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1 | #include <math.h> |
2 | |
3 | static void MultMatrix_default( float m0[4][4], float m1[4][4], |
4 | float dest[4][4]) |
5 | { |
6 | int i; |
7 | for (i = 0; i < 4; i++) |
8 | { |
9 | dest[0][i] = m0[0][i]*m1[0][0] + m0[1][i]*m1[0][1] + m0[2][i]*m1[0][2] + m0[3][i]*m1[0][3]; |
10 | dest[1][i] = m0[0][i]*m1[1][0] + m0[1][i]*m1[1][1] + m0[2][i]*m1[1][2] + m0[3][i]*m1[1][3]; |
11 | dest[2][i] = m0[0][i]*m1[2][0] + m0[1][i]*m1[2][1] + m0[2][i]*m1[2][2] + m0[3][i]*m1[2][3]; |
12 | dest[3][i] = m0[3][i]*m1[3][3] + m0[2][i]*m1[3][2] + m0[1][i]*m1[3][1] + m0[0][i]*m1[3][0]; |
13 | } |
14 | } |
15 | |
16 | static void TransformVectorNormalize_default(float vec[3], float mtx[4][4]) |
17 | { |
18 | float len; |
19 | |
20 | vec[0] = mtx[0][0] * vec[0] |
21 | + mtx[1][0] * vec[1] |
22 | + mtx[2][0] * vec[2]; |
23 | vec[1] = mtx[0][1] * vec[0] |
24 | + mtx[1][1] * vec[1] |
25 | + mtx[2][1] * vec[2]; |
26 | vec[2] = mtx[0][2] * vec[0] |
27 | + mtx[1][2] * vec[1] |
28 | + mtx[2][2] * vec[2]; |
29 | len = vec[0]*vec[0] + vec[1]*vec[1] + vec[2]*vec[2]; |
30 | if (len != 0.0) |
31 | { |
32 | len = sqrtf(len); |
33 | vec[0] /= len; |
34 | vec[1] /= len; |
35 | vec[2] /= len; |
36 | } |
37 | } |
38 | |
39 | static void Normalize_default(float v[3]) |
40 | { |
41 | float len; |
42 | |
43 | len = (float)(v[0]*v[0] + v[1]*v[1] + v[2]*v[2]); |
44 | if (len != 0.0) |
45 | { |
46 | len = (float)sqrt( len ); |
47 | v[0] /= (float)len; |
48 | v[1] /= (float)len; |
49 | v[2] /= (float)len; |
50 | } |
51 | } |
52 | |
53 | static float DotProduct_default( float v0[3], float v1[3] ) |
54 | { |
55 | float dot; |
56 | dot = v0[0]*v1[0] + v0[1]*v1[1] + v0[2]*v1[2]; |
57 | return dot; |
58 | } |
59 | |
60 | |
61 | void (*MultMatrix)(float m0[4][4], float m1[4][4], float dest[4][4]) = |
62 | MultMatrix_default; |
63 | void (*TransformVectorNormalize)(float vec[3], float mtx[4][4]) = |
64 | TransformVectorNormalize_default; |
65 | void (*Normalize)(float v[3]) = Normalize_default; |
66 | float (*DotProduct)(float v0[3], float v1[3]) = DotProduct_default; |
67 | |