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affine rotation

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This commit is contained in:
Recep Aslantas
2016-10-03 16:29:48 +03:00
parent 5a24b9fcd5
commit 846c4d3c73
1 changed files with 36 additions and 0 deletions
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36
include/cglm-affine.h
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@@ -252,4 +252,40 @@ glm_rotate_make(mat4 m, float angle, vec3 axis) {
glm_rotate_ndc_make(m, angle, axis_ndc); glm_rotate_ndc_make(m, angle, axis_ndc);
} }
CGLM_INLINE
void
glm_rotate_ndc(mat4 m, float angle, vec3 axis_ndc) {
mat4 rot;
vec4 v1, v2, v3;
glm_rotate_ndc_make(rot, angle, axis_ndc);
glm_vec4_scale(m[0], rot[0][0], v1);
glm_vec4_scale(m[1], rot[0][1], v2);
glm_vec4_scale(m[2], rot[0][2], v3);
glm_vec4_add(v1, v2, m[0]);
glm_vec4_add(v3, m[0], m[0]);
glm_vec4_scale(m[0], rot[1][0], v1);
glm_vec4_scale(m[1], rot[1][1], v2);
glm_vec4_scale(m[2], rot[1][2], v3);
glm_vec4_add(v1, v2, m[1]);
glm_vec4_add(v3, m[1], m[1]);
glm_vec4_scale(m[0], rot[2][0], v1);
glm_vec4_scale(m[1], rot[2][1], v2);
glm_vec4_scale(m[2], rot[2][2], v3);
glm_vec4_add(v1, v2, m[2]);
glm_vec4_add(v3, m[2], m[2]);
}
CGLM_INLINE
void
glm_rotate(mat4 m, float angle, vec3 axis) {
vec3 axis_ndc;
glm_vec_normalize_to(axis, axis_ndc);
glm_rotate_ndc(m, angle, axis_ndc);
}
#endif /* cglm_affine_h */ #endif /* cglm_affine_h */