2 files changed, 50 insertions, 1 deletions

diff --git a/inc/cub3d_structs.h b/inc/cub3d_structs.h
index aff5663..a516036 100644
--- a/inc/cub3d_structs.h
+++ b/inc/cub3d_structs.h
@@ -143,6 +143,11 @@ typedef struct			s_ray
 	float				x_f_ray_dir_bis;
 	float				y_f_ray_dir_bis;
 	uint16_t			p;
+	float				row_dist;
+	float				x_floor;
+	float				y_floor;
+	int32_t				x_cell;
+	int32_t				y_cell;
 }						t_ray;
 
 typedef struct			s_map
@@ -173,6 +178,8 @@ typedef struct			s_map
 	uint8_t				scale;
 	uint32_t			nlx;
 	uint32_t			nly;
+	float				x_floor_step;
+	float				y_floor_step;
 }						t_map;
 
 typedef struct			s_cub
diff --git a/src/ft_floor_cast.c b/src/ft_floor_cast.c
index 1d98e03..9b8ab59 100644
--- a/src/ft_floor_cast.c
+++ b/src/ft_floor_cast.c
@@ -13,10 +13,40 @@
 #include <cub3d.h>
 #include <stdint.h>
 
+static void
+	ft_put_floor_tex(uint16_t y, uint16_t x, t_cub *cl)
+{
+	cl->img.ptr[x * 4 + (cl->img.sizeline * y)] =
+		(uint8_t)cl->tlist[6].ptr[cl->tlist[6].tex_x * 4 + 4 *
+		cl->tlist[6].img_h * cl->tlist[6].tex_y];
+	cl->img.ptr[x * 4 + (cl->img.sizeline * y) + 1] =
+		(uint8_t)cl->tlist[6].ptr[cl->tlist[6].tex_x * 4 + 4 *
+		cl->tlist[6].img_h * cl->tlist[6].tex_y + 1];
+	cl->img.ptr[x * 4 + (cl->img.sizeline * y) + 2] =
+		(uint8_t)cl->tlist[6].ptr[cl->tlist[6].tex_x * 4 + 4 *
+		cl->tlist[6].img_h * cl->tlist[6].tex_y + 2];
+	cl->img.ptr[x * 4 + cl->wlist.x_size * y + 3] = (char)0;
+}
+
+static void
+	ft_floor_cast_loop(uint16_t y, uint16_t x, t_ray *rl, t_cub *cl)
+{
+	rl->x_cell = (int32_t)(rl->x_floor);
+	rl->y_cell = (int32_t)(rl->y_floor);
+	cl->tlist[6].tex_x = (int32_t)(cl->tlist[6].img_w
+			* (rl->x_floor - rl->x_cell)) & (cl->tlist[6].img_w - 1);
+	cl->tlist[6].tex_y = (int32_t)(cl->tlist[6].img_h
+			* (rl->y_floor - rl->y_cell)) & (cl->tlist[6].img_h - 1);
+	rl->x_floor += cl->mlist.x_floor_step;
+	rl->y_floor += cl->mlist.y_floor_step;
+	ft_put_floor_tex(y, x, cl);
+}
+
 void
 	ft_floor_cast(uint16_t y, t_cub *cl)
 {
-	t_ray	*rl;
+	t_ray		*rl;
+	uint16_t	x;
 
 	rl = &cl->rlist;
 	rl->x_f_ray_dir = cl->plist.dir_x - cl->plist.plane_x;
@@ -25,4 +55,16 @@ void
 	rl->y_f_ray_dir_bis = cl->plist.dir_y + cl->plist.plane_y;
 	rl->p = y - cl->wlist.y_size / 2;
 	cl->plist.pos_z = 0.5 * cl->wlist.y_size;
+	rl->row_dist = cl->plist.pos_z / rl->p;
+	cl->mlist.x_floor_step = rl->row_dist *
+		(rl->x_f_ray_dir_bis - rl->x_f_ray_dir) / cl->wlist.x_size;
+	cl->mlist.y_floor_step = rl->row_dist *
+		(rl->y_f_ray_dir_bis - rl->y_f_ray_dir) / cl->wlist.x_size;
+	rl->x_floor = cl->plist.pos_x + rl->row_dist * rl->x_f_ray_dir;
+	rl->y_floor = cl->plist.pos_y + rl->row_dist * rl->y_f_ray_dir;
+	x = 0;
+	while (++x < cl->wlist.x_size)
+	{
+		ft_floor_cast_loop(y, x, rl, cl);
+	}
 }