1 files changed, 101 insertions, 13 deletions

diff --git a/src/common.hpp b/src/common.hpp
index aaf1cad..2dd7c45 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -2,16 +2,37 @@
 #include <cstdint>
 #include <cmath>
 #include <map>
+#include <unordered_set>
 #include <SFML/Graphics.hpp>
 
-namespace game {
-	class entity_t {
-		virtual void render(sf::RenderWindow *window) = 0;
+namespace procgen {
+	class prng_t {
+		uint32_t state = 0;
+
+	public:
+		void seed(uint32_t seed);
+		uint32_t next(void);
+		float next_float(void);
+		void unit_vec(float out[2]);
+
+	};
+
+	class perlin_noise_t {
+		size_t size;
+		float (*table)[2] = nullptr;
+
+		float table_dot(size_t nx, size_t ny, float dx, float dy);
+
+	public:
+		~perlin_noise_t();
+
+		void generate(prng_t *prng, size_t size);
+		float get(float x, float y, float scale);
 	};
 }
 
 namespace world {
-	#define SECTOR_SIZE 16
+	#define SECTOR_SIZE 8
 
 	class tile_t {
 	public:
@@ -27,30 +48,59 @@ namespace world {
 		bool operator<(sector_index_t B) const;
 	};
 
+	class entity_t;
+
 	class sector_t {
-		std::vector<game::entity_t*> entities;
 	public:
+		sf::FloatRect bounds;
+		std::unordered_set<entity_t*> ents;
+
 		bool empty = true;
 		tile_t tiles[SECTOR_SIZE * SECTOR_SIZE];
-
-		void generate(sector_index_t index);
 	};
 
 	class world_t {
+		procgen::prng_t prng;
+		procgen::perlin_noise_t perlin;
 		std::map<sector_index_t, sector_t> sectors;
 
+		void generate(sector_t *sector, sector_index_t index);
+
 	public:
+		world_t(void);
 		sector_t *get_sector(sector_index_t index);
 		tile_t *get_tile(ssize_t x, ssize_t y);
 
-		void link(game::entity_t *entity);
-		void unlink(game::entity_t *entity);
 		void render(sf::RenderWindow *window);
 	};
+
+	class entity_t {
+		world_t *parent_world;
+		std::vector<sector_t*> parents;
+
+	public:
+		sf::Vector2f origin, size;
+
+		void link(world_t *world);
+		void unlink();
+	};
+}
+
+namespace game {
+	class state_t {
+		world::world_t world;
+
+	public:
+		void tick(void);
+		void render(sf::RenderWindow *window_);
+	};
 }
 
 namespace interface {
 	class state_t {
+		sf::RenderWindow *window;
+		game::state_t *game;
+
 		struct {
 			sf::Vector2f center;
 			int target_zoom = 3;
@@ -60,11 +110,49 @@ namespace interface {
 		} camera;
 
 	public:
-		sf::RenderWindow *window;
-		world::world_t *world;
-
-		state_t(sf::RenderWindow *window_, world::world_t *world_);
+		state_t(sf::RenderWindow *window_, game::state_t *game);
 		void tick(void);
 		void render(void);
 	};
 }
+
+// Divide and round to minus infinity.
+template <typename T>
+T divide_rmi(T x, T y, T *rem)
+{
+	T rv;
+
+	if (x >= 0) {
+		*rem = x % y;
+		return x / y;
+	}
+
+	rv = (x + 1) / y - 1;
+	*rem = x - rv * y;
+	return rv;
+}
+
+// Modulo operation. y is expected to be positive.
+template <typename T>
+T mod(T x, T y)
+{
+	return (x % y) + (x < 0 ? y : 0);
+}
+
+// Linear interpolation.
+template <typename T>
+T lerp(T a, T b, T x)
+{
+	return a * (1 - x) + b * x;
+}
+
+// Bilinear interpolation.
+template <typename T>
+T bilerp(T a, T b, T c, T d, T x, T y)
+{
+	T ab, cd;
+
+	ab = lerp(a, b, x);
+	cd = lerp(c, d, x);
+	return lerp(ab, cd, y);
+}