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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ftm_mat4init_frustum.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/05/12 15:37:26 by charles #+# #+# */
/* Updated: 2020/05/12 17:29:53 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "libftm_mat4.h"
t_ftmmat4 *ftm_mat4init_frustum(t_ftmmat4 *mat4, t_ftmfrustum *frustum)
{
ftm_mat4init_fill(mat4, 0.0);
ftm_mat4set(mat4, 0, 0, (2.0 * frustum->near) / (frustum->right - frustum->left));
ftm_mat4set(mat4, 1, 1, (2.0 * frustum->near) / (frustum->top - frustum->bottom));
ftm_mat4set(mat4, 2, 2, (-(frustum->far + frustum->near)) / (frustum->far - frustum->near));
ftm_mat4set(mat4, 0, 2, (frustum->right + frustum->left) / (frustum->right - frustum->left));
ftm_mat4set(mat4, 1, 2, (frustum->top + frustum->bottom) / (frustum->top - frustum->bottom));
ftm_mat4set(mat4, 2, 3, (-2.0 * frustum->far * frustum->near) / (frustum->far - frustum->near));
ftm_mat4set(mat4, 3, 2, -1.0);
return (mat4);
}
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