28 lines
803 B
C
28 lines
803 B
C
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#include "camera.h"
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t_matrix4 camera_look_at(const t_camera *const camera) {
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/* from cglm */
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const t_fvec3 f = m_vec_norm(m_vec_sub(camera->pos, camera->target));
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const t_fvec3 r = m_vec_norm(m_vec_cross(f, camera->up));
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const t_fvec3 u = m_vec_cross(f, r);
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t_matrix4 result;
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result.row[0].x = r.x;
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result.row[0].y = u.x;
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result.row[0].z =-f.x;
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result.row[1].x = r.y;
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result.row[1].y = u.y;
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result.row[1].z =-f.y;
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result.row[2].x = r.z;
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result.row[2].y = u.z;
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result.row[2].z =-f.z;
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result.row[3].x =-m_vec_dot(r, camera->pos);
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result.row[3].y =-m_vec_dot(u, camera->pos);
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result.row[3].z = m_vec_dot(f, camera->pos);
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result.row[0].w = result.row[1].w = result.row[2].w = 0.0f;
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result.row[3].w = 1.0f;
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return result;
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}
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