244 lines
8.3 KiB
C
244 lines
8.3 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* raycast.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: jle-neze <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2025/09/12 18:24:37 by jle-neze #+# #+# */
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/* Updated: 2025/10/26 02:20:06 by lfirmin ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "cub.h"
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// /* petite fonction utilitaire: trace une ligne verticale remplie */
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// void draw_vline(t_game *g, int x, int y0, int y1, int color)
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// {
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// if (y0 < 0) y0 = 0;
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// if (y1 >= g->gfx.h) y1 = g->gfx.h - 1;
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// for (int y = y0; y <= y1; y++)
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// img_put_pixel(&g->gfx.frame, x, y, color);
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// }
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/* Version 1: simple couleurs */
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// void raycast_frame(t_game *g)
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// {
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// for (int x = 0; x < g->gfx.w; x++)
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// {
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// double camera_x = 2.0 * x / (double)g->gfx.w - 1.0;
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// double ray_dir_x = g->cam.dir_x + g->cam.plane_x * camera_x;
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// double ray_dir_y = g->cam.dir_y + g->cam.plane_y * camera_x;
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// int map_x = (int)g->cam.pos_x;
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// int map_y = (int)g->cam.pos_y;
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// double delta_dist_x = (ray_dir_x == 0) ? 1e30 : fabs(1.0 / ray_dir_x);
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// double delta_dist_y = (ray_dir_y == 0) ? 1e30 : fabs(1.0 / ray_dir_y);
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// int step_x, step_y;
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// double side_dist_x, side_dist_y;
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// if (ray_dir_x < 0)
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// {
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// step_x = -1;
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// side_dist_x = (g->cam.pos_x - map_x) * delta_dist_x;
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// }
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// else
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// {
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// step_x = 1;
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// side_dist_x = (map_x + 1.0 - g->cam.pos_x) * delta_dist_x;
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// }
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// if (ray_dir_y < 0)
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// {
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// step_y = -1;
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// side_dist_y = (g->cam.pos_y - map_y) * delta_dist_y;
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// }
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// else
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// {
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// step_y = 1;
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// side_dist_y = (map_y + 1.0 - g->cam.pos_y) * delta_dist_y;
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// }
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// int hit = 0;
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// int side = 0; /* 0:x, 1:y */
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// while (!hit)
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// {
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// if (side_dist_x < side_dist_y)
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// {
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// side_dist_x += delta_dist_x;
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// map_x += step_x;
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// side = 0;
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// }
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// else
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// {
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// side_dist_y += delta_dist_y;
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// map_y += step_y;
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// side = 1;
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// }
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// if (map_x < 0 || map_y < 0 || map_x >= g->world.w || map_y >= g->world.h
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// || g->world.grid[map_y][map_x] == '1')
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// hit = 1;
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// }
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// double perp_wall_dist;
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// if (side == 0)
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// perp_wall_dist = (side_dist_x - delta_dist_x);
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// else
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// perp_wall_dist = (side_dist_y - delta_dist_y);
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// int line_h = (int)(g->gfx.h / (perp_wall_dist > 1e-6 ? perp_wall_dist : 1e-6));
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// int draw_start = -line_h / 2 + g->gfx.h / 2;
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// int draw_end = line_h / 2 + g->gfx.h / 2;
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// /* Couleur: simple code NSEW selon step & side */
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// int color_idx;
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// if (side == 0)
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// color_idx = (step_x < 0) ? 2 /* E */ : 3 /* W */;
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// else
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// color_idx = (step_y < 0) ? 1 /* S */ : 0 /* N */;
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// int color = g->colors.wall_nsew[color_idx];
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// if (side == 1) color = (color & 0xFEFEFE) >> 1; /* ombre simple */
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// draw_vline(g, x, draw_start, draw_end, color);
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// }
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// }
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/* 2eme test de la meme focntion (pas encore choisi laquelle)*/
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// void raycast_frame(t_game *g)
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// {
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// for (int x = 0; x < g->gfx.w; x++)
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// {
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// double camera_x = 2.0 * x / (double)g->gfx.w - 1.0;
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// double ray_dir_x = g->cam.dir_x + g->cam.plane_x * camera_x;
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// double ray_dir_y = g->cam.dir_y + g->cam.plane_y * camera_x;
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// int map_x = (int)g->cam.pos_x;
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// int map_y = (int)g->cam.pos_y;
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// double delta_dist_x = (ray_dir_x == 0) ? 1e30 : fabs(1.0 / ray_dir_x);
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// double delta_dist_y = (ray_dir_y == 0) ? 1e30 : fabs(1.0 / ray_dir_y);
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// int step_x, step_y;
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// double side_dist_x, side_dist_y;
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// if (ray_dir_x < 0) { step_x = -1; side_dist_x = (g->cam.pos_x - map_x) * delta_dist_x; }
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// else { step_x = 1; side_dist_x = (map_x + 1.0 - g->cam.pos_x) * delta_dist_x; }
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// if (ray_dir_y < 0) { step_y = -1; side_dist_y = (g->cam.pos_y - map_y) * delta_dist_y; }
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// else { step_y = 1; side_dist_y = (map_y + 1.0 - g->cam.pos_y) * delta_dist_y; }
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// int hit = 0, side = 0;
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// while (!hit)
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// {
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// if (side_dist_x < side_dist_y) { side_dist_x += delta_dist_x; map_x += step_x; side = 0; }
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// else { side_dist_y += delta_dist_y; map_y += step_y; side = 1; }
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// if (map_x < 0 || map_y < 0 || map_x >= g->world.w || map_y >= g->world.h
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// || g->world.grid[map_y][map_x] == '1')
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// hit = 1;
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// }
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// double perp_wall_dist = (side == 0) ? (side_dist_x - delta_dist_x) : (side_dist_y - delta_dist_y);
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// if (perp_wall_dist < 1e-6) perp_wall_dist = 1e-6;
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// int line_h = (int)(g->gfx.h / perp_wall_dist);
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// int draw_start = -line_h / 2 + g->gfx.h / 2;
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// int draw_end = line_h / 2 + g->gfx.h / 2;
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// int color_idx;
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// if (side == 0) color_idx = (step_x < 0) ? 2 /* E */ : 3 /* W */;
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// else color_idx = (step_y < 0) ? 1 /* S */ : 0 /* N */;
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// int color = g->colors.wall_nsew[color_idx];
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// if (side == 1) color = (color & 0xFEFEFE) >> 1; /* ombre simple */
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// draw_vline(g, x, draw_start, draw_end, color); /* impl. dans draw.c */
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// }
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// }
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/* Version 3: textures */
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void raycast_frame(t_game *g)
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{
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const double EPS = 1e-6;
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for (int x = 0; x < g->gfx.w; x++)
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{
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double camera_x = 2.0 * x / (double)g->gfx.w - 1.0;
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double ray_dir_x = g->cam.dir_x + g->cam.plane_x * camera_x;
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double ray_dir_y = g->cam.dir_y + g->cam.plane_y * camera_x;
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int map_x = (int)g->cam.pos_x;
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int map_y = (int)g->cam.pos_y;
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double delta_dist_x = (ray_dir_x == 0) ? 1e30 : fabs(1.0 / ray_dir_x);
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double delta_dist_y = (ray_dir_y == 0) ? 1e30 : fabs(1.0 / ray_dir_y);
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int step_x, step_y;
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double side_dist_x, side_dist_y;
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if (ray_dir_x < 0) { step_x = -1; side_dist_x = (g->cam.pos_x - map_x) * delta_dist_x; }
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else { step_x = 1; side_dist_x = (map_x + 1.0 - g->cam.pos_x) * delta_dist_x; }
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if (ray_dir_y < 0) { step_y = -1; side_dist_y = (g->cam.pos_y - map_y) * delta_dist_y; }
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else { step_y = 1; side_dist_y = (map_y + 1.0 - g->cam.pos_y) * delta_dist_y; }
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int hit = 0, side = 0;
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while (!hit)
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{
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if (side_dist_x < side_dist_y) { side_dist_x += delta_dist_x; map_x += step_x; side = 0; }
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else { side_dist_y += delta_dist_y; map_y += step_y; side = 1; }
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if (map_x < 0 || map_y < 0 || map_x >= g->world.w || map_y >= g->world.h
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|| g->world.grid[map_y][map_x] == '1')
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hit = 1;
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}
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double perp_wall_dist = (side == 0) ? (side_dist_x - delta_dist_x) : (side_dist_y - delta_dist_y);
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if (perp_wall_dist < EPS) perp_wall_dist = EPS;
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int line_h = (int)(g->gfx.h / perp_wall_dist);
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int draw_start = -line_h / 2 + g->gfx.h / 2;
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int draw_end = line_h / 2 + g->gfx.h / 2;
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/* Choix de texture 0:N 1:S 2:E 3:W (même logique que couleurs) */
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int tex_id;
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if (side == 0) tex_id = (step_x < 0) ? 2 /* E */ : 3 /* W */;
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else tex_id = (step_y < 0) ? 1 /* S */ : 0 /* N */;
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if (!g->has_tex)
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{
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int color = g->colors.wall_nsew[tex_id];
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if (side == 1) color = (color & 0xFEFEFE) >> 1;
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draw_vline(g, x, draw_start, draw_end, color);
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continue;
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}
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/* --- TEXTURE MAPPING --- */
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t_tex *t = &g->tex[tex_id];
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/* Position exacte du hit sur le mur (0..1) */
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double wall_x;
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if (side == 0)
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wall_x = g->cam.pos_y + perp_wall_dist * ray_dir_y;
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else
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wall_x = g->cam.pos_x + perp_wall_dist * ray_dir_x;
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wall_x -= floor(wall_x);
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/* Coordonnée X dans la texture */
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int tex_x = (int)(wall_x * (double)t->w);
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if (side == 0 && ray_dir_x > 0) tex_x = t->w - tex_x - 1;
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if (side == 1 && ray_dir_y < 0) tex_x = t->w - tex_x - 1;
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/* Échantillonnage vertical */
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double step = (double)t->h / (double)line_h;
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double tex_pos = (draw_start - g->gfx.h / 2 + line_h / 2) * step;
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/* Ombre légère sur faces Y (optionnel) */
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draw_tex_vline(g, x, draw_start, draw_end, t, tex_x, step, tex_pos);
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if (side == 1) {
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/* sombrement simple: on pourrait parcourir y et foncer; plus simple: rien faire
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pour rester portable / endianness-safe. */
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}
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}
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}
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