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// SPDX-FileCopyrightText: 2024 Lizzy Fleckenstein <lizzy@vlhl.dev>
//
// SPDX-License-Identifier: AGPL-3.0-or-later
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <sys/select.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdint.h>
#include <png.h>
#include <endian.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "content.h"
#include "peer.h"
#include "str.h"
typedef enum {
MAP_VALLEY,
MAP_ISLAND,
MAP_MOUNTAIN,
MAP_CAVE,
MAP_NUM,
} map_type;
typedef struct {
const char *filename;
str name;
map_type type;
uint32_t width;
uint32_t height;
int32_t off_x;
int32_t off_y;
int8_t z; // caves: -1
node *nodes;
} map;
typedef struct {
str motd;
array(map) maps;
} game;
typedef struct {
str name;
int32_t x, y;
peer net;
} player;
node *map_local_node(map *m, int32_t x, int32_t y)
{
if (x < 0 || y < 0 || (uint32_t) x >= m->width || (uint32_t) y >= m->height)
return NULL;
node *n = &m->nodes[x*m->width+y];
if (!n->present)
return NULL;
return n;
}
node *map_node(game *g, int32_t x, int32_t y, int8_t z)
{
for (size_t i = 0; i < g->maps.len; i++) {
map *m = &g->maps.data[i];
if (m->z != z)
continue;
node *n = map_local_node(m, x - m->off_x, y - m->off_y);
if (n != NULL)
return n;
}
return NULL;
}
/*
void map_load_node(map *m, uint32_t x, uint32_t y, uint32_t color)
{
}*/
bool map_load(map *m)
{
#define TRY(expr, ...) if (!(expr)) { \
fprintf(stderr, __VA_ARGS__); \
if (file != NULL) fclose(file); \
png_destroy_read_struct(&png, &info, NULL); \
return false; }
FILE *file = NULL;
png_structp png = NULL;
png_infop info = NULL;
TRY((file = fopen(m->filename, "r")) != NULL, "failed to open %s\n", m->filename);
TRY(png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL),
"png_create_read_struct failed\n");
TRY(info = png_create_info_struct(png), "png_create_info_struct failed\n");
png_init_io(png, file);
png_read_info(png, info);
png_uint_32 width = png_get_image_width(png, info);
png_uint_32 height = png_get_image_height(png, info);
png_byte color_type = png_get_color_type(png, info);
TRY(width == m->width, "%s: width mismatch\n", m->filename);
TRY(height == m->height, "%s: height mismatch\n", m->filename);
TRY(color_type == PNG_COLOR_TYPE_RGB, "%s: color type is not RGB\n", m->filename);
uint32_t colors[100] = {0};
png_uint_32 pitch = png_get_rowbytes(png, info);
png_byte row[pitch];
for (png_uint_32 y = 0; y < height; y++) {
png_read_row(png, row, NULL);
for (png_uint_32 x = 0; x < width; x++) {
png_bytep p = &row[x*3];
uint32_t color = ((uint32_t) p[2]) | (((uint32_t) p[1]) << 8) | (((uint32_t) p[0]) << 16);
for (size_t i = 0; i < 100; i++) {
if (colors[i] == color) {
break;
} else if (colors[i] == 0) {
colors[i] = color;
printf("#%06x\n", color);
break;
}
}
}
}
fclose(file);
png_destroy_read_struct(&png, &info, NULL);
return true;
#undef TRY
}
int net_listen(const char *host, const char *port)
{
struct addrinfo *info = NULL, hints = {0};
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
int err;
if ((err = getaddrinfo(host, port, &hints, &info))) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(err));
return -1;
}
#define TRY(op, val) if ((val) < 0) { perror(op); freeaddrinfo(info); return -1; }
int fd;
TRY("socket", fd = socket(info->ai_family, info->ai_socktype, info->ai_protocol))
int flag = 1;
TRY("setsockopt", setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *) &flag, sizeof flag));
TRY("bind", bind(fd, info->ai_addr, info->ai_addrlen))
TRY("listen", listen(fd, 3))
#undef TRY
freeaddrinfo(info);
return fd;
}
int game_exit(game *g, int ret)
{
free(g->motd.data);
if (g->maps.data)
for (size_t i = 0; i < g->maps.len; i++) {
free(g->maps.data[i].name.data);
free(g->maps.data[i].nodes);
}
free(g->maps.data);
exit(ret);
}
int main()
{
game g = {0};
g.motd = str_clone(S("Welcome to test server"));
g.maps.len = 1;
g.maps.data = malloc(g.maps.len * sizeof *g.maps.data);
g.maps.data[0] = (map) {
.filename = "assets/map_valley.png",
.name = str_clone(S("Valley")),
.type = MAP_VALLEY,
.off_x = -50,
.off_y = -50,
.z = 0,
.width = 100,
.height = 100,
.nodes = NULL,
};
if (!map_load(&g.maps.data[0]))
game_exit(&g, EXIT_FAILURE);
int accept_fd = net_listen("0.0.0.0", "4560");
if (accept_fd < 0)
game_exit(&g, EXIT_FAILURE);
for (;;) {
int clt_sock = accept(accept_fd, NULL, NULL);
if (clt_sock < 0) {
perror("accept");
continue;
}
if (fcntl(clt_sock, F_SETFL, fcntl(clt_sock, F_GETFL, 0) | O_NONBLOCK) < 0) {
perror("fcntl");
continue;
}
}
}
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