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Cub3D/srcs/cast_ray.c

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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* cast_ray.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: apommier <apommier@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/05/04 18:08:14 by apommier #+# #+# */
/* Updated: 2022/05/20 15:48:23 by apommier ### ########.fr */
/* */
/* ************************************************************************** */
#include "../includes/Cub3D.h"
void print_ray2(t_data *img, double vx, double vy, double dist)
{
int i = -1;
int red = 0;
//printf("in print ray2\n");
red = red << 8;
red +=255;
red = red << 8;
red = red << 8;
while (++i < dist)
{
mlx_pixel_put(img->mlx_test, img->mlx_win_test, (img->player.x + (vx) * i) , (img->player.y + (vy) * i) , red);
mlx_pixel_put(img->mlx_test, img->mlx_win_test, (img->player.x + (vx) * i) + 1, (img->player.y + (vy) * i) , red);
mlx_pixel_put(img->mlx_test, img->mlx_win_test, (img->player.x + (vx) * i) , (img->player.y + (vy) * i) + 1, red);
}
}
int get_color(char R, char G, char B)
{
int color = 0;
//printf("R= %d G= %d B= %d\n", R, G, B);
color = color << 8;
color += R;
//printf("color= %d\n", color);
color = color << 8;
color += G;
//printf("color= %d\n", color);
color = color << 8;
color += B;
//printf("color= %d\n", color);
return (color);
}
int get_red()
{
int red = 0;
red = red << 8;
red +=255;
red = red << 8;
red = red << 8;
return (red);
}
int get_dark_red()
{
int red = 0;
red = red << 8;
red +=139;
red = red << 8;
red = red << 8;
return (red);
}
void set_pixel(t_data *img, int color, int x, int y)
{
int pixel;
//int R;
//int G;
//int B;
//printf("color in set = %d\n", color);
/*color = color >> 24;
printf("color= %d\n", color);
//color += R;
color = color >> 16;
printf("color= %d\n", color);
//color += G;
color = color >> 8;
printf("color= %d\n", color);
//color += B;*/
//printf("1= %d 2= %d 3= %d 4= %d\n", (color >> 24) & 0xFF, (color >> 16) & 0xFF, (color >> 8) & 0xFF, (color) & 0xFF);
if (y < 0 || y > 520 || x < 0 || x > 960)
return ;
pixel = (y * img->size_line) + (x * 4);
//printf("x= %d y= %d pixel value= %d tabsize = %d\n", x, y, pixel, 512 * 960 * 4);
if (img->endian == 1) // Most significant (Alpha) byte first
{
img->buffer[pixel + 0] = 0;
img->buffer[pixel + 1] = (color >> 16) & 0xFF;
img->buffer[pixel + 2] = (color >> 8) & 0xFF;
img->buffer[pixel + 3] = (color) & 0xFF;
}
else if (img->endian == 0) // Least significant (Blue) byte first
{
img->buffer[pixel + 0] = (color) & 0xFF;
img->buffer[pixel + 1] = (color >> 8) & 0xFF;
img->buffer[pixel + 2] = (color >> 16) & 0xFF;
img->buffer[pixel + 3] = 0;
}
}
void draw_ray3d(t_data *img, ray ray)
{
double line_height;
double line_offset;
int x = 0;
double y = 0;
int mx = 0;
int my = 0;
int color;
int texture_size = 64;
line_height = img->map.size * 960 / ray.dist;
if (line_height > 5000)
line_height = 5000;
line_offset = 256 - line_height / 2;
double gap = 1;
double myy = 0;
y = 0;
my = 0;
myy = 0;
gap = (texture_size / line_height);
mx = ((int)ray.mp) % texture_size;
while (y < line_height - 8)
{
myy += gap;
my = (int)myy;//gap;
ray.pixel = ((my) * texture_size + mx)* 3 + 1;
x = -1;
if (ray.pixel > 12186)
color = 0;
else
color = get_color(img->map.texture.north[ray.pixel], img->map.texture.north[ray.pixel + 1], img->map.texture.north[ray.pixel + 2]);
while (++x < 4)
{
if (ray.wall_type)
{
//mlx_pixel_put(img->mlx, img->mlx_win, ray.index * 4 + x, y + line_offset , color);
set_pixel(img, color, ray.index * 4 + x, y + line_offset);
}
else
{
//mlx_pixel_put(img->mlx, img->mlx_win, ray.index * 4 + x, y + line_offset , (color >> 1) & 8355711);
set_pixel(img, (color >> 1) & 8355711, ray.index * 4 + x, y + line_offset);
}
}
y++;
}
x++;
}
void draw_ray(t_data *img)
{
double ray_angle = 0; //ray angle
double ray_y = 0; //where ray touch x
double ray_x = 0; //where ray touch y
double next_x = 0;
double next_y = 0;
double dist_v;
double dist_h;
double dist_f;
double vx = 0;
double vy = 0;
int count = 0;
double aTan = 0;
int nb_ray = -1;
int my = 0;
int mx = 0;
int mp = 0;
void *new_img;
int bits_per_pixel = 0;
int size_line = 0;
int endian = 0;
new_img = mlx_new_image(img->mlx, 960, 512);
if (!new_img)
{
printf("no img\n");
exit(1);
}
//printf("newimg= %p\n", new_img);
img->buffer = mlx_get_data_addr(new_img, &bits_per_pixel, &size_line, &endian);
//img->buffer// = (char*)new_img;
//printf("buffer= %p\n", img->buffer);
//printf("buffer in string= %s\n", (char *)img->buffer);
//printf("bits= %d line_size= %d endian = %d\n", bits_per_pixel, size_line, endian);
//mlx_destroy_image(img->mlx, new_img);
img->bits_per_pixel = bits_per_pixel;
img->size_line = size_line;
img->endian = endian;
set_back(img);
(void)dist_f;
count = 0;
ray_angle = reset_angle(img->player.angle + 30);
while (++nb_ray < 240)
{
count = 0;
dist_v = -1;
dist_h = -1;
//----------start vertical ray----------
aTan = tan(deg_to_rad(ray_angle));
if (cos(deg_to_rad(ray_angle)) > 0.001)//looking left
{
ray_x = (((int)img->player.x>>6)<<6) + 64;
ray_y = (img->player.x - ray_x) * aTan + img->player.y;
next_x = 64;
next_y = -next_x * aTan;
}
else if (cos(deg_to_rad(ray_angle)) < -0.001)//looking right
{
ray_x = (((int)img->player.x>>6)<<6) - 0.0001;
ray_y = (img->player.x - ray_x) * aTan + img->player.y;
next_x = -64;
next_y = -next_x * aTan;
}
else
{
ray_x = img->player.x;
ray_y = img->player.y;
count = 8;
}
while (count < 8)
{
//printf("count = %d\n", count);
mx = (int)(ray_x)>>6;
my = (int)(ray_y)>>6;
mp = my * img->map.x + mx;
//printf("mx=%d my=%d mp= %d\n", mx, my, mp);
if (mp > 0 && mp < img->map.x * img->map.y && img->map.simple_map[mp] == '1')//hit wall
{
count = 8;
//printf("vertical wall\n");
dist_v = cos(deg_to_rad(ray_angle)) * (ray_x-img->player.x) - sin(deg_to_rad(ray_angle)) * (ray_y-img->player.y);
}
else
{
ray_x += next_x;
ray_y += next_y;
count += 1;
}
}
//print_ray2(img, img->player.vx, img->player.vy, dist_v);
vx = ray_x;
vy = ray_y;
//-------start horizontal ray---------
count = 0;
aTan = 1.0 / aTan;
if (sin(deg_to_rad(ray_angle)) > 0.001)//looking up
{
ray_y = (((int)img->player.y>>6)<<6) - 0.0001;
ray_x = (img->player.y - ray_y) * aTan + img->player.x;
next_y = -64;
next_x = -next_y * aTan;
}
else if (sin(deg_to_rad(ray_angle))<-0.001)//looking down
{
ray_y = (((int)img->player.y>>6)<<6) + 64;
ray_x = (img->player.y - ray_y) * aTan + img->player.x;
next_y = 64;
next_x = -next_y * aTan;
}
else
{
ray_x = img->player.x;
ray_y = img->player.y;
count = 8;
}//looking straight left or right
while (count < 8)
{
mx = (int)(ray_x)>>6;
my = (int)(ray_y)>>6;
mp = my * img->map.x + mx;
if (mp > 0 && mp < img->map.x * img->map.y && img->map.simple_map[mp] == '1')//hit
{
count = 8;
dist_h = cos(deg_to_rad(ray_angle)) * (ray_x - img->player.x) - sin(deg_to_rad(ray_angle)) * (ray_y - img->player.y);
}
else
{
ray_x += next_x;
ray_y += next_y;
count += 1;
} //check next horizontal
}
int wall_type;
ray ray_info;
if (dist_h != -1 && (dist_h < dist_v || dist_v == -1))
{
//print_ray2(img, cos(deg_to_rad(ray_angle)), -sin(deg_to_rad(ray_angle)), fabs(dist_h));
dist_f = dist_h;
//printf("rx= %f ry= %f\n", ray_x, ray_y);
ray_info.mp = ray_x;
wall_type = 0;
}
else if (dist_v != -1)
{
dist_f = dist_v;
//printf("vx= %f vy= %f\n", vx, vy);
ray_x = vx;
ray_y = vy;
ray_info.mp = vy;
//print_ray2(img, cos(deg_to_rad(ray_angle)), -sin(deg_to_rad(ray_angle)), fabs(dist_v));
wall_type = 1;
}
else
dist_f = 0;
ray_info.ty = ray_y;
ray_info.tx = ray_x;
ray_info.index = nb_ray;
ray_info.wall_type = wall_type;
int ca = reset_angle(img->player.angle - ray_angle); //fisheye
dist_f = dist_f * cos(deg_to_rad(ca));
ray_info.dist = dist_f; //fisheye
draw_ray3d(img, ray_info);
ray_angle = reset_angle(ray_angle - 0.25);
}
mlx_put_image_to_window(img->mlx, img->mlx_win, new_img, 0, 0);
}
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