public static void game_tilt_init(game_tilt tilt)
{
tilt.x[0] = 1.0f;
tilt.x[1] = 0.0f;
tilt.x[2] = 0.0f;
tilt.rx = 0.0f;
tilt.z[0] = 0.0f;
tilt.z[1] = 0.0f;
tilt.z[2] = 1.0f;
tilt.rz = 0.0f;
}
public static void game_tilt_grav(float[] h,
float[] g,
game_tilt tilt)
{
float[] X = new float[16];
float[] Z = new float[16];
float[] M = new float[16];
/* Compute the gravity vector from the given world rotations. */
Vec3.m_rot(Z, tilt.z, MathHelper.DegreesToRadians(tilt.rz));
Vec3.m_rot(X, tilt.x, MathHelper.DegreesToRadians(tilt.rx));
Vec3.m_mult(M, Z, X);
Vec3.m_vxfm(h, M, g);
}
/*
* Compute appropriate tilt axes from the view basis.
*/
public static void game_tilt_axes(game_tilt tilt, float[][] view_e)
{
float[] Y = new float[3] {
0.0f, 1.0f, 0.0f
};
Vec3.v_cpy(tilt.x, view_e[0]);
Vec3.v_cpy(tilt.z, view_e[2]);
/* Handle possible top-down view. */
if (System.Math.Abs(Vec3.v_dot(view_e[1], Y)) < System.Math.Abs(Vec3.v_dot(view_e[2], Y)))
{
Vec3.v_inv(tilt.z, view_e[1]);
}
}