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#include <locale.h>
#include <math.h>
#include <stdio.h>
#include <unistd.h>
#include "framebuffer.h"
#include "map.h"
int main(void) {
setlocale(LC_ALL,"");
term_init();
Framebuffer fb = fb_new(term_width, term_height);
fb_clear(fb);
double pos_x = 15, pos_y = 15; /* Player pos */
double dir_x = -1, dir_y = 0; /* Player direction vector */
double plane_x = 0, plane_y = 1; /* Player camera plane vector, perpendicular to dir vector */
Map map = map_default();
/* TODO: figure out the clock */
while(1) {
for (size_t x = 0; x < term_width; x++) {
double cam_x = 2 * x / (double)term_width - 1;
double raydir_x = dir_x + plane_x * cam_x;
double raydir_y = dir_y + plane_y * cam_x;
size_t map_x = (size_t) pos_x;
size_t map_y = (size_t) pos_y;
double sidedist_x, sidedist_y;
double deltadist_x = (raydir_x == 0) ? 1e30 : fabs(1 / raydir_x);
double deltadist_y = (raydir_y == 0) ? 1e30 : fabs(1 / raydir_y);
int step_x, step_y;
int hit = 0;
int side;
if (raydir_x < 0) {
step_x = -1;
sidedist_x = (pos_x - map_x) * deltadist_x;
} else {
step_x = 1;
sidedist_x = (map_x + 1.0 - pos_x) * deltadist_x;
}
if (raydir_y < 0) {
step_y = -1;
sidedist_y = (pos_y - map_y) * deltadist_y;
} else {
step_y = 1;
sidedist_y = (map_y + 1.0 - pos_y) * deltadist_y;
}
/* DDA */
while (!hit) {
if (sidedist_x < sidedist_y) {
sidedist_x += deltadist_x;
map_x += step_x;
side = 0;
} else {
sidedist_y += deltadist_y;
map_y += step_y;
side = 1;
}
if (map.tiles[map_y][map_x].ch != '\0') hit = 1;
}
double dist;
if (side == 0) dist = sidedist_x - deltadist_x;
else dist = sidedist_y - deltadist_y;
int lineheight = term_height / dist;
int line_start = -lineheight / 2 + term_height / 2;
if (line_start < 0) line_start = 0;
int line_end = lineheight / 2 + term_height / 2;
if ((size_t)line_end >= term_height) line_end = term_height - 1;
Pixel p = map.tiles[map_y][map_x];
if (side == 1) {
p.fg.r /= 2;
p.fg.g /= 2;
p.fg.b /= 2;
p.bg.r /= 2;
p.bg.g /= 2;
p.bg.b /= 2;
}
fb_vert_line(fb, x, line_start, line_end, p);
}
fb_print(fb);
fb_clear(fb);
char c;
double old_dir_x;
double old_plane_x;
if(get_input(c)) {
switch (c) {
case 'q': goto quit; break;
case 'w':
if(map.tiles[(size_t)(pos_y)][(size_t)(pos_x + dir_x * 0.1)].ch == '\0') pos_x += dir_x * 0.1;
if(map.tiles[(size_t)(pos_y + dir_y * 0.1)][(size_t)(pos_x)].ch == '\0') pos_y += dir_y * 0.1;
break;
case 's':
if(map.tiles[(size_t)(pos_y)][(size_t)(pos_x - dir_x * 0.1)].ch == '\0') pos_x -= dir_x * 0.1;
if(map.tiles[(size_t)(pos_y - dir_y * 0.1)][(size_t)(pos_x)].ch == '\0') pos_y -= dir_y * 0.1;
break;
/* TODO: figure out strafing
case 'a': pos_y -= 1; break;
case 'd': pos_y += 1; break;
*/
case 'j':
old_dir_x = dir_x;
dir_x = dir_x * cos(M_PI / 12) - dir_y * sin(M_PI / 12);
dir_y = old_dir_x * sin(M_PI / 12) + dir_y * cos(M_PI / 12);
old_plane_x = plane_x;
plane_x = plane_x * cos(M_PI / 12) - plane_y * sin(M_PI / 12);
plane_y = old_plane_x * sin(M_PI / 12) + plane_y * cos(M_PI / 12);
break;
case 'l':
old_dir_x = dir_x;
dir_x = dir_x * cos(-M_PI / 12) - dir_y * sin(-M_PI / 12);
dir_y = old_dir_x * sin(-M_PI / 12) + dir_y * cos(-M_PI / 12);
old_plane_x = plane_x;
plane_x = plane_x * cos(-M_PI / 12) - plane_y * sin(-M_PI / 12);
plane_y = old_plane_x * sin(-M_PI / 12) + plane_y * cos(-M_PI / 12);
break;
}
}
}
quit:
map_free(&map);
fb_free(&fb);
term_cleanup();
}
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