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#include "cub3d.h"
int render_update(void *param)
{
int x;
t_state *state;
state = param;
if (!state->running)
{
state_destroy(state);
exit(0);
}
mlx_clear_window(state->mlx_ptr, state->window_ptr);
x = -1;
while (++x < state->window_width)
render_column(state, x);
/* for (int i = 0; i < 200000; i++) */
/* state->window_img.data[i] = 127; */
mlx_put_image_to_window(state->mlx_ptr, state->window_ptr, state->window_img.id, 0, 0);
/* mlx_put_image_to_window(state->mlx_ptr, state->window_ptr, state->north_texture.id, 0, 0); */
/* for (int i = 0; i < 200; i++) */
/* printf("%d ", state->window_img.data[i]); */
return (0);
}
void render_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 encountered wall */
double side_dist_x;
double side_dist_y;
/* delta between grid lines from ray percepective */
double delta_dist_x = sqrt(1 + (SQUARE(ray.y) / SQUARE(ray.x))); //fabs(1.0 / ray.x);
double delta_dist_y = sqrt(1 + (SQUARE(ray.x) / SQUARE(ray.y))); //hfabs(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;
side_dist_x = ray.x < 0 ? state->pos.x - map_x : map_x + 1.0 - state->pos.x;
side_dist_x *= delta_dist_x;
side_dist_y = ray.y < 0 ? state->pos.y - map_y : map_y + 1.0 - state->pos.y;
side_dist_y *= delta_dist_y;
t_side side;
while (TRUE)
{
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 = ((double)map_x - state->pos.x + (map_step_x == -1 ? 1 : 0)) / ray.x;
else //if (side == SIDE_NORTH_SOUTH)
perp_wall_dist = ((double)map_y - state->pos.y + (map_step_y == -1 ? 1 : 0)) / ray.y;
/* perp_wall_dist = sqrt(SQUARE(state->pos.x - side_dist_x) + SQUARE(state->pos.y - side_dist_y)); */
int line_height;
/* if (perp_wall_dist <= 0) */
/* line_height = state->window_height; */
/* else */
line_height = (int)(state->window_height / perp_wall_dist);
/* printf("%f\n", perp_wall_dist); */
/* printf("%d\n", line_height); */
int draw_start = state->window_height / 2 - line_height / 2;
if (draw_start < 0)
draw_start = 0;
int draw_end = state->window_height / 2 + line_height / 2;
if (draw_end >= state->window_height)
draw_end = state->window_height - 1;
/* int tex_x; */
/* int wall_x = side == SIDE_WEST_EAST ? pos */
/* t_vector unit_ray = vector_scale(ray, 1.0 / vector_norm(ray)); */
/* t_vector dist_v = vector_scale(unit_ray, side == SIDE_WEST_EAST ? side_dist_y : side_dist_x); */
/* printf("[%f %f]\n", dist_v.x, dist_v.y); */
/* #<{(| printf("[%f %f]\n", dist_v.x, dist_v.y); |)}># */
/* */
/* double mod = side == SIDE_WEST_EAST ? dist_v.y : dist_v.x; */
/* mod = fabs(mod); */
/* mod -= floor(mod); */
/* tex_x = (int)map_range(side == SIDE_WEST_EAST ? dist_v.y : dist_v.x, 0, 1, 0, state->north_texture.width); */
/* tex_x = side = SIDE_WEST_EAST ? side_dist_y : side_dist_x) */
/* printf("%d\n", tex_x); */
/* double wall_x; */
/* if (side == SIDE_WEST_EAST) */
/* wall_x = pos_y + prep_wall_dist * ray.y; */
/* else */
/* wall_x = pos_x + prep_wall_dist * ray.x; */
/* wall_x -= floor(wall_x); */
int i;
i = 0;
t_color white;
white.hexcode = 0x00ffffff;
while (i < draw_start)
((t_color*)state->window_img.data)[i++ * state->window_img.width + x] = state->ceilling_color;
while (i < draw_end)
((t_color*)state->window_img.data)[i++ * state->window_img.width + x] = white;
while (i < state->window_height)
((t_color*)state->window_img.data)[i++ * state->window_img.width + x] = state->floor_color;
}
/* double map_range(double x, double src_lo, double src_hi, double dest_lo, double dest_hi) */
/* { */
/* double src_len = src_hi - src_lo; */
/* double dest_len = dest_hi - dest_lo; */
/* return ((x - src_lo) / src_len) * dest_len + dest_lo; */
/* } */
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