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improve rotate_ndc

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This commit is contained in:
Recep Aslantas
2016-10-30 17:16:01 +02:00
parent 9bf045e026
commit 28554042d6
1 changed files with 18 additions and 29 deletions
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47
include/cglm-affine.h
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@@ -205,43 +205,32 @@ void
glm_rotate_ndc_make(mat4 m, float angle, vec3 axis_ndc) {
/* https://www.opengl.org/sdk/docs/man2/xhtml/glRotate.xml */
float c, s, x1c, y1c, z1c, t;
#define x axis_ndc[0]
#define y axis_ndc[1]
#define z axis_ndc[2]
vec3 v, vs;
float c;
c = cosf(angle);
s = sinf(angle);
t = 1 - c;
x1c = t * x;
y1c = t * y;
z1c = t * z;
glm_vec_scale(axis_ndc, 1.0f - c, v);
glm_vec_scale(axis_ndc, sinf(angle), vs);
m[0][0] = x1c * x + c;
m[0][1] = x1c * y + z * s;
m[0][2] = x1c * z - y * s;
m[0][3] = 0.0f;
glm_vec_scale(axis_ndc, v[0], m[0]);
glm_vec_scale(axis_ndc, v[1], m[1]);
glm_vec_scale(axis_ndc, v[1], m[2]);
m[1][0] = y1c * x - z * s;
m[1][1] = y1c * y + c;
m[1][2] = y1c * z + x * s;
m[1][3] = 0.0f;
m[0][0] += c;
m[0][1] += vs[2];
m[0][2] -= vs[1];
m[2][0] = z1c * x + y * s;
m[2][1] = z1c * y - x * s;
m[2][2] = z1c * z + c;
m[2][3] = 0.0f;
m[1][0] -= vs[2];
m[1][1] += c;
m[1][2] += vs[0];
m[3][0] = 0.0f;
m[3][1] = 0.0f;
m[3][2] = 0.0f;
m[2][0] += vs[1];
m[2][1] -= vs[0];
m[2][2] += c;
m[0][3] = m[1][3] = m[2][3] = m[3][0] = m[3][1] = m[3][2] = 0.0f;
m[3][3] = 1.0f;
#undef x
#undef y
#undef z
}
CGLM_INLINE