IN_ATTACK 攻击1
IN_JUMP 跳跃
IN_DUCK 蹲伏
IN_FORWARD 前进
IN_BACK 后退
IN_USE 互动
IN_CANCEL 取消
IN_LEFT 左转
IN_RIGHT 右转
IN_MOVELEFT 左平移
IN_MOVERIGHT 右平移
IN_ATTACK2 攻击2（副攻击键）
IN_RUN 奔跑（默认shift）
IN_RELOAD 换弹
IN_ZOOM 瞄准镜（l4d2中为中键）

摘选自sm api
Unclassified
#define IN_ATTACK(1 << 0)
#define IN_JUMP(1 << 1)
#define IN_DUCK(1 << 2)
#define IN_FORWARD(1 << 3)
#define IN_BACK(1 << 4)
#define IN_USE(1 << 5)
#define IN_CANCEL(1 << 6)
#define IN_LEFT(1 << 7)
#define IN_RIGHT(1 << 8)
#define IN_MOVELEFT(1 << 9)
#define IN_MOVERIGHT(1 << 10)
#define IN_ATTACK2(1 << 11)
#define IN_RUN(1 << 12)
#define IN_RELOAD(1 << 13)
#define IN_ALT1(1 << 14)
#define IN_ALT2(1 << 15)
#define IN_SCORE(1 << 16) /**< Used by client.dll for when scoreboard is held down */
#define IN_SPEED(1 << 17)/**< Player is holding the speed key */
#define IN_WALK(1 << 18)/**< Player holding walk key */
#define IN_ZOOM(1 << 19)/**< Zoom key for HUD zoom */
#define IN_WEAPON1(1 << 20)/**< weapon defines these bits */
#define IN_WEAPON2(1 << 21)/**< weapon defines these bits */
#define IN_BULLRUSH(1 << 22)
#define IN_GRENADE1(1 << 23)/**< grenade 1 */
#define IN_GRENADE2(1 << 24)/**< grenade 2 */
#define IN_ATTACK3(1 << 25)
#defineFL_ONGROUND(1 << 0)/**< At rest / on the ground */
#define FL_DUCKING(1 << 1)/**< Player flag -- Player is fully crouched */
#defineFL_WATERJUMP(1 << 2)/**< player jumping out of water */
#define FL_ONTRAIN(1 << 3)/**< Player is _controlling_ a train, so movement commands should be ignored on client during prediction. */
#define FL_INRAIN(1 << 4)/**< Indicates the entity is standing in rain */
#define FL_FROZEN(1 << 5)/**< Player is frozen for 3rd person camera */
#define FL_ATCONTROLS(1 << 6)/**< Player can't move, but keeps key inputs for controlling another entity */
#defineFL_CLIENT(1 << 7)/**< Is a player */
#define FL_FAKECLIENT(1 << 8)/**< Fake client, simulated server side; don't send network messages to them */
#define PLAYER_FLAG_BITS9
#defineFL_INWATER(1 << 9)/**< In water */
#defineFL_FLY(1 << 10)/**< Changes the SV_Movestep() behavior to not need to be on ground */
#defineFL_SWIM(1 << 11)/**< Changes the SV_Movestep() behavior to not need to be on ground (but stay in water) */
#defineFL_CONVEYOR(1 << 12)
#defineFL_NPC(1 << 13)
#defineFL_GODMODE(1 << 14)
#defineFL_NOTARGET(1 << 15)
#defineFL_AIMTARGET(1 << 16)/**< set if the crosshair needs to aim onto the entity */
#defineFL_PARTIALGROUND(1 << 17)/**< not all corners are valid */
#define FL_STATICPROP(1 << 18)/**< Eetsa static prop! */
#define FL_GRAPHED(1 << 19)/**< worldgraph has this ent listed as something that blocks a connection */
#define FL_GRENADE(1 << 20)
#define FL_STEPMOVEMENT(1 << 21)/**< Changes the SV_Movestep() behavior to not do any processing */
#define FL_DONTTOUCH(1 << 22)/**< Doesn't generate touch functions, generates Untouch() for anything it was touching when this flag was set */
#define FL_BASEVELOCITY(1 << 23)/**< Base velocity has been applied this frame (used to convert base velocity into momentum) */
#define FL_WORLDBRUSH(1 << 24)/**< Not moveable/removeable brush entity (really part of the world, but represented as an entity for transparency or something) */
#define FL_OBJECT(1 << 25)/**< Terrible name. This is an object that NPCs should see. Missiles, for example. */
#define FL_KILLME(1 << 26)/**< This entity is marked for death -- will be freed by game DLL */
#define FL_ONFIRE(1 << 27)/**< You know... */
#define FL_DISSOLVING(1 << 28)/**< We're dissolving! */
#define FL_TRANSRAGDOLL(1 << 29)/**< In the process of turning into a client side ragdoll. */
#define FL_UNBLOCKABLE_BY_PLAYER(1 << 30)/**< pusher that can't be blocked by the player */
#define FL_FREEZING(1 << 31)/**< We're becoming frozen! */
#define FL_EP2V_UNKNOWN1(1 << 31)/**< Unknown */