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48 lines
874 B
C
48 lines
874 B
C
/*
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* Copyright (c), Recep Aslantas.
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*
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* MIT License (MIT), http://opensource.org/licenses/MIT
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* Full license can be found in the LICENSE file
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*/
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#ifndef glm_vcam_h
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#define glm_vcam_h
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#include "cglm.h"
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CGLM_INLINE
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void
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glm_lookat(vec3 eye,
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vec3 center,
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vec3 up,
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mat4 dest) {
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vec3 f, u, s;
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glm_vec_sub3(center, eye, f);
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glm_vec_normalize_self(f);
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glm_vec_cross(f, up, s);
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glm_vec_normalize_self(s);
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glm_vec_cross(s, f, u);
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dest[0][0] = s[0];
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dest[1][0] = s[1];
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dest[2][0] = s[2];
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dest[0][1] = u[0];
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dest[1][1] = u[1];
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dest[2][1] = u[2];
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dest[0][2] =-f[0];
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dest[1][2] =-f[1];
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dest[2][2] =-f[2];
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dest[3][0] =-glm_vec_dot(s, eye);
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dest[3][1] =-glm_vec_dot(u, eye);
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dest[3][2] = glm_vec_dot(f, eye);
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dest[0][3] = 0;
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dest[1][3] = 0;
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dest[2][3] = 0;
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dest[3][3] = 1;
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}
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#endif /* glm_vcam_h */
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