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30 lines
588 B
C
30 lines
588 B
C
#include <c3d/maths.h>
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void Mtx_RotateZ(C3D_Mtx* mtx, float angle, bool bRightSide)
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{
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float a, b;
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float cosAngle = cosf(angle);
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float sinAngle = sinf(angle);
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size_t i;
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if (bRightSide)
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{
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for (i = 0; i < 4; ++i)
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{
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a = mtx->r[i].x*cosAngle + mtx->r[i].y*sinAngle;
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b = mtx->r[i].y*cosAngle - mtx->r[i].x*sinAngle;
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mtx->r[i].x = a;
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mtx->r[i].y = b;
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}
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}
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else
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{
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for (i = 0; i < 4; ++i)
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{
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a = mtx->r[0].c[i]*cosAngle - mtx->r[1].c[i]*sinAngle;
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b = mtx->r[1].c[i]*cosAngle + mtx->r[0].c[i]*sinAngle;
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mtx->r[0].c[i] = a;
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mtx->r[1].c[i] = b;
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}
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}
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}
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