size_[1];
+
+			view_box_[1] = {-1.f, 4.f};
+			view_box_[0] = view_box_[1];
+			view_box_[0] = geom::expand(view_box_[0], (view_box_[1].length() * aspect_ratio - view_box_[0].length()) / 2.f);
+
+			selected_ = std::nullopt;
+
+			{
+				auto m = screen_to_grid(geom::cast<float>(mouse_));
+
+				int x = std::floor(m[0]);
+				int y = std::floor(m[1]);
+
+				if (x >= 0 && x < 3 && y >= 0 && y < 3)
+					selected_ = geom::point{x, y};
+				else if (map_.tasks.contains({x, y}))
+					selected_ = geom::point{x, y};
+			}
+		}
+
+		void present() override
+		{
+			gl::ClearColor(1.f, 1.f, 1.f, 1.f);
+			gl::Clear(gl::COLOR_BUFFER_BIT);
+
+			draw(map_, painter_);
+
+			if (selected_)
+				draw_selection(*selected_, painter_);
+
+			painter_.render(geom::orthographic_camera{view_box_}.transform());
+		}
+
+	private:
+		bool running_ = true;
+
+		random::generator rng_;
+		map map_;
+
+		util::clock<> clock_;
+
+		geom::vector<int, 2> screen_size_{1, 1};
+		geom::point<int, 2> mouse_{0, 0};
+
+		gfx::painter painter_;
+
+		geom::box<float, 2> view_box_;
+
+		std::optional<geom::point<int, 2>> selected_;
+		std::optional<geom::point<int, 2>> belt_start_;
+
+		geom::point<float, 2> screen_to_grid(geom::point<float, 2> const & p)
+		{
+			return view_box_.corner(
+				p[0] / screen_size_[0],
+				1.f - p[1] / screen_size_[1]
+			);
+		}
+	};
+
+}
+
+namespace psemek::app
+{
+
+	std::unique_ptr<application::factory> make_application_factory()
+	{
+		application::options options
+		{
+			.name = "GMTK 2024",
+		};
+
+		return default_application_factory<gmtk::application>(options);
+	}
+
+}