Added perspective matrix

1 files changed, 25 insertions, 0 deletions

diff --git a/vendor/libftm/src/mat4/ftm_mat4init_perspective.c b/vendor/libftm/src/mat4/ftm_mat4init_perspective.c
new file mode 100644
index 0000000..f04b39e
--- /dev/null
+++ b/vendor/libftm/src/mat4/ftm_mat4init_perspective.c
@@ -0,0 +1,25 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ftm_mat4init_perspective.c                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: charles <charles.cabergs@gmail.com>        +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/05/12 16:54:49 by charles           #+#    #+#             */
+/*   Updated: 2020/05/12 19:07:45 by charles          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libftm_mat4.h"
+
+t_ftmmat4	*ftm_mat4init_perspective(t_ftmmat4 *mat4, float fov, float aspect_ratio,
+										float near, float far)
+{
+	t_ftmfrustum_sym frustum;
+
+	frustum.near = near;
+	frustum.far = far;
+	frustum.width = 2.0 * (near / tanf(M_PI_2 - (fov / 2.0)));
+	frustum.height = frustum.width / aspect_ratio;
+	return (ftm_mat4init_frustum_sym(mat4, &frustum));
+}