texture selector, collision detection

1 files changed, 55 insertions, 0 deletions

diff --git a/src/texture.c b/src/texture.c
new file mode 100644
index 0000000..725e0aa
--- /dev/null
+++ b/src/texture.c
@@ -0,0 +1,55 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   texture.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: cacharle <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/02/01 11:38:43 by cacharle          #+#    #+#             */
+/*   Updated: 2020/02/01 12:24:40 by cacharle         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "cub3d.h"
+
+t_image	*texture_select(t_state *state, t_render_state *rstate)
+{
+	if (rstate->side == SIDE_NS)
+	{
+		if (rstate->map_pos.y < state->pos.y)
+			return (state->textures + TEX_NORTH);
+		else
+			return (state->textures + TEX_SOUTH);
+	}
+	else if (rstate->side == SIDE_WE)
+	{
+		if (rstate->map_pos.x > state->pos.x)
+			return (state->textures + TEX_WEST);
+		else
+			return (state->textures + TEX_EAST);
+	}
+	return (NULL);
+}
+
+/*
+** Since we're drawing each column, all the texels we want to draw on the window
+** are on a single column of the texture.
+** First we find the x-coord relative to the wall we hit
+*/
+
+int		texture_x(t_state *state, t_render_state *rstate, t_image *texture)
+{
+	int		tex_x;
+	double	wall_x;
+
+	if (rstate->side == SIDE_WE)
+		wall_x = state->pos.y + rstate->perp_dist * rstate->ray.y;
+	else
+		wall_x = state->pos.x + rstate->perp_dist * rstate->ray.x;
+	wall_x -= floor(wall_x);
+	tex_x = (int)(wall_x * (double)texture->width);
+	if ((rstate->side == SIDE_NS && rstate->ray.x > 0) ||
+			(rstate->side == SIDE_WE && rstate->ray.y < 0))
+		tex_x = texture->width - tex_x - 1;
+	return (tex_x);
+}