From e5d45a8c67439b8a0b2c1c909c7fb1875780b1fd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dominik=20Madar=C3=A1sz?= <zaklaus@outlook.com>
Date: Tue, 4 May 2021 19:41:30 +0200
Subject: [PATCH] the rest

---
 code/apps/playground/header/mock.h |   9 --
 code/common/packets/packet_list.h  |   6 -
 code/common/world/blocks.c         |  49 ++++++++
 code/common/world/blocks.h         |  19 ++++
 code/common/world/blocks_info.h    |  20 ++++
 code/common/world/blocks_list.c    |  10 ++
 code/common/world/perlin.c         |  70 ++++++++++++
 code/common/world/perlin.h         |   6 +
 code/common/world/world.c          | 175 +++++++++++++++++++++++++++++
 code/common/world/world.h          |  32 ++++++
 code/common/world/world_gen.c      | 133 ++++++++++++++++++++++
 code/modules/CMakeLists.txt        |   3 +
 code/modules/modules/controllers.h |  28 +++++
 code/modules/modules/general.h     |  30 +++++
 code/modules/modules/net.h         |  18 +++
 code/modules/modules/physics.h     |  23 ++++
 code/modules/source/controllers.c  |  30 +++++
 code/modules/source/general.c      |  19 ++++
 code/modules/source/net.c          |  16 +++
 code/modules/source/physics.c      |  31 +++++
 20 files changed, 712 insertions(+), 15 deletions(-)
 delete mode 100644 code/apps/playground/header/mock.h
 delete mode 100644 code/common/packets/packet_list.h
 create mode 100644 code/common/world/blocks.c
 create mode 100644 code/common/world/blocks.h
 create mode 100644 code/common/world/blocks_info.h
 create mode 100644 code/common/world/blocks_list.c
 create mode 100644 code/common/world/perlin.c
 create mode 100644 code/common/world/perlin.h
 create mode 100644 code/common/world/world.c
 create mode 100644 code/common/world/world.h
 create mode 100644 code/common/world/world_gen.c
 create mode 100644 code/modules/CMakeLists.txt
 create mode 100644 code/modules/modules/controllers.h
 create mode 100644 code/modules/modules/general.h
 create mode 100644 code/modules/modules/net.h
 create mode 100644 code/modules/modules/physics.h
 create mode 100644 code/modules/source/controllers.c
 create mode 100644 code/modules/source/general.c
 create mode 100644 code/modules/source/net.c
 create mode 100644 code/modules/source/physics.c

diff --git a/code/apps/playground/header/mock.h b/code/apps/playground/header/mock.h
deleted file mode 100644
index 0b4701c..0000000
--- a/code/apps/playground/header/mock.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#pragma once
-
-uint64_t world_chunk_size(void) {
-    return 4;
-}
-
-uint64_t world_chunk_amount(void) {
-    return 8;
-}
diff --git a/code/common/packets/packet_list.h b/code/common/packets/packet_list.h
deleted file mode 100644
index 53344bd..0000000
--- a/code/common/packets/packet_list.h
+++ /dev/null
@@ -1,6 +0,0 @@
-#pragma once
-#include "packet_utils.h"
-#include "packet.h"
-
-// NOTE(zaklaus): pkt data
-
diff --git a/code/common/world/blocks.c b/code/common/world/blocks.c
new file mode 100644
index 0000000..f8d6a96
--- /dev/null
+++ b/code/common/world/blocks.c
@@ -0,0 +1,49 @@
+#include "zpl.h"
+#include "world/blocks.h"
+
+// todo: csv parsing + utils
+
+#define BLOCKS_COUNT (sizeof(blocks)/sizeof(block))
+
+typedef struct {
+    uint8_t tex_id;
+    char *name;
+    uint32_t flags;
+    uint32_t kind;
+    uint32_t biome;
+    char symbol;
+} block;
+
+#include "blocks_list.c"
+
+uint8_t blocks_find(uint32_t biome, uint32_t kind) {
+    for (int i=0; i<BLOCKS_COUNT; i++) {
+        if (blocks[i].biome == biome && blocks[i].kind == kind)
+            return i;
+    }
+    return BLOCK_INVALID;
+}
+
+char *blocks_get_name(uint8_t id) {
+    return blocks[id].name;
+}
+
+uint8_t blocks_get_tex_id(uint8_t id) {
+    return blocks[id].tex_id;
+}
+
+char blocks_get_symbol(uint8_t id) {
+    return blocks[id].symbol;
+}
+
+uint32_t blocks_get_flags(uint8_t id) {
+    return blocks[id].flags;
+}
+
+uint32_t blocks_get_biome(uint8_t id) {
+    return blocks[id].biome;
+}
+
+uint32_t blocks_get_kind(uint8_t id) {
+    return blocks[id].kind;
+}
diff --git a/code/common/world/blocks.h b/code/common/world/blocks.h
new file mode 100644
index 0000000..4f6ec36
--- /dev/null
+++ b/code/common/world/blocks.h
@@ -0,0 +1,19 @@
+#pragma once
+#include "system.h"
+
+#define BLOCK_INVALID 0xF
+
+typedef enum {
+    BLOCK_FLAG_COLLISION = (1 << 0)
+} block_flags;
+
+#include "blocks_info.h"
+
+uint8_t blocks_find(uint32_t biome, uint32_t kind);
+
+char *blocks_get_name(uint8_t id);
+uint8_t blocks_get_tex_id(uint8_t id);
+char blocks_get_symbol(uint8_t id);
+uint32_t blocks_get_flags(uint8_t id);
+uint32_t blocks_get_biome(uint8_t id);
+uint32_t blocks_get_kind(uint8_t id);
diff --git a/code/common/world/blocks_info.h b/code/common/world/blocks_info.h
new file mode 100644
index 0000000..34a9aae
--- /dev/null
+++ b/code/common/world/blocks_info.h
@@ -0,0 +1,20 @@
+#pragma once
+
+typedef enum {
+    BLOCK_KIND_DEV,
+    BLOCK_KIND_GROUND,
+    BLOCK_KIND_WATER,
+    BLOCK_KIND_WALL,
+    BLOCK_KIND_HILL,
+    BLOCK_KIND_HILL_SNOW,
+    BLOCK_KIND_HOLE,
+} block_kind;
+
+typedef enum {
+    BLOCK_BIOME_DEV,
+    BLOCK_BIOME_PLAIN,
+    BLOCK_BIOME_FOREST,
+    BLOCK_BIOME_DESERT,
+    BLOCK_BIOME_ICE,
+    BLOCK_BIOME_OCEAN,
+} block_biome;
diff --git a/code/common/world/blocks_list.c b/code/common/world/blocks_list.c
new file mode 100644
index 0000000..1871d80
--- /dev/null
+++ b/code/common/world/blocks_list.c
@@ -0,0 +1,10 @@
+#include "atlas_shared.h"
+#include "world/blocks.h"
+
+static block blocks[] = {
+    {.tex_id = ATLAS_XY(0, 0), .name = "base-ground", .flags = 0, .kind = BLOCK_KIND_GROUND, .biome = 0, .symbol = '.'},
+    {.tex_id = ATLAS_XY(1, 0), .name = "base-wall", .flags = BLOCK_FLAG_COLLISION, .kind = BLOCK_KIND_WALL, .biome = 0, .symbol = '#'},
+    {.tex_id = ATLAS_XY(2, 0), .name = "base-hill", .flags = BLOCK_FLAG_COLLISION, .kind = BLOCK_KIND_HILL, .biome = 0, .symbol = '^'},
+    {.tex_id = ATLAS_XY(3, 0), .name = "base-hill-snow", .flags = BLOCK_FLAG_COLLISION, .kind = BLOCK_KIND_HILL_SNOW, .biome = 0, .symbol = '*'},
+    {.tex_id = ATLAS_XY(0, 1), .name = "base-water", .flags = BLOCK_FLAG_COLLISION, .kind = BLOCK_KIND_WATER, .biome = 0, .symbol = '~'},
+};
diff --git a/code/common/world/perlin.c b/code/common/world/perlin.c
new file mode 100644
index 0000000..a4fddc6
--- /dev/null
+++ b/code/common/world/perlin.c
@@ -0,0 +1,70 @@
+#include <math.h>
+#include "world/perlin.h"
+
+// adapted from: https://gist.github.com/nowl/828013#gistcomment-2807232
+
+static const uint8_t PERLIN_PERM_TABLE[] = {
+    208,34,231,213,32,248,233,56,161,78,24,140,71,48,140,254,245,255,247,247,40,
+    185,248,251,245,28,124,204,204,76,36,1,107,28,234,163,202,224,245,128,167,204,
+    9,92,217,54,239,174,173,102,193,189,190,121,100,108,167,44,43,77,180,204,8,81,
+    70,223,11,38,24,254,210,210,177,32,81,195,243,125,8,169,112,32,97,53,195,13,
+    203,9,47,104,125,117,114,124,165,203,181,235,193,206,70,180,174,0,167,181,41,
+    164,30,116,127,198,245,146,87,224,149,206,57,4,192,210,65,210,129,240,178,105,
+    228,108,245,148,140,40,35,195,38,58,65,207,215,253,65,85,208,76,62,3,237,55,89,
+    232,50,217,64,244,157,199,121,252,90,17,212,203,149,152,140,187,234,177,73,174,
+    193,100,192,143,97,53,145,135,19,103,13,90,135,151,199,91,239,247,33,39,145,
+    101,120,99,3,186,86,99,41,237,203,111,79,220,135,158,42,30,154,120,67,87,167,
+    135,176,183,191,253,115,184,21,233,58,129,233,142,39,128,211,118,137,139,255,
+    114,20,218,113,154,27,127,246,250,1,8,198,250,209,92,222,173,21,88,102,219
+};
+
+static int32_t perlin_noise2_sample(int32_t seed, int32_t x, int32_t y) {
+    int32_t yindex = (y + seed) % 256;
+    if (yindex < 0)
+        yindex += 256;
+    int32_t xindex = (PERLIN_PERM_TABLE[yindex] + x) % 256;
+    if (xindex < 0)
+        xindex += 256;
+    return PERLIN_PERM_TABLE[xindex];
+}
+
+static double perlin_lerp(double x, double y, double t) {
+    return x + t*(y - x);
+}
+
+static double perlin_smooth_lerp(double x, double y, double t) {
+    return perlin_lerp(x, y, t * t * (3-2*t));
+}
+
+double perlin_noise2d(int32_t seed, double x, double y) {
+    int32_t x_int = floor(x);
+    int32_t y_int = floor(y);
+    double x_frac = x - x_int;
+    double y_frac = y - y_int;
+    int32_t s = perlin_noise2_sample(seed, x_int, y_int);
+    int32_t t = perlin_noise2_sample(seed, x_int+1, y_int);
+    int32_t u = perlin_noise2_sample(seed, x_int, y_int+1);
+    int32_t v = perlin_noise2_sample(seed, x_int+1, y_int+1);
+    double low = perlin_smooth_lerp(s, t, x_frac);
+    double high = perlin_smooth_lerp(u, v, x_frac);
+    double result = perlin_smooth_lerp(low, high, y_frac);
+    return result;
+}
+
+double perlin_fbm(int32_t seed, double x, double y, double freq, uint32_t octaves) {
+    double xa = x*freq;
+    double ya = y*freq;
+    double amp = 1.0;
+    double res = 0.0;
+    double div = 0.0;
+
+    for (uint32_t i=0; i<octaves; i++) {
+        div += 256.0 * amp;
+        res += perlin_noise2d(seed, xa, ya) * amp;
+        amp *= 0.5;
+        xa *= 2.0;
+        ya *= 2.0;
+    }
+
+    return res/div;
+}
diff --git a/code/common/world/perlin.h b/code/common/world/perlin.h
new file mode 100644
index 0000000..66f184d
--- /dev/null
+++ b/code/common/world/perlin.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include "system.h"
+
+double perlin_noise2d(int32_t seed, double x, double y);
+double perlin_fbm(int32_t seed, double x, double y, double freq, uint32_t octaves);
diff --git a/code/common/world/world.c b/code/common/world/world.c
new file mode 100644
index 0000000..6b2c7ab
--- /dev/null
+++ b/code/common/world/world.c
@@ -0,0 +1,175 @@
+#include "zpl.h"
+#include "librg.h"
+#include "modules/general.h"
+#include "world/world.h"
+
+typedef struct {
+    uint8_t *data;
+    uint32_t seed;
+    uint32_t size;
+    uint32_t width;
+    uint32_t height;
+    uint16_t block_size;
+    uint16_t chunk_size;
+    uint16_t world_size;
+    ecs_world_t *ecs;
+    librg_world *tracker;
+    world_pkt_reader_proc *reader_proc;
+    world_pkt_writer_proc *writer_proc;
+} world_data;
+
+
+static world_data world = {0};
+
+int32_t world_gen();
+
+int32_t world_write_update(librg_world *w, librg_event *e) {
+    int64_t owner_id = librg_event_owner_get(w, e);
+    int64_t entity_id = librg_event_entity_get(w, e);
+
+    return 0;
+
+    // /* prevent sending updates to users who own that entity */
+    // /* since they will be responsible on telling where that entity is supposed to be */
+    // if (librg_entity_owner_get(w, entity_id) == owner_id) {
+    //     return LIBRG_WRITE_REJECT;
+    // }
+
+    // /* read our current position */
+    // ENetPeer *peer = (ENetPeer *)librg_entity_userdata_get(w, entity_id);
+
+    // char *buffer = librg_event_buffer_get(w, e);
+    // size_t max_length = librg_event_size_get(w, e);
+
+    // /* check if we have enough space to write and valid position */
+    // if (sizeof(vec3) > max_length || !peer->data) {
+    //     return LIBRG_WRITE_REJECT;
+    // }
+
+    // /* write data and return how much we've written */
+    // memcpy(buffer, peer->data, sizeof(vec3));
+    // return sizeof(vec3);
+}
+
+int32_t world_init_minimal(uint16_t block_size, uint16_t chunk_size, uint16_t world_size, world_pkt_reader_proc *reader_proc, world_pkt_writer_proc *writer_proc) {
+    world.chunk_size = chunk_size;
+    world.world_size = world_size;
+    if (reader_proc) world.reader_proc = reader_proc;
+    if (writer_proc) world.writer_proc = writer_proc;
+    
+    world.width = chunk_size * world_size;
+    world.height = chunk_size * world_size;
+    world.size = world.width * world.height;
+    world.block_size = block_size;
+       
+    if (world.tracker != NULL) {
+        librg_world_destroy(world.tracker);
+        world.tracker = NULL;
+    }
+    
+    world.tracker = librg_world_create();
+    
+    if (world.tracker == NULL) {
+        zpl_printf("[ERROR] An error occurred while trying to create a server world.\n");
+        return WORLD_ERROR_TRACKER_FAILED;
+    }
+    
+    /* config our world grid */
+    librg_config_chunksize_set(world.tracker, block_size * chunk_size, block_size * chunk_size, 1);
+    librg_config_chunkamount_set(world.tracker, world_size, world_size, 1);
+    librg_config_chunkoffset_set(world.tracker, LIBRG_OFFSET_MID, LIBRG_OFFSET_MID, LIBRG_OFFSET_MID);
+    
+    return 0;
+}
+
+int32_t world_init(int32_t seed, uint16_t block_size, uint16_t chunk_size, uint16_t world_size, world_pkt_reader_proc *reader_proc, world_pkt_writer_proc *writer_proc) {
+    if (world.data) {
+        return 0;
+    }
+    
+    world.seed = seed;
+    world_init_minimal(chunk_size, block_size, world_size, reader_proc, writer_proc);
+    world.data = zpl_malloc(sizeof(uint8_t)*world.size);
+    
+    if (!world.data) {
+        return WORLD_ERROR_OUTOFMEM;
+    }
+    
+    world.ecs = ecs_init();
+    ecs_set_entity_range(world.ecs, 0, UINT32_MAX);
+    //ecs_set_threads(world.ecs, 4);
+    
+    ECS_IMPORT(world.ecs, General);
+
+    for (int i = 0; i < chunk_size * chunk_size; ++i) {
+        ecs_entity_t e = ecs_new(world.ecs, 0);
+        ecs_set(world.ecs, e, Chunk, {
+            .x = i % chunk_size,
+            .y = i / chunk_size,
+        });
+
+        librg_entity_track(world.tracker, e);
+        librg_entity_chunk_set(world.tracker, e, i);
+    }
+
+    // librg_event_set(world.tracker, LIBRG_WRITE_UPDATE, world_write_update);
+    // librg_event_set(world.tracker, LIBRG_READ_UPDATE, server_read_update);
+    
+    zpl_printf("[INFO] Created a new server world\n");
+    
+    return world_gen();
+}
+
+int32_t world_destroy(void) {
+    librg_world_destroy(world.tracker);
+    ecs_fini(world.ecs);
+    zpl_mfree(world.data);
+    zpl_memset(&world, 0, sizeof(world));
+    zpl_printf("[INFO] World was destroyed.\n");
+    return WORLD_ERROR_NONE;
+}
+
+int32_t world_update() {
+    ecs_progress(world.ecs, 0);
+    return 0;
+}
+
+int32_t world_read(void* data, uint32_t datalen) {
+    if (world.reader_proc) {
+        return world.reader_proc(data, datalen);
+    }
+    return -1;
+}
+
+int32_t world_write(pkt_header *pkt) {
+    if (world.writer_proc) {
+        return world.writer_proc(pkt);
+    }
+    return -1;
+}
+
+uint32_t world_buf(uint8_t const **ptr, uint32_t *width) {
+    ZPL_ASSERT_NOT_NULL(world.data);
+    ZPL_ASSERT_NOT_NULL(ptr);
+    *ptr = world.data;
+    if (width) *width = world.width;
+    return world.size;
+}
+
+ecs_world_t * world_ecs() {
+    return world.ecs;
+}
+
+librg_world * world_tracker() {
+    return world.tracker;
+}
+
+uint16_t world_chunk_size(void) {
+    return world.chunk_size;
+}
+
+uint16_t world_chunk_amount(void) {
+    return world.world_size;
+}
+
+#include "world_gen.c"
diff --git a/code/common/world/world.h b/code/common/world/world.h
new file mode 100644
index 0000000..e66c69e
--- /dev/null
+++ b/code/common/world/world.h
@@ -0,0 +1,32 @@
+#pragma once
+#include "system.h"
+#include "librg.h"
+#include "packets/packet.h"
+#include "flecs/flecs.h"
+
+#define WORLD_ERROR_NONE                +0x0000
+#define WORLD_ERROR_OUTOFMEM            -0x0001
+#define WORLD_ERROR_INVALID_BLOCKS      -0x0002
+#define WORLD_ERROR_INVALID_DIMENSIONS  -0x0003
+#define WORLD_ERROR_INVALID_BUFFER      -0x0004
+#define WORLD_ERROR_TRACKER_FAILED      -0x0005
+
+#define WORLD_PKT_READER(name) int32_t name(void* data, uint32_t datalen)
+typedef WORLD_PKT_READER(world_pkt_reader_proc);
+
+#define WORLD_PKT_WRITER(name) int32_t name(pkt_header *pkt)
+typedef WORLD_PKT_WRITER(world_pkt_writer_proc);
+
+int32_t world_init_minimal(uint16_t block_size, uint16_t chunk_size, uint16_t world_size, world_pkt_reader_proc *reader_proc, world_pkt_writer_proc *writer_proc);
+int32_t world_init(int32_t seed, uint16_t block_size, uint16_t chunk_size, uint16_t world_size, world_pkt_reader_proc *reader_proc, world_pkt_writer_proc *writer_proc);
+int32_t world_destroy(void);
+int32_t world_update(void);
+int32_t world_read(void* data, uint32_t datalen);
+int32_t world_write(pkt_header *pkt);
+
+uint32_t world_buf(uint8_t const **ptr, uint32_t *width);
+ecs_world_t * world_ecs(void);
+librg_world * world_tracker(void);
+
+uint16_t world_chunk_size(void);
+uint16_t world_chunk_amount(void);
\ No newline at end of file
diff --git a/code/common/world/world_gen.c b/code/common/world/world_gen.c
new file mode 100644
index 0000000..d845a3d
--- /dev/null
+++ b/code/common/world/world_gen.c
@@ -0,0 +1,133 @@
+#include "zpl.h"
+
+#include <math.h>
+#include <stdlib.h>
+
+#include "world/world.h"
+#include "world/blocks.h"
+#include "world/perlin.h"
+
+#define WORLD_BLOCK_OBSERVER(name) uint32_t name(uint32_t id, uint32_t block_idx)
+typedef WORLD_BLOCK_OBSERVER(world_block_observer_proc);
+
+#define WORLD_PERLIN_FREQ    1.0
+#define WORLD_PERLIN_OCTAVES 1
+
+static void world_fill_rect(uint32_t id, uint32_t x, uint32_t y, uint32_t w, uint32_t h, world_block_observer_proc *proc) {
+    for (uint32_t cy=y; cy<y+h; cy++) {
+        for (uint32_t cx=x; cx<x+w; cx++) {
+            if (cx < 0 || cx >= world.width) continue;
+            if (cy < 0 || cy >= world.height) continue;
+            uint32_t i = (cy*world.width) + cx;
+
+            if (proc) {
+                uint32_t new_id = (*proc)(id, i);
+                if (new_id != BLOCK_INVALID) {
+                    id = new_id;
+                }
+                else continue;
+            }
+
+            world.data[i] = id;
+        }
+    }
+}
+
+static void world_fill_circle(uint32_t id, uint32_t x, uint32_t y, uint32_t w, uint32_t h, world_block_observer_proc *proc) {
+    for (uint32_t cy=y; cy<y+h; cy++) {
+        for (uint32_t cx=x; cx<x+w; cx++) {
+            if (cx < 0 || cx >= world.width) continue;
+            if (cy < 0 || cy >= world.height) continue;
+            uint32_t i = (cy*world.width) + cx;
+
+            if (proc) {
+                uint32_t new_id = (*proc)(id, i);
+                if (new_id != BLOCK_INVALID) {
+                    id = new_id;
+                }
+                else continue;
+            }
+
+            world.data[i] = id;
+        }
+    }
+}
+
+static void world_fill_rect_anchor(uint32_t id, uint32_t x, uint32_t y, uint32_t w, uint32_t h, float ax, float ay, world_block_observer_proc *proc) {
+    uint32_t w2 = (uint32_t)floorf(w*ax);
+    uint32_t h2 = (uint32_t)floorf(h*ay);
+    world_fill_rect(id, x-w2, y-h2, w, h, proc);
+}
+
+static WORLD_BLOCK_OBSERVER(shaper) {
+    uint32_t biome = blocks_get_biome(id);
+    uint32_t kind = blocks_get_kind(id);
+    uint32_t old_biome = blocks_get_biome(world.data[block_idx]);
+    uint32_t old_kind = blocks_get_kind(world.data[block_idx]);
+
+    if (biome == old_biome) {
+        if (kind == BLOCK_KIND_WALL && kind == old_kind) {
+            return blocks_find(biome, BLOCK_KIND_HILL);
+        }
+        if (kind == BLOCK_KIND_HILL && kind == old_kind) {
+            return blocks_find(biome, BLOCK_KIND_HILL_SNOW);
+        }
+    }
+
+    return id;
+}
+
+static uint8_t world_perlin_cond(uint32_t block_idx, double chance) {
+    uint32_t x = block_idx % world.width;
+    uint32_t y = block_idx / world.width;
+
+    return perlin_fbm(world.seed, x, y, WORLD_PERLIN_FREQ, WORLD_PERLIN_OCTAVES) < chance;
+}
+
+static WORLD_BLOCK_OBSERVER(shaper_noise80) {
+    return world_perlin_cond(block_idx, 0.80) ? shaper(id, block_idx) : BLOCK_INVALID;
+}
+
+static WORLD_BLOCK_OBSERVER(shaper_noise50) {
+    return world_perlin_cond(block_idx, 0.50) ? shaper(id, block_idx) : BLOCK_INVALID;
+}
+
+static WORLD_BLOCK_OBSERVER(shaper_noise33) {
+    return world_perlin_cond(block_idx, 0.33) ? shaper(id, block_idx) : BLOCK_INVALID;
+}
+
+static void world_fill_mountain(uint32_t x, uint32_t y) {
+
+}
+
+#define RAND_RANGE(x,y) (x + (int)rand()%(y-(x)))
+
+int32_t world_gen() {
+    // TODO: perform world gen
+    // atm, we will fill the world with ground and surround it by walls
+    uint32_t wall_id = blocks_find(BLOCK_BIOME_DEV, BLOCK_KIND_WALL);
+    uint32_t grnd_id = blocks_find(BLOCK_BIOME_DEV, BLOCK_KIND_GROUND);
+    uint32_t watr_id = blocks_find(BLOCK_BIOME_DEV, BLOCK_KIND_WATER);
+
+    srand(world.seed);
+
+    // walls
+    world_fill_rect(wall_id, 0, 0, world.width, world.height, NULL);
+
+    // ground
+    world_fill_rect(grnd_id, 1, 1, world.width-2, world.height-2, NULL);
+
+    // water
+    for (int i=0; i<RAND_RANGE(0, 12); i++) {
+        world_fill_rect_anchor(watr_id, RAND_RANGE(0, world.width), RAND_RANGE(0, world.height), 4+RAND_RANGE(0,3), 4+RAND_RANGE(0,3), 0.5f, 0.5f, shaper_noise33);
+    }
+
+    const uint32_t HILLS_SIZE = 21;
+
+    // hills
+    for (int i=0; i<RAND_RANGE(8, 224); i++) {
+        world_fill_rect_anchor(wall_id, RAND_RANGE(0, world.width), RAND_RANGE(0, world.height), RAND_RANGE(0,HILLS_SIZE), RAND_RANGE(0,HILLS_SIZE), 0.5f, 0.5f, shaper_noise33);
+    }
+
+    return WORLD_ERROR_NONE;
+}
diff --git a/code/modules/CMakeLists.txt b/code/modules/CMakeLists.txt
new file mode 100644
index 0000000..889cca7
--- /dev/null
+++ b/code/modules/CMakeLists.txt
@@ -0,0 +1,3 @@
+file(GLOB MODULES modules/*.h source/*.c)
+add_library(eco2d-modules STATIC ${MODULES})
+include_directories(.)
diff --git a/code/modules/modules/controllers.h b/code/modules/modules/controllers.h
new file mode 100644
index 0000000..9363743
--- /dev/null
+++ b/code/modules/modules/controllers.h
@@ -0,0 +1,28 @@
+#pragma once
+#include "flecs/flecs.h"
+#include "flecs/flecs_meta.h"
+
+ECS_STRUCT(Input, {
+    double x;
+    double y;
+    uint8_t use;
+});
+
+typedef struct {
+    ECS_DECLARE_COMPONENT(Input);
+    ECS_DECLARE_ENTITY(EcsActor);
+    ECS_DECLARE_ENTITY(EcsPlayer);
+    ECS_DECLARE_ENTITY(EcsBuilder);
+    ECS_DECLARE_TYPE(Player);
+    ECS_DECLARE_TYPE(Builder);
+} Controllers;
+
+#define ControllersImportHandles(handles)\
+    ECS_IMPORT_COMPONENT(handles, Input);\
+    ECS_IMPORT_TYPE(handles, Player);\
+    ECS_IMPORT_TYPE(handles, Builder);\
+    ECS_IMPORT_ENTITY(handles, EcsActor);\
+    ECS_IMPORT_ENTITY(handles, EcsPlayer);\
+    ECS_IMPORT_ENTITY(handles, EcsBuilder);\
+
+void ControllersImport(ecs_world_t *ecs);
diff --git a/code/modules/modules/general.h b/code/modules/modules/general.h
new file mode 100644
index 0000000..448168b
--- /dev/null
+++ b/code/modules/modules/general.h
@@ -0,0 +1,30 @@
+#pragma once
+#include "flecs/flecs.h"
+#include "flecs/flecs_meta.h"
+
+ECS_STRUCT(Vector2D, {
+    int16_t x;
+    int16_t y;
+});
+
+ECS_STRUCT(Drawable, {
+    uint16_t id;
+});
+
+ECS_ALIAS(Vector2D, Chunk);
+ECS_ALIAS(Vector2D, Position);
+
+typedef struct {
+    ECS_DECLARE_COMPONENT(Chunk);
+    ECS_DECLARE_COMPONENT(Position);
+    ECS_DECLARE_COMPONENT(Vector2D);
+    ECS_DECLARE_COMPONENT(Drawable);
+} General;
+
+#define GeneralImportHandles(handles)\
+    ECS_IMPORT_COMPONENT(handles, Chunk);\
+    ECS_IMPORT_COMPONENT(handles, Vector2D);\
+    ECS_IMPORT_COMPONENT(handles, Position);\
+    ECS_IMPORT_COMPONENT(handles, Drawable);\
+
+void GeneralImport(ecs_world_t *ecs);
diff --git a/code/modules/modules/net.h b/code/modules/modules/net.h
new file mode 100644
index 0000000..349b6bc
--- /dev/null
+++ b/code/modules/modules/net.h
@@ -0,0 +1,18 @@
+#pragma once
+#include "flecs/flecs.h"
+#include "flecs/flecs_meta.h"
+
+ECS_STRUCT(ClientInfo, {
+    uint16_t peer_id;
+});
+
+typedef struct {
+    ECS_DECLARE_ENTITY(EcsClient);
+    ECS_DECLARE_COMPONENT(ClientInfo);
+} Net;
+
+#define NetImportHandles(handles)\
+    ECS_IMPORT_ENTITY(handles, EcsClient);\
+    ECS_IMPORT_COMPONENT(handles, ClientInfo);\
+
+void NetImport(ecs_world_t *ecs);
diff --git a/code/modules/modules/physics.h b/code/modules/modules/physics.h
new file mode 100644
index 0000000..031247f
--- /dev/null
+++ b/code/modules/modules/physics.h
@@ -0,0 +1,23 @@
+#pragma once
+#include "flecs/flecs.h"
+
+#include "modules/general.h"
+
+typedef Vector2D Velocity;
+
+typedef struct {
+    ECS_DECLARE_TYPE(Movement);
+    ECS_DECLARE_ENTITY(Walking);
+    ECS_DECLARE_ENTITY(Flying);
+    ECS_DECLARE_COMPONENT(Velocity);
+    ECS_DECLARE_ENTITY(MoveWalk);
+} Physics;
+
+#define PhysicsImportHandles(handles)\
+    ECS_IMPORT_TYPE(handles, Movement);\
+    ECS_IMPORT_ENTITY(handles, Walking);\
+    ECS_IMPORT_ENTITY(handles, Flying);\
+    ECS_IMPORT_COMPONENT(handles, Velocity);\
+    ECS_IMPORT_ENTITY(handles, MoveWalk);\
+
+void PhysicsImport(ecs_world_t *ecs);
diff --git a/code/modules/source/controllers.c b/code/modules/source/controllers.c
new file mode 100644
index 0000000..5f67ea5
--- /dev/null
+++ b/code/modules/source/controllers.c
@@ -0,0 +1,30 @@
+#include "modules/controllers.h"
+
+#include "modules/general.h"
+#include "modules/physics.h"
+
+void ControllersImport(ecs_world_t *ecs) {
+    ECS_MODULE(ecs, Controllers);
+    ecs_set_name_prefix(ecs, "Controllers");
+
+    ECS_IMPORT(ecs, General);
+    ECS_IMPORT(ecs, Physics);
+
+    ECS_IMPORT(ecs, FlecsMeta);
+    ECS_META(ecs, Input);
+
+    ECS_TAG(ecs, EcsActor);
+    ECS_TAG(ecs, EcsPlayer);
+    ECS_TAG(ecs, EcsBuilder);
+
+    ECS_PREFAB(ecs, Base, general.Position, physics.Velocity, Input, EcsActor);
+    ECS_TYPE(ecs, Player, INSTANCEOF | Base, SWITCH | physics.Movement, CASE | physics.Walking, EcsActor, EcsPlayer);
+    ECS_TYPE(ecs, Builder, INSTANCEOF | Base, SWITCH | physics.Movement, CASE | physics.Flying, EcsActor, EcsBuilder);
+
+    ECS_SET_COMPONENT(Input);
+    ECS_SET_ENTITY(EcsActor);
+    ECS_SET_ENTITY(EcsPlayer);
+    ECS_SET_ENTITY(EcsBuilder);
+    ECS_SET_TYPE(Builder);
+    ECS_SET_TYPE(Player);
+}
diff --git a/code/modules/source/general.c b/code/modules/source/general.c
new file mode 100644
index 0000000..5aa3411
--- /dev/null
+++ b/code/modules/source/general.c
@@ -0,0 +1,19 @@
+#include "modules/general.h"
+
+void GeneralImport(ecs_world_t *ecs) {
+    ECS_MODULE(ecs, General);
+    ecs_set_name_prefix(ecs, "General");
+
+    ECS_COMPONENT(ecs, Chunk);
+    ECS_COMPONENT(ecs, Position);
+
+    ECS_IMPORT(ecs, FlecsMeta);
+
+    ECS_META(ecs, Vector2D);
+    ECS_META(ecs, Drawable);
+
+    ECS_SET_COMPONENT(Chunk);
+    ECS_SET_COMPONENT(Vector2D);
+    ECS_SET_COMPONENT(Position);
+    ECS_SET_COMPONENT(Drawable);
+}
diff --git a/code/modules/source/net.c b/code/modules/source/net.c
new file mode 100644
index 0000000..084441c
--- /dev/null
+++ b/code/modules/source/net.c
@@ -0,0 +1,16 @@
+#include "modules/net.h"
+
+void NetImport(ecs_world_t *ecs) {
+    ECS_MODULE(ecs, Net);
+
+    ecs_set_name_prefix(ecs, "Net");
+
+    ECS_TAG(ecs, EcsClient);
+
+    ECS_IMPORT(ecs, FlecsMeta);
+
+    ECS_META(ecs, ClientInfo);
+
+    ECS_EXPORT_ENTITY(EcsClient);
+    ECS_EXPORT_COMPONENT(ClientInfo);
+}
diff --git a/code/modules/source/physics.c b/code/modules/source/physics.c
new file mode 100644
index 0000000..e9c6fe5
--- /dev/null
+++ b/code/modules/source/physics.c
@@ -0,0 +1,31 @@
+#include "modules/physics.h"
+
+void MoveWalk(ecs_iter_t *it) {
+    Position *p = ecs_column(it, Position, 1);
+    Velocity *v = ecs_column(it, Velocity, 2);
+
+    for (int i = 0; i < it->count; i++) {
+        // TODO: handle collisions
+        p[i].x += v[i].x * it->delta_time;
+        p[i].y += v[i].y * it->delta_time;
+    }
+}
+
+void PhysicsImport(ecs_world_t *ecs) {
+    ECS_MODULE(ecs, Physics);
+    ecs_set_name_prefix(ecs, "Physics");
+
+    ECS_TAG(ecs, Walking);
+    ECS_TAG(ecs, Flying);
+    ECS_TYPE(ecs, Movement, Walking, Flying);
+
+    ECS_COMPONENT(ecs, Velocity);
+
+    ECS_SYSTEM(ecs, MoveWalk, EcsOnUpdate, general.Position, Velocity, SWITCH | Movement, CASE | Walking);
+
+    ECS_SET_TYPE(Movement);
+    ECS_SET_ENTITY(Walking);
+    ECS_SET_ENTITY(Flying);
+    ECS_SET_COMPONENT(Velocity);
+    ECS_SET_ENTITY(MoveWalk);
+}