相机的旋转方向在一段时间后反转

>我正在尝试创建迷你应用程序，该应用程序通过鼠标移动围绕立方体旋转相机。它在绕 Y 轴旋转时完美运行，但我在绕 X 轴旋转时遇到了问题。当我不断向上移动鼠标时，立方体开始沿正 X 方向旋转。一段时间后，它反转旋转方向并开始在负 X 方向上旋转，然后在一段时间后，再次在正 X 方向上旋转。我想让它围绕正 X 旋转，只要我向上移动鼠标。这里有什么问题？

立方体位于坐标系的中心。投影是透视：

编辑：这是与问题相关的视频：https://youtu.be/997ZdUM8fcQ

vec4 eye;
vec4 at;
vec4 up;
GLfloat mouseX = -1;
GLfloat mouseY = -1;
// Bound to glutPassiveMotionFunc
void mouse(int x, int y) {
// This rotation works perfect, cube rotates on same direction continuously as far as I move the mouse left or right 
GLfloat acceleration_x = mouseX - x;
eye = RotateY(acceleration_x / 10.f) * eye;
mouseX = x;

// This rotation doesn't work properly, after some time, cube's rotation direction inverses
GLfloat acceleration_y = mouseY - y;
eye = RotateX(acceleration_y / 10.f) * eye;
mouseY = y;

// This part teleports pointer to opposite side of window after reaching window bounds
if (x >= 1364) {
glutWarpPointer(1, y);
mouseX = 1;
} 
else if (x <= 0) {
glutWarpPointer(1363, y);
mouseX = 1363;
}
if (y >= 751) {
glutWarpPointer(x, 3);
mouseY = 3;
}
else if (y <= 2) {
glutWarpPointer(x, 750);
mouseY = 750;
}
}

void display( void )
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
vec4   up( 0.0, 1.0, 0.0, 0.0 );
mat4 model_view = LookAt( eye, at, up );
glUniformMatrix4fv( ModelView, 1, GL_TRUE, model_view );
glDrawArrays( GL_TRIANGLES, 0, NumVertices );
glutSwapBuffers();
}
// Bound to glutTimerFunc
void timer( int id )
{    
glutPostRedisplay();
glutTimerFunc(1000.f/60.f, timer, 0);
}
int main( int argc, char **argv )
{
......
......
eye = vec4(0, 0, 2, 0);
at = vec4(0, 0, 0, 0);
up = vec4(0.0, 1.0, 0.0, 0.0);
.....
.....
}