31 lines
588 B
C
31 lines
588 B
C
#include <c3d/maths.h>
|
|
|
|
void Mtx_RotateY(C3D_Mtx* mtx, float angle, bool bRightSide)
|
|
{
|
|
float a, b;
|
|
float cosAngle = cosf(angle);
|
|
float sinAngle = sinf(angle);
|
|
size_t i;
|
|
|
|
if (bRightSide)
|
|
{
|
|
for (i = 0; i < 4; ++i)
|
|
{
|
|
a = mtx->r[i].x*cosAngle - mtx->r[i].z*sinAngle;
|
|
b = mtx->r[i].z*cosAngle + mtx->r[i].x*sinAngle;
|
|
mtx->r[i].x = a;
|
|
mtx->r[i].z = b;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (i = 0; i < 4; ++i)
|
|
{
|
|
a = mtx->r[0].c[i]*cosAngle + mtx->r[2].c[i]*sinAngle;
|
|
b = mtx->r[2].c[i]*cosAngle - mtx->r[0].c[i]*sinAngle;
|
|
mtx->r[0].c[i] = a;
|
|
mtx->r[2].c[i] = b;
|
|
}
|
|
}
|
|
}
|