Added model center translation

1 files changed, 52 insertions, 0 deletions

diff --git a/src/center.c b/src/center.c
new file mode 100644
index 0000000..b15811d
--- /dev/null
+++ b/src/center.c
@@ -0,0 +1,52 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   center.c                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: charles <charles.cabergs@gmail.com>        +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/05/13 10:48:15 by charles           #+#    #+#             */
+/*   Updated: 2020/05/13 11:32:45 by charles          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "scop.h"
+
+void	st_find_boundary(float *vertices, size_t vertices_len, t_ftmvec3 *min, t_ftmvec3 *max)
+{
+	size_t	i;
+
+	ftm_vec3init(min, INFINITY, INFINITY, INFINITY);
+	ftm_vec3init(max, -INFINITY, -INFINITY, -INFINITY);
+	i = 0;
+	while (i < vertices_len)
+	{
+		if (vertices[i] > max->x)
+			max->x = vertices[i];
+		if (vertices[i] < min->x)
+			min->x = vertices[i];
+		i++;
+		if (vertices[i] > max->y)
+			max->y = vertices[i];
+		if (vertices[i] < min->y)
+			min->y = vertices[i];
+		i++;
+		if (vertices[i] > max->z)
+			max->z = vertices[i];
+		if (vertices[i] < min->z)
+			min->z = vertices[i];
+		i += 2;
+	}
+}
+
+void	center_mat4_init_translate(t_ftmmat4 *dst, float *vertices, size_t vertices_len)
+{
+	t_ftmvec3	min;
+	t_ftmvec3	max;
+
+	st_find_boundary(vertices, vertices_len, &min, &max);
+	ftm_mat4init_eye(dst, 1.0);
+	ftm_mat4translate(dst, -(max.x + min.x) / 2.0f,
+							-(max.y + min.y) / 2.0f,
+							-(max.z + min.z) / 2.0f);
+}