tiny_link/src/components/collider.h

#pragma once
#include <blah.h>
#include <memory>
#include "../world.h"

using namespace Blah;

namespace TL
{
	class Collider : public Component
	{
	public:
		enum class Shape
		{
			None,
			Rect,
			Grid
		};

		uint32_t mask;

		Collider();

		static Collider make_rect(const RectI& rect);
		static Collider make_grid(int tile_size, int columns, int rows);

		Shape shape() const;
		RectI get_rect() const;
		void set_rect(const RectI& value);
		bool get_cell(int x, int y) const;
		void set_cell(int x, int y, bool value);

		bool check(uint32_t mask, Point offset = Point::zero) const;
		bool overlaps(const Collider* other, Point offset = Point::zero) const;

		void render(Batch& batch) override;

	private:
		struct Grid
		{
			int columns;
			int rows;
			int tile_size;
			std::shared_ptr<bool[]> cells;
		};

		Shape m_shape = Shape::None;
		RectI m_rect;
		Grid m_grid;

		static bool rect_to_rect(const Collider* a, const Collider* b, Point offset);
		static bool rect_to_grid(const Collider* a, const Collider* b, Point offset);
	};
}