mirror of
https://github.com/blawar/GLideN64.git
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45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
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#include <math.h>
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#include "3DMath.h"
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void MultMatrix(float m0[4][4], float m1[4][4], float dest[4][4])
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{
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int i;
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for (i = 0; i < 4; i++)
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{
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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];
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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];
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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];
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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];
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}
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}
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void MultMatrix2(float m0[4][4], float m1[4][4])
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{
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float dst[4][4];
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MultMatrix(m0, m1, dst);
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memcpy( m0, dst, sizeof(float) * 16 );
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}
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void TransformVectorNormalize(float vec[3], float mtx[4][4])
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{
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float len;
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vec[0] = mtx[0][0] * vec[0]
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+ mtx[1][0] * vec[1]
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+ mtx[2][0] * vec[2];
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vec[1] = mtx[0][1] * vec[0]
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+ mtx[1][1] * vec[1]
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+ mtx[2][1] * vec[2];
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vec[2] = mtx[0][2] * vec[0]
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+ mtx[1][2] * vec[1]
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+ mtx[2][2] * vec[2];
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len = vec[0]*vec[0] + vec[1]*vec[1] + vec[2]*vec[2];
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if (len != 0.0)
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{
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len = sqrtf(len);
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vec[0] /= len;
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vec[1] /= len;
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vec[2] /= len;
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}
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}
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