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#include "cub3d.h"
t_state *create_state(void *mlx_ptr, void *window_ptr, t_parsing *parsing)
{
t_state *state;
if ((state = (t_state*)malloc(sizeof(t_state))) == NULL)
return (NULL);
state->mlx_ptr = mlx_ptr;
state->window_ptr = window_ptr;
state->window_width = parsing->resolution_width;
state->window_height = parsing->resolution_height;
state->running = TRUE;
state->pos.x = 1.0;
state->pos.y = 1.0;
state->dir.x = 1.0;
state->dir.y = 0.0;
state->plane.x = 0.0;
state->plane.y = 0.66;
state->map = parsing->map;
state->map_width = parsing->map_width;
state->map_height = parsing->map_height;
return (state);
}
int graphics_update(void *param)
{
t_state *state = param;
if (!state->running)
{
mlx_destroy_window(state->mlx_ptr, state->window_ptr);
exit(0);
}
/* int color = 0x00FFFFFF; */
/* int x = state->pos.x; */
/* int y = state->pos.y; */
/* for (int i = 0; i < 4; i++) */
/* for (int j = 0; j < 4; j++) */
/* mlx_pixel_put(state->mlx_ptr, state->window_ptr, x + i - 2,y + j - 2, 0x00ffffff); */
/* int x2 = state->dir.x; */
/* int y2 = state->dir.y; */
/* for (int i = 0; i < 4; i++) */
/* for (int j = 0; j < 4; j++) */
/* mlx_pixel_put(state->mlx_ptr, state->window_ptr, x + x2 + i - 2,y + y2 + j - 2, 0x00ffff00); */
int x;
x = -1;
while (++x < state->window_width)
draw_column(state, x);
return (0);
}
typedef enum
{
SIDE_NORTH_SOUTH,
SIDE_WEST_EAST
} t_side;
void draw_column(t_state *state, int x)
{
/*
* -1 0 1
* v v v
* ####################
* # | #
* # | #
* # | #
* # | #
* # | #
* ####################
*/
double camera_x = 2 * x / (double)state->window_width - 1;
/* camera plane length related to current column */
t_vector ray;
ray = vector_add(state->dir, vector_scale(state->plane, camera_x));
/* ray.x = state->dir.x + state->plane.x * camera_x; */
/* ray.y = state->dir.y + state->plane.y * camera_x; */
/* printf("[%f %f]\n", ray.x, ray.y); */
/* map pos*/
int map_x = (int)state->pos.x;
int map_y = (int)state->pos.y;
/* dist to first encounter wall */
double side_dist_x;
double side_dist_y;
/* delta between grid lines from ray percepective */
double delta_dist_x = fabs(1.0 / ray.x);
double delta_dist_y = fabs(1.0 / ray.y);
/* dist to wall (perpendicular to avoid fisheye effect) */
double perp_wall_dist;
/* step on size for the `map_. +=` */
int map_step_x = ray.x < 0 ? -1 : 1;
int map_step_y = ray.y < 0 ? -1 : 1;
if (ray.x < 0)
side_dist_x = (state->pos.x - map_x) * delta_dist_x;
else
side_dist_x = (map_x + 1.0 - state->pos.x) * delta_dist_x;
if (ray.y < 0)
side_dist_y = (state->pos.y - map_y) * delta_dist_y;
else
side_dist_y = (map_y + 1.0 - state->pos.y) * delta_dist_y;
t_side side;
int hit = FALSE;
while (!hit)
{
if (side_dist_x < side_dist_y)
{
side_dist_x += delta_dist_x; /* increment real dist */
map_x += map_step_x; /* increment map dist */
side = SIDE_WEST_EAST;
}
else
{
side_dist_y += delta_dist_y;
map_y += map_step_y;
side = SIDE_NORTH_SOUTH;
}
if (state->map[map_y][map_x] == CELL_WALL)
break;
}
if (side == SIDE_WEST_EAST)
perp_wall_dist = (map_x - state->pos.x + (1 - map_step_x) / 2) / ray.x;
else //if (side == SIDE_NORTH_SOUTH)
perp_wall_dist = (map_y - state->pos.y + (1 - map_step_y) / 2) / ray.y;
int line_height = (int)(state->window_height / perp_wall_dist);
int draw_start = -line_height / 2 + state->window_height / 2;
if (draw_start < 0)
draw_start = 0;
int draw_end = line_height / 2 + state->window_height / 2;
if (draw_end >= state->window_height)
draw_end = state->window_height - 1;
for (int i = draw_start; i < draw_end; i++)
mlx_pixel_put(state->mlx_ptr, state->window_ptr, x, i, 0x00ffffff);
}
t_vector vector_add(t_vector a, t_vector b)
{
a.x += b.x;
a.y += b.y;
return a;
}
t_vector vector_scale(t_vector v, double scalar)
{
v.x *= scalar;
v.y *= scalar;
return v;
}
/* sqrt( x^2 + y^2 ) / x */
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